Carson City Council
March 17, 2026

INTERAGENCY MEMORANDUM OF UNDERSTANDING

between

Los Angeles County Metropolitan Transportation Authority, in its capacity as the Administrator of the Regional Integration of Intelligent Transportation Systems (“RIITS”), located at 1 Gateway Plaza, Los Angeles, California 90012

and

City of Carson (“Carson”), located at 701 E Carson Street, Carson, CA 90745

This Interagency Memorandum of Understanding (the “Agreement”) between the Los Angeles County Metropolitan Transportation Administration in its capacity as the RIITS Administrator (“Administrator”) and Carson sets forth the obligations and rights of membership in the Configuration Management Committee that oversees RIITS.

Administrator and Carson may be referred to individually as a “Party” and collectively as “Parties”. This is a no cost Agreement. Neither Party shall incur any cost from the other or charge for anything related to this Agreement. This Agreement will be effective on the last date of signatures below (the “Effective Date”).

RECITALS

WHEREAS, on or about April 15, 2004, the State of California, Department of Transportation for District 7 (“Caltrans”), the City of Los Angeles, Department of Transportation (“LADOT”), and the Los Angeles County Metropolitan Transportation Administration ("LACMTA") entered into an interagency memorandum of understanding (the "RIITS MOU") to establish the Regional Integration of Intelligent Transportation Systems (“RIITS”) for the purpose of exchanging infrastructure and operational resources, including, but not limited to, near real time traffic, transit, video, and other data relating to all modes of transportation;

WHEREAS, on or about December 1, 2004, LACMTA, Caltrans, and LADOT entered into Amendment No. 1 to the RIITS MOU to:

• name LACMTA as the Administrator and delegate authority to LACMTA to administer, maintain, operate, manage and monitor RIITS access, codify system changes, process Member, Associate, and User agreements, and enforce the terms and conditions of the processed agreements; and

• establish a Configuration Management Committee (“CM Committee”) to oversee RIITS;

WHEREAS, the CM Committee adopted bylaws (the “Bylaws”) to establish among other things, rules of membership, roles and responsibilities of Members and officers of the CM Committee, and the voting process by which the CM Committee may take action as the governing body of RIITS;

WHEREAS, to participate in RIITS, each Member and/or Associate must first enter into an Interagency Memorandum of Understanding substantially similar to this Agreement and authorize the Administrator to exchange data through RIITS;

WHEREAS, on September 25, 2025, the CMC voted and approved Carson to join the CM Committee as a voting Member on the condition that Carson exchanges Information through RIITS; and

WHEREAS, Carson desires to join the CM Committee as a voting Member and exchange Information through RIITS infrastructure and operational resources;

NOW, THEREFORE, in consideration for the promises set forth herein, the receipt and adequacy of which is hereby acknowledged, the Parties hereto agree as follows:

1. DEFINITIONS

1.1. "Information" means any and all data, records, materials, including specifically but not limited to near or real time traffic, transit, video, and other data relating to all modes of transportation. As defined herein below, a subset of Information is RIITS Data, and a subset of RIITS Data is Transportation Data.

1.2. “Interagency Memorandum of Understanding” means an agreement entered into between Administrator and a public agency setting forth the terms and conditions of the agency’s membership in the CM Committee.

1.3. “Member” or “Members” means any entity that has been approved by the CM Committee to be a voting member of the CM Committee and has entered into an Interagency Memorandum of Understanding.

1.4. “Associate” or “Associates” means any entity that has been approved by the CM Committee to be a non-voting member of the CM Committee and has entered into an Interagency Memorandum of Understanding.

1.5. “Users” means non-members that have access to Transportation Data Members and Associates authorize Administrator to make available.

1.6. “RIITS Data” means Information available through RIITS and any other data that RIITS Administrator makes available under this Agreement during the Term from sources of data supplied through RIITS, including, but not limited to, data provided via Members’ and Associate’s infrastructure and operational resources. Members and Associates may have login access to RIITS Data and access to operational and infrastructure resources that may not be available to Users or the general public.

1.7. “Transportation Data” means a subset of the RIITS Data that the Member which is the source of the Information authorizes to be incorporated into the public facing section of www.riits.net, shared or exchanged with Users, and that may be included in the public facing applications of Members, Associates, and Users.

2. MEMBERSHIP

2.1. Upon execution of this Agreement by both Parties, Carson will become a Member.

2.2. As a Member, Carson agrees to abide by and uphold the Bylaws and jointly with other Members, develop, review, and approve additional Bylaws, guidelines, protocols, terms and conditions, agreements, memorandum of understandings between and for Members, Associates, and Users and/or licensees. To the extent a conflict may arise between this Agreement and the Bylaws, the Bylaws shall govern.

2.3. Carson understands that Information accessed via RIITS is to be used for transportation related system management purposes only. RIITS Data shall only be used to provide general information about transportation and to assist Members and Associates in transportation management operations. RIITS Data shall not be used for any non- transportation related system management purposes, including but not limited to, law enforcement, except law enforcement and emergency management agencies may use the RIITS Data for the purpose of situational awareness, tactical planning, infrastructure protection, or incident response. RIITS Data shall not be recorded in any manner without the prior approval of the source of the RIITS Data.

2.4. Members may exchange Information per this Agreement. Members may choose to add or remove infrastructure and operational resources, including Information exchanged through RIITS by Member’s written notice to Administrator. As a Member, Carson may have access to Information and may use RIITS Data according to this Agreement. Carson acknowledges and agrees that Members and Associates may access and use Information provided by Carson as RIITS Data subject to this Agreement.

2.5. Carson is responsible for the procurement, maintenance, and upgrade of its equipment required for transmitting, receiving, and displaying the RIITS Data.

2.6. Carson may enter into third party contracts on behalf of RIITS to obtain and provide transportation and related data, service, or maintenance agreements for the benefit of Carson and RIITS Members and Associates, with Administrator approval.

3. DISSEMINATION OF THE DATA

3.1. With the approval of the voting Members of the CM Committee and the execution of a written agreement, Transportation Data may be licensed to Users.

3.2. At any time, the source of Information may:

3.2.1. Revoke the authority to use its Transportation Data in public facing applications and the public facing www.riits.net website.

3.2.2. Revoke the authority to license its Transportation Data to Users.

3.2.3. Cause the Administrator to remove from RIITS the RIITS Data it has provided.

3.3. Carson shall prevent any unauthorized use of the RIITS Data by its personnel.

3.4. As between the Administrator and/or any and all Members and/or Associates, on the one side, and the Party providing its Information and access to operational and infrastructure resources, on the other, the Party providing Information and access to operational and infrastructure resources retains ownership and control of said Information and access to operational and infrastructure resources.

4. COMPENSATION
This is a no cost Agreement. Neither Party shall incur any cost from the other or charge for anything related to this Agreement. However, Members may enter into a separate written agreement for the provision of hardware, software, license, training, warranty, service, product, and other work provided by Members and Associates.

5. AMENDMENTS
No amendment, modification, alteration or variation of the terms of this Agreement shall be valid unless made in writing and signed by the Parties hereto.

6. PUBLIC RECORDS ACT

6.1 Each Party understands and agrees that any and all Information is subject to the provisions of the California Public Records Act, California Government Code sections 7920.000, et seq. ("CPRA”) and/or the Federal Freedom of Information Act, Title 5 USC 552 ("FOIA")

6.2 Administrator will not advise as to the nature or content of Information entitled to protection from disclosure under the CPRA or FOIA but will use best efforts to provide the source Party timely notification of any third-party request for disclosure.

6.3 The source Party shall timely (1) notify Administrator in writing whether and to the extent it objects to disclosure of Information and (2) seek the appropriate judicial relief under the CPRA or FOIA.

6.4 If the source Party does not timely notify Administrator of any objection to disclosure and obtain judicial instruction or relief, then Administrator may comply with the request to the extent required by the CPRA or FOIA.

6.5 In the event of any judicial proceeding or action concerning or seeking the disclosure of any Information, the source Party understands and agrees that Administrator's sole involvement will be as a custodial stakeholder to retain the Information until otherwise ordered by a court of competent jurisdiction. The source Party, at its sole expense and risk, shall be responsible for any and all fees for prosecuting or defending any proceeding or action concerning Information, and shall indemnify, defend, and hold Administrator harmless from all liability, including attorney’s fees, costs, and expenses, in connection with any such proceeding or action.

7. CONFIDENTIALITY

7.1. Parties agree that for and during the entire term of the Agreement, all information, except Transportation Data, including, but not limited to data, figures, records, findings and the like received or generated by the Agreement and in the performance of the Agreement, shall be considered and kept private and confidential and shall not be divulged to any person, firm, corporation, or other entity, unless required by the California Public Records Act or any other applicable law.

7.2. Upon termination of the Agreement for any cause, Parties agree that they will continue to treat as private and confidential any information other than Transportation Data, including but not limited to, data, figures, records and the like, and will not release any such information to any person, firm, corporation or other entity, unless required by the California Public Records Act or any other applicable law.

8. REPRESENTATIONS AND WARRANTIES

8.1. Neither Administrator nor any of the Members and Associates, nor any of their respective employees, officers, agents, or consultants makes any warranty, express or implied, with respect to infrastructure and operational resources, sources of data and Information, nor with respect to the accuracy, sufficiency or completeness thereof, nor with respect to any of the software or other systems provided by Administrator or any Member or Associate under this Agreement. RIITS is provided on an “as is” and “with all faults” basis, with Carson using RIITS at its own risk.

8.2. Neither Administrator, Members, nor Associates make any representations or warranties, express or implied, that the RIITS Data will perform on Carson’s equipment. Further, Administrator makes no representations or warranties, express or implied, that RIITS Data will be suitable for the purposes for which it is permitted to be used under the terms of this Agreement. THE IMPLIED WARRANTIES OF

MERCHANTABILITY AND OF FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY EXPRESSLY WAIVED BY THE PARTIES.

8.3. Carson warrants that all work necessary to transmit its Information through RIITS has been completed. In the event of breach of this warranty, Carson shall take the necessary actions to correct the breach and the consequences thereof, at Carson’s sole expense, in the most expeditious manner as permitted by existing circumstances.

Upon notification from Administrator of Carson’s breach, if Carson does not promptly take steps to correct the breach, Administrator may: 1) Correct the breach or cause others to do so upon written consent of Carson. Administrator may require Carson to reimburse Administrator for any work that is completed by Administrator or others to correct the breach; 2) disconnect Carson from RIITS; or 3) terminate this Agreement and Carson’s Membership. The remedies described above are non- exclusive and Administrator’s use of these remedies does not waive any other rights or remedies it may have at law or otherwise.

9. LIMITATION OF LIABILITY

9.1. Except for Indemnity obligations set forth in section 10, neither Carson, Administrator, any Member, or any Associate, or any of their respective employees, officers, agents, or consultants shall be liable for any damages, claim or loss incurred by a Member or Associate (including without limitation, compensatory, incidental, indirect, special, consequential, or exemplary damages, lost profits, lost sales or business, expenditures, investments or commitments in connection with any business, or loss of goodwill) resulting from the RIITS Data or inability to use the provided RIITS Data irrespective of whether Administrator, Carson, Members and/or Associates have been informed of, knew of, or should have known of the likelihood of such damages, claim, or loss.

9.2. Members and Associates assume no liability or responsibility for Carson equipment.

9.3. Carson will not hold any Member or Associate liable or responsible in any way for unforeseen interruptions in providing the RIITS Data regardless of cause.

9.4. Carson, on behalf of itself and its agents, sub-licensees, employees, clients, and customers, hereby waives and releases Administrator and all Members and Associates from any and all liability, including but not limited to claims, causes of action, losses, costs, damages, and expenses of any kind or nature whatsoever, whether known or unknown, to the extent caused by or attributable to RIITS, this Agreement, or the use of RIITS Data by Carson .

Carson (for itself and its clients, customers and employees) expressly waives the benefit of Section 1542 of the California Civil Code, which provides as follows: “a general release does not extend to claims which the creditor does not know or suspect to exist in his or her favor at the time of executing the release, which if known by him or her must have materially affected his or her settlement with the debtor”.

(Carson’s Initials) ______

10. INDEMNIFICATION

10.1. To the fullest extent permitted by law, and with counsel approved by the Administrator, Carson shall defend, indemnify, and hold harmless the Administrator, Members, and Associates, including the respective agents, employees, directors, or officers of each (the “Indemnified Parties”), from and against any and all liability, to the extent arising out of, connected with, or resulting from any act or omission of Carson or any of its officers, authorized representative, employees, subcontractors or suppliers, or any person or organization directly or indirectly employed by any of them, which liability includes but is not limited to claims, actions, suits (including but not limited to workers’ compensation suits and breaches of contract claims made by employees of Carson against Indemnified Parties), demands, costs, judgments, liens, penalties, damages, losses, and/or expenses, including but not limited to any fees of accountants, attorneys or other professionals.

10.2. The indemnification specified in this Section shall survive termination or closeout of the Agreement hereunder and is in addition to any other rights or remedies that Members and Associates may have under the law or under this Agreement.

10.3. Parties acknowledge that all Members and Associates enter into an Interagency Memorandum of Understanding with substantially similar indemnification language under which Carson shall be indemnified as a Member.

10.4. Claims against the indemnified Members and/or Associates by any employee of the Members and/or Associates, its subcontractors, suppliers, anyone directly or indirectly employed by any of them, and/or anyone for whose acts any of them may be liable shall not in any way limit Carson’s indemnification obligation as set forth above, including the Agreement and/or type of damages, compensation, and/or benefits payable by or for Carson or its subcontractors under workers’ compensation acts, disability benefit acts, and/or other employee benefit acts and/or insurances.

11. NO WAIVER

11.1. Failure of Administrator to enforce at any time, or from time to time, any provision of the Agreement shall not be construed as a waiver thereof.

11.2. No waiver by Administrator of any breach of any provision of the Agreement shall constitute a waiver of any other breach or of such provision.

11.3. Failure or delay by Administrator to insist upon strict performance of any terms or conditions of the Agreement, or to exercise any rights or remedies provided by law, shall not be deemed a waiver of any right of Administrator to insist upon performance of Carson's obligations set forth in the Agreement, or rights or remedies as to any prior or subsequent default hereunder.

12. TERM OF THE AGREEMENT

12.1. The term of the Agreement shall begin upon the date of the last Party to sign this Agreement and shall continue for one (1) year (the “Initial Term”).

12.2. The Agreement shall automatically renew month to month (each a “Renewal Term”), unless either Party sends written notice to the other Party at least thirty (30) days before expiration of the Initial Term or any Renewal Term that it does not wish to renew the Agreement.

12.3. The term of the Agreement shall consist of the Initial Term and any Renewal Term (the “Term”).

13. TERMINATION

13.1. If Carson fails to comply with any of the terms and conditions contained within this Agreement, Administrator may revoke Carson’s access privileges to RIITS Data and, upon written notification, terminate this Agreement immediately. In addition, Administrator shall have the right to enforce any and all rights and remedies herein or which may be now or hereafter available at law or in equity.

13.2. Except as provided in the preceding paragraph, CM Committee reserves the right to revoke Carson’s access privileges to RIITS and terminate this Agreement at any time, upon thirty (30) days prior written notice to Carson.

13.3. Carson may terminate this Agreement upon thirty (30) days prior written notice to Administrator.

14. OTHER TERMS AND CONDITIONS

14.1. This Agreement may be executed in counterparts, each of which shall be deemed an original, but all of which taken together shall constitute one and the same instrument.

14.2. Each Member and Associate of the CM Committee is an express third-party beneficiary of this Agreement.

14.3. The persons executing this Agreement on behalf of the Parties shall be duly authorized to execute this Agreement on behalf of its respective Party.

15. ASSIGNMENT
Carson shall not assign, transfer, convey, or otherwise dispose of the Agreement (or the right, title, or interest in it or any part of it) without the prior written consent of the CM Committee and endorsement of the Administrator, which consent shall not be unreasonably withheld.

16. AUTHORITY TO ENTER AGREEMENTS AND MANAGEMENT OF RIITS

16.1. LACMTA as the Administrator is authorized to execute Member, Associate, and User agreements which contain provisions regarding guidelines, protocols, terms and conditions on use of RIITS that have been approved by the CM Committee on behalf of all Members and Associates, including Carson.

16.2. Carson hereby acknowledges that Administrator or any successor Administrator selected by the CM Committee is delegated authority to provide for the day-to-day operation, maintenance, management, and monitoring of RIITS, codify system changes, provide administrative support to the CM Committee, execute related agreements, and enforce the terms and conditions of agreements.

17. GOVERNING LAW
The Agreement has been negotiated, entered into, and shall be performed, within the State of California, and as such California substantive and procedural law shall apply, except to the extent preempted or superseded by federal law. By entering into the Agreement, the Parties consent and submit to the jurisdiction of the courts of the State of California, County of Los Angeles, over any action at law, suit in equity, and/or other proceeding that may arise out of the Agreement.

18. SEVERABILITY
In the event any article, section, sub-article, paragraph, sentence, clause, phrase contained in the Agreement shall be determined, declared, adjudged invalid, illegal, unconstitutional, or otherwise void, such determination, declaration, or adjudication shall in no manner affect the other articles, sections, sub-articles, paragraphs, sentences, clauses, or phrases of the Agreement, which shall remain in full force and effect as if the article, section, sub-article, paragraph, sentence, clause, or phrase declared, determined, or adjudged invalid, illegal, unconstitutional, or otherwise void, was not originally contained in the Agreement.

19. ENTIRE AGREEMENT
This Agreement constitutes the entire understanding between Carson and the Administrator regarding RIITS, and supersedes any and all previous and contemporaneous agreements, whether written or oral, and all communications between the Parties regarding RIITS.

20. BINDING ON SUCCESSORS AND ASSIGNS
This Agreement shall run to the benefit of and be binding upon any successors and assigns.

21. CONTACT INFORMATION
Notices under this Agreement shall be sent by first-class U.S. mail, postage prepaid, to the Carson contact and to the Administrator, at the address specified. Each Party will notify the other in writing of changes to their designated contact person. Notices shall be deemed effective five business days after such mailing.

Contact information regarding any aspects of this Agreement is as follows:

21.1. Carson Contact Information
Carson may provide a primary and a technical contact. Carson contact information is as follows:

21.1.1. Primary Contact Name

Name: City of Carson
Contact Name: Mr. Ian Holst
Title: Associate Civil Engineer
Address: 701 E Carson Street
Carson, CA 90745
Telephone: (310) 847-3539
Email: [email protected]

21.1.2. Technical Contact Name

Name: City of Carson
Contact Name: Mr. Gilbert M. Marquez
Title: City Engineer
Address: 701 E Carson Street
Carson, CA 90745
Telephone: (310) 952-1700 x1713
Email: [email protected]

21.2. LACMTA in its capacity as RIITS Administrator Contact

Agency Name: Los Angeles County Metropolitan Transportation Authority Contact Name: Mr. Kali Fogel
Title: RIITS Administrator
Address: 1 Gateway Plaza
Los Angeles, CA 90012
Telephone: (213) 922-2665
Email: [email protected]

22. ELECTRONIC SIGNATURES
Each Party agrees that electronic signatures, whether digital or encrypted, of the Parties included in this Agreement are intended to authenticate this writing and to have the same force and effect as manual signatures. Delivery of a copy of this Agreement or any other document contemplated hereby bearing an original or electronic signature by facsimile, by electronic mail in “portable document format” (“.pdf”) form, or by any other electronic means intended to preserve the original graphic and pictorial appearance of a document, will have the same effect as physical delivery of the paper document bearing an original or electronic signature.

IN WITNESS WHEREOF, the Parties have caused this Agreement to be executed by their duly authorized representatives as of the dates indicated below.

Los Angeles County Metropolitan
Transportation Authority, in its
capacity as the duly authorized
RIITS Administrator
City of Carson

STEPHANIE WIGGINS

CHIEF EXECUTIVE OFFICER

By:

Steven Gota
Executive Officer
Date Lula Davis-Holmes
Mayor
Date

CITY OF CARSON 701 East Carson Street
Report to Honorable Mayor and City Council
Tuesday, March 17, 2026, 5:00 PM
CONSENT 21. To: Honorable Mayor and City Council From: Dr. Arlington Rodgers, Director of Public Works PW Engineering Subject: CONSIDER AUTHORIZING STAFF TO ADVERTISE FOR CONSTRUCTION BIDS FOR PROJECTNO. 1776 - CALAS PARK STORMWATER AND WATER QUALITY IMPROVEMENTS SUPPLEMENTALENVIRONMENTAL PROJECT, APPROVE REQUIRED CEQA ACTIONS, AND APPROVE A USE ANDMAINTENANCE AGREEMENT WITH THE LOS ANGELES COUNTY FLOOD CONTROL DISTRICT (CITYCOUNCIL) I. SUMMARY
Project No. 1776, titled the Calas Park Stormwater and Water Quality Improvements - Supplemental Environmental Project, is part of the City’s Capital Improvement Program (CIP). The CIP is the City’s program for planning and building major public improvements such as park upgrades, roadway repairs, and infrastructure projects that benefit the community. This project is funded through an Administrative Civil Liability payment from the Los Angeles County Sanitation Districts (Exhibit No. 1). This funding source results from a regulatory settlement and must be used for projects that improve stormwater quality and help protect local waterways and the environment.

The purpose of this project is to improve how stormwater/rainwater that runs off streets, sidewalks, and other hard surfaces, is captured and treated before it is released into the regional drainage system. The project includes the installation of underground stormwater diversion systems that will redirect runoff into a treatment chamber located beneath the baseball field at Calas Park. Inside this underground chamber, the stormwater will pass through filtration and treatment systems designed to remove pollutants and debris before the water is discharged by the City into the storm drain system. These improvements will help improve local water quality and support the City’s compliance with state and regional stormwater regulations. In addition to the stormwater treatment improvements, the project also includes several park enhancements intended to improve accessibility, safety, and the overall appearance of the park. These improvements include constructing a new landscaped planter area near the tennis courts, installing a new walkway to improve access within the park, upgrading fencing in certain areas, and planting new trees to enhance the park environment.

The Plans, Specifications, and Engineer’s Estimates (PS&E) for Project No. 1776 have been completed and the project is ready to move forward to the construction bidding phase. The PS&E are the detailed engineering drawings and technical construction documents that contractors use to prepare their bids and build the project according to the City’s requirements. These documents are on file in the City Engineer’s office. The estimated construction cost for the project is $6,102,502, which includes a 10 percent contingency to cover potential unforeseen conditions that may arise during construction.

The project has also completed the required environmental review under the California Environmental Quality Act (CEQA), which is a state law that requires public agencies to evaluate potential environmental impacts of proposed projects. Compliance with CEQA for this project was achieved through preparation of an Initial Study and Mitigated Negative Declaration (Exhibit No. 2). This environmental document concluded that the project will not have significant environmental impacts if certain mitigation measures are implemented. Following project approval, the City will file a Notice of Determination with the Los Angeles County Clerk and the State Clearinghouse (Exhibit No. 3). Filing this notice formally documents that the City has completed the CEQA review process.

Because several of the stormwater diversion connections will link to storm drains that are owned and operated by the Los Angeles County Flood Control District (LACFCD), the City must obtain permits from that agency before construction can begin. In order to obtain these permits, the City must enter into a Use and Maintenance Agreement with LACFCD (Exhibit No. 4). This agreement establishes the City’s responsibility for operating and maintaining the stormwater diversion improvements after they are constructed.

At this time, City Council is being asked to authorize staff to move forward with the next steps needed to implement the project. Specifically, the City Council is requested to authorize staff to advertise the project for construction bids, authorize the execution and recording of the required CEQA documents, and approve the Use and Maintenance Agreement with the Los Angeles County Flood Control District so that the project may proceed to construction.

II. RECOMMENDATION
TAKE the following actions:

1. AUTHORIZE staff to advertise the project and invite construction bids for Project No. 1776 – Calas Park Stormwater and Water Quality Improvements Supplemental Environmental Project;

2. APPROVE the California Environmental Quality Act (CEQA) Initial Study and Mitigated Negative Declaration (MND) for the proposed project, which confirms that the project will not have significant environmental impacts when required mitigation measures are implemented;

3. AUTHORIZE staff to file and record a Notice of Determination for the project with the Los Angeles County Clerk and the State Clearinghouse at the Governor’s Office of Planning and Research, as required under CEQA following project approval;

4. APPROVE the Use and Maintenance Agreement with the Los Angeles County Flood Control District, which allows the project to connect to and utilize the County’s storm drain system and establishes the City’s responsibility for maintaining the related stormwater improvements; and,

5. AUTHORIZE the Mayor to execute the Use and Maintenance Agreement with the Los Angeles County Flood Control District, subject to approval as to form by the City Attorney.

III. ALTERNATIVES

1. DO NOT APPROVE the above recommendations. However, staff will not be able to proceed with the construction of the project.

2. TAKE another action the City Council deems appropriate, consistent with the requirements of the law.

IV. BACKGROUND
Project No. 1776, titled Calas Park Stormwater and Water Quality Improvements, is included in the City’s Capital Improvement Program (CIP) for Fiscal Year 2025-2026. The CIP is the City’s long-term program used to plan and construct major public improvements such as park upgrades, roadway repairs, and infrastructure projects that serve the community. This project is funded through the Los Angeles County Sanitation Districts as part of a Supplemental Environmental Project, and the estimated cost to construct the improvements is $6,102,502.

The primary purpose of Project No. 1776 is to improve stormwater management and water quality within the City.

Stormwater is rainwater that flows off streets, sidewalks, parking lots, and other hard surfaces and can carry pollutants such as trash, oil, and sediment into the storm drain system and nearby waterways. The project includes the installation of underground stormwater diversion systems, which will capture runoff and direct it into a treatment chamber located beneath the baseball field at Calas Park. Within this chamber, the stormwater will be temporarily detained and filtered to remove pollutants before being released into the Dominguez Channel, a regional waterway that ultimately conveys water to the Pacific Ocean.

In addition to the underground stormwater treatment system, the project will include a new landscaped planter area designed to collect stormwater runoff from nearby streets. This planter area will allow water to naturally filter through soil and vegetation, which helps remove pollutants before the water enters the storm drain system. The project also includes several above-ground improvements that will enhance park accessibility, safety, and overall usability. These improvements include the construction of a new pedestrian pathway within the park, repairs to an existing pathway located near the underground treatment chamber, installation of a taller fence around the baseball field, and the planting of new trees throughout the project area to enhance the park environment.

On July 2, 2024, the City Council awarded a professional services contract to Craftwater Engineering to prepare the project’s Plans, Specifications, and Engineer’s Estimates (commonly referred to as PS&E). These documents include the detailed engineering drawings and technical requirements that contractors use to prepare construction bids and build the project according to the City’s design standards. Craftwater Engineering has completed the PS&E, which have been reviewed and approved by the Engineering Services Division of the Public Works Department. The project is now ready to move forward to the construction bidding phase. Craftwater Engineering will also continue to support the City during construction by providing engineering and technical assistance as needed.

The project has completed the required environmental review under the California Environmental Quality Act (CEQA), which is a state law that requires public agencies to evaluate the potential environmental impacts of proposed projects. The environmental review concluded that the project will not result in significant environmental impacts when mitigation measures are implemented. This determination was documented through the preparation of an Initial Study and Mitigated Negative Declaration (MND). The MND was circulated for a required 30-day public review and comment period, which concluded on November 24, 2025. During this review period, the City received one public comment, which has since been addressed.

Because the project will connect to existing storm drain facilities owned and operated by the Los Angeles County Flood Control District (LACFCD), the City must obtain permits from LACFCD before construction can begin. As part of the permitting process, the City is required to accept LACFCD’s terms for using the storm drain system and enter into a Use and Maintenance Agreement with LACFCD. Under this agreement, the City agrees to operate and maintain the new stormwater diversion structures once they are constructed. The agreement has been reviewed and approved by the City Attorney and is now ready for City Council consideration and approval.

At this time, City Council is being asked to authorize staff to move forward with the next steps necessary to implement the project. Specifically, staff is requesting authorization to advertise the project for construction bids, authorize the signing and recording of documents required to complete the CEQA process, and approve the Use and Maintenance Agreement with the Los Angeles County Flood Control District so that the project may proceed to construction.

V. FISCAL IMPACT
No funding approval is being requested as part of this staff report at this time. Instead, staff is requesting authorization from the City Council to advertise the project for construction bids. The current preliminary estimate for construction of the project is $6,102,502. Funding for this project is primarily being provided through a regulatory settlement associated with stormwater compliance. On January 17, 2024, the California Regional Water Quality Control Board - Los Angeles Region issued Order No. R4-2023-0088, which established an Administrative Civil Liability (ACL) Order related to stormwater management requirements. Under this order, the Los Angeles County Flood Control District (LACFCD) agreed to provide $5,980,000 to the City of Carson to implement Project No. PW1776 - Calas Park Stormwater and Water Quality Improvements Supplemental Environmental Project.

These funds are being held and distributed through an escrow agreement (Exhibit No. 5), which ensures that the funding is used specifically for the approved environmental improvement project. A portion of the ACL funding has already been used to complete the project design. The City previously awarded a design contract to Craftwater Engineering to prepare the project’s detailed engineering plans, specifications, and cost estimates. The design contract totaled $719,942, which was paid from the ACL funds. After accounting for this design cost, approximately $5,260,058 remains available from the ACL funding source to support construction of the project. If the final construction cost exceeds the remaining ACL funds, any additional costs will be covered using Measure W funding. Measure W is a voter-approved funding program in Los Angeles County that supports projects designed to improve stormwater capture, water quality, and regional water sustainability.

Construction of the project is currently anticipated to begin in summer 2026, following completion of the bidding process and award of a construction contract. The construction funding for this project will be formally incorporated into the City’s Fiscal Year 2026-2027 Capital Improvement Program (CIP) budget as part of the City’s annual budget development and approval process.

VI. EXHIBITS

1. Location Map

2. Initial Study/Mitigated Negative Declaration

3. Notice of Determination

4. Use and Maintenance Agreement

5. Calas Park SEP Escrow Agreement

Attachments
Exhibit 1 - Location Map
Exhibit 2 - Initial Study/Mitigated Negative Declaration Exhibit 3 - Notice of Determination
Exhibit 4 - Use and Maintenance Agreement
Exhibit 5 - Calas Park SEP Escrow Agreement

CITY OF CARSON
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CALAS PARKEXISTING STORM DRAIN
CITY OF CARSONCALAS PARK STORMWATER AND WATER QUALITY IMPROVEMENTSSHEET INDEXPAGE #SHEET #SHEET TITLE1G-01TITLE SHEET2G-02GENERAL NOTES3V-01EXISTING CONDITIONS4C-01SITE PLAN5C-02DEMOLITION PLAN6C-03EROSION CONTROL PLAN7C-04HORIZONTAL CONTROL PLAN8C-05GRADING PLAN9C-06BIOSWALE GRADING PLAN10C-07UTILITY PLAN & PROFILE - ALIGNMENT A (I)11C-08UTILITY PLAN & PROFILE - ALIGNMENT A (II)12C-09UTILITY PLAN & PROFILE - ALIGNMENTS B & C13C-10DETAILS 114C-11DETAILS 215C-12DETAILS 316C-13DETAILS 417C-14DETAILS 518IR-01IRRIGATION NOTES AND LEGEND19IR-02IRRIGATION PLAN20ID-03IRRIGATION DETAILS21ID-04IRRIGATION DETAILS22LP-01PLANTING NOTES AND LEGEND23LP-02LANDSCAPE PLAN24LD-03LANDSCAPE DETAILS25LD-04LANDSCAPE DETAILS26E-01GENERAL ELECTRICAL NOTES27E-02ELECTRICAL LEGEND & ABBREVIATIONS28E-03SINGLE LINE DIAGRAM29E-04PANEL SCHEDULE AND LOADS30E-05POWER & CONTROL PLAN VIEW31E-06GROUNDING PLAN VIEW32E-07CABLE & CONDUIT SCHEDULE33E-08ELECTRICAL DETAILS I34E-09ELECTRICAL DETAILS II35S-01STRUCTURAL GENERAL NOTES AND LOAD CRITERIA36S-02STRUCTURAL ABBREVIATIONS AND SPECIAL INSPECTIONS37S-03STANDARD DETAILS38S-04DIVERSION STRUCTURE PLANS39S-05DIVERSION STRUCTURE SECTIONS40I-01PID41I-02DETAIL 1 G-01

SUPPLEMENTAL ENVIRONMENTAL PROJECT
VICINITY MAPLOCATION MAP1" = 100'

NOT TO SCALE
PROJECT LIMITS OF WORKDIVERSION 1DIVERSION 2DIVERSION 3 DIVERSION 4

SUBSURFACE STORAGE GALLERY

CARNEGIE MIDDLE SCHOOL

BIOSWALE

Initial Study/Mitigated Negative Declaration
Calas Park Stormwater and Water
Quality Improvements
Supplemental Environmental Project
DECEMBER 2025
Prepared for:

CITY OF CARSON
Public Works Department
701 East Carson Street
Carson, California 90745
Contact: Roland Jen
Prepared by:

2280 Historic Decatur Road, Suite 200
San Diego, California 92106
Contact: Hayley Rundle

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Table of Contents

SECTION PAGE
Acronyms and Abbreviations ............................................................................................................................................. v 1 Introduction .......................................................................................................................................................... 1

1.1 Project Background and Overview ........................................................................................................ 1

1.2 Purpose and Need .................................................................................................................................. 2

1.3 California Environmental Quality Act Compliance ................................................................................ 2

1.3.1 Authority to Prepare an MND ................................................................................................... 2

1.3.2 Public Review and Final MND Process .................................................................................... 2 2 Project Description ............................................................................................................................................... 5

2.1 Project Location and Environmental Setting ........................................................................................ 5

2.2 Project Characteristics ........................................................................................................................... 5

2.2.1 Stormwater Capture System .................................................................................................... 5

2.2.2 Park Improvements .................................................................................................................. 7

2.2.3 Temporary Construction Access, Staging, and Park Closure ................................................. 7

2.3 Construction Phasing and Schedule ..................................................................................................... 7

2.4 Project Operation .................................................................................................................................... 8

2.5 Permits and Approvals ........................................................................................................................... 9 3 Initial Study Checklist........................................................................................................................................ 11

3.1 Aesthetics ............................................................................................................................................ 15

3.2 Agriculture and Forestry Resources ................................................................................................... 17

3.3 Air Quality ............................................................................................................................................. 18

3.4 Biological Resources ........................................................................................................................... 34

3.5 Cultural Resources .............................................................................................................................. 38

3.6 Energy .................................................................................................................................................. 44

3.7 Geology and Soils ................................................................................................................................ 46

3.8 Greenhouse Gas Emissions ................................................................................................................ 51

3.9 Hazards and Hazardous Materials ..................................................................................................... 57

3.10 Hydrology and Water Quality ............................................................................................................... 61

3.11 Land Use and Planning ....................................................................................................................... 64

3.12 Mineral Resources .............................................................................................................................. 65

3.13 Noise .................................................................................................................................................... 65

3.14 Population and Housing ...................................................................................................................... 70

3.15 Public Services .................................................................................................................................... 72

3.16 Recreation ............................................................................................................................................ 73

3.17 Transportation ..................................................................................................................................... 74

3.18 Tribal Cultural Resources .................................................................................................................... 80

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3.19 Utilities and Service Systems .............................................................................................................. 82

3.20 Wildfire ................................................................................................................................................. 84

3.21 Mandatory Findings of Significance ................................................................................................... 86 4 References and Preparers ................................................................................................................................ 89

4.1 References Cited ................................................................................................................................. 89

4.2 List of Preparers .................................................................................................................................. 94

APPENDICES
A Air Quality and Greenhouse Gas Modeling
B Construction Health Risk Assessment Modeling
C Biological Resources Species List
D Calas Park Cultural Resources Inventory Report
E Energy Calculations
F Confidential Paleontological Resources Record Search
G Noise Assessment Data

FIGURES
1 Project Location ................................................................................................................................................ 95 2 Project Site and Existing Features ................................................................................................................... 97 3 Project Stormwater Capture and Treatment System ...................................................................................... 99 4 Vegetation Communities and Land Cover Types........................................................................................... 101 5 Noise Measurement Locations ...................................................................................................................... 103 TABLES
2-1 Anticipated Construction Phasing and Equipment ............................................................................................ 8

3.3-1 SCAQMD Air Quality Significance Thresholds .................................................................................................. 21

3.3-2 Construction Scenario Assumptions ................................................................................................................ 23

3.3-3 Estimated Maximum Daily Construction Criteria Air Pollutant Emissions - Unmitigated .............................. 25

3.3-4 Estimated Maximum Daily Operational Criteria Air Pollutant Emissions - Unmitigated................................ 25

3.3-5 Construction Localized Significance Thresholds Analysis - Unmitigated ....................................................... 28

3.3-6 American Meteorological Society/Environmental Protection Agency Regulatory Model Principal Parameters ........................................................................................................................................ 30

3.3-7 Construction Health Risk Assessment Results – Unmitigated....................................................................... 31

3.3-8 Construction Health Risk Assessment Results – Mitigated ........................................................................... 32

3.5.1 Previous Technical Studies Within 1 Mile of the Project Site ......................................................................... 39

3.5-2 Previously Recorded Cultural Resources Within 1 Mile of the Project Area .................................................. 40

3.6-1 Total Proposed Project Construction Petroleum Demand .............................................................................. 45

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3.8-1 Estimated Annual Construction Greenhouse Gas Emissions ......................................................................... 54

3.8-2 Estimated Annual Operational Greenhouse Gas Emissions .......................................................................... 54

3.13-1 Measured Samples of Existing Outdoor Ambient Sound Level ...................................................................... 66

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Acronyms and Abbreviations
Acronym/Abbreviation Definition
AB Assembly Bill
AERMOD
American Meteorological Society/Environmental Protection Agency Regulatory Model
AQMP air quality management plan
BMP best management practice
CAAQS California Ambient Air Quality Standards
CalEEMod California Emissions Estimator Model
CAL FIRE California Department of Forestry and Fire Protection CARB California Air Resources Board
CEQA California Environmental Quality Act
CH4 methane
CHRIS California Historical Resources Information System City City of Carson
CO carbon monoxide
CO2 carbon dioxide
CO2e carbon dioxide equivalent
dBA A-weighted decibel
DC WMG Dominguez Channel Watershed Management Area Group DPM diesel particulate matter
EPA U.S. Environmental Protection Agency
EWMP Enhanced Watershed Management Program
FEMA Federal Emergency Management Agency
GHG greenhouse gas
GWP global warming potential
HARP2 Hotspots Analysis and Reporting Program Version 2 HRA health risk assessment
I Interstate
ips inches per second
IS initial study
LCI Governor’s Office of Land Use and Climate Innovation Leq equivalent noise level over a given period
LOS level of service
LST localized significance threshold
MM Mitigation Measure
MND mitigated negative declaration
MS4 Municipal Separate Storm Sewer System
MT metric tons
N2O nitrous oxide
NAAQS National Ambient Air Quality Standards
NAHC Native American Heritage Commission

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Acronym/Abbreviation Definition
NHMLA Natural History Museum of Los Angeles County
NO2 nitrogen dioxide
NOx oxides of nitrogen
O3 ozone
PM10 particulate matter with an aerodynamic diameter equal to or less than 10 microns PM2.5 particulate matter with an aerodynamic diameter equal to or less than 2.5 microns ppm parts per million
PPV peak particle velocity
PRC California Public Resources Code
RTP/SCS Regional Transportation Plan/Sustainable Communities Strategy SB Senate Bill
SCAB South Coast Air Basin
SCAG Southern California Association of Governments
SCAQMD South Coast Air Quality Management District
SCCIC South Central Coastal Information Center
SLF Sacred Lands File
SO2 sulfur dioxide
SOx sulfur oxides
SWPPP stormwater pollution prevention plan
TAC toxic air contaminant
TCR tribal cultural resource
VMT vehicle miles traveled
VOC volatile organic compound

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1 Introduction
The City of Carson (City) has prepared this mitigated negative declaration (MND) to assess and disclose the potential impacts on the environment of the Calas Park Stormwater and Water Quality Improvements Supplemental Environmental Project (project) pursuant to the California Environmental Quality Act (CEQA) (California Public Resources Code [PRC] Section 21000, et. seq ). This section of the MND provides information on project background, explains the project’s purpose and need, and describes the City ’s CEQA obligations associated with approving and implementing the project.

1.1 Project Background and Overview
Calas Park is a public recreational facility maintained by the City’s Parks and Recreation Department, located west of the Dominguez Channel. It is located in the southern portion of the City at 1000 East 220 th Street, south of East 220th Street between Bonita Street and South Edgar Street. Additional information regarding Calas Park is provided in Section 2.1, Project Location and Environmental Setting. Calas Park amenities include a community center with an activity room and recreation room, playground equipment, two tennis courts, a basketball court, a soccer field, two baseball/softball fields, a wading pool, and restroom facilities. The majority of Calas Park is owned by the City, and the west side of Calas Park is in a utility easement maintained by Los Angeles City Department of Water and Power.

The project would divert and capture stormwater runoff from existing storm drains into a subterranean concrete basin proposed beneath the north east corner of the baseball/softball and soccer outfields in the park. Prior to flowing into the subsurface basin, runoff would be directed through a pre-treatment device that would remove trash, sediments, and solids present in the runoff. An electric pump would be installed to return treated stormwater back to the existing catch basin. Other improvements associated with the stormwater capture infrastructure include installation of a vegetated bioswale north of the tennis courts to capture street runoff , planting of 11 new trees, and reconstructing the sidewalk and drain immediately west of the tennis courts to repair surface lifting and damage, and the accompanying drain on its edge.

Once the proposed stormwater capture and filtration facility is installed, the existing baseball/softball and soccer outfields would be replaced. The existing outfield fence along East 220th Street would be replaced with a 12 -foot fence and ballfield turf removed for construction of the project would be replaced with city -provided soil and sod specifications, and a new booster pump to assist the existing irrigation system would be evaluated The project is the result of the 2023 Settlement Agreement and Stipulation Order No. R4-2023-0088 (Stipulated Order) between the Sanitation Districts and the Los Angeles Regional Water Quality Control Board. The Sanitation Districts have agreed to provide funding for the City to implement the project workplan in response to violations occurring from discharge of untreated wastewater into the Dominguez Channel. The performance goal included in the Stipulated Order is for the project to capture and pre -treat 2.8 acre-feet of stormwater annually and infiltrate the stormwater onsite through the use of underground storage vaults, bioswales, rain gardens, and infiltration galleries.

The City is a member of the Dominguez Channel Watershed Management Area Group (DC WMG) . The DC WMG formed to plan, implement, and manage water quality control projects in the Dominguez Channel watershed . The DC WMG is a collaborative effort of eight municipalities1 and the Los Angeles County Flood Control District, which

1 The DC WMG municipalities are County of Los Angeles, City of Los Angeles, City of Hawthorne, City of Inglewood, City of El Segundo, City of Lomita, City of Carson, and City of Lawndale.

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respectively are governed by the Los Angeles County Municipal Separate Storm Sewer System (MS4) Permit (Order No. R4 -2012-0175). The DC WMG prepared the Enhanced Watershed Management Program (EWMP) in 2016 (revised in June 2021) to plan and prioritize projects implementing the requirements of the MS4 permits on a watershed scale (DC WMG 2016). The MS4 permit sets effluent and receiving water limitations for municipal drainage systems in Los Angeles County, and requires permittees to establish plans to meet specific total maximum daily load requirements for discharge of pollutants in their respective receiving waters. This project has the potential to offer runoff storage and water quality benefits for the City and other DC WMG members, helping to achieve EWMP goals and MS4 permit compliance.

The City is implementing the project in their capacity as a result of the Stipulated Order between the Sanitation Districts and the Los Angeles Regional Water Quality Control Board and would be responsible for operating and maintaining the project facilities.

1.2 Purpose and Need
The project’s primary purpose is to decrease the amount of pollutants in stormwater and dry-weather runoff entering the Dominguez Channel. The City’s objectives in implementing the project are as follows:
▪ Comply with the requirements of the Stipulated Order
▪ Improve water quality within the Dominguez Channel
▪ Restore and rehabilitate park facilities
▪ Educate the public on the local stormwater issues

1.3 California Environmental Quality Act Compliance

1.3.1 Authority to Prepare an MND
Approval by the Carson City Council to issue a construction contract for the project constitutes a discretionary action that triggers environmental review requirements pursuant to CEQA, with the City serving as lead agency. The City prepared a CEQA initial study (IS) to analyze and consider the environmental impacts of implementing the project, which is included as Chapter 3 of this document. Based on the results of the IS, the City determined that an MND is the appropriate environmental document for compli ance with CEQA. As stated in Section 21064 of the CEQA statute, an MND may be prepared for a project subject to CEQA when an IS has identified no potentially significant effects on the environment when mitigation is identified that can reduce impacts to less-than-significant levels.

1.3.2 Public Review and Final MND Process
The City is making the MND available for public review and comment pursuant to Section 15073 of the CEQA Guidelines. A physical copy of the MND may be reviewed at Carson City Hall, Planning Division, during regular business hours at 701 East Carson Street, California 90745. The MND and supporting appendices are also available for review on the City ’s website ( https://ci.carson.ca.us/PublicWorks/CEQA.aspx ). The City has identified a 30 -day review and comment period for the MND commencing October 24 , 2025 and terminating November 24, 2025.

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Comments on the MND may be submitted to the City in writing before the end of the public review period. In reviewing and commenting on the MND, interested public agencies and members of the public should focus on the adequacy of the document in identifying and analyzing the project’s potential impacts on the environment. Written comments on the IS/MND will be accepted in hard copy or email format, and should be received at the following street address or email address by 5:00 p.m., November 24, 2025:

City of Carson
701 East Carson Street
Carson, California 90745
Contact: Roland Jen
Email: [email protected]
Following the close of the public comment period, City staff will review all comments and may revise the MND if necessary to clarify the document’s content. City staff will then prepare a final version of the MND that includes all comment letters received during the public review period and will send the MND to the City Council for adoption and consideration in their decision to approve the project.

The environmental impact review presented in this MND is based on an initial design of the stormwater capture project (90% design). As additional design is completed following the City Council’s adoption of the MND, City staff will review project details, compare them to the information presented in the MND, and determine conformance with the project’s CEQA record. Minor deviations from the design assumed in the MND may be addressed either by a consistency determination by City staff or by an addendum to the MND. If subsequent changes in the project are substantial to the extent that they “require majo r revisions of the previous…negative declaration due to the involvement of new significant environmental effects or a substantial increase in the severity of previously identified significant effects,” then the City would be required by Section 15162 of the CEQA Guidelines to prepare a subsequent MND, initiate an additional CEQA public review period, and send the subsequent MND to the City Council for adoption.

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2 Project Description

2.1 Project Location and Environmental Setting
The project is located in the southern portion of the City, which is in southwestern Los Angeles County, as shown in Figure 1, Project Location. The project site includes portions of East 220 th Street between Bonita Street and South Edgar Street and covers approximately 5.87 acres, including the two baseball/softball outfields, the soccer field, the tennis courts, the basketball court, and the parking area at Calas Park. The park is in a developed part of the City that primarily features residential, commercial, office, and light i ndustrial/warehousing uses and schools. The park is upside down L -shaped with a transmission line corridor running along the western portion of the park. The primary components of the park are concentrated in the north and northeast areas of the park.

To t he north, the park is bounded by East 220 th Street, followed by Carnegie Middle School, a grassy area containing the transmission line corridor, and residential uses. To the south, the park is bounded by East Jay Street, followed by residential uses , and East 223rd Street, followed by light industrial/warehousing, office, and commercial uses. To the east, the park is bounded by South Edgar Street, followed by residential uses. To the west, the park is bounded by residential uses. Regional access to the park is from Interstate (I) -405, which is approximately 0.18 miles to the east; State Route 47, which is approximately 1.55 miles to the east; and I -110, which is 1.60 miles to the west; and I -710, which is approximately 2.72 miles to the east. The site is des ignated as Park/Open Space in the City General Plan Land Use Policy Map (City of Carson 2023) and is zoned as Open Space in the City Zoning Map (City of Carson 2017).

Calas Park features flat terrain and is approximately 8.80 acres. Existing park uses are shown in Figure 2, Project Site and Existing Features . The majority of the park is made up of baseball /softball fields, a soccer field that is configured in the outfield areas of the baseball /softball fields, the tennis courts, and the basketball court . An asphalt parking lot is located in the northeastern portion of the park accessed from East 220th Street, and features 16 regular parking spaces and two ADA parking spaces. There are paved walking paths, benches, and picnic tables throughout the park. Field lighting is provided from a series of light poles situated around the fields. Mature trees grow in various areas around the park. An irrigation system with underground pipes and sprinkler heads is in place throughout the park. The grass fields are currently used for formal sports leagues for youth and adults year-round.

2.2 Project Characteristics
The project entails constructing and operating a stormwater capture and treatment facility within the northern portion of Calas Park, as well as other ancillary park improvements. The project is currently in the final design phase, and the City has developed certain design and engineering assumptions for purposes of defining the project for informational purposes and conducting environmental impact review pursuant to CEQA. Actual details of the project may vary from the information provided below.

2.2.1 Stormwater Capture System
The stormwater capture and treatment facility would intercept stormwater and dry-weather flow from three existing underground storm drains, one north of the intersection of East 220 th Street and Bonita Street ; one along East 220th Street; and one north of the existing tennis courts where the proposed bioswale would be located, and a box culvert storm drain in East 220 th Street and convey flows into an underground storage reservoir that would be

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installed beneath the northeast corner of the baseball/softball and soccer outfields area. An electric pump would be installed to return treated stormwater back to the existing catch basin. The stormwater capture project features are shown in Figure 3, Proposed Stormwater Capture and Treatment System.

Stormwater Diversion Infrastructure and Pretreatment Devices A 5.6 cubic feet per second concrete diversion pipeline with manhole access would be constructed within East 220th Street running from the intersection of East 220th Street and Bonita Street to north of the tennis courts at Calas Park. The diversion pipeline would be constructed to connect the proposed system to the existing 42 -inch storm drain north of the intersection of East 220th Street and Bonita Street, the existing 24-inch storm drain located south of the intersection of East 220 th Street and Foley A venue intersection underneath Calas Park, and the existing 6’ × 2.25’ box culvert storm drain located west of the East 220 th Street and Foley Avenue intersection under the north sidewalk. Diversion structures along the diversion pipeline would be underground concrete vaults encasing the existing storm drains and connecting the existing storm drains to the 18-inch-diameter underground diversion pipeline. The diversion structures would have a manhole for personnel and equipment access. The diversion structures and pipeline would carry water by gravity into an underground pretreatment unit installed along the diversion pipeline alignment inside a concrete vault with a manhole for personnel and equipment access. The pretreatment device is a 5.6 cubic feet per second hydrodynamic separator, which directs water through a screen to filter out large debris and into a cylindrical separation chamber where water swirls and forces particles out of the runoff, settling them in an isolated sump. Hydrocarbons float to the t op of the water surface and are prevented from being transported downstream.

Storage Reservoir and Infiltration Galleries
After pretreatment, water would flow into a filter along the diversion line and then into an underground storage reservoir installed beneath the northeast corner of the baseball and soccer field s area. The underground storage reservoir would have a capacity of 1 acre-foot and would have an area of approximately 0.1 4 acres according to preliminary design information. The field surface would be removed, and earth material would be excavated, removed, and hauled off site for reuse or disposal. The excavation is anticipated to be 20 feet deep. The underground stormwater storage system would be formed as a series of precast cells made of reinforced, high - strength concrete that would be hauled to the site on flatbed trucks, lowered into place by a crane, and grouted together to form a single chamber. Once the system is installed and tested, the baseball/softball and soccer fields surfaces would be replaced and would continue to function as under current conditions.

A geotechnical evaluation of the project site concluded that soils beneath Calas Park are of insufficient infiltrative capability to allow for subgrade percolation (Ninyo & Moore 2025) . The reservoir will be designed to facilitate filtration of captured stormwater. The storage reservoir will be supported on spread footings on compacted fill, in accordance with the geotechnical evaluation (Ninyo & Moore 2025).

Discharge System and Treatment
A pump station with an electric pump would be installed to pump treated stormwater to the existing catch basin.

Water flowing back into the storm drain would be cleaner than when originally diverted, having been through a pre- treatment hydrodynamic separator system and cartridge filter system, as well as having been clarified while retained in the reservoir.

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Bioswale
A vegetated bioswale would be installed north of the park’s tennis courts and south of East 220th Street, featuring native vegetation and decorative boulders. The bioswale and permavoid located beneath the bioswale would capture and detain surface storm runoff from East 220th Street and a portion of the park and carry it to an inlet pipe connecting to the diversion pipeline to be filtered and stored within the stormwater capture system.

2.2.2 Park Improvements
The proposed park improvements would replace existing amenities with improved features that would allow for similar active and passive recreation uses as under existing conditions, but with an enhanced experience for park users. Once the stormwater capture system is installed, the existing baseball/softball and soccer outfields would be replaced. The existing outfield fence along East 220th Street would be replaced with a 12-foot fence and ballfield turf removed for construction of the project would be replaced with city-provided soil and fescue specifications, and a new booster pump to assist the existing irrigation system would be evaluated. The project would reconstruct the sidewalk and drain immediately west of the tennis courts to repair surface lifting and damage, and the accompanying drain on its eastern edge. A decomposed granite path would be installed on the east side of the tennis courts to provide a connection from the sidewalk into the park. A new landscaped area would be installed adjacent to the decomposed granite path between the tennis courts and parking lot. Two new benches would be installed adjacent to the bioswale area north of the tennis courts and 11 new trees would be planted within the project area.

2.2.3 Temporary Construction Access, Staging, and Park Closure Construction access would be provided from East 220th Street. Temporary equipment staging and construction trailers would be established within the existing park boundary, with no additional off-site staging anticipated to be needed. The baseball and soccer fields are expected to be closed to the public for the duration of project construction, which is anticipated to be 14 months. The remaining portions of the park ( tennis courts, basketball courts, the parking lot, and the existing structures) would be open to the public during construction.

2.3 Construction Phasing and Schedule
Table 2-1 presents the anticipated construction phasing, equipment usage, and duration assumed for the project for purposes of environmental impact analysis in this MND. These assumptions were developed in consultation with the project design engineers for consideration in Section 3.3, Air Quality; Section 3.6, Energy; Section 3.8, Greenhouse Gas Emissions; and Section 3.13, Noise. The total duration of project construction is anticipated to be approximately 1 4 months, with some phases overlapping. Typical construction work hours would be Monday through Friday, 7:00 a.m. to 6:00 p.m. Night work is not anticipated. Temporary partial road closures for construction of the project would be performed pursuant to a traffic control plan prepared by the construction contractor and subject to City approval. Construction is anticipated to begin in October 2026 with a duration of approximately 14 months.

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Table 2-1. Anticipated Construction Phasing and Equipment Construction Phase Anticipated Equipment
Estimated
Duration
Demolition of existing field and structures Dozer 10 weeks Grader
Skid steer loader
Haul trucks
Site preparation, clearing, and grubbing Dozer 4 weeks
Tractor/loader/backhoe
Jack hammer
Haul trucks
Reservoir excavation Dozer 14 weeks
Tractor/loader/backhoe
Skid steer loader
Haul trucks
Reservoir construction Crane 10 weeks
Dozer
Skid steer loader
Installation of pipe, diversion structures, pre-
treatment facility, pump, and bioswale overflow inlet
Crane 10 weeks
Trencher
Skid steer loader
Haul trucks
Outlet line construction Dozer 4 weeks
Skid steer loader
Tractor/loader/backhoe
Field replacement, bioswale planting/landscaping,
and other site improvement
Grader 16 weeks
Skid steer loader
Pavers
Paving equipment
Rollers
Turf aerator
Spreader sprayer
Telehandler
Cement mixer
Boom lift

2.4 Project Operation
Once construction is complete, project operation is anticipated to entail routine maintenance performed by the City at the stormwater capture facility and other park features. Routine maintenance and operations would require up to two workers. Reservoir maintenance would entail removal of debris and pollutant constituents from the treatment devices, pump testing and calibration, and cleaning the storage reservoir.

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2.5 Permits and Approvals
The City of Carson is the CEQA lead agency, with the Carson City Council holding primary responsibility for adopting this MND and approving commencement of project construction. The project will also require the issuance of an excavation permit and an encroachment permit by the City for the proposed digging and construction within the public right-of-way. Other public agency approvals include the following:
▪ A Major Modification Permit issued by the Los Angeles County Flood Control District ▪ The State Water Resources Control Board will serve as a responsible agency under CEQA for their approval of a stormwater pollution prevention plan (SWPPP) in compliance with the Construction General Permit.

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3 Initial Study Checklist

1. Project title:

Calas Park Stormwater and Water Quality Improvements Supplemental Environmental Project

2. Lead agency name and address:

City of Carson
701 East Carson Street
Carson, California 90745

3. Contact person and phone number:

Roland Jen
Public Works Department
701 East Carson Street
Carson, California 90745

4. Project location:

The project is located in the southern portion of the City of Carson within a portion of the existing Calas Park at 1000 East 220th Street, Carson, California.

5. Project sponsor’s name and address:

City of Carson
701 East Carson Street
Carson, California 90745

6. General plan designation:

Park/Open Space

7. Zoning:

Open Space

8. Description of project. (Describe the whole action involved, including but not limited to later phases of the project, and any secondary, support, or off-site features necessary for its implementation. Attach additional sheets if necessary):

Refer to Chapter 2, Project Description, above.

9. Surrounding land uses and setting: Briefly describe the project’s surroundings:

Refer to Section 2.1, Project Location and Environmental Setting, above.

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10. Other public agencies whose approval is required (e.g., permits, financing approval, or participation agreement):

Los Angeles County Flood Control District; State Water Resources Control Board

11. Have California Native American tribes traditionally and culturally affiliated with the project area requested consultation pursuant to Public Resources Code section 21080.3.1? If so, is there a plan for consultation that includes, for example, the determi nation of significance of impacts to tribal cultural resources, procedures regarding confidentiality, etc.?
Refer to Sections 3.5 and 3.18, below.

Environmental Factors Potentially Affected
The environmental factors checked below would be potentially affected by this project, involving at least one impact that is a “Potentially Significant Impact,” as indicated by the checklist on the following pages.

Aesthetics Agriculture and
Forestry Resources
Air Quality
Biological Resources Cultural Resources Energy
Geology and Soils Greenhouse Gas
Emissions
Hazards and Hazardous
Materials
Hydrology and Water Quality Land Use and
Planning
Mineral Resources
Noise Population and
Housing
Public Services
Recreation Transportation Tribal Cultural Resources Utilities and Service Systems Wildfire Mandatory Findings of Significance

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Determination (To be completed by the Lead Agency)
On the basis of this initial evaluation:

I find that the proposed project COULD NOT have a significant effect on the environment, and a NEGATIVE DECLARATION will be prepared.

I find that although the proposed project could have a significant effect on the environment, there will not be a significant effect in this case because revisions in the project have been made by or agreed to by the project proponent. A MITIGATED NEGATIVE DECLARATION will be prepared.

I find that the proposed project MAY have a significant effect on the environment, and an ENVIRONMENTAL IMPACT REPORT is required.

I find that the proposed project MAY have a “potentially significant impact” or “potentially significant unless mitigated” impact on the environment, but at least one effect (1) has been adequately analyzed in an earlier document pursuant to applicable le gal standards, and (2) has been addressed by mitigation measures based on the earlier analysis as described on attached sheets. An ENVIRONMENTAL IMPACT REPORT is required, but it must analyze only the effects that remain to be addressed.

I find that although the proposed project could have a significant effect on the environment, because all potentially significant effects (a) have been analyzed adequately in an earlier ENVIRONMENTAL IMPACT REPORT or NEGATIVE DECLARATION pursuant to appli cable standards, and (b) have been avoided or mitigated pursuant to that earlier ENVIRONMENTAL IMPACT REPORT or NEGATIVE DECLARATION, including revisions or mitigation measures that are imposed upon the proposed project, nothing further is required.

Signature

Date

10/08/2025

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Evaluation of Environmental Impacts
A brief explanation is required for all answers except “No Impact” answers that are adequately supported by the information sources a lead agency cites in the parentheses following each question. A “No Impact” answer is adequately supported if the referenc ed information sources show that the impact simply does not apply to projects like the one involved (e.g., the project falls outside a fault rupture zone). A “No Impact” answer should be explained where it is based on project -specific factors as well as ge neral standards (e.g., the project would not expose sensitive receptors to pollutants, based on a project - specific screening analysis).

All answers must take account of the whole action involved, including off-site as well as on-site, cumulative as well as project-level, indirect as well as direct, and construction as well as operational impacts.

Once the lead agency has determined that a particular physical impact may occur, then the checklist answers must indicate whether the impact is potentially significant, less than significant with mitigation, or less than significant. “Potentially Significant Impact” is appropriate if there is substantial evidence that an effect may be significant. If there are one or more “Potentially Significant Impact” entries when the determination is made, an Environmental Impact Report (EIR) is required. “Negative Declaration: Less Than Significant With Mitigation Incorporated” applies where the incorporation of mitigation measures has reduced an effect from “Potentially Significant Impact” to a “Less Than Significant Impact.” The lead agency must describe the mitigation measures, and briefly explain how they reduce the effect to a less than significant level.

Earlier analyses may be used where, pursuant to the tiering, program EIR, or other CEQA process, an effect has been adequately analyzed in an earlier EIR or negative declaration. Section 15063(c)(3)(D). In this case, a brief discussion should identify the following:
a. Earlier Analysis Used. Identify and state where they are available for review. b. Impacts Adequately Addressed. Identify which effects from the above checklist were within the scope of and adequately analyzed in an earlier document pursuant to applicable legal standards, and state whether such effects were addressed by mitigation measures based on the earlier analysis. c. Mitigation Measures. For effects that are “Less Than Significant With Mitigation Measures Incorporated,” describe the mitigation measures which were incorporated or refined from the earlier document and the extent to which they address site-specific conditions for the project.

Lead agencies are encouraged to incorporate into the checklist references to information sources for potential impacts (e.g., general plans, zoning ordinances). Reference to a previously prepared or outside document should, where appropriate, include a reference to the page or pages where the statement is substantiated.

Supporting Information Sources: A source list should be attached, and other sources used or individuals contacted should be cited in the discussion.

This is only a suggested form, and lead agencies are free to use different formats; however, lead agencies should normally address the questions from this checklist that are relevant to a project ’s environmental effects in whatever format is selected.

The explanation of each issue should identify:
a. the significance criteria or threshold, if any, used to evaluate each question; and b. the mitigation measure identified, if any, to reduce the impact to less than significance

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3.1 Aesthetics

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
I. AESTHETICS – Except as provided in Public Resources Code Section 21099, would the project:
a) Have a substantial adverse effect on a
scenic vista?
b) Substantially damage scenic resources,
including, but not limited to, trees, rock
outcroppings, and historic buildings within a
state scenic highway?

c) In non-urbanized areas, substantially
degrade the existing visual character or
quality of public views of the site and its
surroundings? (Public views are those that
are experienced from publicly accessible
vantage point). If the project is in an
urbanized area, would the project conflict
with applicable zoning and other regulations
governing scenic quality?

d) Create a new source of substantial light or
glare which would adversely affect day or
nighttime views in the area?

a) Would the project have a substantial adverse effect on a scenic vista? Less-than-Significant Impact. Scenic vistas generally refer to views of expansive open space areas or other natural features, such as mountains, undeveloped hillsides, large natural water bodies, or coastlines.

Certain urban settings or features, such as a striking or renowned skyline, may also represent a scenic vista. Scenic vistas are generally accessible from public vantage points, such as public roadways and parks.

The City’s General Plan Open Space and Environmental Conservation Element, which provides guidance and policies for th e management of the City ’s natural resources, does not specifically list or identify any designated scenic vistas or specific scenic resources within the City. Calas Park is in a predominantly residential area of the City that features a single -family residential development, interspersed with commercial, industrial, and public uses. Project construction would result in temporary visual changes to the park, including the presence of excavated areas and staging of construction equipment. Upon completion of c onstruction, these temporary visual changes would cease , and the visual quality of the project site would return to conditions similar to pre -construction conditions. The project’s infrastructure would mostly be located underground and would not be visible during project operation. Other project components would include replacement of existing amenities with improved features, as described in Section 2.2.2, Park Improvements, which are intended in part as improvements to the visual environment.

As such, impacts would be less than significant.

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b) Would the project substantially damage scenic resources, including, but not limited to, trees, rock outcroppings, and historic buildings within a state scenic highway? No Impact. There are no designated state scenic highways in the vicinity of the project site. The nearest eligible scenic highway is a segment of Highway 1 located approximately 7 miles southeast of the project site (Caltrans 2024). Due to intervening development and distance, the project site is not visible from this segment of Highway 1. Therefore, the project would not substantially damage scenic resources within a state scenic highway and no impact would occur.
c) In non-urbanized areas, would the project substantially degrade the existing visual character or quality of public views of the site and its surroundings? (Public views are those that are experienced from publicly accessible vantage point). If the project is in an urbanized area, would the project conflict with applicable zoning and other regulations governing scenic quality?
No Impact. Per PRC Section 21071, an “urbanized area” is defined as “(a) An incorporated city that meets either of the following criteria: (1) Has a population of at least 100,000 persons. [or] (2) Has a population of less than 100,000 persons if the population of that city and not more than two contiguous incorporated cities combined equals at least 100,000 persons.” The project site is located in the incorporated City of Carson, which has a population of 95,558 persons as of the 2020 census (U.S. Census B ureau 2020).

However, with the incorporation of the population of a contiguous city such as the City of Compton, which has a population of 95,740 as of the 2020 census, the project site is considered to be located in an urbanized area (U.S. Census Bureau 2020).

As discussed in Section 3.1(a), Aesthetics, above, the project site is not visible from any prominent public viewpoints. Temporary visible elements associated with the project include construction equipment, staging activities, and temporary fencing to be included for safety and security purposes. Visual impacts resulting from construction activities would be temporary, ceasing upon completion of construction.

The project would comply with any applicable zoning or other regulations governing scenic quality. The project site is not subject to overlay zones or other such designations specific to scenic resources or quality.

The proposed stormwater capture and treatment facility would be located primarily underground. In addition, the project would include replacement of existing amenities with improved features as described in Section 2.2. 2, Park Improvements, which would enhance the park ’s visual quality. The project would result in the continued use of the site as a park and would not substantially differ visually from its current use. Implementation of the project would not conflict with the applicable zoning and other regulations governing scenic quality. No impact would occur.
d) Would the project create a new source of substantial light or glare which would adversely affect day or nighttime views in the area?
Less-than-Significant Impact. The project is located in an urban area with existing sources of nighttime lighting from roadways, residences, and the existing Calas Park. Existing lighting at Calas Park consists of lighting within facilities, including existing field lighting, and along pedestrian pathways for safety and security. No nighttime work would occur during construction of the project; therefore, construction activities would not result in a new source of nighttime light . The proposed project would not include removal, replacement, or installation of any lighting. The materials that would be used for the project would not be reflective in nature and would not serve as a new source of glare (such as large areas of glass). Therefore, impacts would be less than significant.

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3.2 Agriculture and Forestry Resources

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
II. AGRICULTURE AND FORESTRY RESOURCES – In determining whether impacts to agricultural resources are significant environmental effects, lead agencies may refer to the California Agricultural Land Evaluation and Site Assessment Model (1997) prepared by the California Dept. Conservation as an optional model to use in assessing impacts on agriculture and farmland. In determining whether impacts to forest resources, including timberland, are significant environmental effects, lead agencies may refer to information compiled by the California Department of Forestry and Fire Protection regarding the state’s inventory of forest land, including the Forest and Range Assessment Project and the Forest Legacy Assessment project; and forest carbon measurement methodology provided in Forest Protocols adopted by the California Air Resources Board. Would the project:
a) Convert Prime Farmland, Unique Farmland,
or Farmland of Statewide Importance
(Farmland), as shown on the maps prepared
pursuant to the Farmland Mapping and
Monitoring Program of the California
Resources Agency, to non-agricultural use?

b) Conflict with existing zoning for agricultural
use, or a Williamson Act contract?
c) Conflict with existing zoning for, or cause
rezoning of, forest land (as defined in Public
Resources Code Section 12220(g)),
timberland (as defined by Public Resources
Code Section 4526), or timberland zoned
Timberland Production (as defined by
Government Code Section 51104(g))?

d) Result in the loss of forest land or
conversion of forest land to non-forest use?
e) Involve other changes in the existing
environment which, due to their location or
nature, could result in conversion of
Farmland, to non-agricultural use or
conversion of forest land to non-forest use?

a) Would the project convert Prime Farmland, Unique Farmland, or Farmland of Statewide Importance (Farmland), as shown on the maps prepared pursuant to the Farmland Mapping and Monitoring Program of the California Resources Agency, to non-agricultural use? No Impact. According to the California Important Farmland Finder database, the project site and its immediate surroundings are classified as “Urban and Built-Up Land” (DOC 2025a). The project would not be located on land classified as Farmland pursuant to the Farmland Mapping and Monitoring Program and would therefore not convert any Farmland to non-agricultural use. No impact would occur.

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b) Would the project conflict with existing zoning for agricultural use, or a Williamson Act contract? No Impact. The project site is zoned Open Space. Surrounding Calas Park are areas zoned Residential – Single Family (City of Carson 2017). The City does not contain any lands zoned for agricultural use. There are no existing lands under a Williamson Act contract within the City. Therefore, the project would not conflict with existing zoning for agricultural use or a Williamson Act contract. No impact would occur. c) Would the project conflict with existing zoning for, or cause rezoning of, forest land (as defined in Public Resources Code Section 12220(g)), timberland (as defined by Public Resources Code Section 4526), or timberland zoned Timberland Production (as defined by Government Code Section 51104(g))? No Impact. The project site and surrounding areas are entirely urbanized, and are not zoned for nor contain any forest land or timberland. Therefore, the project would not conflict with or cause the rezoning or conversion of forest land or timberland. No impact would occur. d) Would the project result in the loss of forest land or conversion of forest land to non-forest use? No Impact. Refer to Section 3.2(c), Agriculture and Forestry Resources. No impact would occur. e) Would the project involve other changes in the existing environment which, due to their location or nature, could result in conversion of Farmland, to non -agricultural use or conversion of forest land to non-forest use?
No Impact. Refer to Sections 3.2(a) through 3.2(d). The project site is located in an urbanized area with no existing agricultural uses, Farmland, or forest lands in the vicinity. The City does not contain any lands zoned for agricultural uses. Therefore, the project would not involve other changes that could result in conversion of Farmland to non -agricultural use or conversion of forest land to non -forest use. No impact would occur.

3.3 Air Quality

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
III. AIR QUALITY – Where available, the significance criteria established by the applicable air quality management district or air pollution control district may be relied upon to make the following determinations. Would the project:
a) Conflict with or obstruct implementation of
the applicable air quality plan?
b) Result in a cumulatively considerable net
increase of any criteria pollutant for which
the project region is non-attainment under
an applicable federal or state ambient air
quality standard?

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Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
c) Expose sensitive receptors to substantial
pollutant concentrations?
d) Result in other emissions (such as those
leading to odors) adversely affecting a
substantial number of people?

This section is based on technical analysis conducted by Dudek, including quantitative estimates of air pollutant emissions based on assumptions developed in consultation with the project design engineers. The results of the emissions estimates are provide d as Appendix A, Air Quality and Greenhouse Gas Modeling, and Appendix B, Construction Health Risk Assessment Modeling, to this MND. a) Would the project conflict with or obstruct implementation of the applicable air quality plan? Less-than-Significant Impact. The project site is located within the South Coast Air Basin (SCAB), which includes all of Orange County and the western, non -desert portions of Los Angeles, Riverside, and San Bernardino Counties. The site is within the jurisdictional boundaries of the So uth Coast Air Quality Management District (SCAQMD).

The SCAQMD administers the SCAB ’s air quality management plan (AQMP), which is a comprehensive document outlining an air pollution control program for attaining the California Ambient Air Quality Standards (CAAQS) and National Ambient Air Quality Standards (NAAQS). The most recently adopted AQMP for the SCAB is the 20 22 AQMP (SCAQMD 20 22). The 2022 AQMP provides the regional path towards improving air quality and meeting federal standards for air pollutants. The 2022 AQMP builds upon measures already in place from previous AQMPs. It also includes a variety of additional strategies such as regulation, accelerated deployment of available cleaner technologies (e.g., zero emissions technologies, when cost-effective and feasible, and low oxides of nitrogen [NOx] technologies in other applications), best management practices ( BMPs), co-benefits from existing programs (e.g., climate and energy efficiency), incentives, and other C lean Air Act measures to achieve the 2015 federal ozone (O3) standard by 2037 (SCAQMD 2022).

The purpose of a consistency finding with regard to the AQMP is to determine if a project is consistent with the assumptions and objectives of the 2022 AQMP, and if it would interfere with the region ’s ability to comply with federal and state air quality standards. The SCAQMD has established criteria for determining consistency with the currently applicable AQMP in Chapter 12, Sections 12.2 and 12.3 of the SCAQMD CEQA Air Quality Handbook. These criteria are as follows (SCAQMD 1993):
▪ Consistency Criterion No. 1: Whether the project would result in an increase in the frequency or severity of existing air quality violations, cause or contribute to new violations, or delay timely attainment of the ambient air quality standards or interim emission reductions in the AQMP. ▪ Consistency Criterion No. 2: Whether the project would exceed the assumptions in the AQMP or increments based on the year of project buildout and phase.

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To address the first criterion, project -generated criteria air pollutant emissions have been estimated and analyzed for significance and are addressed under Section 3.3(b) , Air Quality . Detailed results of this analysis are included in Appendix A, Air Quality and Greenhouse Gas Modeling. As presented in that analysis and summarized in Section 3.3(b) , Air Quality , the proposed project would not generate construction or operational criteria air pollutant emissions that exceed the SCAQMD ’s thresholds, and the project would therefore be consistent with Criterion No. 1.

The second criterion regarding the potential of the proposed project to exceed the assumptions in the AQMP or increments based on the year of project buildout and phase is primarily assessed by determining consistency between the proposed project’s land use designations and its potential to generate population growth. In general, projects are considered consistent with, and not in conflict with or obstructing implementation of, the AQMP if the growth in socioeconomic factors is consistent with the underlying regional plans used to develop the AQMP (SCAQMD 1993). The SCAQMD primarily uses demographic growth forecasts for various socioeconomic categories (e.g., population, housing, and employment by industry) developed by the Southern California Association of Governments (SCAG) for its Regional Transportation Plan/Sustainable Communities Strategy (RTP/SCS). Thus, demographic growth forecasts for various socioeconomic categories (e.g., population, housing, employment by industry) developed by SCAG for their 2020–2045 Regional Transportation Plan/Sustainable Community Strategy (RTP/SCS) were used to estimate future emissions in the 2022 AQMP (SCAQMD 2022 ; SCAG 2020).2,3 The SCAG 2020– 2045 RTP/SCS, and associated Regional Growth Forecast, are generally consistent with the local plans; therefore, the 2022 AQMP is generally consistent with local government plans.

The project would not change the existing use of Calas Park and would be consistent with the underlying land use and zoning designations. Upon completion, project operation is anticipated to entail routine maintenance, which would require up to two workers for operations and maintenance. Therefore, the project would not result in substantial unplanned population growth in the area. Accordingly, the project does not conflict with the SCAG RTP/SCS forecasts used in the SCAQMD AQMP development and does not propose activities that would induce additional population in the project area. Impacts would be less than significant.
b) Would the project result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non-attainment under an applicable federal or state ambient air quality standard? Less-than-Significant Impact. Air pollution is largely a cumulative impact. The nonattainment status of regional pollutants is a result of past and present development, and the SCAQMD develops and implements plans for future attainment of ambient air quality standards. Based on these c onsiderations, project-level thresholds of significance for criteria pollutants are used to determine whether a project ’s individual emissions would have a cumulatively considerable contribution to air quality. If a project’s emissions would

2 SCAG adopted Connect SoCal 2024, the 202 4–2050 RTP/SCS (SCAG 2024), but the growth projections therein have not yet been incorporated into an adopted AQMP.
3 Information necessary to produce the emission inventory for the SCAB is obtained from the SCAQMD and other governmental agencies, including CARB, the California Department of Transportation, and SCAG. Each of these agencies is responsible for collecting da ta (e.g., industry growth factors, socioeconomic Projections, travel activity levels, emission factors, emission speciation profile, and emissions) and developing methodologies (e.g., model and demographic forecast improvements) required to generate a comp rehensive emissions inventory. SCAG incorporates these data into their Travel Demand Model for estimating/projecting vehicle miles traveled and driving speeds. SCAG ’s socioeconomic and transportation activities Projections in their 2020–2045 RTP/SCS are integrated in the 2022 AQMP (SCAQMD 2022).

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exceed the SCAQMD significance thresholds, it would be considered to have a cumulatively considerable contribution. Conversely, projects that do not exceed the project -specific thresholds are generally not considered to be cumulatively significant (SCAQMD 2003).

A quantitative analysis was conducted to determine whether the proposed project might result in emissions of criteria air pollutants that may cause exceedances of the NAAQS or CAAQS, or cumulatively contribute to existing nonattainment ambient air quality standards. Criteria air pollutants include O3, nitrogen dioxide (NO2), carbon monoxide (CO), sulfur dioxide (SO2), particulate matter with an aerodynamic diameter less than or equal to 10 microns (PM10), particulate matter with an aerodynamic diameter less than or equal to

2.5 microns (PM 2.5), and lead. Pollutants that are evaluated herein include volatile organic compounds (VOCs) and NOx, which are important because they are precursors to O3, as well as CO, sulfur oxides (SOx), PM10, and PM2.5.

Regarding NAAQS and CAAQS attainment status, 4 the SCAB is designated as a nonattainment area for national and California O 3 standards and PM 2.5 standards. The SCAB is designated as a nonattainment area for California PM 10 standards; however, it is designated as an attainment area for national PM 10 standards. The SCAB is designated as an attainment area for national and California CO standards, national and California NO2 standards, and national and California SO2 standards (EPA 2025; CARB 2023). Although southern Los Angeles County, where the project is located, has been designated as nonattainment for the federal rolling 3-month average lead standard, it is designated attainment for the state lead standard.5 The proposed project would result in emissions of criteria air pollutants for which the California Air Resources Board (CARB) and U.S. Environmental Protection Agency (EPA) have adopted ambient air quality standards (i.e., the NAAQS and CAAQS). Projects that emit these pollutants have the potential to cause, or contribute to, violations of these standards. SCAQMD has established Air Quality Significance Thresholds, as revised in March 2023, that set forth quantitative emission significance thresholds below which a project would not have a significant impact on ambient air quality (SCAQMD 2023). The quantitative air quality analysis provided herein applies the SCAQMD thresholds identified in Table 3.3-1 to determine the potential for the project to result in a significant impact under CEQA.

Table 3.3-1. SCAQMD Air Quality Significance Thresholds Criteria Pollutants Mass Daily Thresholds
Pollutant Construction (pounds per day) Operation (pounds per day) VOCs 75 55
NOx 100 55
CO 550 550
SOx 150 150
PM10 150 150

4 An area is designated as in attainment when it is in compliance with the NAAQS and/or the CAAQS. These standards for the maximum level of a given air pollutant that can exist in the outdoor air without unacceptable effects on human health or the public welfare are set by the EPA and CARB, respectively. Attainment = meets the standards; attainment/maintenance = achieves the standards after a nonattainment designation; nonattainment = does not meet the standards. 5 Re-designation of the lead NAAQS designation to attainment for the Los Angeles County portion of the SCAB is expected based on current monitoring data. The phase-out of leaded gasoline started in 1976. Since gasoline no longer contains lead, the project is not anticipated to result in impacts related to lead; therefore, it is not discussed in this analysis.

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Table 3.3-1. SCAQMD Air Quality Significance Thresholds Criteria Pollutants Mass Daily Thresholds
PM2.5 55 55
Leada 3 3
Toxic Air Contaminants (TACs) and Odor Thresholds
TACsb Maximum incremental cancer risk 10 in 1 million Cancer Burden > 0.5 excess cancer cases (in areas 1 in 1 million) Chronic and acute hazard index 1.0 (Project increment) Odor Project creates an odor nuisance pursuant to SCAQMD Rule 402 Ambient Air Quality Standards for Criteria Pollutants c

NO2 1-hour average
NO2 annual arithmetic mean
SCAQMD is in attainment; Project is significant if it causes or contributes to an exceedance of the following attainment standards:

0.18 ppm (state)

0.030 ppm (state) and 0.0534 ppm (federal)

CO 1-hour average
CO 8-hour average
SCAQMD is in attainment; Project is significant if it causes or contributes to an exceedance of the following attainment standards:
20 ppm (state) and 35 ppm (federal)

9.0 ppm (state/federal)
PM10 24-hour average

PM10 annual average

10.4 g/m3 (construction)d

2.5 g/m3 (operation)

1.0 g/m3
PM2.5 24-hour average 10.4 g/m3 (construction)d

2.5 g/m3 (operation)
Source: SCAQMD 2023.

Notes: SCAQMD = South Coast Air Quality Management District; VOC = volatile organic compounds; NO x = oxides of nitrogen; CO = carbon monoxide; SOx = sulfur oxides; PM10 = coarse particulate matter; PM 2.5 = fine particulate matter; TAC = toxic air contaminant; NO2 = nitrogen dioxide; ppm = parts per million by volume; g/m3 = micrograms per cubic meter. greenhouse gas emissions thresholds for industrial Projects, as added in the March 2015 revision to the SCAQMD Air Quality Significance Thresholds, were not include included in this table as they are addressed within the greenhouse gas emissions an alysis and not the air quality analysis.
a The phaseout of leaded gasoline started in 1976. Since gasoline no longer contains lead, the Project is not anticipated to re sult in impacts related to lead; therefore, it is not discussed in this analysis. b TACs include carcinogens and noncarcinogens.
c Ambient air quality standards for criteria pollutants are based on SCAQMD Rule 1303, Table A-2, unless otherwise stated. d Ambient air quality threshold are based on SCAQMD Rule 403.

A project would result in a cumulatively considerable net increase for O 3, which is a nonattainment pollutant, if the proposed project’s construction or operational emissions would exceed the SCAQMD VOC or NOx thresholds shown in Table 3.3-1. These emission-based thresholds for O3 precursors are intended to serve as a surrogate for an O3 significance threshold (i.e., the potential for adverse O3 impacts to occur) because O3 itself is not emitted directly, and the effects of an individual project’s emissions of O3 precursors (i.e., VOCs and NOx) on O3 levels in ambient air cannot be determined reliably or meaningfully through air quality models or other quantitative methods.

California Emissions Estimator Model (CalEEMod) Version 2022.1.1.29 was used to estimate emissions from construction and operation of the project. CalEEMod is a statewide computer model developed in cooperation with air districts throughout the state to quantify criteria air pollutant emissions associated

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with construction and operational activities from a variety of land use projects, including recreational development. The following discussion summarizes the quantitative project -generated construction and operational emissions and impacts that would result from implementation of the proposed project.

Construction Emissions
Construction of the proposed project would include demolition, site preparation, reservoir excavation, reservoir construction, pipeline/diversion/treatment facility installation, outlet line construction, and field replacement/bioswale planting and landscaping . These construction activities would result in the temporary addition of pollutants to the local airshed caused by on-site sources (e.g., off-road construction equipment, and soil disturbance) and off-site sources (e.g., vendor trucks, haul trucks, and worker vehicle trips). Specifically, entrained dust results from the exposure of earth surfaces to wind from the direct disturbance and movement of soil, resulting in PM 10 and PM 2.5 emissions. Internal combustion engines used by construction equipment, haul trucks, vendor trucks (i.e., delivery trucks), and worker vehicles would result in emissions of VOC, NO x, CO, PM10, and PM2.5. Construction emissions can vary substantially from day to day depending on the level of activity; the specific type of operat ion; and, for dust, the prevailing weather conditions.

Proposed project construction emissions were estimated using a combination of CalEEMod default assumptions and information provided by the project engineer. It was assumed that approximately 3,980 cubic yards of soil would be exported during reservoir excavation. In addition, demolition of the existing asphalt pavement and concrete sidewalks was estimated to result in approximately 141 tons of material that would be hauled off site. Air quality emissions modeling assumed that construction of the project would commence in October 2026 and would last approximately 14 months. Default values for horsepower and load factor provided in CalEEMod were used for all construction equipment, and the equipment mix was provided by the project engineer. For the analysis, it was generally assumed that heavy -duty construction equipment would be operating at the site 5 days per week, up to a maximum of 8 hours per day. It was assumed that some construction phases would overlap. Construction modeling assumptions are provided in Table 3.3-2.

Table 3.3-2. Construction Scenario Assumptions
Construction Phase
Average Daily One -Way
Vehicle Trips Equipment
Worker
Trips
Vendor
Truck
Trips
Haul
Truck
Trips Equipment Type Quantity
Daily
Usage
Hours
Demolition of existing field
and structures
18 4 4 Rubber Tired Dozers 2 8
Skid Steer Loader 1 8
Graders 2 8
Site preparation, clearing
and grubbing
26 4 4 Rubber Tired Dozers 3 8
Jack Hammers 1 8
Tractors/Loaders/Backhoes 4 8
Reservoir excavation 24 4 8 Rubber Tired Dozers 2 8
Skid Steer Loaders 2 8
Tractors/Loaders/Backhoes 3 8

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Table 3.3-2. Construction Scenario Assumptions
Construction Phase
Average Daily One -Way
Vehicle Trips Equipment
Worker
Trips
Vendor
Truck
Trips
Haul
Truck
Trips Equipment Type Quantity
Daily
Usage
Hours
Reservoir construction 14 2 0 Cranes 1 8
Rubber Tired Dozers 2 8
Skid Steer Loaders 2 8
Installation of pipe,
diversion structures, pre-
treatment facility, pump,
and bioswale overflow
inlet
18 2 4 Cranes 1 8
Trenchers 2 8
Skid Steer Loaders 2 8
Outlet line 18 4 0 Rubber Tired Dozers 2 8
Skid Steer Loaders 2 8
Tractors/Loaders/Backhoes 3 8
Field replacement,
bioswale planting/
landscaping, and other
site improvements
26 2 0 Graders 1 8
Skid Steer Loaders 1 8
Pavers 1 8
Paving Equipment 1 8
Rollers 1 8
Turf Aerators 1 8
Spreader Sprayers 1 8
Telehandlers 1 8
Cement and Mortar Mixers 1 8
Aerial Lifts 1 8
Notes: Appendix A, Air Quality and Greenhouse Gas Modeling.

Emissions generated during construction and operation of the project are subject to the rules and regulations of the SCAQMD. Rule 403, Fugitive Dust,6 requires the implementation of measures to control the emission of visible fugitive/nuisance dust, such as wetting soils that would be disturbed. It was assumed that the active sites would be watered at least two times daily, resulting in an approximately 61% reduction of fugitive dust (CalEEMod default value), to represent compliance with SCAQMD standard dust control measures in Rule 403.

6 SCAQMD Rule 403 requires implementation of various best available fugitive dust control measures for different sources for al l construction activity sources within its jurisdictional boundaries. Dust control measures include, but are not limited to, maintaining stability of soil through pre -watering of site prior to clearing, grubbing, cut and fill, and earth -moving activities; stabilizing soil during and immediately after clearing, grubbing, cut and fill, and other earth-moving activities; stabilizing backfill during handling and at completion of activity; and pre -watering material prior to truck loading and ensuring that freeboard exceeds 6 inches.

Although SCAQMD Rule 403 requires fugitive dust control beyond watering control measures, compliance with Rule 403 is represented in CalEEMod by assuming twice daily watering of active sites (61% reduction in PM10 and PM2.5 [CAPCOA 2022]).

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CalEEMod calculates maximum daily emissions for summer and winter periods. As such, the estimated maximum daily construction emissions for both summer and winter periods are summarized in Table 3.3-3.

Detailed construction model outputs are presented in Appendix A, Air Quality and Greenhouse Gas Modeling.

Table 3.3-3. Estimated Maximum Daily Construction Criteria Air Pollutant Emissions - Unmitigated
Year
VOC NO x CO SO x PM 10 PM 2.5
Pounds per Day
Summer
2027 4.59 42.41 49.22 0.08 7.36 4.34
Winter
2026 6.04 54.66 55.69 0.10 10.66 6.26
2027 4.58 42.46 44.07 0.08 7.36 4.34
Maximum Daily Emissions 6.04 54.66 55.69 0.10 10.66 6.26 SCAQMD Threshold 75 100 550 150 150 55
Threshold Exceeded? No No No No No No
Source: Appendix A, Air Quality and Greenhouse Gas Modeling.

Notes: VOC = volatile organic compound; NO x = oxides of nitrogen; CO = carbon monoxide; SO x = sulfur oxides; PM 10 = coarse particulate matter; PM2.5 = fine particulate matter; SCAQMD = South Coast Air Quality Management District.

Emissions estimates include watering of the active sites two times per day per Rule 403 compliance.

As shown in Table 3.3-3, the proposed project’s maximum daily construction emissions would not exceed SCAQMD thresholds for any criteria pollutant and impacts would be less than significant.

Operational Emissions
The first full year of project operations would be in 2028. Once construction is complete, project operation is anticipated to entail routine maintenance performed by the City at the stormwater capture facility and other park features. Reservoir maintenance would entail removal of debris and pollutant constituents from the treatment devices, pump testing and calibration, and cleaning the storage reservoir. During long-term operations, the project would generate air pollutants from mobile sources, including maintenance workers accessing the site, and area sources, including consumer products and architectural coatings. CalEEMod was used to estimate emissions from these sources. Table 3.3-4 summarizes the maximum daily emissions of criteria pollutants that would be generated by the proposed project and compares the emissions to the SCAQMD’s operational thresholds.

Table 3.3-4. Estimated Maximum Daily Operational Criteria Air Pollutant Emissions - Unmitigated
Source
VOC NO x CO SO x PM 10 PM 2.5
Pounds per Day
Summer
Mobile 0.01 0.01 0.18 <0.01 0.05 0.01
Area 0.01 0.00 0.00 0.00 0.00 0.00

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Table 3.3-4. Estimated Maximum Daily Operational Criteria Air Pollutant Emissions - Unmitigated
Source
VOC NO x CO SO x PM 10 PM 2.5
Pounds per Day
Total 0.02 0.01 0.18 <0.01 0.05 0.01
Winter
Mobile 0.01 0.02 0.16 <0.01 0.05 0.01
Area <0.01 0.00 0.00 0.00 0.00 0.00
Total 0.01 0.02 0.16 <0.01 0.05 0.01
SCAQMD Threshold 55 55 550 150 150 55
Threshold Exceeded? No No No No No No
Source: Appendix A, Air Quality and Greenhouse Gas Modeling.

Notes: VOC = volatile organic compound; NO x = oxides of nitrogen; CO = carbon monoxide; SO x = sulfur oxides; PM 10 = coarse particulate matter; PM 2.5 = fine particulate matter; <0.01 = value is less than 0.005; SCAQMD = South Coast Air Quality Management District.

As shown in Table 3.3 -4, the proposed project’s maximum daily operational emissions would not exceed SCAQMD thresholds for any criteria pollutant and impacts would be less than significant.

Cumulative Impacts
Cumulative localized impacts would potentially occur if a project were to occur concurrently with another off-site project. Schedules for potential future projects near the project area are currently unknown; therefore, potential impacts associated with tw o or more simultaneous projects would be considered speculative.7 However, the project is located in an already developed urban area and any future projects would be subject to CEQA and would require air quality analysis and, where necessary, mitigation. Criteria air pollutant emissions associated with construction activity of future projects would be reduced through implementation of control measures required by the SCAQMD. Cumulative PM10 and PM2.5 emissions would be reduced because all future projects would be subject to SCAQMD Rule 403, Fugitive Dust, which sets forth general and specific requirements for all sites in the SCAQMD.

Therefore, the proposed project would not result in a cumulatively considerable increase in emissions of nonattainment pollutants and impacts would be less than significant during construction and operation. c) Would the project expose sensitive receptors to substantial pollutant concentrations? Less-than-Significant Impact with Mitigation Incorporated. Sensitive receptors are those individuals more susceptible to the effects of air pollution than the population at large. People most likely to be affected by air pollution include children, the elderly, and people with cardiovascular and chronic respiratory diseases. According to SCAQMD, sensitiv e receptors include residences, schools, playgrounds, childcare centers, long-term healthcare facilities, rehabilitation centers, convalescent centers, and retirement homes (SCAQMD 1993).

7 The CEQA Guidelines state that if a particular impact is too speculative for evaluation, the agency should note its conclusion and terminate discussion of the impact (14 CCR 15145).

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The closest off-site sensitive receptors to the project site are single-family residences adjacent to the south and west of the project site, Bonita Street Elementary School adjacent to the northwest of the project site, and Carnegie Middle School adjacent to the north of the project site.

Localized Significance Thresholds
The SCAQMD recommends a localized significance threshold (LST) analysis to evaluate the potential of localized air quality impacts to sensitive receptors in the immediate vicinity of a proposed project from construction and operation; however, an operational LST analysis is not required for the project due to no substantial on-site sources of localized emissions. For projects that disturb 5 acres or less per day, the SCAQMD Final Localized Significance Threshold Methodology (SCAQMD 2008a) includes lookup tables that can be used to determine the maximum allowable daily emissions that would satisfy the localized significance criteria (i.e., the emissions would not cause an exceedance of the applicable concentration limits for NO2, CO, PM10, and PM2.5) without performing project-specific dispersion modeling.

The LST significance thresholds for NO2 and CO represent the allowable increase in concentrations above background levels in the vicinity of a project that would not cause or contribute to an exceedance of the relevant ambient air quality standards, while the threshold for PM10 represents compliance with Rule 403 (Fugitive Dust). The LST significance threshold for PM2.5 is intended to ensure that construction emissions do not contribute substantially to existing exceedances of the PM 2.5 ambient air quality standards. The allowable emission rates depend on the following parameters:

1. Source-Receptor Area in which the project is located

2. Size of the project site

3. Distance between the project site and the nearest sensitive receptor (e.g., residences, schools, hospitals)
The proposed project site is located in Source-Receptor Area 4 (South Coastal LA County). The maximum number of acres disturbed on the peak day was estimated using the Fact Sheet for Applying CalEEMod to Localized Significance Thresholds (SCAQMD n.d.), which provides estimated acres per 8 -hour per day per piece of earth -moving equipment. Based on the SCAQMD guidance, it was estimated that the maximum acres on the project site that would be disturbed by off -road equipment would be 3.5 acres per day; therefore, LSTs for a 3.5-acre disturbed area were interpolated from the SCAQMD 2- and 5-acre LST thresholds. The nearest sensitive receptor land use is located adjacent to the project site. Accordingly, the distance in the LST lookup table of 25 meters is assumed.

According to the Final Localized Significance Threshold Methodology, “off-site mobile emissions from the project should not be included in the emissions compared to the LSTs” (SCAQMD 2008a). Trucks and worker trips associated with the project are not expected to cause substantial air quality impacts to sensitive receptors along off-site roadways since emissions would be relatively brief in nature and would cease once the vehicles pass through the main streets. Nonetheless, vehicle activity may occur within the project boundary (i.e., fence line); therefore, a small portion (i.e., 0.25 miles) of the off -site vehicle travel for worker vehicles, vendor trucks, and haul trucks was conservatively assumed as on -site emissions for the LST analysis.

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The maximum daily on-site emissions generated from construction of the proposed project are presented in Table 3.3 -5 and are compared to the SCAQMD localized significance criteria to determine whether project-generated on-site emissions would result in potential LST impacts.

Table 3.3-5. Construction Localized Significance Thresholds Analysis - Unmitigated Year
NOx CO PM10 PM2.5
Pounds per Day
Summer
2027 41.71 46.88 6.84 4.21
Winter
2026 53.84 54.09 10.07 6.10
2027 41.72 42.78 6.84 4.21
Maximum Daily Emissions 53.84 54.09 10.07 6.10
SCAQMD LST Criteriaa 102.5 1,186.0 10.5 6.5
Threshold exceeded? No No No No
Source: Appendix A, Air Quality and Greenhouse Gas Modeling.

Notes: NOx = oxides of nitrogen; CO = carbon monoxide; PM 10 = particulate matter with a diameter less than or equal to 10 microns; PM2.5 = particulate matter with a diameter less than or equal to 2.5 microns; SCAQMD = South Coast Air Quality Management District; LST = localized significance threshold.

The values shown are the maximum summer or winter daily emissions results from CalEEMod. The total values may not add up exactly due to rounding. Emissions estimates include watering of the active sites two times per day per Rule 403 compliance. a Localized significance thresholds are shown for a 3.5-acre disturbed area for a sensitive receptor distance of 25 meters in Source-Receptor Area 4 (South Coastal LA County).

As shown in Table 3.3-5, proposed construction activities would not generate emissions that would exceed the site-specific LST criteria, and impacts would be less than significant.

CO Hotspots
Traffic-congested roadways and intersections have the potential to generate localized high levels of CO.

Localized areas where ambient concentrations exceed federal and/or state standards for CO are termed CO “hotspots.” CO transport is extremely limited and disperses rapidly with distance from the source. Under certain extreme meteorological conditions, however, CO concentrations near a congested roadway or intersection may reach unhealthy levels affecting sensitive receptors. Typically, high CO concentrations are associated with severely congested intersections operating at an unacceptable level of service (LOS) (LOS E or worse is unacceptable). Projects contributing to adverse traffic impacts may result in the formation of a CO hotspot. Additional analysis of CO hotspot impacts would be conducted if a project would result in a significant impact or contribute to an adverse traffic impact at a signalized intersection that would potentially subject sensitive receptors to CO hotspots.

At the time that the SCAQMD Handbook (1993) was published, the SCAB was designated nonattainment under the CAAQS and NAAQS for CO. In 2007, the SCAQMD was designated in attainment for CO under both the CAAQS and NAAQS as a result of the steady decline in C O concentrations in the SCAB due to turnover of older vehicles, introduction of cleaner fuels, and implementation of control technology on

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industrial facilities. The SCAQMD conducted CO modeling for the 2003 AQMP8 (SCAQMD 2003) for the four worst-case intersections in the SCAB: (1) Wilshire Boulevard and Veteran Avenue, (2) Sunset Boulevard and Highland Avenue, (3) La Cienega Boulevard and Century Boulevard, and (4) Long Beach Boulevard and Imperial Highway. At the time, the 2003 AQMP was prepared, the intersection of Wilshire Boulevard and Veteran Avenue was the most congested intersection in Los Angeles County, with an average daily traffic volume of about 100,000 vehicles per day. The 2003 AQMP also projected 8 -hour CO concentrations at these four intersections for 1997 and from 2002 through 2005. From years 2002 through 2005, the maximum 8-hour CO concentration was 3.8 ppm at the Sunset Boulevard and Highland Avenue intersection in 2002; the maximum 8-hour CO concentration was 3.4 ppm at the Wilshire Boulevard and Veteran Avenue in 2002. Accordingly, CO concentrations at congested intersections would not exceed the 1-hour or 8-hour CO CAAQS unless projected daily traffic would be at least over 100,000 vehicles per day. The project ’s anticipated increase in trips is minimal and is not of a magnitude expected to raise the traffic volumes at intersections within proximity of the proposed project to the 100,000 vehicles per day that could result in a CO hotspot.

Additionally, ambient CO levels are monitored at the air quality monitoring station located at 700 North Bullis Road, Compton, which is approximately 6 miles northeast of the project site and represents ambient air quality in the project area. Ambient CO levels monitored at this representative monitoring station indicate that the highest recorded 1 -hour concentration of CO is 3. 5 ppm (the State standard is 20 ppm) and highest 8 -hour concentration is 3.1 ppm (the State standard is 9 ppm) during the past 3 years of available data (EPA 2025a). As discussed above, the highest CO concentrations typically occur during peak traffic hours, so CO impacts calculated under peak traffic conditions represent a worst-case analysis. Given the considerably low level of CO concentrations in the project area, and the minimal increase in daily trips, project-related mobile emissions are not expected to contribute significantly to CO concentrations, and a CO hotspot is not anticipated to occur. Finally, due to continued improvement in vehicular emissions at a rate faster than the rate of vehicle growth and/or congestion, the potential for CO hotspots in the SCAB is steadily decreasing. Based on these considerations, the proposed project would result in a less -than- significant impact regarding potential CO hotspots.

Toxic Air Contaminants
The greatest potential for toxic air contaminant (TAC) emissions during project construction would be diesel particulate matter (DPM) emissions from heavy equipment operations and heavy -duty trucks. Use of heavy-duty construction equipment is subject to a CARB Airborne Toxics Control Measure for in-use diesel construction equipment to reduce diesel particulate emissions; use of diesel trucks is also subject to an Airborne Toxics Control Measure. Based on the adjacent residential and school receptors, a quantitative health risk assessment (HRA) was prepared for the project. The following discussion summarizes the dispersion modeling , HRA methodology , and results for the proposed project ; supporting HRA documentation, including detailed assumptions, is presented in Appendix B.

SCAQMD has adopted a cancer risk threshold of 10 in a million (SCAQMD 2023), which indicates that a person has an additional risk of 10 chances in a million (0.001%) of developing cancer during their lifetime as a result of the air pollution scenario being evaluated. For context, the National Cancer Institute estimates that approximately 38.9% of people will be diagnosed with cancer during their lifetimes (National Cancer

8 SCAQMD’s CO hotspot modeling guidance has not changed since 2003.

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Institute 2025). The SCAQMD has also adopted a hazard index less than 1.0, below which indicates that people are not likely to experience any non-cancer health effects (SCAQMD 2023).

The SCAQMD ’s Modeling Guidance for American Meteorological Society/E PA Regulatory Model (AERMOD) (SCAQMD 2025a) provides guidance to perform dispersion modeling for use in HRAs within the SCAB. The cancer risk parameters for exposure to TACs, such as age -sensitivity factors, daily breathing rates, exposure period, fraction o f time at home, and cancer potency factors used in the analysis herein are based on the values and data recommended by the Office of Environmental Health Hazard Assessment Air Toxics Hot Spots Program Risk Assessment Guidelines Guidance Manual for Preparation of Health Risk Assessments 2015 (2015 Risk Assessment Guidelines Manual) (OEHHA 2015), as implemented in the Hotspots Analysis and Reporting Program Version 2 (HARP2). Accordingly, this HRA evaluates and reflects conservative, health -protective methodologies to assess health impacts to adults, as well as infants, children, and other sensitive subpopulations.

For risk assessment purposes, PM10 in diesel exhaust is considered DPM, originating mainly from off-road equipment operating at a defined location for a given length of time at a given distance from sensitive receptors. Less-intensive, more-dispersed emissions result from on-road vehicle exhaust (e.g., heavy-duty diesel trucks).

Air dispersion modeling was performed using the EPA ’s AERMOD Version 2 4142 modeling system (computer software) with the Lakes Environmental Software implementation/user interface, AERMOD View Version 13.0. The dispersion modeling included the use of standard regulatory default options. AERMOD parameters were selected as representative of the project site and project activities. Principal parameters of this modeling are presented in Table 3.3-6.

Table 3.3-6. American Meteorological Society/Environmental Protection Agency Regulatory Model Principal Parameters
Parameter Details
Meteorological
Data
AERMOD-specific meteorological data for the Long Beach/Daugherty Field/Airport air monitoring station (KLGB) was used for the dispersion modeling (SCAQMD 2025b). A meteorological data set from 2015-2019 was obtained from the SCAQMD in a preprocessed format suitable for use in AERMOD.

Urban versus
Rural Option
Urban areas typically have more surface roughness as well as structures and low-albedo surfaces that absorb more sunlight—and thus more heat—relative to rural areas. According to SCAQMD guidelines, the urban dispersion option was selected (SCAQMD 2025a).

Terrain
Characteristics
Digital elevation data were imported into AERMOD and elevations were assigned to receptors and emission sources, as necessary. Digital elevation data were obtained through the AERMOD View in the U.S. Geological Survey’s National Elevation Dataset format with a resolution of 1 arc-second resolution. The elevation of the modeled site is

9.65 meters above sea level.

Source Release
Characterizations
Off-road equipment and trucks were modeled as a line of adjacent volume sources across the project site with a release height of 5 meters, a plume height of 10 meters, and plume width of 10 meters (SCAQMD 2008a).

Receptors A nested grid of receptors was centered over the project site with the following resolutions:
▪ 20-meter spacing from the project site out to 200 meters; ▪ 50-meter spacing from 200 meters to 500 meters;

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Table 3.3-6. American Meteorological Society/Environmental Protection Agency Regulatory Model Principal Parameters
Parameter Details
▪ 100-meter spacing from 500 meters to 1,000 meters;
▪ 200-meter spacing from 1,000 meters to 2,000 meters;
▪ 500-meter spacing from 2,000 meters to 5,000 meters.

Source: SCAQMD 2008a; SCAQMD 2025a; SCAQMD 2025b.

Notes: AERMOD = American Meteorological Society/Environmental Protection Agency Regulatory Model; SCAQMD = South Coast Air Quality Management District.

See Appendix B, Construction Health Risk Assessment Modeling, for complete model parameter inputs.

AERMOD was run with the line source emitting unit emissions (1 gram per second) to obtain the necessary input values for HARP2. The ground-level concentration plot files were then used to estimate the long-term cancer health risk to an individual, and the noncancerous chronic health indices. There is no reference exposure level for acute health impacts from diesel particulate matter, and, thus, acute risk was not evaluated.

Cancer risk is defined as the increase in probability (chance) of an individual developing cancer due to exposure to a carcinogenic compound, typically expressed as the increased chances in 1 million. For the construction HRA, the TAC exposure parameters are described below:
▪ Maximally Exposed Individual Resident (MEIR): For residential receptors during project construction and operation, TAC exposure was assumed to begin in the 3rd trimester of pregnancy (assumed to be the worst-case scenario for cancer risk) for a duration of 1.17 years (construction). ▪ School: For school children at Bonita Street Elementary School and Carnegie Middle School during project construction, TAC exposure was assumed to begin at 4 years old for a duration of 1.17 years (construction).

The SCAQMD has also established noncarcinogenic risk parameters for use in HRAs since some TACs increase noncancerous health risk due to long -term (chronic) exposures and some TACs increase noncancerous health risk due to short -term (acute) exposures. Chro nic exposure is evaluated in the construction HRA. Noncarcinogenic risks are quantified by calculating a hazard index, expressed as the ratio between the ambient pollutant concentration and its toxicity or reference exposure level, which is a concentration at or below which health effects are not likely to occur. The chronic hazard index is the sum of the individual substance chronic hazard indices for all TACs affecting the same target organ system. A hazard index less than 1.0 means that adverse health effects are not expected.

Results of the construction HRA without mitigation are presented in Table 3.3-7.

Table 3.3-7. Construction Health Risk Assessment Results – Unmitigated Impact Parameter Units
Project
Impact
CEQA
Threshold Level of Significance
Cancer Risk – MEIR Per Million 59.8 10 Potentially Significant Chronic Hazard Index – MEIR Index Value 0.06 1.0 Less than Significant Cancer Risk – School Per Million 1.6 10 Less than Significant

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Table 3.3-7. Construction Health Risk Assessment Results – Unmitigated Impact Parameter Units
Project
Impact
CEQA
Threshold Level of Significance
Chronic Hazard Index – School Index Value 0.01 1.0 Less than Significant Source: Appendix B, Construction Health Risk Assessment Modeling.

Notes: CEQA = California Environmental Quality Act; MEIR = maximally exposed individual resident.

As shown in Table 3.3 -7, the results of the construction HRA for the project demonstrate that the unmitigated construction DPM emissions would result in a potential maximum cancer risk at the MEIR that would exceed the 10 in a million -cancer risk threshold; however, construction DPM emissions would be below the Chronic Hazard Index threshold. Unmitigated construction DPM emissions would result in a health risk at the nearby schools that would be less than both the cancer risk threshold and the Chronic Hazard Index threshold. Therefore, TAC emissions from construction of the project would result in a potentially significant impact. Mitigation Measure (MM)-AQ-1, which requires use of Level 3 diesel particulate filters for off-road equipment to reduce DPM emissions during project construction, is detailed below.

Table 3.3-8 summarizes the results of the HRA after implementation of MM-AQ-1 for construction of the proposed project.

Table 3.3-8. Construction Health Risk Assessment Results – Mitigated Impact Parameter Units
Project
Impact
CEQA
Threshold Level of Significance
Cancer Risk – MEIR Per Million 9.0 10 Less than Significant Chronic Hazard Index – MEIR Index Value 0.009 1.0 Less than Significant Cancer Risk – School Per Million 0.02 10 Less than Significant Chronic Hazard Index – School Index Value 0.001 1.0 Less than Significant Source: Appendix B, Construction Health Risk Assessment Modeling.

Note: CEQA = California Environmental Quality Act.; MEIR = maximally exposed individual resident.

Includes implementation of MM-AQ-1.

After mitigation, TAC exposure from construction diesel exhaust emissions would result in a residential cancer risk below the 10 in 1 million threshold and the Chronic Hazard Index would still be less than the

1.0 threshold. The health risk at the nearby schools would be further reduced below thresholds. Therefore, after mitigation, the project would result in a less -than-significant impact related to exposure to TAC emissions during construction.

Health Effects of Criteria Pollutants
Short-term project construction would not exceed the significance thresholds for any criteria air pollutants.

In addition, long-term project operational emissions would not exceed any significance thresholds.

VOCs and NOx are precursors to O3, for which the SCAB is designated as nonattainment with respect to the NAAQS and CAAQS. The health effects associated with O3 include respiratory symptoms, worsening of lung disease leading to premature death, and damage to lung tissue (CARB 2025a). The contribution of VOCs and NOx to regional ambient O 3 concentrations is the result of complex photochemistry. The increases in O3 concentrations in the SCAB due to O3 precursor emissions tend to be found downwind from the source

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location to allow time for the photochemical reactions to occur. However, the potential for exacerbating excessive O3 concentrations would also depend on the time of year that the VOC emissions would occur because exceedances of the O 3 CAAQS/NAAQS tend to occur between April and October when solar radiation is highest. The holistic effect of a single project’s emissions of O3 precursors is speculative due to the lack of quantitative methods to reliably and meaningfully assess this impact. However, the project would not exceed the significance thresholds for VOC or NO x; therefore, implementation of the project would contribute minimally to regional O3 concentrations and the associated health effects.

Health effects associated with NO x and NO 2 (which is a constituent of NO x) include lung irritation and enhanced allergic responses (CARB 2025b). However, because project-generated NOx emissions would not exceed the significance threshold during construction or operations, the project would not result in potential health effects associated with NO2 and NOx.

Health effects associated with CO include chest pain in patients with heart disease, headache, light - headedness, and reduced mental alertness (CARB 202 5c). CO tends to be a localized impact associated with congested intersections. The associated potential for CO hotspots were discussed previously and are determined to be a less-than-significant impact. Thus, the project’s CO emissions would not contribute to significant health effects associated with this pollutant.

Health effects associated with particulate matter include premature death and hospitalization, primarily for worsening of respiratory disease (CARB 202 5d). Construction of the project would not exceed the LSTs for PM10 or PM2.5 and would not contribute to exceedances of the NAAQS and CAAQS for particulate matter or obstruct the SCAB from coming into attainment for these pollutants. Due to the minimal contribution of particulate matter during construction and operation, the project is not anticipated to result in health effects associated with PM10 or PM2.5.

In summary, because implementation of the project would not result in exceedances of the SCAQMD significance thresholds during construction and operation, the potential health effects associated with criteria air pollutants are considered less than significant with mitigation incorporated.

MM-AQ-1 Construction Equipment Diesel Particulate Exhaust Minimization. Prior to the start of construction activities and issuance of grading permits, the City or its designee shall ensure that all diesel-powered construction equipment is equipped with a California Air Resources Board (CARB)-certified Level 3 diesel particulate filter or better. d) Would the project result in other emissions (such as those leading to odors) adversely affecting a substantial number of people?
Less-than-Significant Impact. Based on available information, the project is not anticipated to result in other emissions that have not been addressed under Section 3.3(a) through Section 3.3(c). As such, this analysis focuses on the potential for the project to generate odors.

The analysis of other emissions is focused on the potential for an odor impact to occur. The occurrence and severity of potential odor impacts depends on numerous factors. The nature, frequency, and intensity of the source; the wind speeds and direction; a nd the sensitivity of the receiving location each contribute to

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the intensity of the impact. Although offensive odors seldom cause physical harm, they can be annoying and cause distress among the public and generate citizen complaints.

Odors would be generated from vehicles and/or equipment exhaust emissions during construction of the project. Odors produced during construction would be attributable to concentrations of unburned hydrocarbons from tailpipes of construction equipment, architectural coatings, and asphalt pavement application. Such odors would disperse rapidly from the project site and generally occur at magnitudes that would not affect substantial numbers of people. Therefore, impacts associated with odors during construction would be considered less than significant.

Land uses and industrial operations associated with odor complaints include agricultural uses, wastewater treatment plants, food -processing plants, chemical plants, composting operations, refineries, landfills, dairies, and fiberglass molding facilities (SCAQMD 1993). The project does not propose and would not engage in any of these activities or other potential activities that would generate operational odors. The project entails construction of a stormwater capture and treatment facility and improvements to an existing park and would not create any new sources of odors during operation. Therefore, the project would result in an odor impact that is less than significant.

3.4 Biological Resources

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
IV. BIOLOGICAL RESOURCES – Would the project:
a) Have a substantial adverse effect, either
directly or through habitat modifications, on
any species identified as a candidate,
sensitive, or special status species in local
or regional plans, policies, or regulations, or
by the California Department of Fish and
Wildlife or U.S. Fish and Wildlife Service?

b) Have a substantial adverse effect on any
riparian habitat or other sensitive natural
community identified in local or regional
plans, policies, regulations, or by the
California Department of Fish and Wildlife or
U.S. Fish and Wildlife Service?

c) Have a substantial adverse effect on state
or federally protected wetlands (including,
but not limited to, marsh, vernal pool,
coastal, etc.) through direct removal, filling,
hydrological interruption, or other means?

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Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
d) Interfere substantially with the movement
of any native resident or migratory fish or
wildlife species or with established native
resident or migratory wildlife corridors,
or impede the use of native wildlife
nursery sites?

e) Conflict with any local policies or ordinances
protecting biological resources, such as a
tree preservation policy or ordinance?

f) Conflict with the provisions of an adopted
Habitat Conservation Plan, Natural
Community Conservation Plan, or other
approved local, regional, or state habitat
conservation plan?

The following analysis relies on a biological resources assessment utilizing the most recent relevant literature, published research, maps, soil data, biological baseline information, special -status habitats, and species distribution data to assess the potential for biological resources to occur within the project site and a surrounding 100-foot buffer (the study area).

The analysis included a review of the California Department of Fish and Wildlife ’s California Natural Diversity Database (CDFW 202 5a), the California Native Plant Society ’s Inventory of Rare and Endangered Plants (CNPS 2025), and the U.S. Fish and Wildlife Service ’s Information for Planning and Consultation (IPaC; USFWS 202 5a).

These sources were queried based on the U.S. Geological Survey (USGS) 7.5-minute Torrance quadrangle and the surrounding eight quadrangles (San Pedro, Redondo Beach, Venice, Inglewood, South Gate, and Long Beach).

Potential and/or historic drainages and aquatic features were evaluated through review of USGS 1:24,000 -scale topographic maps, aerial imagery, the National Wetland Inventory database (USFWS 202 5b), and the Natural Resources Conservation Service Web Soil Survey (USDA 2025).

Under existing conditions, the entirety of the project site consists of developed land, including partially paved surfaces and buildings. Medium to Large non-native ornamental trees are also present throughout the site.

Field Visit
Dudek biologist Eilleen Salas performed a field survey on February 10, 2025. Temperatures during the survey were between 56°F and 57°F, with 80% cloud cover, and wind speeds ranging between 4 mph and 5 mph. The biological survey included vegetation mapping, the mapping of sensitive biological resources (if present) within the project site plus survey buffer (biological study area), and an evaluation of the potential for special-status species to occur.

Photograph documentation is provided in Appendix C, Biological Resources Species List.

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a) Would the project have a substantial adverse effect, either directly or through habitat modifications, on any species identified as a candidate, sensitive, or special status species in local or regional plans, policies, or regulations, or by the California Department of Fish and Wildlife or U.S. Fish and Wildlife Service? Less than Significant with Mitigation Incorporated . There are 48 special-status plant species and 32 special-status wildlife species with recorded occurrences in the U.S. Geologic Survey’s Torrance, California

7.5-minute topographic quadrangle, in which the project is located, and surrounding eight quadrangles (CDFW 2025a; CNPS 2025; USFWS 2025a ). The biological study area supports three land cover types (ornamental plantings, parks, and urban/developed), as shown on Figure 4, Vegetation Communities and Land Cover Types. Plant species observed within the site generally consisted of non -native ornamental species including tree of heaven (Ailanthus altissima), canary island pine (Pinus canariensis) London plane tree (Platanus acerifolia), and Bermuda grass (Cynodon dactylon). No special-status plants or wildlife were found to have a potential to occur due to the lack of suitable habitat (see Appendix C, Biological Resources Species List, to this MND). Wildlife species observed during the biological resources survey include common avian species found in urbanized settings such as American crow (Corvus brachyrhynchos), black phoebe (Sayornis nigricans), Anna’s hummingbird (Calypte anna), and house finch (Haemorhous mexicanus).

Due to the presence of ornamental trees on the project site that can support nesting for a variety of common, native, and migratory birds, the project may result in significant direct or indirect impacts to nesting birds if project activities occur during the avian nesting season of February through August. To reduce the project’s potential impacts on nesting birds to a less-than-significant level , MM-BIO-1 recommends nesting season avoidance and pre-project nesting bird surveys if the nesting season cannot be avoided.

MM-BIO-1 Nesting Bird Avoidance. The project should avoid the avian nesting season to reduce all potential impacts to protected birds and their nests. In the event the project must commence during the nesting season (February – August), a pre -construction nesting survey should be conducted within 3 days prior to ground disturbing activities to determine the presence/absence of nesting birds. If an active nest is found on the study area, a qualified biologist will establish a buffer around the nest (up to 50 0 feet for raptors and 300 feet for passerine birds) and ongoing biological monitoring during construction may be required until the nestlings have fledged and the nest is no longer active. The buffer will be established by a biologist based on the sensitivity of the species to disturbance and the proximity to project activities. Construction activities may commence outside of the buffer under the discretion of a monitoring biologist. Once the monitoring biologist has determined the nest is no longer active , the buffer can be removed, and construction may continue.
b) Would the project have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional plans, policies, regulations, or by the California Department of Fish and Wildlife or U.S. Fish and Wildlife Service?
No Impact. The proposed project site is within a highly developed and urbanized area lacking natural or native vegetation communities . There are no riparian habitats or other sensitive natural communities identified in local or regional plans, policies, or regulations or by the California Department of Fish and Wildlife or the U.S. Fish and Wildlife Service that were identified on the pr oject site. As such, impacts to

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these biological resources would not occur as a result of the project. Therefore, the project would have no impacts to riparian habitats or other sensitive natural communities. c) Would the project have a substantial adverse effect on state or federally protected wetlands (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means?
No Impact. The project site is developed and urbanized with no riparian habitat present. No permanent or ephemeral natural drainages or watercourses, water bodies, or other resources associated with wetland and non -wetland waters are located on the project site. The project site does not contain any federal jurisdictional wetlands or support any aquatic resources regulated by the U.S. Army Corps of Engineers, Los Angeles Regional Water Quality Control Board , or California Department of Fish and Wildlife as jurisdictional waters of the United States or waters of the state. Therefore, no impacts associated with state or federally protected wetlands would occur.
d) Would the project interfere substantially with the movement of any native resident or migratory fish or wildlife species or with established native resident or migratory wildlife corridors, or impede the use of native wildlife nursery sites?
No Impact. Meffe and Carrol (1997) define wildlife movement corridors, also referred to as dispersal corridors or landscape linkages, as linear features along which animals can travel from one habitat or resource area to another. According to the California Natural Diversity Database search, the project site does not contain any greenbelts for wildlife movement or native vegetation capable of supporting the movement of wildlife, particularly corridors that facilitate movement of species between larger stand s of native habitat. The proposed project is within a highly urbanized area lacking habitat that could provide opportunities for wildlife movement. Construction of the proposed project would not result in encroaching onto or impeding the use of a wildlife corridor or nursery site that local wildlife could use. Therefore, the proposed project would have no impact on wildlife movement corridors or wildlife nursery sites. e) Would the project conflict with any local policies or ordinances protecting biological resources, such as a tree preservation policy or ordinance?
No Impact. The removal of City -owned trees or shrubs that occur within the public right -of-way would be required to comply with all applicable provisions in the City of Carson ’s Tree Preservation and Protection Ordinance. However, the proposed project does not include the removal of any trees within the Study Area.

Therefore, no impacts associated with local policies or ordinances would occur. f) Would the project conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community Conservation Plan, or other approved local, regional, or state habitat conservation plan? No Impact. The biological study area is not within any habitat conservation plan, natural community conservation plan, or other approved local, regional, or state habitat conservation plan (CDFW 2019). As such, the project would not conflict with the provisions of an adopted conservation plan and no impact would occur.

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3.5 Cultural Resources

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
V. CULTURAL RESOURCES – Would the project:
a) Cause a substantial adverse change in the
significance of a historical resource
pursuant to Section 15064.5?

b) Cause a substantial adverse change in the
significance of an archaeological resource
pursuant to Section 15064.5?

c) Disturb any human remains, including those
interred outside of formal cemeteries?

The analysis contained within this section is based on the Cultural Resources Inventory Report prepared for the project by Dudek in April 2025 (Appendix D).
a) Would the project cause a substantial adverse change in the significance of a historical resource pursuant to Section 15064.5?
No Impact. Historic-age structures are those that are built more than 45 years ago and, therefore, have the potential to be considered historical resources pursuant to Section 15064.5 of the CEQA Guidelines.

While some historical resources are also considered archaeological resources, such resources are addressed in Section 2.5(b), as part of the discussion of archaeological resources.

No historical resources were identified in the project site based on the analysis of historic aerial photographs (195 2–2022), historic topographic maps (18 86–2021), or archival background research (NETR 2025). In its current extent, the baseball/softball fields, tennis courts, and associated structures do not meet the minimum age threshold to be considered an historical resource under CEQA.

On December 19, 2024 , Dudek conducted a records search of the California Historical Resources Information System (CHRIS) database at the South Central Coastal Information Center (SCCIC), located on the campus of California State University, Fullerton, in Fullerton, California . The records search results identified a total of 17 previous cultural resources studies that have been conducted within 1 mile of the project (Table 3.5-1); one cultural resource inventory (LA-04512) covers the entirety of the project site.

Report LA -04512 is a Cultural Resources Inventory of the City of Carson, California ( Appendix D) that documents the results of an inventory and evaluation of the cultural heritage resources located within the bounds of the City of Carson. The report was drafted by A.V. Eggers, consulting archaeologist, and consisted of an archival records search, literature review, pedestrian survey, data evaluation and report preparation.

The study area overlaps 100% with the project site. During the pedestrian survey, 8 prehistoric resources were recorded, and 15 historic-era resources were recorded or updated. Three of the cultural resources

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identified in support of this project fall within the records search 1 -mile radius of the currently proposed project. No project-specific management recommendations were proposed for areas adjacent to Calas Park or the other currently proposed work areas but instead reiterated current regulations regarding the treatment of cultural resources.

Table 3.5.1. Previous Technical Studies Within 1 Mile of the Project Site Report ID Year Author Title
Intersects Project Site
LA-04512 1977 Eggers, A.V. Cultural Resources Inventory of the City of Carson, California
Outside of Project Site
LA-00083 1975 Rosen, Martin D. Evaluation of the Archaeological Resources and Potential Impact of the Joint Outfall System’s Improvements on
Sewer Treatment Plants and Installation Routes for New
Large Diameter Sewers, Los Angeles County
LA-02258 1991 Breece, William H. Archaeological Survey Results: Proposed Oil Shell Oil Company Inter-Refinery Pipelines Project Carson,
California
LA-02749 1992 Charroin, Andrea Archaeological Monitoring for Shell Pipeline LA-02751 1992 Padon, Beth Archaeological Survey Results: Proposed Arco Los Angeles Refinery Clean Fuels Project Carson, California
LA-05971 2001 Unknown California Energy Commission Application for Certification BP 5th Train Project City of Carson, Los Angeles County, California
LA-05995 2002 Duke, Curt Cultural Resource Assessment AT&T Wireless Services Facility No. 05226a Los Angeles County, California
LA-06367 2001 Duke, Curt (Duplicate of LA-5438) Cultural Resource Assessment Cingular Wireless Facility No. Vy030-04 Los Angeles
County, California
LA-09627 2008 Wlodarski, Robert J. Proposed Bechtel Wireless Telecommunications Site OC0195 (C & H Printing), Located at 6046 Lincoln Avenue, Cypress, California 90630
LA-10158 2007 Knell, Edward J., and
James Steely
Cultural Resources Survey for the Carson Terminal
Redevelopment Project, Los Angeles County, California
LA-10250 2009 Bonner, Wayne H. Cultural Resources Records Search and Site Visit Results for T-Mobile USA Candidate LA33769B (Ranch Fish
Market), 117 East 223rd Street, Carson, Los Angeles
County, California
LA-10567 2005 Hogan, Michael, Bai
“Tom” Tang, Josh
Smallwood, Laura
Hensley Shaker, and
Casey Tibbitt
Identification and Evaluation of Historic Properties - West Basin Municipal Water District Harbor- South Bay Water
Recycling Project Proposed Project Laterals
LA-10727 2010 Bonner, Wayne H. Cultural Resources Records Search and Site Visit Results for T-Mobile USA Candidate LA33769-C (Ranch Fish
Market), 117 East 223rd Street, Carson, Los Angeles
County, California

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Table 3.5.1. Previous Technical Studies Within 1 Mile of the Project Site Report ID Year Author Title
LA-11150 2003 Maxwell, Pamela West Basin Municipal Water District Harbor/ South Bay Water Recycling Project
LA-11482 1939 Racer, F.H. Camp Sites in Harbor District - F.H. Racer LA-11513 2011 Meyer, Donna M. City of Carson Seismic Retrofit of Carson Senior High School. HMGP 1731-71-54, Finding of No Historic
Properties
LA-12983 2014 Tang, Bai Evaluation of Potential Historical Resource Carson Station, Los Angeles County Sheriff’s Department Los Angeles
County, California UltraSystems Environmental Project No. 5933
Source: Appendix D, Calas Park Cultural Resources Inventory Report.

The CHRIS records search results identified five previously recorded cultural resources within a 1-mile radius of the project site, and none of these resources are located within or are adjacent to the project site (Table 3.5.2).

Table 3.5-2. Previously Recorded Cultural Resources Within 1 Mile of the Project Area
Primary
Number Trinomial Age Description CRHR Eligibility
Outside of Project Area
P-19-000098 CA-LAN-
000098
Prehistoric Suangna Native American Village County Point of Historical Interest (1972)
P-19-000795 CA-LAN-
000795
Prehistoric Lithic scatter with shell, bone, and
diagnostic artifacts
Not Evaluated
P-19-188395 — Historic Carson Terminal, Shell Oil
Company
Recommended Not Eligible
P-19-189309 — Historic Carson Standpipes Not Evaluated
P-19-189868 — Historic Carson Senior High School Recommended Not Eligible Source: Appendix D, Calas Park Cultural Resources Inventory Report.

Note: CRHR = California Register of Historic Resources.

Dudek Archaeologist Ryan Glenn, MA, RPA, conducted a reconnaissance -level pedestrian survey of the project site on January 17, 2025. The pedestrian survey employed standard archaeological procedures and techniques consistent with the Secretary of the Interior ’s Standards for an archaeological resources inventory. Wherever possible, the survey was conducted in parallel transects, spaced no more than 5 meters apart. Due to the majority of the project site being fully developed with paved parking lots and existing structures, an opportunistic method of examining any visible ground surface was required. Where visible, the ground surface was examined for prehistoric artifacts (e.g., flaked stone tools, tool -making debris, stone milling tools, ceramics, fire-affected rock, imported marine shell), soil discoloration that might indicate the presence of a cultural midden, soil depressions, features indicative of the current or former presence of structures or buildings (e.g., standing exterior walls, post holes, foundations), and historic

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artifacts (e.g., metal, glass, ceramics, building materials). Ground disturbances such as rodent/reptile burrows and drainages were also visually inspected for exposed subsurface materials.

When the survey was conducted, the project site was more than 40% developed and covered with either pavement or buildings. Ground surface visibility within the existing project site was variable, with none to fair visibility. Areas that provided some surface visibility included landscaped areas around and within the parking lot, open space south of the parking lot, and the baseball /softball diamonds measuring approximately 98 meters by 122 meters. These areas contained both areas with no vegetation and areas with dense grasses and provided fair to good ground surface visibility. No cultural resources were identified during the pedestrian survey of the project site. As such, there would be no impact. b) Would the project cause a substantial adverse change in the significance of an archaeological resource pursuant to Section 15064.5?
Less Than Significant Impact with Mitigation Incorporated . The analysis of project impacts on archaeological resources is primarily based on the results of the SCCIC records search, review of historic maps and aerial images, and the pedestrian survey. A review of the historic aerials reveals that the project site has undergone ground-disturbing activities to create and maintain the baseball/softball fields, tennis courts, parking lot, and associated structures over the last 40 years. Prior to that, the project site underwent ground-disturbing activities to support a containment pond, and structures utilized for staging of used cars and other equipment (NETR 2025).

Dudek contacted the Native American Heritage Commission (NAHC) on January 30, 2025, and requested a review of their Sacred Lands File (SLF) for the proposed project site. The SLF consists of a database of known Native American cultural resources. These resources may not be included in the SCCIC database and depicted in the records search results. The NAHC replied via email correspondence on February 11, 2025, stating that the SLF search was completed with negative results. The NAHC additionally provided a list of Native American individuals and/or tribal organizations that should be contacted for more information on potential tribal sensitivities regarding the currently proposed project.

Based on the negative results of the SCCIC records search, NAHC SLF request, and pedestrian survey, the project would not cause a substantial adverse change in the significance of an archaeological resource pursuant to CEQA Guidelines Section 15064.5. However, there are previously recorded prehistoric resources located within the 1-mile record search radius and due to the landscaping and grading that has occurred because of the development of the park it is difficult to determine the presence or absence of subsurface archaeological deposits based on surface observations. Additionally, based on the results of the geotechnical analysis there is a possibility of encountering intact foundations over 50 years in age and the presence of alluvium, which has a moderate p otential for supporting the presence of subsurface archaeological deposits. Therefore, the following mitigation measure s, MM-CUL-1, MM-CUL-2, and MM-CUL-3, are recommended to ensure that the potential for impacts to unknown archaeological resources would be appropriately addressed and reduced to less-than-significant levels.

MM-CUL-1 Archaeological Monitoring. Prior to ground disturbance activities, the City and/or subsequent responsible parties should retain a Principal Investigator/Archaeologist, meeting the Secretary of the Interior’s Standards, and with experience in California prehistoric and historic resources (experience within Los Angeles County preferred), to complete the

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following: compose a Cultural Resource Monitoring and Inadvertent Discovery Plan (Plan), manage archaeological monitoring, and address any inadvertent discoveries identified during project implementation. Proof of retainment of the Principal Investigator/Archaeologist should be provided to the City prior to the granting of a grading permit. The purpose of the Plan is to outline cultural monitoring (archaeological and Native American/tribal) protocols and a program of treatment and mitigation in the case of an inadvertent discovery of cultural (archaeological or Native American/tribal) resources during ground-disturbing phases and to provide for the proper identification, evaluation, treatment, and protection of any cultural resources in accordance with CEQA throughout the duration of the project. Existence and importance of adherence to this Plan should be stated on all project site plans intended for use by those conducting the ground-disturbing activities.

The Principal Investigator/Archaeologist should manage archaeological monitoring conducted by archaeological technicians during initial ground disturbances. Initial excavation is defined as initial construction-related earth moving of sediments from their place of deposition. As it pertains to cultural monitoring (archaeological or Native American/tribal), this definition excludes movement of sediments after they have been initially disturbed or displaced by project-related construction. The retained Princi pal Investigator/Archaeologist should oversee and establish monitoring efforts as needed (increase, decrease, or discontinue monitoring frequency) based on the observed potential for construction activities to encounter cultural deposits or material. Proje ct monitoring may be adjusted based on observed surface conditions if sediments appear unlikely to contain buried intact cultural resources. The archaeological monitor should be responsible for maintaining daily monitoring logs. The requirement for archaeo logical monitoring should be noted on all construction plans to ensure implementation. Upon completion of all ground-disturbing activities, an archaeological monitoring report should be prepared within 60 days following completion of ground disturbance and submitted to the City for review. This report should document compliance with approved cultural mitigation, all monitoring efforts, and include an appendix with daily monitoring logs. The final report should be submitted to the City and the South Central Coastal Information Center.

MM-CUL-2 Workers Environmental Awareness Program (WEAP) Training. All construction personnel and monitors who are not trained archaeologists should be briefed regarding unanticipated discoveries prior to the start of ground -disturbing activities. A basic presentation should be prepared and presented by a qualified archaeologist to infor m all personnel working on the project about the archaeological sensitivity of the area. The purpose of the WEAP training is to provide specific details on the kinds of archaeological materials that may be identified during construction of the project and explain the importance of and legal basis for the protection of significant cultural (archaeological or Native American/tribal) resources. Each worker should also be instructed on the proper procedures to follow in the event that cultural resources or human remains are uncovered during ground -disturbing activities. These procedures include work curtailment or redirection, and the immediate contact of the on -call archaeologist and if ap propriate, tribal representative. Necessity of training attendance should be stated on all project site plans intended for use by those conducting the ground-disturbing activities.

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MM-CUL-3 Unanticipated Discovery of Archaeological Resources. In the event that archaeological resources (sites, features, or artifacts) are exposed during construction activities for the project, all construction work occurring within 100 feet of the find shall immediately stop until a qualified archaeologist meeting the Secretary of the Interior ’s Professional Qualification Standards can evaluate the significance of the find. Construction activities may continue in other areas but should be redirected a safe distance from the find. If the new discovery is evaluated and found to be significant under CEQA and avoidance is not feasible, additional work such as data recovery may be warranted. A data recovery plan shall be developed by the qualified archaeologist in consultation with the City and Native American representatives, if applicable. Ground disturbance can continue only after the resources has been properly mitigated and with approval by the City. c) Would the project disturb any human remains, including those interred outside of formal cemeteries? Less Than Significant Impact . As discussed above, the project site has undergone maintenance and modification over the past 70+ years of operation. No prehistoric or historic-period burials, including those interred outside of formal cemeteries, were identified within the project site as a result of the CHRIS records search, NAHC SLF search, or archival background research. Based on the results of the previous research and ground -disturbing activities, the potential for human remains to exist within the project site is considered unlikely. However, it is possible that unknown human remains could be encountered during ground disturbance activities associated with project construction.

In the event that human remains are inadvertently encountered during construction activities, the remains and associated resources must be treated in accordance with state and local regulations that provide requirements with regard to the accidental discov ery of human remains, including California Health and Safety Code Section 7050.5, California Public Resources Code Section 5097.98, and CEQA Guidelines Section 15064.5(e). In accordance with these regulations, if human remains are found, the County Coroner must be immediately notified of the discovery. No further excavation or disturbance of the project site or any nearby area (within 100 feet of the find) reasonably suspected to overlie adjacent remains must occur until the County Coroner has determined if the remains are potentially human in origin. If the County Coroner determines that the remains are, or are believed to be, Native American, he or she is required to immediately notify the NAHC. The NAHC must immediately notify those persons it believes to be the most likely descendant from the deceased Native American. The most likely descendant must then complete their inspection and determine, in consultation with the property owner, the treatment and disposition of the human remains. Therefore, compliance with state and local regulations identified above would ensure that the project would result in a less-than-significant impact related to the inadvertent disturbance of any human remains.

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3.6 Energy

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
VI. Energy – Would the project:
a) Result in potentially significant
environmental impact due to wasteful,
inefficient, or unnecessary consumption of
energy resources, during project
construction or operation?

b) Conflict with or obstruct a state or local plan
for renewable energy or energy efficiency?

a) Would the project result in potentially significant environmental impact due to wasteful, inefficient, or unnecessary consumption of energy resources, during project construction or operation? Less-than-Significant Impact. Project implementation would result in energy use for construction and operation, including use of electricity and petroleum -based fuels. The following analysis evaluates the potential wasteful, inefficient, or unnecessary consumption of these energy sources during construction and operation.

Construction Energy Use
Electricity
Electricity consumed during project construction would vary throughout the construction period based on the construction activities being performed. Various construction activities would require electricity, including conveying water that would be used for dust control (supply and conveyance), powering any necessary lighting or electronic equipment, or other construction activities necessitating electrical po wer.

Such electricity demand would be temporary, nominal, and would cease upon the completion of construction. Therefore, the use of electricity during project construction would not be wasteful, inefficient, or unnecessary.

Natural Gas
There would be no natural gas used during construction. Equipment and vehicles would be powered by petroleum-based fuels as discussed below. Therefore, the use of natural gas during project construction would not be wasteful, inefficient, or unnecessary.

Petroleum-Based Fuels
Construction of the project would consume energy resources as a result of the use of heavy -duty construction equipment, on-road delivery and haul trucks, and workers commuting to and from the project

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site. Petroleum emissions associated with the use of construction equipment and vehicles, which were used to calculate gallons of petroleum consumed, were calculated using CalEEMod and are provided in Appendix C, Biological Resources Species List . Fuel consumption from construction equipment was estimated by converting the total carbon dioxide (CO2) emissions from each construction phase to gallons using the conversion factors for CO 2 to gallons of gasoline or diesel. The conversion factor for gasoline is

8.78 kilograms per metric ton (MT) CO2 per gallon, and the conversion factor for diesel is 10.21 kilograms per MT CO2 per gallon (The Climate Registry 2025). The estimated fuel usage from construction of the project is shown in Table 3.6-1.

Table 3.6-1. Total Proposed Project Construction Petroleum Demand Scenario
Off -Road
Equipment (diesel)
Haul Trucks
(diesel)
Vendor Trucks
(diesel)
Worker
Vehicles
(gasoline)
Gallons
Project Construction 58,192 3,444 1,156 3,594
Total Petroleum Consumed for Project Construction 66,386 Source: Appendix E, Energy Calculations.

In summary, construction associated with the development of the project is estimated to consume a total of approximately 66, 386 gallons of petroleum. The project would be subject to CARB ’s In-Use Off-Road Diesel Vehicle Regulation that applies to certain off -road diesel engines, vehicles, or equipment greater than 25 horsepower. The regulation (1) imposes limits on idling, requires a written idling policy, and requires a disclosure when se lling vehicles; (2) requires all vehicles to be reported to CARB (usi ng the Diesel Off - Road Online Reporting System) and labeled; (3) restricts the adding of older vehicles into fleets starting on January 1, 2014; and (4) requires fleets to reduce their emissions by retiring, replacing, or repowering older engines or installing Verified Diesel Emission Control Strategies (i.e., exhaust retrofits). The fleet must either show that its fleet average index was less than or equal to the calculated fleet average target rate, or that the fleet has met the Best Achievable Control Technology requirements.

Overall, while construction activities would consume petroleum -based fuels, consumption of such resources would be temporary and would cease upon the completion of construction. Further, the petroleum consumed related to construction would be typical of construction projects of similar types and sizes and would not necessitate new petroleum resources beyond what are typically consumed in California.

Therefore, because petroleum use during project construction would be temporary and minimal and would not be wasteful or inefficient, impacts would be less than significant .

Operational Energy Use
Once construction is complete, operation of the proposed project would involve routine maintenance activities performed by the City. The proposed park improvements would not expand the footprint of the park or result in a major expansion of facilities that would induce substantial demand or park users. Overall, the project would result in minimal energy consumption during operation.

Petroleum fuel consumption associated with motor vehicles is a function of the vehicle miles traveled (VMT) and fuel efficiency. Utilizing the same methodology for construction petroleum use, operation of the project would lead to an incremental increase of approximately 159 gallons of diesel and 720 gallons of gasoline

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per year for a total of 879 gallons of petroleum per year . By comparison, Los Angeles County consumed approximately 2.3 billion gallons of gasoline in 2022 (CEC 202 5a). The energy used for maintenance purposes would be minimal and would decrease over time, as staff vehicles and equipment become increasingly efficient, as there are numerous regulations in place that require and encourage increased fuel efficiency. For example, CARB has adopted a new approach to passenger vehicles by combining the control of smog-causing pollutants and greenhouse gas (GHG) emissions into a single coordinated package of standards. The new approach also includes efforts to support and accelerate the numbers of plug -in hybrids and zero-emission vehicles in California (CARB 2025e).

Electricity consumption from the operation of electric pumps would be approximately 86,585 kilowatt-hours (kWh) per year. For context, local electricity demand in Los Angeles County was approximately 68 billion kWh in 2022 (CEC 2025b). Overall, the increase in electricity demand would be minimal and would not be considered inefficient, wasteful, or unnecessary, and impacts would be less than significant. As such, the project’s operational energy use would be less than significant. b) Would the project conflict with or obstruct a state or local plan for renewable energy or energy efficiency? Less-than-Significant Impact. The project would be subject to and would comply with, at a minimum, the California Building Energy Efficiency Standards (24 CCR Part 6 and Part 11), where applicable. These energy efficiency standards are reviewed every 3 years by the Building Standards Commission and the California Energy Commission and are revised if necessary (PRC Section 25402[b][1]). Part 6 of Title 24 establishes energy efficiency standards for non-residential buildings constructed in California in order to reduce energy demand and consumption. Part 11 of Title 24 sets forth voluntary and mandatory energy measures that are applicable to the project under the California Green Building Standards. Overall, impacts related to the project’s potential to conflict with plans for renewable energy and energy efficiency would be less than significant.

3.7 Geology and Soils

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
VII. GEOLOGY AND SOILS – Would the project:
a) Directly or indirectly cause potential
substantial adverse effects, including the
risk of loss, injury, or death involving:

i) Rupture of a known earthquake fault,
as delineated on the most recent
Alquist-Priolo Earthquake Fault Zoning
Map issued by the State Geologist for
the area or based on other substantial
evidence of a known fault? Refer to
Division of Mines and Geology Special
Publication 42.

ii) Strong seismic ground shaking?

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Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
iii) Seismic-related ground failure, including
liquefaction?
iv) Landslides?
b) Result in substantial soil erosion or the loss
of topsoil?
c) Be located on a geologic unit or soil that is
unstable, or that would become unstable as
a result of the project, and potentially result
in on- or off-site landslide, lateral spreading,
subsidence, liquefaction or collapse?

d) Be located on expansive soil, as defined in
Table 18-1-B of the Uniform Building Code
(1994), creating substantial direct or
indirect risks to life or property?

e) Have soils incapable of adequately
supporting the use of septic tanks or
alternative waste water disposal systems
where sewers are not available for the
disposal of waste water?

f) Directly or indirectly destroy a unique
paleontological resource or site or unique
geologic feature?

a) Would the project directly or indirectly cause potential substantial adverse effects, including the risk of loss, injury, or death involving:
i) Rupture of a known earthquake fault, as delineated on the most recent Alquist-Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. and
ii) Strong seismic ground shaking?
Less-than-Significant Impact. The project site is located within a seismically active region, as is most of the Southern California region. The project would likely be exposed to seismic ground shaking at multiple points in the future. The intensity of ground shaking at any specific location within the region depends on the characteristics of the earthquakes, the distance from the earthquake epicenter, and the local geologic and soil conditions. Earthquake fault zones are delineated boundaries encompassing active faults that constitute potential hazards to structures from surface faulting or fault creep (DOC 2018).

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The project site is not located within an Alquist -Priolo Earthquake Fault Zone; the nearest faults are the Avalon-Compton Fault located approximately 2.9 miles east of the project site, the Cherry Hill Fault located approximately 3.1 miles east of the project site, and the Northeast Flank Fault located approximately 5.6 miles southeast of the project site (DOC 2025b). Although the project is not located within a delineated earthquake fault zone, it is located within a seismically active region. However, pro ject construction and operation would not increase or exacerbate the potential for fault rupture to occur. Therefore, the project would not directly or indirectly cause potential adverse effects involving rupture of a known earthquake fault, and impacts would be less than significant.
iii) Seismic-related ground failure, including liquefaction? Less-than-Significant Impact. Ground failure is a secondary effect of ground shaking and can include landslides, liquefaction, lurching, and differential settlement. Liquefaction is the loss of soil strength due to seismic forces generating various types of ground failure. Liquefaction occurs when saturated and poorly consolidated granular material is shaken during an earthquake and is transformed into a fluid-like state.

According to maps obtained through the California Department of Conservation and California Geological Survey, a majority of the site is not located in a liquefaction zone except for a small portion in the northeast corner of the park (DOC 2024b). The project’s geotechnical investigation determine that based on the soil types and densities encountered in borings , the potential for liquefaction and dynamic settlement at the site is considered low. Full project design would include engineering design standards associated with seismic events, including liquefaction. Standard design and construction techniques such as spread footings, mat foundations, or other design considerations would be incorporate d per California Building Code requirements, minimizing hazards due to liquefaction. Therefore, impacts would be less than significant .
iv) Landslides?
No Impact. Landslides typically occur on moderate to steep slopes that are affected by such physical factors as slope height, slope steepness, shear strength, and orientation of weak layers in the underlying geologic units. The project site and surroundings are generally flat with soils stabilized by development and landscaping. The project would not result in the creation of moderate to steep slopes that may become susceptible to landslides. As such, no impact would occur. b) Would the project result in substantial soil erosion or the loss of topsoil? Less-than-Significant Impact. Construction of the project would require earthwork activities that could potentially contribute to soil erosion or loss of topsoil. Construction of the project would result in more than 1 acre of land disturbance; therefore, a site -specific SWPPP in acc ordance with State Water Resources Control Board Order No. 2009 0008 DWQ, National Pollutant Discharge Elimination System General Permit No. CAS00002 (Construction General Permit), amended by Order No. 2010 -0014-DWQ and Order No. 2012-0006-DWQ, would be prepared and implemented during project construction. One of the purposes of the SWPPP is to address potential pollutants and their sources, including sources of sediment and site erosion. Conditions of these existing regulations wo uld include adherence to sediment and stormwater pollutant control BMPs, such as covering of exposed soil stockpiles, sediment barriers, storm drain protection, and various other measures designed to minimize potential for soil erosion and loss of

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topsoil. Disturbed areas would be returned to existing conditions or stabilized by new field replacement, asphalt, or landscape plantings. Operation of the proposed stormwater capture and treatment facility would not affect erosion. Therefore, the project would not result in substantial soil erosion of the loss of topsoil and impacts would be less than significant.
c) Would the project be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the project, and potentially result in on - or off-site landslide, lateral spreading, subsidence, liquefaction or collapse?
Less-than-Significant Impact. As previously discussed, the project site does not contain soils susceptible to liquefaction. Full project design would include continued geotechnical investigations to inform final design and construction of the project relative to minimization of potential geotechnical risks, including soil stability, per applicable California Building Code requirements. Therefore, the project would not exacerbate geotechnical hazards related to unstable soils and impacts would be less the significant. d) Would the project be located on expansive soil, as defined in Table 18 -1-B of the Uniform Building Code (1994), creating substantial direct or indirect risks to life or property? Less-than-Significant Impact. Expansive soils are clay-based and tend to increase in volume due to water absorption and decrease in water volume due to drying. Full project design would include continued geotechnical investigations including sampling and analysis of soils on site. If such conditions are encountered, the project would employ standard engineering protocols to limit the potential effects on project-related infrastructure. Therefore, impacts would be less than significant. e) Would the project have soils incapable of adequately supporting the use of septic tanks or alternative waste water disposal systems where sewers are not available for the disposal of waste water? No Impact. The project would not involve the use of septic tanks or alternative wastewater disposal systems. Therefore, no impact would occur.
f) Would the project directly or indirectly destroy a unique paleontological resource or site or unique geologic feature?
Less-than-Significant Impact with Mitigation. Paleontological resources are the remains or traces of plants and animals that are preserved in Earth’s crust, and per the Society of Vertebrate Paleontology (SVP 2010) guidelines, are older than written history or older than approximately 5,000 years, which approximates the middle Holocene. They are limited, nonrenewable resources of scientific and educational value, which are afforded protection under state laws and regulations.

According to surficial geologic mapping by Dibblee et al. (1999) at a scale of 1:24,000 and by Saucedo et al. (2016) at a scale of 1:100,000, and the geologic time scale of Cohen et al. (2024), the project site is underlain by late Holocene (present to 4,200 years ago) alluvium (map unit Qa) and early Holocene (8,200 to 11,700 years ago) alluvium that has been slightly elevated and dissected (map unit Qae). Saucedo et al. (2016) shows the area underlain by early Holocene to late Pleistocene (8,200 to 129,000 years ago) young alluvial fan deposits, undivided (map unit Qyf) and late Pleistocene (11,700 to 129,000 years ago) old alluvium, undivided (map unit Qoa). Geotechnical borings conducted by Ninyo & Moore (2025) show

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alluvium underlying fill . At approximately 7.5 feet below ground surface, small amounts of caliche were encountered within several boreholes, which may be an indicator of older (e.g., Pleistocene age) sediments.

Fill was generally encountered to a depth of approximately 2.5 feet and up to 6 feet below the ground surface (bgs) in one borehole. The retention basin has an anticipated excavation of up to 20 feet bgs, pipelines up to 10 feet of excavation, and bioswales up to 5 feet of excavation (Ninyo & Moore 2025).

Dudek requested a paleontological records search from the Natural History Museum of Los Angeles County (NHMLA) on December 6, 2024, and the results were received on March 9, 2025. The NHMLA reported no vertebrate fossil localities from within the proposed project site; however, they did nearby localities from similar sediments that likely underlie the project site on the surface and at depth. Nearby localities reported by the NHMLA are as follows (closest locality listed first) : LACM VP 4129, approximately 1.15 miles southeast of the project site, yielded a camel and a proboscidean (e.g., mammoths and mastodons) from 24 feet bgs; LACM VP 3319, approximately 1.73 miles northeast of the project site, produced a mammoth from 30 feet bgs; LACM IP 4788/4806/20338, approximately 2.22 miles southwest of the project site, yielded invertebrates; and LACM IP 21125, approximately 2.93 miles northwest of the project site, produced invertebrates. All localities were found in Pleistocene age s edimentary deposits (unnamed Quaternary sedimentary deposits and the San Pedro Formation ( NHMLA 2025- Confidential Appendix F).

The San Pedro Formation likely underlies the project site at an undetermined depth bgs.

A search of online paleontological databases and previous localities reported for other projects in the area produced three nearby localities, all from the Palos Verdes Sand, which is not anticipated to be impacted based on anticipated construction plans for the project . Fossil locality LACM IP 129, approximately 2.01 miles south/southwest, produced invertebrates from 20 feet bgs; LACM VP 3085 and LACM IP 77, approximately 2.31 miles southwest, included fish, rays, a toothed whale, and invertebrates ; CIT 48 4, approximately 2.84 miles northwest, produced a fossil seal (PBDB 2025; NHMLA 2025).

No paleontological resources were identified within the project site as a result of the institutional records search or desktop geological and paleontological review. In addition, the project site is not anticipated to be underlain by unique geologic features. Areas of the project site underlain by Holocene age deposits have low paleontological sensitivity increasing to high sensitivity with dep th, where middle Holocene and Pleistocene age deposits have high paleontological sensitivity. If intact paleontological resources are discovered on site, ground -disturbing activities associated with construction of the project have the potential to destroy a unique paleontological resource or site. As such, the project site is considered to be potentially sensitive for paleontological resources, and without mitigation, the potential damage to paleontological resources during construction associated with the project is considered a potentially significant impact. With the implementation of MM-GEO-1, impacts would be reduced to a less -than- significant level.

MM-GEO-1 Prior to commencement of any grading activity on site, the City shall retain a qualified paleontologist per the Society of Vertebrate Paleontology (SVP) (2010) guidelines. The paleontologist shall prepare a Paleontological Resources Impact Mitigation Program (PRIMP) for the project. The PRIMP shall be consistent with the SVP (2010) guidelines and should outline requirements for preconstruction meeting attendance and worker environmental awareness training; where monitoring is required within the pr oposed project site based on construction plans and/or geotechnical reports; procedures for adequate paleontological monitoring and discoveries treatment; and paleontological

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methods (including sediment sampling for microvertebrate fossils), reporting, and collections management. The qualified paleontologist shall attend the preconstruction meeting and a qualified paleontological monitor shall be on site during all rough grading and other significant ground -disturbing activities (including augering ) in previously undisturbed, middle Holocene and Pleistocene age alluvial deposits. In the event that paleontological resources (e.g., fossils) are unearthed during grading, the paleontological monitor will temporarily halt and/or divert grading activity to allow recovery of paleontological resources. The area of discovery will be roped off with a 50 -foot radius buffer. Once documentation and collection of the find is completed, the monitor will remove the rope and allow grading to recommence in the area of the find.

3.8 Greenhouse Gas Emissions

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
VIII. GREENHOUSE GAS EMISSIONS – Would the project:
a) Generate greenhouse gas emissions, either
directly or indirectly, that may have a
significant impact on the environment?

b) Conflict with an applicable plan, policy or
regulation adopted for the purpose of
reducing the emissions of greenhouse
gases?

a) Would the project generate greenhouse gas emissions, either directly or indirectly, that may have a significant impact on the environment?
Less-than-Significant Impact. GHGs are those that absorb infrared radiation (i.e., trap heat) in the Earth’s atmosphere. The trapping and buildup of heat in the atmosphere near the Earth’s surface (the troposphere) is referred to as the “greenhouse effect” and is a natural process that contributes to the regulation of the Earth’s temperature, creating a livable environment on Earth. The Earth’s temperature depends on the balance between energy entering and leaving the planet’s system, and many factors (natural and human) can cause changes in Earth ’s energy balance. Human activities that generate and emit GHGs in to the atmosphere increase the amount of infrared radiation that gets absorbed before escaping into space, thus enhancing the greenhouse effect and causing the Earth ’s surface temperature to rise. This rise in temperature has led to large -scale changes to the Earth ’s system (e.g., temperature, precipitation, wind patterns), which are collectively referred to as climate change. Global climate change is a cumulative impact; a project contributes to this impact through its incremental contribution combined wit h the cumulative increase of all other sources of GHGs. Thus, GHG impacts are recognized exclusively as cumulative impacts (CAPCOA 2008).

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As defined in California Health and Safety Code Section 38505(g) for purposes of administering many of the state’s primary GHG emissions reduction programs, GHGs include CO 2, methane (CH 4), nitrous oxide (N2O), hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, and nitrogen trifluoride (see also CEQA Guidelines Section 15364.5). The primary GHGs that would be emitted by project-related construction and operations include CO2, CH4, and N2O.9
The Intergovernmental Panel on Climate Change developed the global warming potential (GWP) concept to compare the ability of each GHG to trap heat in the atmosphere relative to another gas. The reference gas used is CO2; therefore, GWP-weighted emissions are measured in MT of CO2 equivalent (CO2e). The current version of CalEEMod assumes that the GWP for CH 4 is 25 (so emissions of 1 MT of CH 4 are equivalent to emissions of 25 MT of CO2), and the GWP for N2O is 298, based on the Intergovernmental Panel on Climate Change’s Fourth Assessment Report (IPCC 2007).

Section 15064.7(c) of the CEQA Guidelines specifies that “when adopting thresholds of significance, a lead agency may consider thresholds of significance previously adopted or recommended by other public agencies, or recommended by experts, provided the decision of the lead agency to adopt such thresholds is supported by substantial evidence.” The CEQA Guidelines do not prescribe specific methodologies for performing an assessment, establish specific thresholds of significance, or mandate specific mitigatio n measures. Rather, the CEQA Guidelines emphasize the lead agency ’s discretion to determine the appropriate methodologies and thresholds of significance that are consistent with the manner in which other impact areas are handled in CEQA (CNRA 2009).

As discussed in Section 3.3, Air Quality, the proposed project is located within the jurisdictional boundaries of the SCAQMD. In October 2008, the SCAQMD proposed recommended numeric CEQA significance thresholds for GHG emissions for lead agencies to use in assessing GHG impacts of residential and commercial development projects as presented in its Draft Guidance Document—Interim CEQA Greenhouse Gas (GHG) Significance Threshold (SCAQMD 2008b). This document, which builds on the California Air Pollution Control Officers Association’s previous guidance, explored various approaches for establishing a significance threshold for GHG emissions. The draft interim CEQA thresholds guidance document was not adopted or approved by the Governing Board. However, in December 2008, the SCAQMD adopted an interim 10,000 MT CO 2e per-year screening level threshold for stationary source/industrial projects for which the SCAQMD is the lead agency (SCAQMD 2010). The 10,000 MT CO 2e per-year threshold, which was derived from GHG reduction targets established in Executive Or der S -3-05, was based on the conclusion that the threshold was consistent with achieving an emissions capture rate of 90% of all new or modified stationary source projects.

The SCAQMD formed a GHG CEQA Significance Threshold Working Group to work with SCAQMD staff on developing GHG CEQA significance thresholds until statewide significance thresholds or guidelines are established. From December 2008 to September 2010, the SCAQMD hosted working group meetings and revised the draft threshold proposal several times, although it did not officially provide these prop osals in a subsequent document. The SCAQMD has continued to consider adoption of significance thresholds for residential and general land use development projects. The most recent proposal issued by SCAQMD,

9 Emissions of hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, and nitrogen trifluoride are generally associated with industrial activities, including the manufacturing of electrical components and heavy-duty air conditioning units and the insulation of electrical transmission equipment (substations, power lines, and switch gears). Therefore, emissions of these GHGs were not evaluated or estimated in this analysis because the project would not include these activities or components and would not generate hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, or nitrogen trifluoride in measurable quantities.

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issued in September 2010, uses the following tiered approach to evaluate potential GHG impacts from various uses (SCAQMD 2010):

Tier 1. Determine if CEQA categorical exemptions are applicable. If not, move to Tier 2.

Tier 2. Consider whether or not the proposed project is consistent with a locally adopted GHG reduction plan that has gone through public hearing and CEQA review, that has an approved inventory, includes monitoring, etc. If not, move to Tier 3.

Tier 3. Consider whether the project generates GHG emissions in excess of screening thresholds for individual land uses. The 10,000 MT CO 2e per -year threshold for industrial uses would be recommended for use by all lead agencies. Under option 1, separate screening thresholds are proposed for residential projects (3,500 MT CO2e per year), commercial projects (1,400 MT CO 2e per year), and mixed -use projects (3,000 MT CO 2e per year). Under option 2, a single numerical screening threshold of 3,000 MT CO2e per year would be used for all non-industrial projects. If the project generates emissions in excess of the applicable screening threshold, move to Tier 4.

Tier 4. Consider whether the project generates GHG emissions in excess of applicable performance standards for the project service population (population plus employment). The efficiency targets were established based on the goal of AB 32 to reduce statewide GHG e missions to 1990 levels by 2020. The 2020 efficiency targets are 4.8 MT CO 2e per -service population for project -level analyses and 6.6 MT CO 2e per-service population for plan-level analyses. If the project generates emissions in excess of the applicable efficiency targets, move to Tier 5.

Tier 5. Consider the implementation of CEQA mitigation (including the purchase of GHG offsets) to reduce the project efficiency target to Tier 4 levels.

To determine the proposed project ’s potential to generate GHG emissions that would have a significant impact on the environment, its GHG emissions were compared to the SCAQMD 3,000 MT CO 2e per year screening threshold recommended for non-industrial projects.

Construction Emissions
Construction of the project would result in GHG emissions, which are primarily associated with off -road construction equipment, on-road haul and vendor trucks, and worker vehicles. The SCAQMD recommends that “construction emissions be amortized over a 30-year project lifetime, so that GHG reduction measures will address construction GHG emissions as part of the operational GHG reduction strategies” (SCAQMD 2008b). CalEEMod was used to calculate the annual GHG emissions based on the construction scenario described in Section 3.3, Air Quality. Table 3.8-1 presents the GHG emissions resulting from construction of the project. For further detail on the assumptions and results of this analysis, please refer to Appendix A, Air Quality and Greenhouse Gas Modeling.

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Table 3.8-1. Estimated Annual Construction Greenhouse Gas Emissions Year
CO 2 CH 4 N2O R CO 2e
Metric Tons
2026 183.32 0.01 <0.01 0.02 184.61
2027 489.34 0.02 0.01 0.07 492.81
Total 677.42
Amortized Construction Emissions (Over 30-Years) 22.58
Source: Appendix A, Air Quality and Greenhouse Gas Modeling.

Notes: CO2 = carbon dioxide; CH4 = methane; N2O = nitrous oxide; R = refrigerants; CO2e = carbon dioxide equivalent; 0.01 = value is less than 0.005.

Totals may not sum due to rounding.

As shown in Table 3.8-1, the estimated total GHG emissions during construction would be approximately 677 MT CO 2e. Estimated project -generated construction emissions amortized over 30 years would be approximately 23 MT CO 2e per year. In addition, as with project -generated construction criteria air pollutant emissions, GHG emissions generated during proposed construction activities would be short term, lasting only for the duration of the construction period, and would not represent a l ong-term source of GHG emissions.

Operational Emissions
Once construction is complete, project operation is anticipated to entail routine maintenance performed at the stormwater capture facility and other park features. Reservoir maintenance would entail removal of debris and pollutant constituents from the treatment devices, pump testing and calibration, and cleaning the storage reservoir. During long-term operations, the project would generate GHG emissions from mobile sources, including two maintenance workers accessing the site, and energy sources, including one electric pump to pump stormwater and one electric pump to assist the existing irrigation system. The electric pumps would consume approximately 86,585 kWh of electricity per year. The electric pumps were modeled as off- road equipment in CalEEMod, and the GHG emissions associated with their use were accounted for as an Energy source.

Table 3.8-2 presents the GHG emissions resulting from operation of the project. For further detail on the assumptions and results of this analysis, please refer to Appendix A , Air Quality and Greenhouse Gas Modeling.

Table 3.8-2. Estimated Annual Operational Greenhouse Gas Emissions Emissions Source
CO 2 CH 4 N2O R CO 2e
Metric Tons
Mobile 7.95 <0.01 <0.01 0.01 8.05
Energy 13.60 <0.01 <0.01 N/A 13.68
Total Operational Emissions 21.73
Amortized Construction Emissions 22.58
Total 44.31
SCAQMD Threshold 3,000

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Table 3.8-2. Estimated Annual Operational Greenhouse Gas Emissions Emissions Source
CO 2 CH 4 N2O R CO 2e
Metric Tons
Exceeds Threshold? No
Source: Appendix A, Air Quality and Greenhouse Gas Modeling.

Notes: CO2 = carbon dioxide; CH4 = methane; N2O = nitrous oxide; R = refrigerants; CO2e = carbon dioxide equivalent; 0.01 = value is less than 0.005.

Totals may not sum due to rounding.

As shown in Table 3.8-2, the project would not exceed the SCAQMD threshold of 3,000 MT CO2e per year.

Projects below this significance criterion have a minimal contribution to global GHG emissions and are considered to have less-than-significant impacts. Therefore, operational impacts associated with directly or indirectly generating a significant quantity of GHG emissions would be less than significant. b) Would the project generate conflict with an applicable plan, policy or regulation adopted for the purpose of reducing the emissions of greenhouse gases?
Less-than-Significant Impact. Applicable plans for the project site include SCAG’s 2024–2050 RTP/SCS, CARB’s 2017 and 2022 Scoping Plan Updates to address Senate Bill (SB) 32 and AB 1279, and the 2017 City of Carson Climate Action Plan (CAP). Each of these plans is described below along with an analysis of the proposed project’s potential to conflict with the related GHG emission reduction goals.

Project Consistency with SCAG ’s 20 24-2050 RTP/SCS
On April 4, 2024, SCAG adopted the 2024 –2050 RTP/SCS, also referred to as Connect SoCal 2024.

Connect SoCal 2024 builds on the prior RTP/SCS and identifies the following strategy areas to support its environmental goals: Sustainable Development, Air Quality, Clean Transportation, Natural and Agricultural Lands Preservation, and Climate Resilience (SCAG 2024). The primary objective of the 2024 –2050 RTP/SCS is to provide guidance for future regional growth (i.e., the location of new residential and non - residential land uses) and transportation patterns throughout the region, as stipulated under SB 375. Given that the proposed project involves the renovation of an existing park and the construction of a stormwater capture and treatment facility, the goals and s trategies of the 2024–2050 RTP/SCS are not directly applicable. As such, the proposed project would not conflict with the goals and policies of the 2024–2050 RTP/SCS and impacts would be less than significant.

Project Consistency with State Reduction Targets and CARB ’s Scoping Plan s The California State Legislature passed the Global Warming Solutions Act of 2006 (Assembly Bill [AB] 32) to provide initial direction to limit California’s GHG emissions to 1990 levels by 2020 and initiate the state’s long-range climate objectives. Since the passage of AB 32, the state has adopted GHG emissions reduction targets for future years beyond the initial 2020 horizon year. For the proposed project, the relevant GHG emissions reduction targets include those established by SB 32 and AB 1279, which r equire GHG emissions be reduced to 40% below 1990 levels by 2030, and 85% below 1990 levels by 2045, respectively. In addition, AB 1279 requires the state achieve net zero GHG emissions by no later than 2045 and achieve and maintain net negative GHG emissions thereafter.

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As defined by AB 32, CARB is required to develop the Scoping Plan, which provides the framework for actions to achieve the state ’s GHG emission targets. The Scoping Plan is required to be updated every 5 years and requires CARB and other state agencies to adopt regulations and initiatives that will reduce GHG emissions statewide. The first Scoping Plan was adopted in 2008, and it was updated in 2014, 2017, and most recently in 2022. Although the Scoping Plan is not directly applicable to specific projects, nor is it intended to be used for project -level evaluations,10 it is the official framework for the measures and regulations that will be implemented to reduce California’s GHG emissions in alignment with the adopted targets. Therefore, a project would be found to not conflict with the statutes if it would meet the Scoping Plan policies and would not impede attainment of the goals therein.

CARB’s 2017 Scoping Plan update was the first to address the state’s strategy for achieving the 2030 GHG reduction target set forth in SB 32 (CARB 2017); the most recent CARB 2022 Scoping Plan update outlines the state’s plan to reduce emissions and achieve carbon neutrality by 2045 in alignment with AB 1279 and assesses progress toward the 2030 SB 32 target (CARB 2022). As such, given that SB 32 and AB 1279 are the relevant GHG emission targets, the 2017 and 2022 Scoping Plan updates are the most applicable to the proposed project.

The 2017 Climate Change Scoping Plan Update included measures to promote renewable energy and energy efficiency (including the mandates of SB 350), measures to increase stringency of the Low Carbon Fuel Standard, measures identified in the Mobile Source and Freight Strategies, measures identified in the proposed Short-Lived Climate Pollutant Plan, and measures to increase stringency of SB 375 targets. The 2022 Scoping Plan for Achieving Carbon Neutrality builds upon and accelerates programs currently in place, including moving to zero-emission transportation; phasing out use of fossil gas use for heating homes and buildings; reducing chemical and refrigerants with high GWP; providing communities with sustainable options for walking, biking, and public transi t; and displacement of fossil fuel fired electrical generation through use of renewable energy alternatives (e.g., solar arrays and wind turbines) (CARB 2022).

Many of the measures and programs included in the Scoping Plan would result in the reduction of project-related GHG emissions with no action required at the project -level, including GHG emission reductions through increased energy efficiency and renewable energy production (SB 350), reduction in carbon intensity of transportation fuels (Low Carbon Fuel Stand ard), and the accelerated efficiency and electrification of the statewide vehicle fleet ( Mobile Source Strategy). Given that the proposed project is also not anticipated to result in substantial increase in mobile trips, the project would also not conflict with the 2017 update’s goal of reducing GHG emissions through reductions in VMT statewide.

The 2045 carbon neutrality goal required CARB to expand proposed actions in the 2022 update to include those that capture and store carbon in addition to those that reduce anthropogenic sources of GHG emissions. The proposed project would support the state ’s carbon neutrality goals, as implementation includes addition of urban trees and native plantings throughout the project site, which represent opportunities for potential carbon removal and sequestration over the project lifetime. However, the 2022 update emphasizes that reliance on carbon sequestration in the state’s natural and working lands will not be sufficient to address residual GHG emissions, and achieving carbon neutrality will require research,

10 The Final Statement of Reasons for the amendments to the CEQA Guidelines reiterates the statement in the Initial Statement of Reasons that “the Scoping Plan may not be appropriate for use in determining the significance of individual projects because it is conceptual at this stage and relies on the future development of regulations to implement the strategies identified in the Scoping Plan” (CNRA 2009).

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development, and deployment of additional methods to capture atmospheric GHG emissions (e.g., mechanical direct air capture). Given that the specific path to neutrality will require development of technologies and programs that are not currently known or a vailable, the project’s role in supporting the statewide goal would be speculative and cannot be wholly identified at this time.

Overall, the proposed project would comply with all regulations adopted in furtherance of the Scoping Plan to the extent applicable and required by law. As mentioned above, several Scoping Plan measures would result in reductions of project-related GHG emissions with no action required at the project-level, including those related to energy efficiency, reduced fossil fuel use, and renewable energy production. As demonstrated above, the proposed project would not conflict with CARB ’s 2017 or 2022 Scoping Pla n updates or with the state ’s ability to achieve the 2030 and 2045 GHG reduction and carbon neutrality goals.

Project Consistency with City of Carson Climate Action Plan The South Bay Cities Council of Governments developed the City of Carson CAP in December 2017, which outlines a comprehensive strategy to address climate change and promote sustainability within the community. The CAP identifies key areas to support its goals , Land Use and Transportation, Energy Efficiency, Solid Waste, Urban Greening, and Energy Generation and Storage. The primary objectives of the CAP are to reduce GHG emissions, enhance community and neighborhood sustainability, promote zero - emission vehicles, advance energy and water efficiency, reduce waste, transform built environments into green spaces, and support renewable energy and storage. Given that the proposed project involves the construction of a stormwater capture and treatment facility and improvements to an existing park, many of the goals and strategies of the CAP are not directly applicable. However, the project would support the goals related to community and neighborhood sustainability and water efficiency through the stormwater capture and treatment facility and park improvements. As such, the proposed project would not conflict with the goals and policies of the CAP, and impacts would be less than significant.

Based on the preceding considerations, the proposed project would not conflict with any applicable plan, policy, or regulation of an agency adopted for the purpose of reducing GHG emissions, and impacts would be less than significant.

3.9 Hazards and Hazardous Materials

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
IX. HAZARDS AND HAZARDOUS MATERIALS – Would the project:
a) Create a significant hazard to the public or
the environment through the routine
transport, use, or disposal of hazardous
materials?

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Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
b) Create a significant hazard to the public or
the environment through reasonably
foreseeable upset and accident conditions
involving the release of hazardous materials
into the environment?

c) Emit hazardous emissions or handle
hazardous or acutely hazardous materials,
substances, or waste within one-quarter
mile of an existing or proposed school?

d) Be located on a site that is included on a list
of hazardous materials sites compiled
pursuant to Government Code Section
65962.5 and, as a result, would it create a
significant hazard to the public or the
environment?

e) For a project located within an airport land
use plan or, where such a plan has not been
adopted, within two miles of a public airport
or public use airport, would the project
result in a safety hazard or excessive noise
for people residing or working in the project
area?

f) Impair implementation of or physically
interfere with an adopted emergency
response plan or emergency evacuation
plan?

g) Expose people or structures, either directly
or indirectly, to a significant risk of loss,
injury or death involving wildland fires?

a) Would the project create a significant hazard to the public or the environment through the routine transport, use, or disposal of hazardous materials?
Less-than-Significant Impact. Relatively small amounts of commonly used hazardous substances such as gasoline, diesel fuel, lubricating oil, adhesive materials, grease, solvents, and architectural coatings would be used during construction. Operation and maintenance of the project wou ld also require routine use of common hazardous substances. These materials are used routinely throughout urban environments for construction projects and operation of utility infrastructure. These materials would be transporte d and handled in accordance with all federal, state, and local laws regulating the management and use of hazardous materials. Consequently, use of these materials for their intended purpose would not pose a significant risk to the public or environment. Wi th adherence to state and local regulations, impacts associated with routine transport, use, and disposal of hazardous materials would be less than significant.

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b) Would the project create a significant hazard to the public or the environment through reasonably foreseeable upset and accident conditions involving the release of hazardous materials into the environment?
Less-than-Significant Impact. As discussed under Section 3.9(a) , Hazards and Hazardous Materials , construction and operation would involve relatively small amounts of commonly used hazardous substances such as gasoline, diesel fuel, lubricating oil, grease, adhesive materials, and solvents. These materials are not considered acutely hazardous and are used routinely throughout urban environments for both construction and operation of projects. Further, these materials would be transported, handled, and disposed of in accordance with all federal, state, and local laws regulating the management of, spill prevention, and spill response, related to, hazardous materials. Impacts would be less than significant. c) Would the project emit hazardous emissions or handle hazardous or acutely hazardous materials, substances, or waste within one-quarter mile of an existing or proposed school? Less-than-Significant Impact. Two schools are located within 0.25 miles of the project site. This includes Carnegie Middle School, located at 21820 Bonita Street, adjacent to the project site’s northern boundary along East 220th Street and Bonita Elementary School, located at 21929 Bonita Street , adjacent to the project site’s western boundary along Bonita Street. Construction and operation of the project would involve relatively small amounts of commonly used hazardous substances such as gasoline, diesel fuel, lubricating oil, grease, adhesive materials, and solvents. These materials are used routinely throughout urban environments for construction projects and would not pose a significant risk to the public or environment.

Additionally, these materials would be transported and handled in accordance with all federal, st ate, and local laws regulating the management and use of hazardous materials. Additionally, a construction HRA was performed for the project, which demonstrates that the TAC exposure from construction diesel exhaust emissions would not result in cancer risk above the 10 in 1 million threshold or a Chronic Hazard Index more than 1 for school children at Bonita Street Elementary School and Carnegie Middle School (see Table 3.3-7). As such, impacts would be less than significant. d) Would the project be located on a site that is included on a list of hazardous materials sites compiled pursuant to Government Code Section 65962.5 and, as a result, would it create a significant hazard to the public or the environment?
No Impact. According to the California Department of Toxic Substances Control EnviroStor database , no sites or facilities are located within or adjacent to the project site. The nearest identified active site is Gardena Valley Landfill No. 6 , a Voluntary Cleanup Site, located approximately 0. 75 miles north of the project site (DTSC 202 5). Other state and local government agencies are required to provide additional hazardous materials release information for the Cortese List. The State Water Resources Control Board GeoTracker database identifies leaking underground storage tanks, waste discharge sites, oil and gas sites, and other waste or cleanup sites. A review of GeoTracker did not identify any sites or facilities within or adjacent to the project site. The nearest identified site with open-site assessment status is the Dominguez Channel at Carson Street (ID No. T100000 03058) a Cleanup Program Site, located approximately 0. 22 miles northeast of the project site (SWRCB 2025). These hazardous materials sites are located at adequate distances from the project site such that they would be of no concern to present a worker hazard for construction crews. Therefore, no impact would occur.

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e) For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project result in a safety hazard or excessive noise for people residing or working in the project area? No Impact. The project site is approximately 4.2 miles south of the Compton/Woodley Airport, 5 miles northeast of the Torrance Municipal Airport, 5.4 miles west of the Long Beach Airport, 7.6 miles south of the Hawthorne Municipal Airport, and 10.5 miles southeast of the Los Angeles International Airport. The project site does not fall within the airport land use plan for these airports. The project is not located within 2 miles of a public use airport. Therefore, no impact would occur. f) Would the project impair implementation of or physically interfere with an adopted emergency response plan or emergency evacuation plan?
Less-than-Significant Impact. The City has prepared a Draft Hazard Mitigation Plan. The hazard mitigation plan is a document that contains information to assist communities in reducing risk from hazards by identifying resources, information, and strategies for risk reduction (City of Carson 2024). A stormwater diversion structure would be constructed to connect the proposed system to existing storm drains under East 220th Street and Bonita Street. Additionally, an underground storage reservoir installed beneath the baseball/softball and soccer outfields at Calas Park would be connected directly to the diversion pipeline and an outflow pipeline for sending water back into an existing catch basin beneath East 220th Street. As such, project construction would require the temporary partial closures of East 220 th Street and small portion of Bonita Street. The temporary partial closures of East 220th Street and Bonita Street would be performed pursuant to a traffic control plan prepared by the contractor and subject to City approval, which would demonstrate that emergency access or evacuation woul d not be impeded. Traffic on East 220th Street and Bonita Street would resume to existing conditions upon completion of the project. Impacts would be less than significant.
g) Would the project expose people or structures, either directly or indirectly, to a significant risk of loss, injury or death involving wildland fires?
No Impact. According to the California Department of Forestry and Fire Protection (CAL FIRE), The project site is located within a Local Responsibility Area and is not located within a Very High Fire Hazard Severity Zone (CAL FIRE 2024). The nearest Very High Fire Hazard Severity Zone is located approximately 4.7 miles southwest of the project site. In the event of an emergency, fire response services for the project are provided by the Los Angeles Couty Fire Department. Construction and operation of the project would comply with Article III, Chapter 1 of the City’s Municipal Code, which adopts the Los Angeles County Fire Code by reference. The project would not include structures intended for long -term occupancy or include development that could exacerbate fire risk. Furthermore, the project site is relatively flat and the proposed project would not alter land on the project site; therefore it would not influence prevailing winds or other factors that could exacerbate wildfire risk. As such, people and struc tures would not be exposed to a significant risk of loss, injury, or death involving wildfires. No impact would occur.

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3.10 Hydrology and Water Quality

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
X. HYDROLOGY AND WATER QUALITY – Would the project:
a) Violate any water quality standards or waste
discharge requirements or otherwise
substantially degrade surface or ground
water quality?

b) Substantially decrease groundwater
supplies or interfere substantially with
groundwater recharge such that the project
may impede sustainable groundwater
management of the basin?

c) Substantially alter the existing drainage
pattern of the site or area, including through
the alteration of the course of a stream or
river or through the addition of impervious
surfaces, in a manner which would:

i) result in substantial erosion or siltation
on- or off-site;
ii) substantially increase the rate or
amount of surface runoff in a manner
which would result in flooding on- or off
site;

iii) create or contribute runoff water which
would exceed the capacity of existing or
planned stormwater drainage systems
or provide substantial additional
sources of polluted runoff; or

iv) impede or redirect flood flows?
d) In flood hazard, tsunami, or seiche zones,
risk release of pollutants due to project
inundation?

e) Conflict with or obstruct implementation of
a water quality control plan or sustainable
groundwater management plan?

a) Would the project violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality?
Less-than-Significant Impact. The project site is located within the boundaries of the DC WMG. The DC WMG EWMP outlines the water quality objectives, and includes measures to reduce discharge pollutants, and protect and improve the Dominguez Channel water bodies (DC WMG 2016).

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Construction of the project would involve ground -disturbing activities for grading that could result in sediment discharge in stormwater runoff. Additionally, construction would involve the use of oil, lubricants, and other chemicals that could be discharged from leaks or accidental spills. These potential sediment and chemical discharges during construction would have the potential to impact water quality in receiving water bodies. However, because the project would disturb over 1 acre of land, the project would be required to prepare and implement a SWPPP, which would include water quality BMPs to ensure that water quality standards are met and that runoff from the construction work areas does not cause degradation of water quality in receiving water bodie s. Through the incorporation of BMPs through implementation of SWPPP requirements, impacts associated with water quality standards during construction would be less than significant.

The project is a result of the Stipulated Order, which is in response to violations occurring from the discharge of untreated wastewater into the Dominguez Channel. The project would decrease the amount of pollutants in stormwater and dry-weather runoff entering the Dominguez Channel, helping to achieve EWMP goals and MS4 permit compliance. Upon operation, existing stormwater flows would be diverted and treated prior to infiltration and/or discharge, resulting in water quality benefits compared to existing conditions. Ong oing maintenance and sampling would ensure that the project is performing as expected in terms of treatment of stormwater. Therefore, impacts during operation would be less than significant. b) Would the project substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin? Less-than-Significant Impact. Groundwater was measured at a depth of approximately 28 feet for borings taken as part of the project’s geotechnical investigation (Ninyo & Moore 2025). The project would include the installation of an underground storage reservoir that would connect to existing storm drains to collect stormwater. would facilitate infiltration of captured stormwater, allowing water to seep into the underlying aquifer and providing natural filtration through the soil. In this way, the project would increase groundwater recharge in areas under the park. The project would not otherwise result in a substantial change in impervious surfaces that would affect groundwater infiltration because the proposed park rehabilitation would replace all existing amenities with improved features that would not substantially alter the amount of impervious surface and would be consistent with the existing uses and conditions at the park.

Additionally, the project would not entail temporary or permanent use of groundwater and, thus, would not deplete groundwater within the project vicinity. Therefore, the project would not substantially decrease groundwater supplies or interfere substantially with groundwater recharge; impacts would be less than significant.
c) Would the project substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river or through the addition of impervious surfaces, in a manner which would:
i) Result in substantial erosion or siltation on- or off-site? and
ii) Substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or off site?

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and
iii) Create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff? and
iv) Impede or redirect flood flows?
Less-than-Significant Impact. The project would not substantially alter existing drainage patterns, including streams or river courses. Construction of the project would entail temporary earthwork to excavate and install the storage reservoir and associated infrastructure. Implementation of the project -specific SWPPP, including BMPs, would prevent substantial erosion and siltation of exposed soils during construction activities. Once construction of the stormwater infrastructure is complete, the park facili ties would be replaced with enhanced facilities to serve the needs of park visitors.

In operation, the intent of the project is to capture and divert stormwater flows, which would be directed to the underground system and therefore would not result in substantial erosion, siltation, or runoff. Operation of the stormwater infrastructure would improve the stormwater system because it would improve storage and filtration capabilities, which would reduce pollution of stormwater runoff. The project would not result in a substantial change in impervious surfaces within the project site because th e proposed park rehabilitation would include the replacement of existing features with similar, enhanced park features.

Therefore, implementation of the project would not substantially alter the existing drainage pattern of the site or area in a way that w ould cause substantial erosions, flooding, polluted runoff, or changes to flood flows. Impacts would be less than significant.
d) In flood hazard, tsunami, or seiche zones, would the project risk release of pollutants due to project inundation?
No Impact. According to Federal Emergency Management Agency flood maps, the project site is located in a Flood Zone X. The western portion of the project site is mapped as an “area of minimal flood hazard” and the eastern portion of the site is mapped as an “Area with reduced flood risk due to levee (FEMA 2008).

Additionally, the project site is not located within a tsunami inundation zone and seiches do not pose a hazard to the project site (DOC 2025c). The project would include the construction of a stormwater capture and treatment facility, which would improve the water quality of the Dominguez Channel Estuary. As discussed in Section 3.10(a), Hydrology and Water Resources, the project would prepare a SWPPP, which would include water quality BMPs to ensure that water quality standards are met and that runoff from the construction work areas would not cause degradation of water quality in receiving water bodies. Upon completion of construction, the projec t would not require the storage of pollutants that, in the event of inundation, could be released. A pump would be installed to pump stormwater back to the storm drain system during low flow conditions and discharging into the Dominguez Channel , similar to existing flow conditions except the stormwater flow would be pre-treated. Therefore, no impact associated with the risk of release of pollutants due to project inundation in a flood hazard, tsunami, or seiche zone would occur. e) Would the project conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan?
Less-than-Significant Impact. As discussed in greater detail in Chapter 1, Introduction, the proposed project is a result of the Stipulated Order, which is in response to violations occurring from the discharge of

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untreated wastewater into the Dominguez Channel . The project would include runoff storage and water quality benefits for the City and other DC WMG members, helping to achieve EWMP goals and MS4 permit compliance. As such, the project would implement the applicable water quality control plan for the region.

As discussed previously, the project would allow for infiltration into the underlying soils and would not interfere with groundwater supplies. Therefore, the project would not conflict with a water qualit y control plan or sustainable groundwater management plan and impacts would be less than significant.

3.11 Land Use and Planning

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
XI. LAND USE AND PLANNING – Would the project:
a) Physically divide an established
community?
b) Cause a significant environmental
impact due to a conflict with any land use
plan, policy, or regulation adopted for the
purpose of avoiding or mitigating an
environmental effect?

a) Would the project physically divide an established community? No Impact. The project site would be located on approximately 4.6 acres of Calas Park. The project would not create a physical division of an existing community, like what could occur with the development of a freeway or large linear infrastructure. The project would not result in a removal of an existing means of access, such as a road or bridge, that would impede mobility with an existing community and other areas.

Upon completion, recreational use of the affected portion of the park would resume consistent with existing conditions. Therefore, the project would not physically divide an established community, and no impact would occur.
b) Would the project cause a significant environmental impact due to a conflict with any land use plan, policy, or regulation adopted for the purpose of avoiding or mitigating an environmental effect? No Impact. The project site is zoned as Open Space and has a General Plan land use designation of Park/Open Space. The project would include the construction of a stormwater capture and treatment facility, primarily located underground, and park improvements to the existing Calas Park. Upon completion, recreational use of the affected portion of the park would resume under similar conditions. Implementation of the project would not result in a change to land uses. Potential environmental impacts associated with the implementation of the project are analyzed throughout this MND. The project will incorporate applicable mitigation measures to reduce environmental impacts. Therefore, the project would not be in conflict with any land use plan, policy, or regulation adopted for the purpose of avoiding or mitigating an environmental effect. Therefore, no impacts would occur.

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3.12 Mineral Resources

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
XII. MINERAL RESOURCES – Would the project:
a) Result in the loss of availability of a known
mineral resource that would be of value to
the region and the residents of the state?

b) Result in the loss of availability of a locally
important mineral resource recovery site
delineated on a local general plan, specific
plan or other land use plan?

a) Would the project result in the loss of availability of a known mineral resource that would be of value to the region and the residents of the state?
and
b) Would the project result in the loss of availability of a locally important mineral resource recovery site delineated on a local general plan, specific plan or other land use plan? No Impact. The project site is entirely developed and within an urban area. No mineral resources are known to occur on or near the project site (USGS 2025). Therefore, the project would not result in any loss of availability of a known mineral resource or locally important mineral resource recovery site, and no impact would occur.

3.13 Noise

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
XIII. NOISE – Would the project result in:
a) Generation of a substantial temporary or
permanent increase in ambient noise levels
in the vicinity of the project in excess of
standards established in the local general
plan or noise ordinance, or applicable
standards of other agencies?

b) Generation of excessive groundborne
vibration or groundborne noise levels?

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Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
c) For a project located within the vicinity of a
private airstrip or an airport land use plan
or, where such a plan has not been
adopted, within two miles of a public airport
or public use airport, would the project
expose people residing or working in the
project area to excessive noise levels?

This section is based on technical analysis conducted by Dudek, including quantitative estimates of noise emissions based on assumptions developed in consultation with the project design engineers. The results of the noise estimates are provided as Appendix G, Noise Assessment Data, to this MND.

Existing Setting
The Project is located in the southern portion of the City of Carson, which is in southwestern Los Angeles County, California. To the north, the park is bounded by East 220th Street, followed by Carnegie Middle School, a grassy area containing the transmission line corridor, and residential uses. To the south, the park is bounded by East Jay Street, followed by residential uses, and East 223rd Street, followed by light industrial/warehousing, office, and commercial uses. To the east, the park is bounded by South Edgar Street, followed by residential uses. To the west, the park is bounded by residential uses.

Represented by locations ST1, ST2, and ST3 in Table 3.13-1, the existing outdoor ambient sound environment of the project location was sampled during a field survey conducted on February 20, 2025 (see Figure 5). Collected sample sound pressure level measurements at these locations, along with documented investigator observations regarding perceived or witnessed acoustical contributors to this baseline or pre -project noise environment, also appear in Table 3.13 -1. These locations are intended to be represent ative of the existing single -family homes adjoining the project area. Photographs, tagged survey positions, and instrument details can be found in Appendix G, Noise Assessment Data.

Table 3.13-1. Measured Samples of Existing Outdoor Ambient Sound Level Survey
Position Description/Address Time
Leq
(dBA)
Lmax
(dBA)
Lmin
(dBA)
Notes (Perceived Sound
Sources)
ST1 1037 E 220th St,
Carson, California
90745
1:12 p.m.–
1:27 p.m.

59.6 74.7 47.4 Traffic, Birds, Distant Landscape
Noise, Aircraft Noise
ST2 Western Calas Park
boundary
12:37 p.m.–
12:52 p.m.

54.7 75.9 47.7 Traffic, Birds, Distant Dog
Barking, Rustling Leaves, Distant
Aircraft
ST3 1002 E Jay St,
Carson, California
90745
12:54 p.m.–
1:09 p.m.

52.1 65.7 46.8 Traffic, Birds, Distant Landscape
Noise, Rustling Leaves
Source: Appendix G, Noise Assessment Data.

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Notes: Leq = equivalent continuous sound level (time-averaged sound level); dBA = A-weighted decibels; Lmax = maximum sound level during the measurement interval; Lmin = minimum sound level during the measurement interval.

The measured outdoor energy -equivalent sound level (L eq) values appearing in Table 3.13 -1 range from 52.1 to

59.6 A-weighted decibels (dBA) and are consistent with expectations for the environment based on the distance to roadways, such as East 220th Street.

Regulatory Setting and Thresholds of Significance
In the City of Carson, construction activities near single -family residential areas are regulated under the Carson Municipal Code, specifically Section 5502(c), which amends the Los Angeles County Noise Control Ordinance to establish local standards. Construction is permitted Monday through Saturday from 7:00 a.m. to 8:00 p.m., and is prohibited on Sundays and legal holidays. For construction activities lasting 20 days or less, the maximum allowable exterior noise level is 75 dBA during permitted hours and 60 dBA during prohibited hours. For activities extending beyond 20 days, the limits are reduced to 65 dBA during permitted hours and 55 dBA during prohibited hours.

These noise levels are measured at the property line of the affected single-family residence. Compliance with these standards is mandatory for all construction projects and is enforced by the City of Carson to minimize noise impacts on residential neighborhoods.
a) Would the project result in generation of a substantial temporary or permanent increase in ambient noise levels in the vicinity of the project in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies?
Construction
Less-than-Significant Impact with Mitigation. Construction of the project would result in the temporary generation of noise at the project site. Construction would involve the use of heavy equipment and machinery, such as excavators, loaders, cranes, temporary generators, scrapers, and other equipment .

Construction would generate levels of noise that can vary from hour to hour and day to day depending on the equipment in use, the operations being performed, and the distance between the source and receptor.

Typically, construction equipment operates in alternating cycles of full power and low power, producing average noise levels less than the maximum noise level. The average sound level of construction activity also depends on the amount of time that the equipment operates and the intensity of construction activities during that time. Aggregate noise emission from construction activities, broken down by phase, was predicted at two evaluation distances to the nearest existing noise-sensitive receptor: (1) from the nearest position of the construction site boundary, and (2) from the center of the construction site. The closest existing noise-sensitive residential receptor is approximately 50 feet to the west of the proposed project’s western boundary. At the site boundary, this analysis assumes that only the two loudest pieces of equipment, comparable to F ederal Transit Administration general assessment guidance, for the listed phase will be involved in construction activity for a limited portion of the 8-hour workday. In other words, at such proximity, the operating equipment cannot “stack” or crowd the vicinity and still operate.

Table 3.13-2 presents the estimated construction noise level (8 -hour Leq) for each anticipated phase of project construction activity. Details of these predictions in Appendix G, Noise Assessment Data, show the expected acoustical contribution from each type of operating construction equipment for each phase.

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Table 3.13-2. Estimated Per-Phase Construction Noise Levels Project
Construction
Activity Phase
Nearest Horizontal
Distance to Nearest
Noise -sensitive
Receptor (Feet)
Predicted 8 -
hour L eq (dBA)
for Nearest
Distance
Centroid Horizontal
Distance to Nearest
Noise -sensitive
Receptor (Feet)
Predicted 8 -
hour L eq (dBA)
for Centroid
Distance
Demolition 50 72.9 200 68.5
Site Preparation 50 74.2 200 69.2
Underground
Stromwater Storage
system excavation
150 67.5 200 68
Underground
stormwater storage
system construction
150 67.6 200 64.6
Storm drain
diversion and
pretreatment
50 74 200 64.4
Outlet Line 50 74.7 200 67.4
Landscape and Site
improvements
50 73.9 200 63.8
Source: Appendix G, Noise Assessment Data.

Note: Leq = energy-equivalent sound level; dBA = A-weighted decibel As presented in Table 3.13 -2, the estimated construction noise levels are predicted to reach up to 74.7 dBA Leq over an 8-hour period at the nearest existing residences, located approximately 50 feet from the project’s western boundary during outlet line activities. These estimates are based on modeling assumptions that limit the operation of heavy equipment to a cumulative period of up to 1 hour per day during the demolition, site preparation, and landscape and site improvement phases. However, if construction equipment were to operate for longer durations or concurrently during the same workday, the noise levels could potentially exceed the 65 dBA 8-hour Leq threshold established by the City for single - family residential areas, as specified in Carson Municipal Code Section 5502(c) for long-term construction activities (lasting more than 20 days).

At more typical distances, closer to the center of the project site (approximately 200 feet from the nearest residence), construction noise levels are estimated to range from approximately 64 dBA Leq to 69 dBA Leq.

To ensure compliance with the 65 dBA 8-hour Leq threshold and to mitigate potential exceedances, MM- NOI-1 shall be implemented. Proper implementation of MM-NOI-1, including the installation of 8-foot- tall temporary noise barriers along the project boundar ies, can reduce noise levels by up to 1 2 decibels, thereby reducing the estimated unmitigated construction noise levels to approximately 64.7 dBA Leq, which is within the acceptable limit.

In summary, while construction noise during allowable daytime hours (between 7:00 a.m. and 8:00 p.m.) has the potential to exceed the 65 dBA 8-hour Leq threshold at the nearest residential receptors, the incorporation of MM-NOI-1 is recommended to reduce construction noise exposure levels. With the implementation of this mitigation measure, temporary construction-related noise would be less than significant.

The outcome of the King & Gardiner Farms versus Kern County judge’s decision established a requirement for construction noise analyses to disclose the relative increase of construction noise over ambient noise

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levels. Construction noise levels would cause a temporary increase of up to 15 dB to 23 dB Leq over existing ambient noise levels, which would be perceived as being up to four times as loud to average healthy hearing.

Operation
Less-than-Significant Impact. Upon completion of construction, the project would feature underground infrastructure to convey stormwater. Operation of powered mechanical systems would be enclosed in a concrete “wet well” below grade with only a double -door hatch to the above-surface environment. Hence, noise from operation of pump would be isolated by the closed access hatch and would result in predicted noise levels that are less than 30 dBA at a radius of over 50 feet from the hatch, well below the existing noise environment (Table 3. 13-1). On this basis and compared to the measurement samples of L eq presented in Table 3.13 -1, project operation noise is anticipated to be less than the existing outdoor ambient level at the noise-sensitive residential receptor.

Replacement of the athletic fields after construction of the subsurface stormwater capture system would restore Calas Park conditions prior to the proposed project, which includes visitors enjoying sports or spectating from bleachers at locations on the field perimeters. Therefore, noise from these on -site field activities that involve participant and spectator speech an d related sound emission would be relatively unchanged. Project operation noise would be considered less than significant.

The following mitigation measure would apply during project construction activities:

MM-NOI-1 Temporary Construction Noise Reduction. The City or its contractor shall implement one or more of the following options for on-site noise control and sound abatement means that, in aggregate, would yield a minimum of 10 dB of construction noise reduction during construction of the project:
▪ Administrative controls (e.g., further reduce operating time of equipment and/or prohibit usage of equipment type[s] within certain distances to a nearest receiving occupied off-site property).
▪ Engineering controls (change equipment operating parameters [ e.g., speed, capacity], or install features or elements that otherwise reduce equipment noise emission [e.g., upgrade engine exhaust mufflers]).
▪ Install noise abatement on the site boundary fencing (or within, as practical and appropriate) in the form of sound blankets or comparable temporary solid barriers to occlude construction noise emission between the site (or specific equipment operation as the situation may define) and the noise-sensitive receptor(s) of concern. b) Would the project result in generation of excessive groundborne vibration or groundborne noise levels? Less-than-Significant Impact. Vibration is oscillatory movement of mass (typically a solid) over time.

Depending on their distances to a sensitive receptor, operation of large bulldozers, graders, loaded dump trucks, or other heavy construction equipment and vehicles on a construction site have the potential to cause high vibration amplitudes.

The Carson Municipal Code does not have a vibration threshold against which project construction-related ground-borne vibration impacts to the community can be assessed. For purposes of this impact assessment, a vibration velocity level of 0.2 inches per second (ips) peak particle velocity (PPV) is used as

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the standard for evaluating human annoyance (to perceived ground -borne vibration within an occupied structure) and the potential risk for residential building damage due to “continuous” or frequently occurring ground-borne vibration events (Caltrans 2020).

Ground-borne vibration attenuates rapidly, even over short distances. The attenuation of ground -borne vibration as it propagates from source to receptor through intervening soils and rock can be estimated with expressions found in Federal Transit Administration and Caltrans guidance. By way of example, for a bulldozer or grader operating as close as 50 feet to the nearest receiving residential land use during the site preparation construction phase as shown in Table 3.13-2, the estimated vibration velocity level would be 0.031 ips per the equation as follows (FTA 2018):

PPVrcvr = PPVref × (25/D)1.5 = 0.031 ips PPV = 0.089 × (25/50)1.5 In the above equation, PPV rcvr is the predicted vibration velocity at the receiver position (i.e., residence), PPVref is the reference value at 25 feet from the vibration source (the bulldozer), and D is the actual horizontal distance to the receiver from the source.

Predicted ground-borne vibration velocity PPV values associated with project construction are below the

0.2 ips PPV threshold for building occupant annoyance and building damage risk. Impacts during construction would be less than significant.

Once operational, the proposed project would not be expected to feature major producers of ground-borne vibration. For this reason, project operation ground -borne vibration at off -site receptors would be considered less than significant.
c) For a project located within the vicinity of a private airstrip or an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? No Impact. There are no public airports or private airfields within 2 miles of the project and the project area is far from any aviation traffic noise contour greater than 65 dBA community noise equivalent level. Construction workers and park users would not be exposed to significant aviation noise levels. No impact would occur.

3.14 Population and Housing

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
XIV. POPULATION AND HOUSING – Would the project:
a) Induce substantial unplanned population
growth in an area, either directly (for
example, by proposing new homes and
businesses) or indirectly (for example,
through extension of roads or other
infrastructure)?

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Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
b) Displace substantial numbers of
existing people or housing, necessitating
the construction of replacement
housing elsewhere?

a) Would the project induce substantial unplanned population growth in an area, either directly (for example, by proposing new homes and businesses) or indirectly (for example, through extension of roads or other infrastructure)?
No Impact. Construction of the project would result in a temporary direct increase in construction jobs in the area. However, given the relatively small nature of the project construction and anticipated schedule, the demand for construction employment would likely be met within the existing and future labor market in the City and in the greater Los Angeles County area. If construction workers live outside of the City, these workers would likely commute during the temporary construction period. Operationall y, the project does not contain land uses that typically result in direct population growth, such as new homes or large commercial/business centers. The project would not change the use of the existing Calas Park . Upon completion, the project would improve Calas Park to further serve the existing and anticipated future demand for recreational uses within the City. Additionally, the project is consistent with underlying land use and zoning designations. Therefore, the project would not directly result in sub stantial unplanned population growth in the area.

The project is located in an area served by existing roads and infrastructure. The project does not include the extension of utility infrastructure, such as sewer lines or roads, into previously undeveloped areas that may indirectly induce growth. Therefor e, the project would not indirectly result in substantial unplanned population growth in the area. No impact would occur.
b) Would the project displace substantial numbers of existing people or housing, necessitating the construction of replacement housing elsewhere?
No Impact. The project site does not contain any existing housing or provide other means of housing people. The project would not displace substantial numbers of existing people or housing, necessitating the construction of replacement housing elsewhere. No impact would occur.

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3.15 Public Services

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
XV. PUBLIC SERVICES – Would the project:
a) Result in substantial adverse physical impacts associated with the provision of new or physically altered governmental facilities, need for new or physically altered governmental facilities, the construction of which could cause significant environmental impacts, in order to maintain acceptable service ratios, response times, or other performance objectives for any of the public services:

Fire protection?
Police protection?
Schools?
Parks?
Other public facilities?

a) Would the project result in substantial adverse physical impacts associated with the provision of new or physically altered governmental facilities, need for new or physically altered governmental facilities, the construction of which could cause significa nt environmental impacts, in order to maintain acceptable service ratios, response times, or other performance objectives for any of the public services:

Fire protection? Police protection? Schools? Other public facilities? No Impact. As discussed in Section 3.14, Population and Housing, the project would not induce substantial unplanned population growth in the area. As such, construction, operation, and maintenance of the project would not require new or physically altered facilities associated with fire protection, police protection, schools, or other public facilities. Therefore, no impacts would occur.

Parks?
Less-than-Significant Impact. The project is located within Calas Park and would result in physical alteration to an existing park. The total duration of project construction is anticipated to last 14 months and would require temporary closure of the park. Depending on the construction phase, affected portions of Calas Park would be temporarily closed to the public for the duration of the construction phase. The construction area would be fenced off for safety and security purposes and made unavailable for public use during project construction. The proposed stormwater capture and treatment facility would be located primarily underground and would not affect park use. The project would also include replacing the existing baseball/softball and soccer fields, replacing the outfield fence along East 220 th Street, and planting new trees as described in Section 2.2. 2, Park Improvements . Upon completion of construction, recreational use of the park would resume similar to existing conditions. As such, implementatio n of the project would not require the provision of new parks. Therefore, impacts to parks as a result of the project would be less then significant .

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3.16 Recreation

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
XVI. RECREATION
a) Would the project increase the use of
existing neighborhood and regional parks or
other recreational facilities such that
substantial physical deterioration of the
facility would occur or be accelerated?

b) Does the project include recreational
facilities or require the construction or
expansion of recreational facilities which
might have an adverse physical effect on
the environment?

a) Would the project increase the use of existing neighborhood and regional parks or other recreational facilities such that substantial physical deterioration of the facility would occur or be accelerated? Less-than-Significant Impact. The total duration of project construction is anticipated to last 14 months and would require the temporary closure of portions of Calas Park. As such, project construction may result in the temporary increase in use of other parks in the City. However, upon completion of construction, recreational use of the affected portion of the park would resume under existing conditions. As such, impacts to recreational facilities would be less than significant. b) Does the project include recreational facilities or require the construction or expansion of recreational facilities, which might have an adverse physical effect on the environment? Less-than-Significant Impact. The project would include improvements to the existing Calas Park . As discussed in Section 3.16(a) , Recreation, the temporary closure of the park may result in an increase in use of other parks in the City. However, upon completion of construction, recreational use of the affected portion of the park would resume under existing conditions. Furthermore, as discusse d in Section 3.14 , Population and Housing, implementation of the project would not induce population growth. As such , the project would not require the construction or expansion of recreational facilities. Potential environmental impacts associated with the implementation of the project are analyzed throughout this MND. Impacts would be less than significant.

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3.17 Transportation

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
XVII. TRANSPORTATION – Would the project:
a) Conflict with a program, plan, ordinance, or
policy addressing the circulation system,
including transit, roadway, bicycle, and
pedestrian facilities?

b) Conflict or be inconsistent with CEQA
Guidelines Section 15064.3, subdivision (b)?
c) Substantially increase hazards due to a
geometric design feature (e.g., sharp curves
or dangerous intersections) or incompatible
uses (e.g., farm equipment)?

d) Result in inadequate emergency access?

a) Would the project conflict with a program, plan, ordinance, or policy addressing the circulation system, including transit, roadway, bicycle and pedestrian facilities? Less-than-Significant Impact. The project would not conflict with applicable programs, plans, ordinances, or policies addressing the circulation system, as further discussed below. This includes the City’s General Plan Circulation Element (City of Carson 2023); the Carson Master Plan of Bikeways (City of Carson 2013); and the existing and proposed roadway, pedestrian, bicycle and transit facilities and services in the project area.

General Plan Circulation Element
The Circulation Element furthers the General Plan’s vision and objectives of promoting multi-modal mobility, enhancing connection and access across the community, and supporting development of “Complete Streets,” while minimizing adverse impacts of truck traffic. The Circulation Element seeks to improve access and safety for all roadway users, and encourage walking, biking, and the use of public transit to meet local and regional goals. (City of Carson 2023). The following guiding policies are relevant to the project:
▪ CIR-G-1: Provide a balanced transportation system of multimodal networks providing a broad range of travel options to make transportation convenient, comfortable, and safe for people of all abilities. ▪ CIR-G-2: Promote bicycling and walking, and support and improve connections to local and regional transit service.
▪ CIR-G-3: Manage the transportation network to minimize roadway congestion, while balancing traffic Level of Service (LOS) objectives with promoting reduction in vehicle miles traveled and considerations of community character and design.

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Carson Master Plan of Bikeways
The Carson Master Plan of Bikeways lays out a strategic vision for enhancing bicycle transportation in the city. This plan is the guiding document for all bicycle infrastructure, policies, and programs in Carson. The plan is a blueprint to enable citizens to feel safe and comfortable when bicycling throughout the City, and it aims to encourage more citizens to partake in this healthy, environmentally conscious transportation choice. The plan proposes an extensive network of streets designed to be safe and comfortable for bicyclists, with the goal of enhancing the practical use of bicycles as a transportation choice. Using the planned network, people in Carson can reach schools, shopping, jobs, recreational activities, and other important destinations—all without the need to drive . In addition to the proposed bikeway network, the Master Plan of Bikeways also contains bikeway design guidelines, recommended programs and policies to encourage bicycle travel and increase cyclist safety, potential funding sources for implementing the plan , and an implementation framework that prioritizes the most important bikeway projects.

Transit, Bicycle, and Pedestrian Facilities
Public transportation in the City is provided by the Los Angeles County Metropolitan Transportation Authority, Torrance Transit, Long Beach Transit, Compton Renaissance Transit, and Gardena Transit . The City of Carson provided a service called the Carson Circuit; however, it was discontinued during the COVID- 19 pandemic and the City has instead offered Dial -A-Ride services for all adult Carson residents (City of Carson 2022). The nearest transit route to the site is Long Beach Transit Route 8, with service on East 223rd Street. Long Beach Transit Route 8 is an east-west route that connects Long Beach and Carson.

The nearest bus stop to the project site is located at the intersection of East 223rd Street and South Edgar Street, approximately 0.18 miles south of the project site, servicing Long Beach Transit Route 8. The route operates from approximately 5:05 a.m. to 8:10 p.m. on weekdays, and from 10:45 a.m. to 5:55 p.m. on Saturday. The bus stop at the intersection of Bonita Street and Carson Street is located approximately 0.27 miles northwest of the projects, servicing Long Beach Transit Route 4. Long Beach Transit Route 4 operates from approximately 5:11 a.m. to 8:49 p.m. on weekdays, and from 10:10 a.m. to 5:49 p.m. on Saturdays.

There are numerous existing and proposed bike facilities within the vicinity of the project site, including a Class III bike route on Carson Street, between Figueroa Street and the Dominguez Channel, and a Class II bike lane on Avalon Boulevard , between East 223rd Street and Deloras Drive. Proposed bike facilities in the vicinity of the project site include Class III bike routes on East 220th Street, between Figueora Street and East 223 rd Street, and on Bonita Street , between East 223rd Street and East 213 th Street (City of Carson 2023).

The City of Carson is well served by sidewalks, with relatively few gaps in the sidewalk network. Sidewalks are present along most streets throughout the City except for some neighborhoods and industrial areas .

Pedestrian crosswalks are provided at signalized and, occasionally, unsignalized intersections (City of Carson 2023).

Impact Analysis
The project entails constructing and operating a stormwater capture and treatment facility within the northern portion of Calas Park, replacing the existing baseball/softball and soccer fields once construction is complete, and improving amenities that will be similar in nature to the existing features.

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Construction
The project would result in a temporary, short -term increase in traffic during construction. This includes construction workers arriving to and from the project site and the delivery of large construction equipment and hauling trips to the site as needed. The t otal duration of project construction is anticipated to be 14 months, with some phases overlapping. Typical construction work hours would be Monday through Friday, 7:00 a.m. to 8:00 p.m. , pursuant to the City of Carson Noise Control Ordinance. Night w ork is not anticipated.

Regional access to the park is from I-405, which is approximately 0. 2 miles to the northeast; State Route 47, which is approximately 1.6 miles to the east; and I-110, which is approximately 1.7 miles to the west. Local construction access would be provided from East 220th Street. Temporary equipment staging and construction trailers would be established within the existing park boundary, with no additional off-site staging anticipated to be needed. Project construction would require the temporary partial closures of East 220th Street and Bonita Street. No full road closures are anticipated, and access to surrounding driveways would be maintained at all times. The temporary partial closure s of East 220th Street and Bonita Street would be performed pursuant to a traffic control plan prepared by the contractor and subject to City approval. The traffic control plan would include measures such as identifying the proposed truck routes, minimizing and/or avoiding truck travel during peak hours, using flaggers for local site access, and other measures. All lane closures would be performed pursuant to the traffic control plan. With implementation of the traffic control plan, the potential impact to the local circulation would be minimized and there would be no changes that would affect the safety and accessibility of the transportation system.

Construction of the reservoir would entail removing the field surface and excavating earth material up to approximately 20 feet below ground surface. Material would be placed into dump trucks and hauled off site to a licensed landfill or quarry for reuse or disposal. The full extent of the material haul route or routes would be determined by the contractor and City of Carson Public Works Department once a disposal site has been identified . It is anticipated that the local route would follow South Edgar Stre et to East 223rd Street, which is a designated truck route in the City of Carson (City of Carson 2023), to Figueroa Street to access I-405 or I-110. Due to the nominal and temporary increase in construction traffic, any effect on the operations of roadways or the overall circulation system along these roads would be minimal.

The baseball/softball and soccer fields are expected to be closed to the public for the duration of project construction, which is anticipated to be approximately 14 months. The remaining portions of the park ( tennis courts, basketball courts, parking lot, and playground ) would be open to the public during construction.

The nearest bicycle facility to the project site is a Class III bike route on Carson Street between Figueroa Street and the Dominguez Channel. Long Beach Transit Route 8 is the nearest transit route to the site, with service on East 223rd Street, and a bus stop located on East 223rd Street, near South Edgar Street. The transit, bicycle, and pedestrian facilities would remain open during construction, and the temporary and minimal increase in construction-related traffic would not interfere with existing pub lic transit, bicycle, or pedestrian facilities. Impacts would be less than significant.

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Operations
The proposed park improvements would replace existing amenities with improved features that would allow for similar active and passive recreation uses as under existing conditions, but with an enhanced experience for park users. Once the stormwater capture system is installed, Field 2 would be replaced with an updated multipurpose field to be used for both softball and soccer. Other improvements include replacing the existing outfield fence along East 220 th Street with a 12-foot fence and planting three new sycamore trees with root barriers.

Calas Park is served by multiple existing roads, including East 220 th Street, South Edgar Street , and numerous local streets surrounding the site. Park users would also continue to be served by the existing transit, bicycle, and pedestrian facilities near the site. The project would reconstruct the sidewalk and drain immediately west of the tennis courts to repair surface lifting and damage. A decomposed granite path would be installed on the east side of the tennis courts to provide a connection from the sidewalk into the park.

The project would not include site improvements that would extend into the public right-of-way or interfere with the existing roadway network, public transit, bicycle, or pedestrian facilities, or impede the construction of new or the expansion of existing faci lities in the future. Bicyclist and pedestrian safety would be maintained at existing levels in the area. The project would also not severely delay, impact, or reduce the service level of transit in the area.

Therefore, the proposed project would not conflict with the circulation policies within the City’s General Plan or the Carson Master Plan of Bikeways. Impacts would be less than significant. b) Would the project conflict or be inconsistent with CEQA Guidelines Section 15064.3, subdivision (b)? Less-than-Significant Impact. CEQA Guidelines Section 15064.3(b) focuses on VMT for determining the significance of transportation impacts. The Updated CEQA Guidelines state that “generally, vehicle miles traveled (VMT) is the most appropriate measure of transportation impacts,” and define VMT as “the amount and distance of automobile travel attributable to a project.” “Automobile” refers to on -road passenger vehicles, specifically cars and light trucks. The Governor’s Office of Land Use and Climate Innovation (LCI), formerly known as the Governor’s Office of Planning and Research, has clarified in its Technical Advisory on Evaluating Transportation Impacts in CEQA (LCI Technical Advisory) that heavy-duty truck VMT is not required to be included in the estimation of a project’s VMT (LCI 2018).

The City has not yet established VMT guidelines or thresholds for evaluating transportation impacts under CEQA; therefore, the VMT Analysis was based on the LCI Technical Advisory and the Los Angeles County Public Works Transportation Impact Analysis Guidelines (Los Angeles County Public Works 2020). Based on guidance provided from LCI, and per the County’s guidelines, land use projects can be screened from a VMT analysis if it generates 110 or fewer daily (permanent) trips, is a local serving retail use (50,000 square feet or less), is and office or residential use located in a low VMT area, is within a transit priority area, or is an affordable housing project. A project only needs to satisfy one of the screening criteri a to be exempt from further VMT.

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Construction
CEQA Guidelines Section 15064.3(b) is divided into four subdivisions: (1) land use projects, (2) transportation projects, (3) qualitative analysis, and (4) methodology. The project is not a land use or transportation project; and the project would not resu lt in a major expansion of Calas Park. Therefore, neither Section 15064.3(b)(1) nor Section 15064.3(b)(2) of the CEQA Guidelines apply. Instead, the project would be categorized under Section 15064.3(b)(3), suitable for qualitative analysis and not subject to a quantitative threshold. Furthermore, the County’s project size screening criterium (projects generating 110 daily trips or less) are intended to address permanent vehicle trips. Therefore, a qualitative analysis of the project construction is provided.

The project would involve construction that would generate temporary construction -related traffic for approximately 14 months. Even though worker and vendor trips would generate VMT, once construction is completed, the construction -related traffic would cease, and traffic would return to pre -construction conditions. Measures to reduce the VMT generated by workers and trucks are limited, and there are no thresholds or significance criteria for temporary, construction-related VMT. The project construction would be generally consistent with construction activities in terms of the temporary nature of activities, trip generation characteristics, and the types of vehicles and equipment required. The increase in VMT associated with the projects ’ construction is expected to be temporary ; therefore, VMT impact would be less than significant.

Operations
Once construction is complete, project operation is anticipated to entail routine maintenance activities at the stormwater capture facility performed by City staff . Activities would include removal of debris and pollutant constituents from the treatment devices, pump testing and calibration, monitoring/sampling of treatment, and cleaning the storage reservoir. Proposed park improvements would not expand the footprint of Calas Park or result in a major expansion of facilities that would induce substantial demand or park users. The operation of the project can be considered a “small project” per the County ’s Transportation Impact Analysis Guidelines and OPR’s Technical Advisory, given that it would not generate greater than 110 daily trips11 and would therefore be presumed to have a less-than-significant VMT impact.

Therefore, the project would not conflict or be inconsistent with CEQA Guidelines Sections 15064.3(b)(1) and 15064.3(b)(3) and impacts would be less than significant.

11 This threshold ties directly to the OPR technical advisory and notes that CEQA provides a categorical exemption for existing facilities, including additions to existing structures of up to 10,000 square feet, so long as the project is in an area wher e public infrastructure is available to allow for maximum planned development and the project is not in an environmentally sensitive area (14 CCR 15301[e][2]). Typical project types for which trip generation increases relatively linearly with building footprint (i.e., general office building, single tenant office building, office park, and business park) generate or attract an additional 110-124 trips per 10,000 square feet. Therefore, absent substantial evidence otherwise, it is reasonable to conclude that the additio n of 110 or fewer trips could be considered not to lead to a significant impact.

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c) Would the project substantially increase hazards due to a geometric design feature (e.g., sharp curves or dangerous intersections) or incompatible uses (e.g., farm equipment)? Construction
Less-than-Significant Impact. The project site is located in an established, developed area with direct access to designated local and regional truck routes. Transportation and haul permits would be required from Caltrans and the City of Carson for construction truck traffic. The project would not introduce uses (types of vehicles) that are incompatible with existing uses already served by the area’s road system during either construction or operations.

Construction would also require temporary work in East 220th Street and Bonita Street and portions of traffic lanes would be closed. No full road closures are anticipated. The project would implement a traffic control plan to be prepared by the contractor and approved by the City Engineer. All lane closures would be performed pursuant to the traffic control plan. With implementation of the traffic control plan, there would be no changes that would affect the safety and accessibility of the transportation sy stem. Therefore, impacts associated with hazardous design features or incompatible land uses during construction of the project would be less than significant.

Operations
Less-Than-Significant Impact. Access to the site would be provided from existing city streets and from the existing park driveway. There would be no changes to the existing off -site circulation on City roads.

Therefore, the project would not substantially increase hazards due to a roadway design feature or introduce incompatible uses during operation of the project. Impacts would be less than significant. d) Would the project result in inadequate emergency access? Construction
Less-Than-Significant Impact. The project site is located in an established, developed area with sufficient access for emergency service providers. Construction would require temporary work in East 220th Street and Bonita Street, which would require closing portions of the travel lanes. However, construction activities would occur on the project site and no full road closures in the public right-of-way or driveway closures are anticipated that would impact adopted emergency access or response plans. As part of the traffic control plan, the contractor wo uld follow standard construction practices and ensure that adequate on -site circulation and access is always maintained for all users, including coordinating with local emergency response providers (local police, fire, and medical dispatch) regarding proposed construction activities. As such, construction of the project would have a less-than-significant impact related to emergency access.

Operations
Less-than-Significant Impact. As previously discussed , the project site is located in an established, developed area with sufficient access for emergency service providers. There would be no changes to the existing off-site circulation on City roads during project operations. As such, operation of the project would have a less-than-significant impact related to emergency access.

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3.18 Tribal Cultural Resources

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
XVIII. TRIBAL CULTURAL RESOURCES
Would the project cause a substantial adverse change in the significance of a tribal cultural resource, defined in Public Resources Code Section 21074 as either a site, feature, place, cultural landscape that is geographically defined in terms of the size and scope of the landscape, sacred place, or object with cultural value to a California Native American tribe, and that is:
a) Listed or eligible for listing in the California
Register of Historical Resources, or in a
local register of historical resources as
defined in Public Resources Code Section
5020.1(k), or

b) A resource determined by the lead agency,
in its discretion and supported by
substantial evidence, to be significant
pursuant to criteria set forth in subdivision
(c) of Public Resources Code Section
5024.1? In applying the criteria set forth in
subdivision (c) of Public Resources Code
Section 5024.1, the lead agency shall
consider the significance of the resource to
a California Native American tribe.

The evaluation of potential impacts to Tribal Cultural Resources (TCRs) is primarily based on the findings resulting from tribal consultation conducted by the City, as the lead agency, as well as the findings of Section 3.5 , Cultural Resources, in this MND. Background research and fieldwork conducted to inform this analysis include a NAHC SLF search, archival research and CHRIS database records search, a pedestrian survey of the project site, and the results of formal tribal consultation pursuant to California AB 52.

The project is subject to compliance with AB 52 (PRC 21074), which requires consideration of impacts to TCRs as part of the CEQA process, and that the lead agency notify California Native American Tribal representatives (that have requested notification) who are traditionally or culturally affiliated with the geographic area of the proposed project. All NAHC-listed California Native American Tribal representatives that have requested project notification pursuant to AB 52 were sent letters by the City on April 30, 2025 . The notification letters contained a project description, outline of AB 52 timing, an invitation to consult, a project site figure, and contact information for the appropriate lead agency representative. To date, one response has been received by the City from the Santa Rosa Band of Cahuilla Indians deferring any comments to the Sobaba Band of Luiseno Indians . A response was not received from the Sobaba Band of Luiseno Indians.

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Would the project cause a substantial adverse change in the significance of a tribal cultural resource, defined in Public Resources Code Section 21074 as either a site, feature, place, cultural landscape that is geographically defined in terms of the size and scope of the landscape, sacred place, or object with cultural value to a California Native American tribe, and that is:
a) Listed or eligible for listing in the California Register of Historical Resources, or in a local register of historical resources as defined in Public Resources Code Section 5020.1(k)? Less-Than-Significant Impact. As discussed in Section 3.5 , Cultural Resources , no previously recorded archaeological resources of Native American origin or TCRs listed in the California Register of Historical Resources or a local register were identified within the project area as a result of the SCCIC records search, the NAHC SLF results, or the pedestrian survey . Additionally, the City notified California Native American Tribal representatives who are traditionally or culturally affiliated with the geographic area of the project pursuant to AB 52. As discussed above, one response was received from the Santa Rosa Band of Cahuilla Indians deferring any comments to the Sobaba Band of Luiseno Indians. A response was not received from the Sobaba Band of Luiseno Indians. Therefore, the project would not adversely affect TCRs that are listed or eligible for listing in the state or local register. Impacts would be less than significant . b) A resource determined by the lead agency, in its discretion and supported by substantial evidence, to be significant pursuant to criteria set forth in subdivision (c) of Public Resources Code Section 5024.1? In applying the criteria set forth in subdivision (c) of Public Resource Code Section 5024.1, the lead agency shall consider the significance of the resource to a California Native American tribe.

Less Than Significant Impact with Mitigation Incorporated. The project is subject to compliance with AB 52 (PRC 21074), which requires consideration of impacts to TCRs as part of the CEQA process and requires lead agencies to provide notification of proposed projects to California Native American Tribal representatives that have requested such notifications.

No TCRs were identified as a result of the response provided from the Santa Rosa Band of Cahuilla Indians.

However, in an abundance of caution and in an effort to protect unknown TCRs, the City has developed mitigation measures ( MM-CUL-1 through MM-CUL-3), as outlined in Section 3.5, Cultural Resources, to ensure the proper treatment of unknown subsurface cultural and tribal cultural resources in the event of an inadvertent discovery. Impacts would be less than significant with mitigation.

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3.19 Utilities and Service Systems

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
XIX. UTILITIES AND SERVICE SYSTEMS – Would the project:
a) Require or result in the relocation or
construction of new or expanded water,
waste water treatment or storm water
drainage, electric power, natural gas, or
telecommunications facilities, the
construction or relocation of which could
cause significant environmental effects?

b) Have sufficient water supplies available to
serve the project and reasonably
foreseeable future development during
normal, dry, and multiple dry years?

c) Result in a determination by the waste
water treatment provider which serves or
may serve the project that it has adequate
capacity to serve the project’s projected
demand in addition to the provider’s
existing commitments?

d) Generate solid waste in excess of state or
local standards, or in excess of the
capacity of local infrastructure, or
otherwise impair the attainment of solid
waste reduction goals?

e) Comply with federal, state, and local
management and reduction statutes and
regulations related to solid waste?

a) Would the project require or result in the relocation or construction of new or expanded water, waste water treatment or storm water drainage, electric power, natural gas, or telecommunications facilities, the construction or relocation of which could cause significant environmental effects? Less-than-Significant Impact. The project includes the construction of a stormwater capture and treatment facility and improvements to the existing Calas Park. The proposed stormwater facility would intercept stormwater and dry -weather flow from existing storm drain channel s within East 220th Street and route it into the filtration facility, where it would be allowed to infiltrate into underlying soils or it would be treated and discharged into an existing catch basin . The proposed pump associated with the treatment facility would be electrically powered, thus requiring an additional connection to the electrical power that currently serve the park ’s lights and irrigation system. Connection to these existing distribution facilities would be sufficient for providing power to the project and would not require any other relocation or construction of electrical power facilities. The project would also re quire

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reconstruction of minor existing water infrastructure in the removal and replacement of the existing irrigation pipes and sprinkler heads. These minor improvements are features of the project that would be subject to engineering design to ensure adjacent f acilities and users are not negatively affected. Any relocation of existing facilities would not be substantial enough to result in a significant impact pursuant to CEQA. Impacts would be less than significant .
b) Would the project have sufficient water supplies available to serve the project and reasonably foreseeable future development during normal, dry and multiple dry years? Less-than-Significant Impact. Project construction would temporarily require a minor amount of water primarily associated with site watering in compliance with SCAQMD Rule 403 to prevent, reduce, or mitigate fugitive dust emissions from construction activities. Once construction is complete, operational changes in water use would include the minor irrigation changes. Other existing components of the park that require water would not change their existing usage. As such, operation of the project would not demand additional water use. Therefore, impacts would be less than significant. c) Would the project result in a determination by the waste water treatment provider which serves or may serve the project that it has adequate capacity to serve the project’s projected demand in addition to the provider’s existing commitments?
No Impact. Construction and operation of the project would not generate wastewater demand. Therefore, no impacts would occur.
d) Would the project generate solid waste in excess of state or local standards, or in excess of the capacity of local infrastructure, or otherwise impair the attainment of solid waste reduction goals? Less-than-Significant Impact. During construction, the project would generate solid waste such as residual wastes, plastics, and soils. Construction -generated solid waste would be temporary and would cease once construction is completed. Solid waste generated by project construction wo uld be properly disposed of at designated landfill facilities for construction and demolition debris. In 2011, California AB 341 was passed, establishing a state goal to reduce, recycle, or compost no less than 75% of waste generated by the year 2020. Operation of the project would not generate any substantial additional solid waste beyond current park conditions. As such, solid waste generated by the project would not exceed state or local standards or the capacity of local infrastructure. Impacts would be less than significant. e) Would the project comply with federal, state, and local management and reduction statutes and regulations related to solid waste?
No Impact. As discussed in Section 3.19(d) , Utilities and Service Systems , construction-generated solid waste would be temporary, and operation of the project would not generate substantially more solid waste than existing conditions. Solid waste generated by the project construction would be disposed of at designated landfill facilities under federal, state, and local regulation. Additionally, the project would be required to adhere to City and county ordinances with respect to waste reduction and recycling. As a result, no impacts related to state and local statutes governing solid waste are anticipated.

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3.20 Wildfire

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
XX. WILDFIRE – If located in or near state responsibility areas or lands classified as very high fire hazard severity zones, would the project:
a) Substantially impair an adopted emergency
response plan or emergency evacuation
plan?

b) Due to slope, prevailing winds, and other
factors, exacerbate wildfire risks, and
thereby expose project occupants to
pollutant concentrations from a wildfire or
the uncontrolled spread of a wildfire?

c) Require the installation or maintenance of
associated infrastructure (such as roads,
fuel breaks, emergency water sources,
power lines or other utilities) that may
exacerbate fire risk or that may result in
temporary or ongoing impacts to the
environment?

d) Expose people or structures to significant
risks, including downslope or downstream
flooding or landslides, as a result of runoff,
post-fire slope instability, or drainage
changes?

a) Would the project substantially impair an adopted emergency response plan or emergency evacuation plan? Less-than-Significant Impact. According to the CAL FIRE Hazard Severity Zone Viewer, the project site is located within a Local Responsibility Area and is not located within a Very High Fire Hazard Severity Zone (CAL FIRE 2024 ). The City has prepared a Draft Hazard Mitigation Plan. The hazard mitigation plan is a document that contains information to assist communities in reducing risk from hazards by identifying resources, information, and strategies for risk reduction (City of Carson 2024). A stormwater d iversion structure would be constructed to connect the proposed system to existing storm drains under East 220th Street and Bonita Street . Additionally, an underground storage reservoir installed beneath the baseball/softball and soccer outfields at Calas Park would be connected directly to the diversion pipeline and an outflow pipeline for sending water back into an existing catch basin beneath East 220th Street. As such, project construction would require the temporary partial closure s of East 220th Street and small portion of Bonita Street. The temporary partial closure s of East 220th Street and Bonita Street would be performed pursuant to a traffic control plan prepared by the contractor and subject to City approval, which would demonstrate that emergency access or evacuation would not be impeded. Traffic on East 220th Street and Bonita Street would resume to existing conditions upon completion of the project. Impacts would be less than significant.

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b) Due to slope, prevailing winds, and other factors, would the project exacerbate wildfire risks, and thereby expose project occupants to pollutant concentrations from a wildfire or the uncontrolled spread of a wildfire? Less-than-Significant Impact. Construction of the project would comply with Article III, Chapter 1 of the City’s Municipal Code, which adopts the Los Angeles County Fire Code by reference , which is based on the California Fire Code with amendments and additions. Chapter 33 of the California Fire Code outlines general fire safety precautions during construction and demolition that are intended to maintain minimum levels of fire protection and limit the spread of fire. The project would not include structures intended for long -term occupancy. Furthermore, the project site is relatively flat and would not influence prevailing winds or other factors that could exacerbate wildfire risk. As such, the project would not exacerbate wildfire risks such that project us ers would be exposed to pollutants concentrations. Impacts would be less than significant . c) Would the project require the installation or maintenance of associated infrastructure (such as roads, fuel breaks, emergency water sources, power lines, or other utilities) that may exacerbate fire risk or that may result in temporary or ongoing impacts to the environment? Less-than-Significant Impact. As discussed previously, the project overall would not exacerbate fire risk.

Construction would comply with California Fire Code requirements to manage and minimize fire risk during construction. Operation of the project would not contain potential sources for fire risk. As such, the project would not result in installation or maintenance of associated infrastructure that may exacer bate fire risk.

Impacts would be less than significant.
d) Would the project expose people or structures to significant risks, including downslope or downstream flooding or landslides, as a result of runoff, post-fire slope instability, or drainage changes? Less-than-Significant Impact. For reasons described previously in Sections 3.9(g) and 3.20(a), (b), and (c), the project would not pose a substantial risk for wildfire. The project would be located on relatively flat land within Calas Park. As such, implementation of the project would not expose people or structures to significant risks from post-fire slope instability or drainage changes. Impacts would be less than significant.

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3.21 Mandatory Findings of Significance

Potentially
Significant
Impact
Less Than
Significant
Impact With
Mitigation
Incorporated
Less Than
Significant
Impact No Impact
XXI. MANDATORY FINDINGS OF SIGNIFICANCE
a) Does the project have the potential to
substantially degrade the quality of the
environment, substantially reduce the
habitat of a fish or wildlife species, cause a
fish or wildlife population to drop below self-
sustaining levels, threaten to eliminate a
plant or animal community, substantially
reduce the number or restrict the range of a
rare or endangered plant or animal, or
eliminate important examples of the major
periods of California history or prehistory?

b) Does the project have impacts that are
individually limited, but cumulatively
considerable? (“Cumulatively considerable”
means that the incremental effects of a
project are considerable when viewed in
connection with the effects of past projects,
the effects of other current projects, and the
effects of probable future projects.)

c) Does the project have environmental effects
which will cause substantial adverse effects
on human beings, either directly or
indirectly?

a) Does the project have the potential to substantially degrade the quality of the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below self - sustaining levels, threaten to eliminate a plant or animal community, substantially reduce the number or restrict the range of a rare or endangered plant or animal, or eliminate important examples of the major periods of California history or prehistory?
Less Than Significant Impact with Mitigation Incorporated. Potential impacts related to sensitive and special-status habitat, wildlife species, and plant species are discussed in Section 3.4, Biological Resources. As discussed in Section 3.4, Biological Resources, all potentially significant impacts to biological resources would be reduced to a level below significance with incorporation of mitigation measures. The proposed project would not substantially degrade the quality of the environment or impact fis h or wildlife species or plant communities. As discussed in Section 3.5, Cultural Resources, potential impacts to cultural resources would be reduced to a level below significance with incorporation of mitigation measures. The proposed project would not eliminate important examples of the major periods of California history or prehistory. Overall, impacts would be less than significant with incorporation of mitigation measures.

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b) Does the project have impacts that are individually limited, but cumulatively considerable? (“Cumulatively considerable” means that the incremental effects of a project are considerable when viewed in connection with the effects of past projects, the effec ts of other current projects, and the effects of probable future projects.)
Less Than Significant Impact with Mitigation Incorporated . As indicated in the analysis presented throughout Chapter 3, Initial Study Checklist, of this MND, the proposed project would not result in significant and unavoidable impacts in any issue area. Mitigation measures would reduce impacts to below a level of significance.

Cumulative projects in the City include the Imperial Avalon Specific Plan; the District at South Bay Specific Plan; the Brookhollow Group Warehouse project located at 1210 East 223 rd Street, approximately 0.24 miles southeast of the project site; the Perry Street Residences located at 21611 Perry Street, approximately 0.36 miles northeast of the project site; the Carson Hyundai service building project located at 2205 East 223rd Street, approximately 1.27 miles southeast of the project site; the Dutch Bro’s Coffee project located at 20377 Avalon Boulevard, approximately 1.45 miles north of the project site; the Carson Triangle project located at 21140, 21212, and 21126 Avalon Boulevard, located approximately 0.78 miles north of the project site; the ASPCA Animal Clinic project located at 16300 South Figueroa Street, approximately 4.14 miles north of the project site; the Shell Compressed Natural Gas Dispensing Station project located at 20945 South Wilmington Avenue, approximately 0.97 miles northeast of the project site; and the Carson to Paramount Hydrogen Gas Pipeline project located at 23300 South Alameda Street, approximately 1.78 miles southeast of the project site. The project is not located in the immediate vicinity of any large cumulative projects whose construction phase would overlap to create cumulative impacts.

The proposed project, as with potential cumulative projects, would incorporate mitigation measures to reduce impacts, as applicable, particularly during construction. Upon completion of construction, the proposed project would have no potential to contribute to a cumulative impact. Impacts would be less than significant with incorporation of mitigation measures.
c) Does the project have environmental effects which will cause substantial adverse effects on human beings, either directly or indirectly?
Less Than Significant Impact with Mitigation Incorporated. The potential for adverse direct or indirect impacts to human beings was considered throughout Chapter 3 of this MND. Based on this evaluation, there is no substantial evidence that construction or operation of the project with the proposed mitigation measures incorporated would result in a substantial adverse effect on human beings. Impacts would be less than significant with incorporation of mitigation measures.

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4 References and Preparers

4.1 References Cited
CAL FIRE (California Department of Forestry and Fire Protection). 2024. Fire Hazard Severity Zone Viewer. Accessed March 4, 2025. https://experience.arcgis.com/experience/03beab8511814e79a0e4eabf0d3e7247/.

Caltrans (California Department of Transportation). 2020. Transportation and Construction Vibration Guidance Manual. Accessed June 19, 2025. https://caltrans.maps.arcgis.com/apps/webappviewer/ index.html?id=465dfd3d807c46cc8e8057116f1aacaa.

Caltrans. 2024. California State Scenic Highway System Map. Accessed March 4, 2025. https://caltrans.maps.arcgis.com/apps/webappviewer/index.html?id= 465dfd3d807c46cc8e8057116f1aacaa.

CAPCOA (California Air Pollution Control Officers Association). 2008. CEQA & Climate Change: Evaluating and Addressing Greenhouse Gas Emissions from Projects Subject to the California Environmental Quality Act.

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CARB. 2025c. “Carbon Monoxide & Health.” Accessed June 19, 2025. https://ww2.arb.ca.gov/resources/ carbon-monoxide-and-health.

CARB. 2025d. “Inhalable Particulate Matter and Health (PM2.5 and PM10).” Accessed June 19, 2025. https://www.arb.ca.gov/research/aaqs/common-pollutants/pm/pm.htm.

CARB. 2025e. Advanced Clean Cars Program. Accessed June 19, 2025. https://ww2.arb.ca.gov/our-work/ programs/advanced-clean-cars-program/about.

CALAS PARK STORMWATER AND WATER QUALITY IMPROVEMENTS SUPPLEMENTAL ENVIRONMENTAL

PROJECT / INITIAL STUDY/MITIGATED NEGATIVE DECLARATION
17283 90
DECEMBER 2025
CDFW (California Department of Fish and Wildlife). 2019. California Natural Community Conservation Plans.

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City of Carson. 2013. Carson Master Plan of Bikeways. August 2013. Accessed March 12, 2025. https://ci.carson.ca.us/content/files/pdfs/planning/BikeMasterPlan.pdf.

City of Carson. 2017. City of Carson Zoning. August 1, 2017. Accessed February 27, 2025. https://gis.carson.ca.us/pdfs/mapgallery/Zoning_11x17.pdf City of Carson. 2022. Carson 2040 Draft Environmental Impact Report. September 2022. Accessed March 12, 2024. https://www.dropbox.com/scl/fi/9ngm92zchyywgqjejx5mz/Carson-GP-Update-Draft- EIR.pdf?rlkey=0n21q6wsfz1365qme8qcfxr2z&e=1&dl=0.

City of Carson. 2023. City of Carson 2040 General Plan. Adopted April 4, 2023. Accessed March 12, 2025. https://drive.google.com/file/d/1Ka9ZF0ELbms4wTO-Aquk3mQ1MJCaRkbm/view.

City of Carson. 2024. Draft 2024 City of Carson Hazard Mitigation Plan. Accessed March 11, 2025. https://ci.carson.ca.us/content/files/pdfs/publicsafety/NaturalHazardsMPlan/DRAFT_City%20of% 20Carson%20Hazard%20Mitigation%20Plan%202024.pdf.

Cohen, K.M., S.C. Finney, P.L. Gibbard, and J.-X. Fan. 2024. “The ICS International Chronostratigraphic Chart.” Episodes 36: 199-204. Accessed March 18, 2025. https://stratigraphy.org/ICSchart/ ChronostratChart2024-12.pdf.

CNPS (California Native Plant Society). 2025. Inventory of Rare and Endangered Plants (online edition, v8-03).

Accessed August 5, 2025. www.rareplants.cnps.org.

CNRA (California Natural Resources Agency). 2009. Final Statement of Reasons for Regulatory Action:

Amendments to the State CEQA Guidelines Addressing Analysis and Mitigation of Greenhouse Gas Emissions Pursuant to SB 97. December 2009. Accessed July 5, 2025. http://resources.ca.gov/ ceqa/docs/Final_Statement_of_Reasons.pdf.

CALAS PARK STORMWATER AND WATER QUALITY IMPROVEMENTS SUPPLEMENTAL ENVIRONMENTAL

PROJECT / INITIAL STUDY/MITIGATED NEGATIVE DECLARATION
17283 91
DECEMBER 2025
Dibblee, T.W. Jr., H.E. Ehrenspeck, P.L. Ehlig, and W.L. Bartlett. 1999. “Geologic Map of the Palos Verdes Peninsula and Vicinity, Redondo Beach, Torrance, and San Pedro Quadrangles, Los Angeles County, California” [map]. 1:24,000. Dibblee Geological Foundation, Dibblee Foundation Map DF-70.

DC WMG (Dominguez Channel Watershed Management Area Group). 2016. Enhanced Watershed Management Program for the Dominguez Channel Watershed Management Area Group. February 2016.

DOC (California Department of Conservation). 2018. Earthquake Fault Zones: A Guide for Government Agencies, Property Owners/Developers, and Geoscience Practitioners for Assessing Fault Rupture Hazards in California. Accessed March 4, 2025. https://www.conservation.ca.gov/cgs/documents/publications/ special-publications/SP_042-a11y.pdf.

DOC. 2025a. California Important Farmland Finder. Accessed February 27, 2025. https://maps.conservation.ca.gov/DLRP/CIFF/.

DOC. 2025b. “EQ Zapp. Earthquake Zones of Required Investigation.” Accessed March 4, 2025. https://maps.conservation.ca.gov/cgs/EQZApp/app/.

DOC. 2024c. CGS Information Warehouse: Tsunami Hazard Area Map. Accessed July 10, 2024. https://maps.conservation.ca.gov/cgs/informationwarehouse/ts_evacuation/.

DTSC (Department of Toxic Substances Control). 2025. EnviroStor Database. Accessed March 12, 2025. https://www.envirostor.dtsc.ca.gov/public/.

EPA (U.S. Environmental Protection Agency). 2025. “EPA Region 9 Air Quality Maps and Geographic Information.” Last Updated July 21, 2023. Accessed July 5, 2025. https://www3.epa.gov/region9/air/ maps/index.html.

EPA. 2025. “Monitor Values Report.” Last updated March 28, 2025. Accessed July 5, 2025. https://www.epa.gov/outdoor-air-quality-data/monitor-values-report.

FEMA (Federal Emergency Management Agency). 2008. “FEMA’s National Flood Hazard Layer (NFHL) Viewer” Effective September 25, 2008. Accessed March 11, 2025. https://hazards-fema.maps.arcgis.com/ apps/webappviewer/index.html?id=8b0adb51996444d4879338b5529aa9cd.

FTA (Federal Transit Administration). 2018. Transit Noise and Vibration Impact Assessment Manual. FTA Report No. 0123. Office of Planning and Environment. U.S. Department of Transportation. Washington, D.C.

September 2018.

IPCC (Intergovernmental Panel on Climate Change). 2007. Climate Change 2007: The Physical Science Basis.

Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change. Edited by S. Solomon, D. Qin, M. Manning, Z. Chen, M. Marquis, K.B. Averyt, M. Tignor and H.L. Miller. Cambridge, United Kingdom, and New York, New York: Cambridge University Press. Accessed July 1, 2025. https://www.ipcc.ch/site/assets/uploads/2018/05/ar4_wg1_full_report-1.pdf.

CALAS PARK STORMWATER AND WATER QUALITY IMPROVEMENTS SUPPLEMENTAL ENVIRONMENTAL

PROJECT / INITIAL STUDY/MITIGATED NEGATIVE DECLARATION
17283 92
DECEMBER 2025
LCI (California Governor’s Office of Land Use and Climate Innovation). 2018. Technical Advisory on Evaluating Transportation Impacts in CEQA. December 2018. Accessed March 12, 2025. https://lci.ca.gov/docs/ 20190122-743_Technical_Advisory.pdf.

Los Angeles County Public Works. 2020. Los Angeles County Public Works Transportation Impact Analysis Guidelines. July 23, 2020. Accessed March 12, 2025. https://pw.lacounty.gov/traffic/ docs/Transportation-Impact-Analysis-Guidelines-July-2020-v1.1.pdf.

Meffe, G. K., & Carroll, C. R. (Eds.) (1997). Principles of Conservation Biology (2nd ed.). Sunderland, Massachusetts: Sinauer Associates Inc.

National Cancer Institute. 2025. “Cancer Statistics”. Updated May 7, 2025. Accessed June 30, 2025. https://www.cancer.gov/about-cancer/understanding/statistics.

NETR (National Environmental Title Research). 2025. Address search for Calas Park, Carson, California. Accessed February 12, 2025. http://www.historicaerials.com/.

NHMLA (Natural History Museum of Los Angeles). 2025. “Paleontological Resources Records Search for the Calas Park Project.” Records search letter from the Natural History Museum of Los Angeles County, Los Angeles, California. March 9, 2025. Alyssa Bell, Ph.D. CONFIDENTIAL.

Ninyo & Moore. 2025. Geotechnical Evaluation for Calas Park Stormwater and Water Quality Improvement Project, 1000 E. 220th Street, Carson, California. Prepared for Craftwater Engineering, Inc.

January 31, 2025.

OEHHA (Office of Environmental Health Hazard Assessment). 2015. Air Toxics Hot Spots Program Risk Assessment Guidelines Guidance Manual for Preparation of Health Risk Assessments. February 2015. Accessed July 1, 2025. https://oehha.ca.gov/media/downloads/crnr/2015guidancemanual.pdf.

PBDB (Paleobiology Database). 2025. Search parameters, Country=“United States”, State= “California”, County = “Los Angeles”. Accessed March 11, 2025.

Saucedo, G.J., G.H. Greene, M.P. Kennedy, and S.P. Bezore. 2016. “Geologic Map of the Long Beach 30-Minute × 60-Minute Quadrangle, California” [map]. Sacramento, California: California Geological Survey.

SCAG (Southern California Association of Governments). 2020. Connect SoCal: The 2020-2045 Regional Transportation Plan/Sustainable Communities Strategy of the Southern California Association of Governments. Adopted September 3, 2020. Accessed July 5, 2025. https://scag.ca.gov/sites/ main/files/file-attachments/0903fconnectsocal-plan_0.pdf?1606001176.

SCAG. 2024. Connect SoCal 2024. The 2024–2050 Regional Transportation Plan/Sustainable Communities Strategy of the Southern California Association of Government. Adopted April 4, 2024. Accessed July 5, 2025. https://scag.ca.gov/sites/main/files/file-attachments/23-2987-connect-socal-2024-final- complete-040424.pdf?1714175547.

CALAS PARK STORMWATER AND WATER QUALITY IMPROVEMENTS SUPPLEMENTAL ENVIRONMENTAL

PROJECT / INITIAL STUDY/MITIGATED NEGATIVE DECLARATION
17283 93
DECEMBER 2025
SCAQMD (South Coast Air Quality Management District). 1993. CEQA Air Quality Handbook. Accessed July 5, 2025. http://www.aqmd.gov/home/rules-compliance/ceqa/air-quality-analysis-handbook/ ceqa-air-quality-handbook-(1993).

SCAQMD. 2003. Final 2003 Air Quality Management Plan, Appendix V Modeling and Attainment Demonstrations.

August 2003. Accessed July 5, 2025. https://www.aqmd.gov/docs/default-source/clean-air-plans/ air-quality-management-plans/2003-air-quality-management-plan/2003-aqmp-appendix-v.pdf?sfvrsn=2.

SCAQMD. 2008a. Final Localized Significance Threshold Methodology. Revised July 2008. Accessed July 5, 2025. http://www.aqmd.gov/docs/default-source/ceqa/handbook/localized-significance-thresholds/ final-lst-methodology-document.pdf.

SCAQMD. 2008b. Interim CEQA GHG Significance Threshold for Stationary Sources, Rules and Plans.

December 5, 2008. Accessed July 5, 2025. http://www.aqmd.gov/docs/default-source/ceqa/ handbook/greenhouse-gases-(ghg)-ceqa-significance-thresholds/ghgboardsynopsis.pdf?sfvrsn=2.

SCAQMD. 2010. Greenhouse Gas CEQA Significance Threshold Stakeholder Working Group Meeting #15.

September 28. Accessed July 5, 2025. http://www.aqmd.gov/docs/default-source/ceqa/handbook/ greenhouse-gases-(ghg)-ceqa-significance-thresholds/year-2008-2009/ghg-meeting-15/ghg-meeting- 15-main-presentation.pdf?sfvrsn=2.

SCAQMD. 2022. 2022 Air Quality Management Plan. Adopted December 2, 2022. Accessed July 5, 2025. http://www.aqmd.gov/docs/default-source/clean-air-plans/air-quality-management-plans/ 2022-air-quality-management-plan/final-2022-aqmp/final-2022-aqmp.pdf?sfvrsn=16.

SCAQMD. 2023. South Coast AQMD Air Quality Significance Thresholds. Revised March 2023. Accessed July 1, 2025. https://www.aqmd.gov/docs/default-source/ceqa/handbook/south-coast-aqmd-air-quality- significance-thresholds.pdf?sfvrsn=25.

SCAQMD. 2025a. “SCAQMD Modeling Guidance for AERMOD.” Accessed July 5, 2025. https://www.aqmd.gov/home/air-quality/meteorological-data/modeling-guidance.

SCAQMD. 2025b. “Health Risk Assessment Tool and AERMOD-Ready Meteorological Data Files.” Last updated March 1, 2025. Accessed June 30, 2025. https://www.aqmd.gov/assets/aermet/ AERMET_files_And_HRA_Tool.html.

SCAQMD. n.d. Fact Sheet for Applying CalEEMod to Localized Significance Thresholds. Accessed July 5, 2025. https://www.aqmd.gov/docs/default-source/ceqa/handbook/localized-significance-thresholds/ caleemod-guidance.pdf?sfvrsn=2.

The Climate Registry. 2025. 2025 Default Emission Factors. February 2025. Accessed June 30, 2025. https://theclimateregistry.org/wp-content/uploads/2025/03/2025-Default-Emission-Factors-03-2025.pdf.

U.S. Census Bureau. 2020. “Quick Facts, Compton city, California; Carson city, California; United States.” April 1, 2020. Accessed February 27, 2025. https://www.census.gov/quickfacts/fact/table/ comptoncitycalifornia,carsoncitycalifornia/PST045224.

CALAS PARK STORMWATER AND WATER QUALITY IMPROVEMENTS SUPPLEMENTAL ENVIRONMENTAL

PROJECT / INITIAL STUDY/MITIGATED NEGATIVE DECLARATION
17283 94
DECEMBER 2025
USDA (U.S. Department of Agriculture). 2025. Web Soil Survey. Accessed August 2025. https://websoilsurvey.sc.egov.usda.gov/App/WebSoilSurvey.aspx.

USFWS (U.S. Fish and Wildlife Service). 2025a. Information, Planning, and Conservation System (IPaC). Accessed August 2025. https://ecos.fws.gov/ipac/.

USFWS. 2025b. Wetlands Mapper. Accessed August 2025. https://www.fws.gov/wetlands/data/mapper.html.

USGS (U.S. Geological Survey). 2025. Mineral Resources Online Spatial Data. Accessed February 27,2025. https://mrdata.usgs.gov/general/map-us.html#home.

4.2 List of Preparers
City of Carson
Roland Jen, P.E. – Stormwater Engineer
Aaron Whiting – Associate Planner
Dudek
Alex Hardy – Senior Project Manager
Connor Burke – Environmental Acoustician
Ryan Glenn, MA, RPA – Archaeologist
Jason Greenstein – Geospatial Analyst
Shawna Johnson – Paleontologist
Ames Noll – Air Quality Specialist
Nathan Reid – Geospatial Analyst
Hayley Rundle – Deputy Project Manager / Environmental Planner Eilleen Salas – Biologist

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DECEMBER 2025

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DECEMBER 2025

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Appendix A
Air Quality and Greenhouse Gas Modeling

Table of Contents
Calas Park Stormwater Capture Project Detailed Report 2 Calas Park Stormwater Capture Project LST Detailed Report 52 Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 1 / 50
Calas Park Stormwater Capture Project Detailed Report
Table of Contents

1. Basic Project Information

1.1. Basic Project Information

1.2. Land Use Types

1.3. User-Selected Emission Reduction Measures by Emissions Sector

2. Emissions Summary

2.1. Construction Emissions Compared Against Thresholds

2.2. Construction Emissions by Y ear, Unmitigated

2.4. Operations Emissions Compared Against Thresholds

2.5. Operations Emissions by Sector, Unmitigated

3. Construction Emissions Details

3.1. Demolition (2026) - Unmitigated

3.3. Site Preparation (2026) - Unmitigated

3.5. Reservoir Excavation (2027) - Unmitigated

3.7. Outlet Line (2027) - Unmitigated

3.9. Reservoir Construction (2027) - Unmitigated
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 2 / 50

3.11. Pipe/Diversion/Treatment Facility/Pump/Bioswale (2027) - Unmitigated

3.13. Field/Bioswale/Landscaping (2027) - Unmitigated

4. Operations Emissions Details

4.1. Mobile Emissions by Land Use

4.1.1. Unmitigated

4.2. Energy

4.2.1. Electricity Emissions By Land Use - Unmitigated

4.2.3. Natural Gas Emissions By Land Use - Unmitigated

4.3. Area Emissions by Source

4.3.1. Unmitigated

4.4. Water Emissions by Land Use

4.4.1. Unmitigated

4.5. Waste Emissions by Land Use

4.5.1. Unmitigated

4.6. Refrigerant Emissions by Land Use

4.6.1. Unmitigated

4.7. Offroad Emissions By Equipment Type

4.7.1. Unmitigated
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 3 / 50

4.8. Stationary Emissions By Equipment Type

4.8.1. Unmitigated

4.9. User Defined Emissions By Equipment Type

4.9.1. Unmitigated

4.10. Soil Carbon Accumulation By Vegetation Type

4.10.1. Soil Carbon Accumulation By Vegetation Type - Unmitigated

4.10.2. Above and Belowground Carbon Accumulation by Land Use Type - Unmitigated

4.10.3. Avoided and Sequestered Emissions by Species - Unmitigated

5. Activity Data

5.1. Construction Schedule

5.2. Off-Road Equipment

5.2.1. Unmitigated

5.3. Construction Vehicles

5.3.1. Unmitigated

5.4. Vehicles

5.4.1. Construction Vehicle Control Strategies

5.5. Architectural Coatings

5.6. Dust Mitigation
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 4 / 50

5.6.1. Construction Earthmoving Activities

5.6.2. Construction Earthmoving Control Strategies

5.7. Construction Paving

5.8. Construction Electricity Consumption and Emissions Factors

5.9. Operational Mobile Sources

5.9.1. Unmitigated

5.10. Operational Area Sources

5.10.1. Hearths

5.10.1.1. Unmitigated

5.10.2. Architectural Coatings

5.10.3. Landscape Equipment

5.11. Operational Energy Consumption

5.11.1. Unmitigated

5.12. Operational Water and Wastewater Consumption

5.12.1. Unmitigated

5.13. Operational Waste Generation

5.13.1. Unmitigated

5.14. Operational Refrigeration and Air Conditioning Equipment Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 5 / 50

5.14.1. Unmitigated

5.15. Operational Off-Road Equipment

5.15.1. Unmitigated

5.16. Stationary Sources

5.16.1. Emergency Generators and Fire Pumps

5.16.2. Process Boilers

5.17. User Defined

5.18. Vegetation

5.18.1. Land Use Change

5.18.1.1. Unmitigated

5.18.1. Biomass Cover Type

5.18.1.1. Unmitigated

5.18.2. Sequestration

5.18.2.1. Unmitigated

6. Climate Risk Detailed Report

6.1. Climate Risk Summary

6.2. Initial Climate Risk Scores

6.3. Adjusted Climate Risk Scores
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 6 / 50

6.4. Climate Risk Reduction Measures

7. Health and Equity Details

7.1. CalEnviroScreen 4.0 Scores

7.2. Healthy Places Index Scores

7.3. Overall Health & Equity Scores

7.4. Health & Equity Measures

7.5. Evaluation Scorecard

7.6. Health & Equity Custom Measures

8. User Changes to Default Data
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 7 / 50

1. Basic Project Information

1.1. Basic Project Information
Data Field Value
Project Name Calas Park Stormwater Capture Project
Construction Start Date 10/1/2026
Operational Y ear 2028
Lead Agency —
Land Use Scale Project/site
Analysis Level for Defaults County
Windspeed (m/s) 3.50
Precipitation (days) 17.4
Location 33.827447691220186, -118.2571402051142
County Los Angeles-South Coast
City Carson
Air District South Coast AQMD
Air Basin South Coast
TAZ 4617
EDFZ 7
Electric Utility Southern California Edison
Gas Utility Southern California Gas
App Version 2022.1.1.29

1.2. Land Use Types
Land Use Subtype Size Unit Lot Acreage Building Area (sq ft) Landscape Area (sq ft)
Special Landscape
Area
(sq ft)
Population Description
City Park 5.72 Acre 5.72 0.00 6,620 6,620 — Park fields Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 8 / 50
Other Asphalt
Surf
aces

3.26 1000sqft 0.07 0.00 0.00 — — Pavement
Other Non-Asphalt
Surf
aces

3.49 1000sqft 0.08 0.00 0.00 — — Concrete sidewalks

1.3. User-Selected Emission Reduction Measures by Emissions Sector No measures selected

2. Emissions Summary

2.1. Construction Emissions Compared Against Thresholds Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Un/Mit. TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 5.48 4.59 42.4 49.2 0.08 1.72 5.79 7.36 1.58 2.79 4.34 — 9,377 9,377 0.39 0.19 2.80 9,445 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 7.22 6.04 54.7 55.7 0.10 2.35 8.32 10.7 2.16 4.10 6.26 — 10,805 10,805 0.45 0.21 0.08 10,878 Average
Daily
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 1.68 1.40 12.8 14.9 0.03 0.50 1.61 2.11 0.46 0.77 1.23 — 2,956 2,956 0.12 0.06 0.41 2,977 Annual
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 0.31 0.26 2.33 2.71 < 0.005 0.09 0.29 0.39 0.08 0.14 0.23 — 489 489 0.02 0.01 0.07 493

2.2. Construction Emissions by Y ear, Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Y ear TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 9 / 50
Daily -
Summer
(Max)
— — — — — — — — — — — — — — — — — —
2027 5.48 4.59 42.4 49.2 0.08 1.72 5.79 7.36 1.58 2.79 4.34 — 9,377 9,377 0.39 0.19 2.80 9,445 Daily -
Winter
(Max)
— — — — — — — — — — — — — — — — — —
2026 7.22 6.04 54.7 55.7 0.10 2.35 8.32 10.7 2.16 4.10 6.26 — 10,805 10,805 0.45 0.21 0.08 10,878 2027 5.48 4.58 42.5 44.1 0.08 1.72 5.64 7.36 1.58 2.76 4.34 — 9,359 9,359 0.38 0.19 0.07 9,425 Average
Daily
— — — — — — — — — — — — — — — — — —
2026 0.74 0.62 5.59 5.69 0.01 0.24 0.57 0.82 0.23 0.28 0.50 — 1,107 1,107 0.05 0.02 0.14 1,115 2027 1.68 1.40 12.8 14.9 0.03 0.50 1.61 2.11 0.46 0.77 1.23 — 2,956 2,956 0.12 0.06 0.41 2,977 Annual — — — — — — — — — — — — — — — — — —
2026 0.14 0.11 1.02 1.04 < 0.005 0.04 0.10 0.15 0.04 0.05 0.09 — 183 183 0.01 < 0.005 0.02 185 2027 0.31 0.26 2.33 2.71 < 0.005 0.09 0.29 0.39 0.08 0.14 0.23 — 489 489 0.02 0.01 0.07 493

2.4. Operations Emissions Compared Against Thresholds
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Un/Mit. TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 0.02 0.02 0.01 0.18 < 0.005 < 0.005 0.05 0.05 < 0.005 0.01 0.01 0.00 136 136 0.01 < 0.005 0.14 138 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 0.02 0.02 0.02 0.16 < 0.005 < 0.005 0.05 0.05 < 0.005 0.01 0.01 0.00 134 134 0.01 < 0.005 < 0.005 135 Average
Daily
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 0.02 0.02 0.02 0.17 < 0.005 < 0.005 0.05 0.05 < 0.005 0.01 0.01 0.00 130 130 0.01 < 0.005 0.06 131 Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 10 / 50
Annual
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. < 0.005 < 0.005 < 0.005 0.03 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 0.00 21.5 21.5 < 0.005 < 0.005 0.01 21.7

2.5. Operations Emissions by Sector, Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Sector TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Mobile 0.02 0.01 0.01 0.18 < 0.005 < 0.005 0.05 0.05 < 0.005 0.01 0.01 — 49.5 49.5 < 0.005 < 0.005 0.14 50.2 Area < 0.005 < 0.005 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Energy 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 87.0 87.0 0.01 < 0.005 — 87.5 Water — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00 Waste — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00 Off-Roa
d

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Total 0.02 0.02 0.01 0.18 < 0.005 < 0.005 0.05 0.05 < 0.005 0.01 0.01 0.00 136 136 0.01 < 0.005 0.14 138 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Mobile 0.02 0.01 0.02 0.16 < 0.005 < 0.005 0.05 0.05 < 0.005 0.01 0.01 — 47.4 47.4 < 0.005 < 0.005 < 0.005 48.0 Area < 0.005 < 0.005 — — — — — — — — — — — — — — — —
Energy 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 87.0 87.0 0.01 < 0.005 — 87.5 Water — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00 Waste — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00 Off-Roa
d

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Total 0.02 0.02 0.02 0.16 < 0.005 < 0.005 0.05 0.05 < 0.005 0.01 0.01 0.00 134 134 0.01 < 0.005 < 0.005 135 Average
Daily
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 11 / 50
Mobile 0.02 0.01 0.02 0.17 < 0.005 < 0.005 0.05 0.05 < 0.005 0.01 0.01 — 48.0 48.0 < 0.005 < 0.005 0.06 48.6 Area < 0.005 < 0.005 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Energy 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 82.1 82.1 0.01 < 0.005 — 82.6 Water — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00 Waste — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00 Off-Roa
d

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Total 0.02 0.02 0.02 0.17 < 0.005 < 0.005 0.05 0.05 < 0.005 0.01 0.01 0.00 130 130 0.01 < 0.005 0.06 131 Annual — — — — — — — — — — — — — — — — — —
Mobile < 0.005 < 0.005 < 0.005 0.03 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 — 7.95 7.95 < 0.005 < 0.005 0.01 8.05 Area < 0.005 < 0.005 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Energy 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 13.6 13.6 < 0.005 < 0.005 — 13.7 Water — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00 Waste — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00 Off-Roa
d

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Total < 0.005 < 0.005 < 0.005 0.03 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 0.00 21.5 21.5 < 0.005 < 0.005 0.01 21.7

3. Construction Emissions Details

3.1. Demolition (2026) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 12 / 50
Off-Roa
Equipment

3.05 2.56 22.9 22.9 0.04 1.06 — 1.06 0.98 — 0.98 — 4,139 4,139 0.17 0.03 — 4,153 Demoliti
on
— — — — — — 0.06 0.06 — 0.01 0.01 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.46 0.39 3.46 3.45 0.01 0.16 — 0.16 0.15 — 0.15 — 624 624 0.03 0.01 — 626 Demoliti
on
— — — — — — 0.01 0.01 — < 0.005 < 0.005 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.08 0.07 0.63 0.63 < 0.005 0.03 — 0.03 0.03 — 0.03 — 103 103 < 0.005 < 0.005 — 104 Demoliti
on
— — — — — — < 0.005 < 0.005 — < 0.005 < 0.005 — — — — — — — Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.07 0.06 0.06 0.73 0.00 0.00 0.16 0.16 0.00 0.04 0.04 — 159 159 0.01 0.01 0.01 161 Vendor 0.01 < 0.005 0.12 0.06 < 0.005 < 0.005 0.03 0.03 < 0.005 0.01 0.01 — 95.8 95.8 < 0.005 0.01 0.01 100 Hauling 0.02 < 0.005 0.34 0.13 < 0.005 < 0.005 0.07 0.08 < 0.005 0.02 0.02 — 272 272 0.02 0.04 0.02 286 Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 13 / 50
Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.01 0.01 0.01 0.11 0.00 0.00 0.02 0.02 0.00 0.01 0.01 — 24.3 24.3 < 0.005 < 0.005 0.04 24.6 Vendor < 0.005 < 0.005 0.02 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 14.4 14.4 < 0.005 < 0.005 0.02 15.1 Hauling < 0.005 < 0.005 0.05 0.02 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 — 41.0 41.0 < 0.005 0.01 0.04 43.1 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.02 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 4.02 4.02 < 0.005 < 0.005 0.01 4.07 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 2.39 2.39 < 0.005 < 0.005 < 0.005 2.50 Hauling < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 6.79 6.79 < 0.005 < 0.005 0.01 7.13

3.3. Site Preparation (2026) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

3.95 3.32 30.7 30.6 0.05 1.28 — 1.28 1.18 — 1.18 — 5,542 5,542 0.22 0.04 — 5,561 Dust
F
rom
Material
Movement
— — — — — — 7.67 7.67 — 3.94 3.94 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 14 / 50
366—< 0.0050.01364364—0.08—0.080.08—0.08< 0.0052.012.020.220.26Off-Roa d
Dust
F
rom
Material
Movement
— — — — — — 0.50 0.50 — 0.26 0.26 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.05 0.04 0.37 0.37 < 0.005 0.02 — 0.02 0.01 — 0.01 — 60.3 60.3 < 0.005 < 0.005 — 60.5 Dust
F
rom
Material
Movement
— — — — — — 0.09 0.09 — 0.05 0.05 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.10 0.09 0.08 1.05 0.00 0.00 0.23 0.23 0.00 0.05 0.05 — 229 229 0.01 0.01 0.02 232 Vendor 0.01 < 0.005 0.12 0.06 < 0.005 < 0.005 0.03 0.03 < 0.005 0.01 0.01 — 95.8 95.8 < 0.005 0.01 0.01 100 Hauling 0.02 < 0.005 0.34 0.13 < 0.005 < 0.005 0.07 0.08 < 0.005 0.02 0.02 — 272 272 0.02 0.04 0.02 286 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.01 0.01 0.01 0.07 0.00 0.00 0.02 0.02 0.00 < 0.005 < 0.005 — 15.3 15.3 < 0.005 < 0.005 0.02 15.5 Vendor < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 6.30 6.30 < 0.005 < 0.005 0.01 6.58 Hauling < 0.005 < 0.005 0.02 0.01 < 0.005 < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 — 17.9 17.9 < 0.005 < 0.005 0.02 18.8 Annual — — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 15 / 50
Worker < 0.005 < 0.005 < 0.005 0.01 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 2.53 2.53 < 0.005 < 0.005 < 0.005 2.57 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.04 1.04 < 0.005 < 0.005 < 0.005 1.09 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 2.96 2.96 < 0.005 < 0.005 < 0.005 3.11

3.5. Reservoir Excavation (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.60 2.19 20.6 22.5 0.04 0.83 — 0.83 0.77 — 0.77 — 4,119 4,119 0.17 0.03 — 4,133 Dust
F
rom
Material
Movement
— — — — — — 5.11 5.11 — 2.63 2.63 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.60 2.19 20.6 22.5 0.04 0.83 — 0.83 0.77 — 0.77 — 4,119 4,119 0.17 0.03 — 4,133 Dust
F
rom
Material
Movement
— — — — — — 5.11 5.11 — 2.63 2.63 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 16 / 50
——————————————————Average
Daily
Off-Roa
d
Equipm
ent

0.55 0.46 4.35 4.75 0.01 0.18 — 0.18 0.16 — 0.16 — 869 869 0.04 0.01 — 872 Dust
F
rom
Material
Movement
— — — — — — 1.08 1.08 — 0.55 0.55 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.10 0.08 0.79 0.87 < 0.005 0.03 — 0.03 0.03 — 0.03 — 144 144 0.01 < 0.005 — 144 Dust
F
rom
Material
Movement
— — — — — — 0.20 0.20 — 0.10 0.10 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.09 0.08 0.06 1.03 0.00 0.00 0.21 0.21 0.00 0.05 0.05 — 219 219 0.01 0.01 0.68 222 Vendor 0.01 < 0.005 0.11 0.05 < 0.005 < 0.005 0.03 0.03 < 0.005 0.01 0.01 — 93.9 93.9 < 0.005 0.01 0.24 98.1 Hauling 0.04 0.01 0.63 0.25 < 0.005 0.01 0.15 0.16 0.01 0.04 0.05 — 533 533 0.03 0.09 1.13 561 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.09 0.08 0.08 0.89 0.00 0.00 0.21 0.21 0.00 0.05 0.05 — 208 208 < 0.005 0.01 0.02 210 Vendor 0.01 < 0.005 0.11 0.06 < 0.005 < 0.005 0.03 0.03 < 0.005 0.01 0.01 — 94.0 94.0 < 0.005 0.01 0.01 98.0 Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 17 / 50
Hauling 0.04 0.01 0.66 0.25 < 0.005 0.01 0.15 0.16 0.01 0.04 0.05 — 534 534 0.03 0.09 0.03 560 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.02 0.02 0.02 0.20 0.00 0.00 0.04 0.04 0.00 0.01 0.01 — 44.4 44.4 < 0.005 < 0.005 0.06 45.0 Vendor < 0.005 < 0.005 0.02 0.01 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 — 19.8 19.8 < 0.005 < 0.005 0.02 20.7 Hauling 0.01 < 0.005 0.14 0.05 < 0.005 < 0.005 0.03 0.03 < 0.005 0.01 0.01 — 113 113 0.01 0.02 0.10 118 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.04 0.00 0.00 0.01 0.01 0.00 < 0.005 < 0.005 — 7.36 7.36 < 0.005 < 0.005 0.01 7.46 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.28 3.28 < 0.005 < 0.005 < 0.005 3.42 Hauling < 0.005 < 0.005 0.03 0.01 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 — 18.6 18.6 < 0.005 < 0.005 0.02 19.6

3.7. Outlet Line (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.60 2.19 20.6 22.5 0.04 0.83 — 0.83 0.77 — 0.77 — 4,119 4,119 0.17 0.03 — 4,133 Dust
F
rom
Material
Movement
— — — — — — 5.11 5.11 — 2.63 2.63 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 18 / 50
Off-Roa
Equipment

0.16 0.14 1.30 1.42 < 0.005 0.05 — 0.05 0.05 — 0.05 — 260 260 0.01 < 0.005 — 260 Dust
F
rom
Material
Movement
— — — — — — 0.32 0.32 — 0.17 0.17 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.03 0.03 0.24 0.26 < 0.005 0.01 — 0.01 0.01 — 0.01 — 43.0 43.0 < 0.005 < 0.005 — 43.1 Dust
F
rom
Material
Movement
— — — — — — 0.06 0.06 — 0.03 0.03 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.07 0.06 0.05 0.78 0.00 0.00 0.16 0.16 0.00 0.04 0.04 — 164 164 0.01 0.01 0.51 167 Vendor 0.01 < 0.005 0.11 0.05 < 0.005 < 0.005 0.03 0.03 < 0.005 0.01 0.01 — 93.9 93.9 < 0.005 0.01 0.24 98.1 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.04 0.00 0.00 0.01 0.01 0.00 < 0.005 < 0.005 — 9.95 9.95 < 0.005 < 0.005 0.01 10.1 Vendor < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 5.92 5.92 < 0.005 < 0.005 0.01 6.18 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 19 / 50
Worker < 0.005 < 0.005 < 0.005 0.01 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 1.65 1.65 < 0.005 < 0.005 < 0.005 1.67 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.98 0.98 < 0.005 < 0.005 < 0.005 1.02 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

3.9. Reservoir Construction (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.69 2.26 20.9 19.8 0.04 0.88 — 0.88 0.81 — 0.81 — 4,238 4,238 0.17 0.03 — 4,252 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.69 2.26 20.9 19.8 0.04 0.88 — 0.88 0.81 — 0.81 — 4,238 4,238 0.17 0.03 — 4,252 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.41 0.34 3.15 2.99 0.01 0.13 — 0.13 0.12 — 0.12 — 639 639 0.03 0.01 — 641 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 20 / 50
Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.07 0.06 0.58 0.54 < 0.005 0.02 — 0.02 0.02 — 0.02 — 106 106 < 0.005 < 0.005 — 106 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.05 0.05 0.04 0.60 0.00 0.00 0.12 0.12 0.00 0.03 0.03 — 128 128 0.01 < 0.005 0.40 130 Vendor < 0.005 < 0.005 0.05 0.03 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 — 47.0 47.0 < 0.005 0.01 0.12 49.1 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.05 0.05 0.04 0.52 0.00 0.00 0.12 0.12 0.00 0.03 0.03 — 121 121 < 0.005 < 0.005 0.01 123 Vendor < 0.005 < 0.005 0.06 0.03 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 — 47.0 47.0 < 0.005 0.01 < 0.005 49.0 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.01 0.01 0.01 0.08 0.00 0.00 0.02 0.02 0.00 < 0.005 < 0.005 — 18.5 18.5 < 0.005 < 0.005 0.03 18.8 Vendor < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.08 7.08 < 0.005 < 0.005 0.01 7.39 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.02 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 3.06 3.06 < 0.005 < 0.005 < 0.005 3.11 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.17 1.17 < 0.005 < 0.005 < 0.005 1.22 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

3.11. Pipe/Diversion/Treatment Facility/Pump/Bioswale (2027) - Unmitigated Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 21 / 50
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.97 0.82 7.34 8.88 0.02 0.26 — 0.26 0.24 — 0.24 — 1,895 1,895 0.08 0.02 — 1,901 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.15 0.12 1.11 1.34 < 0.005 0.04 — 0.04 0.04 — 0.04 — 286 286 0.01 < 0.005 — 287 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.03 0.02 0.20 0.24 < 0.005 0.01 — 0.01 0.01 — 0.01 — 47.3 47.3 < 0.005 < 0.005 — 47.4 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.07 0.06 0.05 0.78 0.00 0.00 0.16 0.16 0.00 0.04 0.04 — 164 164 0.01 0.01 0.51 167 Vendor < 0.005 < 0.005 0.05 0.03 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 — 47.0 47.0 < 0.005 0.01 0.12 49.1 Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 22 / 50
Hauling 0.02 < 0.005 0.32 0.13 < 0.005 < 0.005 0.07 0.08 < 0.005 0.02 0.02 — 267 267 0.01 0.04 0.57 281 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.01 0.01 0.01 0.11 0.00 0.00 0.02 0.02 0.00 0.01 0.01 — 23.8 23.8 < 0.005 < 0.005 0.03 24.1 Vendor < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.08 7.08 < 0.005 < 0.005 0.01 7.39 Hauling < 0.005 < 0.005 0.05 0.02 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 — 40.2 40.2 < 0.005 0.01 0.04 42.2 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.02 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 3.94 3.94 < 0.005 < 0.005 0.01 3.99 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.17 1.17 < 0.005 < 0.005 < 0.005 1.22 Hauling < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 6.65 6.65 < 0.005 < 0.005 0.01 6.99

3.13. Field/Bioswale/Landscaping (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

1.39 1.17 10.6 14.9 0.02 0.42 — 0.42 0.38 — 0.38 — 2,271 2,271 0.09 0.02 — 2,279 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 23 / 50
2,279—0.020.092,2712,271—0.38—0.380.42—0.420.0214.910.61.171.39Off-Roa d
Equipm
ent
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.34 0.28 2.55 3.60 0.01 0.10 — 0.10 0.09 — 0.09 — 548 548 0.02 < 0.005 — 549 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.06 0.05 0.47 0.66 < 0.005 0.02 — 0.02 0.02 — 0.02 — 90.7 90.7 < 0.005 < 0.005 — 91.0 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.09 0.09 0.07 1.12 0.00 0.00 0.23 0.23 0.00 0.05 0.05 — 237 237 0.01 0.01 0.73 241 Vendor < 0.005 < 0.005 0.05 0.03 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 — 47.0 47.0 < 0.005 0.01 0.12 49.1 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.09 0.08 0.08 0.97 0.00 0.00 0.23 0.23 0.00 0.05 0.05 — 225 225 < 0.005 0.01 0.02 228 Vendor < 0.005 < 0.005 0.06 0.03 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 — 47.0 47.0 < 0.005 0.01 < 0.005 49.0 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 24 / 50
——————————————————Average
Daily
Worker 0.02 0.02 0.02 0.24 0.00 0.00 0.06 0.06 0.00 0.01 0.01 — 55.0 55.0 < 0.005 < 0.005 0.08 55.8 Vendor < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 11.3 11.3 < 0.005 < 0.005 0.01 11.8 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.04 0.00 0.00 0.01 0.01 0.00 < 0.005 < 0.005 — 9.11 9.11 < 0.005 < 0.005 0.01 9.23 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.87 1.87 < 0.005 < 0.005 < 0.005 1.96 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

4. Operations Emissions Details

4.1. Mobile Emissions by Land Use

4.1.1. Unmitigated
Mobile source emissions results are presented in Sections 2.6. No further detailed breakdown of emissions is available.

4.2. Energy

4.2.1. Electricity Emissions By Land Use - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land
Use
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
City
P
ark
— — — — — — — — — — — — 0.00 0.00 0.00 0.00 — 0.00
Other
Asphalt
Surf
aces
— — — — — — — — — — — — 0.00 0.00 0.00 0.00 — 0.00
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 25 / 50

0.00—0.000.000.000.00————————————Other
Non-Asphalt
Surf
aces
undefine
d
— — — — — — — — — — — — 87.0 87.0 0.01 < 0.005 — 87.5
Total — — — — — — — — — — — — 87.0 87.0 0.01 < 0.005 — 87.5 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
City
P
ark
— — — — — — — — — — — — 0.00 0.00 0.00 0.00 — 0.00
Other
Asphalt
Surf
aces
— — — — — — — — — — — — 0.00 0.00 0.00 0.00 — 0.00
Other
Non-Asphalt
Surf
aces
— — — — — — — — — — — — 0.00 0.00 0.00 0.00 — 0.00
undefine
d
— — — — — — — — — — — — 87.0 87.0 0.01 < 0.005 — 87.5
Total — — — — — — — — — — — — 87.0 87.0 0.01 < 0.005 — 87.5 Annual — — — — — — — — — — — — — — — — — —
City
P
ark
— — — — — — — — — — — — 0.00 0.00 0.00 0.00 — 0.00
Other
Asphalt
Surf
aces
— — — — — — — — — — — — 0.00 0.00 0.00 0.00 — 0.00
Other
Non-Asphalt
Surf
aces
— — — — — — — — — — — — 0.00 0.00 0.00 0.00 — 0.00
undefine
d
— — — — — — — — — — — — 13.6 13.6 < 0.005 < 0.005 — 13.7 Total — — — — — — — — — — — — 13.6 13.6 < 0.005 < 0.005 — 13.7

4.2.3. Natural Gas Emissions By Land Use - Unmitigated
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 26 / 50
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land
Use
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
City
P
ark

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Other
Asphalt
Surf
aces

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Other
Non-Asphalt
Surf
aces

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Total 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
City
P
ark

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Other
Asphalt
Surf
aces

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Other
Non-Asphalt
Surf
aces

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Total 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Annual — — — — — — — — — — — — — — — — — —
City
P
ark

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Other
Asphalt
Surf
aces

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Other
Non-Asphalt
Surf
aces

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 27 / 50
Total 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00

4.3. Area Emissions by Source

4.3.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Source TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Consum
er
Product
s
< 0.005 < 0.005 — — — — — — — — — — — — — — — —
Architect
ur
al
Coating
s
< 0.005 < 0.005 — — — — — — — — — — — — — — — —
Landsca
pe
Equipm
ent

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Total < 0.005 < 0.005 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Consum
er
Product
s
< 0.005 < 0.005 — — — — — — — — — — — — — — — —
Architect
ur
al
Coating
s
< 0.005 < 0.005 — — — — — — — — — — — — — — — —
Total < 0.005 < 0.005 — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 28 / 50
Annual — — — — — — — — — — — — — — — — — —
Consum
er
Product
s
< 0.005 < 0.005 — — — — — — — — — — — — — — — —
Architect
ur
al
Coating
s
< 0.005 < 0.005 — — — — — — — — — — — — — — — —
Landsca
pe
Equipm
ent

0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Total < 0.005 < 0.005 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00

4.4. Water Emissions by Land Use

4.4.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land
Use
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
City
P
ark
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Other
Asphalt
Surf
aces
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Other
Non-Asphalt
Surf
aces
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Total — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00 Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 29 / 50
——————————————————Daily,
Winter
(Max)
City
P
ark
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Other
Asphalt
Surf
aces
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Other
Non-Asphalt
Surf
aces
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Total — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00 Annual — — — — — — — — — — — — — — — — — —
City
P
ark
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Other
Asphalt
Surf
aces
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Other
Non-Asphalt
Surf
aces
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Total — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00

4.5. Waste Emissions by Land Use

4.5.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land
Use
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
City
P
ark
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 30 / 50
Other
Asphalt
Surf
aces
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Other
Non-Asphalt
Surf
aces
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Total — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
City
P
ark
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Other
Asphalt
Surf
aces
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Other
Non-Asphalt
Surf
aces
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Total — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00 Annual — — — — — — — — — — — — — — — — — —
City
P
ark
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Other
Asphalt
Surf
aces
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Other
Non-Asphalt
Surf
aces
— — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00
Total — — — — — — — — — — — 0.00 0.00 0.00 0.00 0.00 — 0.00

4.6. Refrigerant Emissions by Land Use

4.6.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 31 / 50
Land
Use
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

4.7. Offroad Emissions By Equipment Type

4.7.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Equipm
ent
T
ype
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Pumps 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Total 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Pumps 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Total 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Annual — — — — — — — — — — — — — — — — — —
Pumps 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00 Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 32 / 50
Total 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 — 0.00 — 0.00 0.00 0.00 0.00 — 0.00

4.8. Stationary Emissions By Equipment Type

4.8.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Equipm
ent
T
ype
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

4.9. User Defined Emissions By Equipment Type

4.9.1. Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Equipm
ent
T
ype
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 33 / 50
——————————————————Daily,
Winter
(Max)
Total — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

4.10. Soil Carbon Accumulation By Vegetation Type

4.10.1. Soil Carbon Accumulation By Vegetation Type - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Vegetati
on
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

4.10.2. Above and Belowground Carbon Accumulation by Land Use Type - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land
Use
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
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Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

4.10.3. Avoided and Sequestered Emissions by Species - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Species TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
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Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —

5. Activity Data

5.1. Construction Schedule
Phase Name Phase Type Start Date End Date Days Per Week Work Days per Phase Phase Description Demolition Demolition 10/1/2026 12/16/2026 5.00 55.0 —
Site Preparation Site Preparation 11/30/2026 12/31/2026 5.00 24.0 — Reservoir Excavation Grading 1/1/2027 4/19/2027 5.00 77.0 — Outlet Line Grading 8/1/2027 9/1/2027 5.00 23.0 —
Reservoir Construction Building Construction 3/16/2027 5/31/2027 5.00 55.0 — Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Building Construction 6/1/2027 8/16/2027 5.00 55.0 —
Field/Bioswale/Landscapi
ng
Building Construction 7/31/2027 12/1/2027 5.00 88.0 —

5.2. Off-Road Equipment
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5.2.1. Unmitigated
Phase Name Equipment Type Fuel Type Engine Tier Number per Day Hours Per Day Horsepower Load Factor Demolition Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40 Demolition Skid Steer Loaders Diesel Average 1.00 8.00 71.0 0.37 Demolition Graders Diesel Average 2.00 8.00 148 0.41
Site Preparation Rubber Tired Dozers Diesel Average 3.00 8.00 367 0.40 Site Preparation Concrete/Industrial
Sa
ws
Diesel Average 1.00 8.00 33.0 0.73
Site Preparation Tractors/Loaders/Back
hoes
Diesel Average 4.00 8.00 84.0 0.37
Reservoir Excavation Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40 Reservoir Excavation Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37 Reservoir Excavation Tractors/Loaders/Back
hoes
Diesel Average 3.00 8.00 84.0 0.37
Outlet Line Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40 Outlet Line Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37 Outlet Line Tractors/Loaders/Back
hoes
Diesel Average 3.00 8.00 84.0 0.37
Reservoir
Constr
uction
Cranes Diesel Average 1.00 8.00 367 0.29
Reservoir
Constr
uction
Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40
Reservoir
Constr
uction
Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37
Pipe/Diversion/Treatm
ent
F
acility/Pump/Bioswal
e
Cranes Diesel Average 1.00 8.00 367 0.29
Pipe/Diversion/Treatm
ent
F
acility/Pump/Bioswal
e
Trenchers Diesel Average 2.00 8.00 40.0 0.50
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0.3771.08.002.00AverageDieselSkid Steer LoadersPipe/Diversion/Treatm ent
Field/Bioswale/Landsc
aping
Graders Diesel Average 1.00 8.00 148 0.41
Field/Bioswale/Landsc
aping
Skid Steer Loaders Diesel Average 1.00 8.00 71.0 0.37
Field/Bioswale/Landsc
aping
Pavers Diesel Average 1.00 8.00 81.0 0.42
Field/Bioswale/Landsc
aping
Paving Equipment Diesel Average 1.00 8.00 89.0 0.36
Field/Bioswale/Landsc
aping
Rollers Diesel Average 1.00 8.00 36.0 0.38
Field/Bioswale/Landsc
aping
Off-Highway Tractors Diesel Average 1.00 8.00 38.0 0.44 Field/Bioswale/Landsc
aping
Off-Highway Tractors Diesel Average 1.00 8.00 38.0 0.44 Field/Bioswale/Landsc
aping
Forklifts Diesel Average 1.00 8.00 82.0 0.20
Field/Bioswale/Landsc
aping
Cement and Mortar
Mix
ers
Diesel Average 1.00 8.00 10.0 0.56
Field/Bioswale/Landsc
aping
Aerial Lifts Diesel Average 1.00 8.00 46.0 0.31

5.3. Construction Vehicles

5.3.1. Unmitigated
Phase Name Trip Type One-Way Trips per Day Miles per Trip Vehicle Mix Demolition — — — —
Demolition Worker 18.0 12.6 LDA,LDT1,LDT2
Demolition Vendor 4.00 7.75 HHDT,MHDT
Demolition Hauling 4.00 20.0 HHDT
Demolition Onsite truck — — HHDT
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Site Preparation — — — —
Site Preparation Worker 26.0 12.6 LDA,LDT1,LDT2
Site Preparation Vendor 4.00 7.75 HHDT,MHDT
Site Preparation Hauling 4.00 20.0 HHDT
Site Preparation Onsite truck — — HHDT
Reservoir Excavation — — — —
Reservoir Excavation Worker 24.0 12.6 LDA,LDT1,LDT2
Reservoir Excavation Vendor 4.00 7.75 HHDT,MHDT
Reservoir Excavation Hauling 8.00 20.0 HHDT
Reservoir Excavation Onsite truck — — HHDT
Reservoir Construction — — — —
Reservoir Construction Worker 14.0 12.6 LDA,LDT1,LDT2
Reservoir Construction Vendor 2.00 7.75 HHDT,MHDT
Reservoir Construction Hauling 0.00 20.0 HHDT
Reservoir Construction Onsite truck — — HHDT
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
— — — —
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Worker 18.0 12.6 LDA,LDT1,LDT2
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Vendor 2.00 7.75 HHDT,MHDT
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Hauling 4.00 20.0 HHDT
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Onsite truck — — HHDT
Field/Bioswale/Landscaping — — — —
Field/Bioswale/Landscaping Worker 26.0 12.6 LDA,LDT1,LDT2 Field/Bioswale/Landscaping Vendor 2.00 7.75 HHDT,MHDT
Field/Bioswale/Landscaping Hauling 0.00 20.0 HHDT
Field/Bioswale/Landscaping Onsite truck — — HHDT
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 39 / 50
Outlet Line — — — —
Outlet Line Worker 18.0 12.6 LDA,LDT1,LDT2
Outlet Line Vendor 4.00 7.75 HHDT,MHDT
Outlet Line Hauling 0.00 20.0 HHDT
Outlet Line Onsite truck — — HHDT

5.4. Vehicles

5.4.1. Construction Vehicle Control Strategies
Non-applicable. No control strategies activated by user.

5.5. Architectural Coatings
Phase Name Residential Interior Area
Coated
(sq ft)
Residential Exterior Area
Coated
(sq ft)
Non-Residential Interior Area
Coated
(sq ft)
Non-Residential Exterior Area
Coated
(sq ft)
Parking Area Coated (sq ft)

5.6. Dust Mitigation

5.6.1. Construction Earthmoving Activities
Phase Name Material Imported (cy) Material Exported (cy) Acres Graded (acres) Material Demolished (Ton of Debr
is)
Acres Paved (acres)
Demolition 0.00 0.00 0.00 141 —
Site Preparation — — 36.0 0.00 —
Reservoir Excavation — 3,980 100 0.00 —
Outlet Line — — 23.0 0.00 —

5.6.2. Construction Earthmoving Control Strategies
Control Strategies Applied Frequency (per day) PM10 Reduction PM2.5 Reduction Water Exposed Area 2 61% 61%
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 40 / 50

5.7. Construction Paving
Land Use Area Paved (acres) % Asphalt
City Park 0.00 0%
Other Asphalt Surfaces 0.07 100%
Other Non-Asphalt Surfaces 0.08 0%

5.8. Construction Electricity Consumption and Emissions Factors kWh per Y ear and Emission Factor (lb/MWh)
Y ear kWh per Y ear CO2 CH4 N2O
2026 0.00 532 0.03 < 0.005
2027 0.00 532 0.03 < 0.005

5.9. Operational Mobile Sources

5.9.1. Unmitigated
Land Use Type Trips/Weekday Trips/Saturday Trips/Sunday Trips/Y ear VMT/Weekday VMT/Saturday VMT/Sunday VMT/Y ear Total all Land Uses 4.00 4.00 4.00 1,460 66.0 66.0 66.0 24,090

5.10. Operational Area Sources

5.10.1. Hearths

5.10.1.1. Unmitigated

5.10.2. Architectural Coatings
Residential Interior Area Coated (sq
ft)
Residential Exterior Area Coated (sq
ft)
Non-Residential Interior Area Coated
(sq
ft)
Non-Residential Exterior Area
Coated
(sq ft)
Parking Area Coated (sq ft)
0 0.00 0.00 0.00 405
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 41 / 50

5.10.3. Landscape Equipment
Season Unit Value
Snow Days day/yr 0.00
Summer Days day/yr 250

5.11. Operational Energy Consumption

5.11.1. Unmitigated
Electricity (kWh/yr) and CO2 and CH4 and N2O and Natural Gas (kBTU/yr) Land Use Electricity (kWh/yr) CO2 CH4 N2O Natural Gas (kBTU/yr) City Park 0.00 346 0.0330 0.0040 0.00
Other Asphalt Surfaces 0.00 346 0.0330 0.0040 0.00
Other Non-Asphalt Surfaces 0.00 346 0.0330 0.0040 0.00

5.12. Operational Water and Wastewater Consumption

5.12.1. Unmitigated
Land Use Indoor Water (gal/year) Outdoor Water (gal/year) City Park 0.00 0.00
Other Asphalt Surfaces 0.00 0.00
Other Non-Asphalt Surfaces 0.00 0.00

5.13. Operational Waste Generation

5.13.1. Unmitigated
Land Use Waste (ton/year) Cogeneration (kWh/year)
City Park 0.00 —
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Other Asphalt Surfaces 0.00 —
Other Non-Asphalt Surfaces 0.00 —

5.14. Operational Refrigeration and Air Conditioning Equipment

5.14.1. Unmitigated
Land Use Type Equipment Type Refrigerant GWP Quantity (kg) Operations Leak Rate Service Leak Rate Times Serviced

5.15. Operational Off-Road Equipment

5.15.1. Unmitigated
Equipment Type Fuel Type Engine Tier Number per Day Hours Per Day Horsepower Load Factor Pumps Electric Average 1.00 24.0 15.3 0.74
Pumps Electric Average 1.00 8.00 11.0 0.74

5.16. Stationary Sources

5.16.1. Emergency Generators and Fire Pumps
Equipment Type Fuel Type Number per Day Hours per Day Hours per Y ear Horsepower Load Factor

5.16.2. Process Boilers
Equipment Type Fuel Type Number Boiler Rating (MMBtu/hr) Daily Heat Input (MMBtu/day) Annual Heat Input (MMBtu/yr)

5.17. User Defined
Equipment Type Fuel Type
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5.18. Vegetation

5.18.1. Land Use Change

5.18.1.1. Unmitigated
Vegetation Land Use Type Vegetation Soil Type Initial Acres Final Acres

5.18.1. Biomass Cover Type

5.18.1.1. Unmitigated
Biomass Cover Type Initial Acres Final Acres

5.18.2. Sequestration

5.18.2.1. Unmitigated
Tree Type Number Electricity Saved (kWh/year) Natural Gas Saved (btu/year)

6. Climate Risk Detailed Report

6.1. Climate Risk Summary
Cal-Adapt midcentury 2040–2059 average projections for four hazards are reported below for your project location. These are under Representation Concentration Pathway (RCP) 8.5 which assumes
GHG emissions will continue to rise strongly through 2050 and then plateau around 2100.

Climate Hazard Result for Project Location Unit
Temperature and Extreme Heat 5.08 annual days of extreme heat Extreme Precipitation 4.20 annual days with precipitation above 20 mm Sea Level Rise — meters of inundation depth
Wildfire 0.00 annual hectares burned
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Temperature and Extreme Heat data are for grid cell in which your project are located. The projection is based on the 98th historical percentile of daily maximum/minimum temperatures from observed historical data (32 climate model ensemble from Cal-Adapt, 2040–2059 average under RCP 8.5). Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

Extreme Precipitation data are for the grid cell in which your project are located. The threshold of 20 mm is equivalent to about ¾ an inch of rain, which would be light to moderate rainfall if receiv
ed over a full day or heavy rain if received over a period of 2 to 4 hours. Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

Sea Level Rise data are for the grid cell in which your project are located. The projections are from Radke et al. (2017), as reported in Cal-Adapt (Radke et al., 2017, CEC-500-2017-008), and consider
inundation location and depth for the San Francisco Bay, the Sacramento-San Joaquin River Delta and California coast resulting different increments of sea level rise coupled with extreme storm events. Users may select from four scenarios to view the range in potential inundation depth for the grid cell. The four scenarios are: No rise, 0.5 meter, 1.0 meter, 1.41 meters Wildfire data are for the grid cell in which your project are located. The projections are from UC Davis, as reported in Cal-Adapt (2040–2059 average under RCP 8.5), and consider historical data of
climate, vegetation, population density, and large (> 400 ha) fire history. Users may select from four model simulations to view the range in potential wildfire probabilities for the grid cell. The four simulations make different assumptions about expected rainfall and temperature are: Warmer/drier (HadGEM2-ES), Cooler/wetter (CNRM-CM5), Average conditions (CanESM2), Range of different rainfall and temperature possibilities (MIROC5). Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

6.2. Initial Climate Risk Scores
Climate Hazard Exposure Score Sensitivity Score Adaptive Capacity Score Vulnerability Score Temperature and Extreme Heat 1 0 0 N/A
Extreme Precipitation N/A N/A N/A N/A
Sea Level Rise 1 0 0 N/A
Wildfire 1 0 0 N/A
Flooding N/A N/A N/A N/A
Drought N/A N/A N/A N/A
Snowpack Reduction N/A N/A N/A N/A
Air Quality Degradation 0 0 0 N/A
The sensitivity score reflects the extent to which a project would be adversely affected by exposure to a climate hazard. Exposure is rated on a scale of 1 to 5, with a score of 5 representing the g
reatest exposure.

The adaptive capacity of a project refers to its ability to manage and reduce vulnerabilities from projected climate hazards. Adaptive capacity is rated on a scale of 1 to 5, with a score of 5 representing
the greatest ability to adapt.

The overall vulnerability scores are calculated based on the potential impacts and adaptive capacity assessments for each hazard. Scores do not include implementation of climate risk reduction measures
.

6.3. Adjusted Climate Risk Scores
Climate Hazard Exposure Score Sensitivity Score Adaptive Capacity Score Vulnerability Score Temperature and Extreme Heat 1 1 1 2
Extreme Precipitation N/A N/A N/A N/A
Sea Level Rise 1 1 1 2
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 45 / 50
Wildfire 1 1 1 2
Flooding N/A N/A N/A N/A
Drought N/A N/A N/A N/A
Snowpack Reduction N/A N/A N/A N/A
Air Quality Degradation 1 1 1 2
The sensitivity score reflects the extent to which a project would be adversely affected by exposure to a climate hazard. Exposure is rated on a scale of 1 to 5, with a score of 5 representing the g
reatest exposure.

The adaptive capacity of a project refers to its ability to manage and reduce vulnerabilities from projected climate hazards. Adaptive capacity is rated on a scale of 1 to 5, with a score of 5 representing
the greatest ability to adapt.

The overall vulnerability scores are calculated based on the potential impacts and adaptive capacity assessments for each hazard. Scores include implementation of climate risk reduction measures
.

6.4. Climate Risk Reduction Measures

7. Health and Equity Details

7.1. CalEnviroScreen 4.0 Scores
The maximum CalEnviroScreen score is 100. A high score (i.e., greater than 50) reflects a higher pollution burden compared to other census tracts in the state.

Indicator Result for Project Census Tract
Exposure Indicators —
AQ-Ozone 22.2
AQ-PM 80.6
AQ-DPM 86.0
Drinking Water 29.4
Lead Risk Housing 59.8
Pesticides 0.00
Toxic Releases 98.8
Traffic 95.4
Effect Indicators —
CleanUp Sites 89.2
Groundwater 94.0
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Haz Waste Facilities/Generators 67.0
Impaired Water Bodies 93.4
Solid Waste 54.8
Sensitive Population —
Asthma 76.6
Cardio-vascular 82.7
Low Birth Weights 74.9
Socioeconomic Factor Indicators —
Education 62.2
Housing 28.2
Linguistic 77.1
Poverty 49.7
Unemployment 43.1

7.2. Healthy Places Index Scores
The maximum Health Places Index score is 100. A high score (i.e., greater than 50) reflects healthier community conditions compared to other census tracts in the state.

Indicator Result for Project Census Tract
Economic —
Above Poverty 57.92377775
Employed 62.37649172
Median HI 55.88348518
Education —
Bachelor's or higher 53.18875914
High school enrollment 100
Preschool enrollment 48.45374054
Transportation —
Auto Access 31.27165405
Active commuting 35.41639933
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 47 / 50
Social —
2-parent households 72.60361863
Voting 9.29038881
Neighborhood —
Alcohol availability 51.72590787
Park access 27.21673297
Retail density 43.47491338
Supermarket access 40.56204286
Tree canopy 50.87899397
Housing —
Homeownership 92.2751187
Housing habitability 75.06736815
Low-inc homeowner severe housing cost burden 74.6439112 Low-inc renter severe housing cost burden 51.52059541
Uncrowded housing 28.33311947
Health Outcomes —
Insured adults 43.11561658
Arthritis 59.3
Asthma ER Admissions 30.5
High Blood Pressure 37.6
Cancer (excluding skin) 49.7
Asthma 94.4
Coronary Heart Disease 54.4
Chronic Obstructive Pulmonary Disease 74.0
Diagnosed Diabetes 25.3
Life Expectancy at Birth 63.6
Cognitively Disabled 50.3
Physically Disabled 14.3
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 48 / 50
Heart Attack ER Admissions 25.8
Mental Health Not Good 69.9
Chronic Kidney Disease 45.1
Obesity 76.5
Pedestrian Injuries 19.6
Physical Health Not Good 51.8
Stroke 51.7
Health Risk Behaviors —
Binge Drinking 89.1
Current Smoker 71.8
No Leisure Time for Physical Activity 41.3
Climate Change Exposures —
Wildfire Risk 0.0
SLR Inundation Area 0.0
Children 68.4
Elderly 14.5
English Speaking 25.4
Foreign-born 90.0
Outdoor Workers 75.3
Climate Change Adaptive Capacity —
Impervious Surface Cover 11.0
Traffic Density 92.2
Traffic Access 61.6
Other Indices —
Hardship 56.0
Other Decision Support —
2016 Voting 18.3
Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 49 / 50

7.3. Overall Health & Equity Scores
Metric Result for Project Census Tract
CalEnviroScreen 4.0 Score for Project Location (a) 92.0 Healthy Places Index Score for Project Location (b) 51.0 Project Located in a Designated Disadvantaged Community (Senate Bill 535) Y es Project Located in a Low-Income Community (Assembly Bill 1550) Y es Project Located in a Community Air Protection Program Community (Assembly Bill 617) Wilmington Long Beach Carson a: The maximum CalEnviroScreen score is 100. A high score (i.e., greater than 50) reflects a higher pollution burden compared to other census tracts in the state. b: The maximum Health Places Index score is 100. A high score (i.e., greater than 50) reflects healthier community conditions compared to other census tracts in the state.

7.4. Health & Equity Measures
No Health & Equity Measures selected.

7.5. Evaluation Scorecard
Health & Equity Evaluation Scorecard not completed.

7.6. Health & Equity Custom Measures
No Health & Equity Custom Measures created.

8. User Changes to Default Data
Screen Justification
Construction: Construction Phases Adjusted default construction phases and durations based on Project description.

Construction: Off-Road Equipment Revised default equipment assumptions based on Project Description Construction: Trips and VMT Conservatively rounded default trips up to nearest even number. Added vendor trips to account f
or water and delivery trucks.

Construction: Dust From Material Movement Excavation quantities provided by applicant.

Operations: Solid Waste No increase in solid waste compared to existing conditions.

Operations: Refrigerants No increase in refrigerants compared to existing conditions.

Operations: Water and Waste Water No increase in outdoor water use compared to existing conditions.

Calas Park Stormwater Capture Project Detailed Report, 6/19/2025 50 / 50
Operations: Off-Road Equipment Larger electric pump to pump treated stormwater into the proposed bioswale (HP from project design plans). Smaller booster pump to assist the existing irrigation system (default HP).

Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 1 / 34
Calas Park Stormwater Capture Project LST Detailed Report Table of Contents

1. Basic Project Information

1.1. Basic Project Information

1.2. Land Use Types

1.3. User-Selected Emission Reduction Measures by Emissions Sector

2. Emissions Summary

2.1. Construction Emissions Compared Against Thresholds

2.2. Construction Emissions by Y ear, Unmitigated

3. Construction Emissions Details

3.1. Demolition (2026) - Unmitigated

3.3. Site Preparation (2026) - Unmitigated

3.5. Reservoir Excavation (2027) - Unmitigated

3.7. Outlet Line (2027) - Unmitigated

3.9. Reservoir Construction (2027) - Unmitigated

3.11. Pipe/Diversion/Treatment Facility/Pump/Bioswale (2027) - Unmitigated

3.13. Field/Bioswale/Landscaping (2027) - Unmitigated
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 2 / 34

4. Operations Emissions Details

4.10. Soil Carbon Accumulation By Vegetation Type

4.10.1. Soil Carbon Accumulation By Vegetation Type - Unmitigated

4.10.2. Above and Belowground Carbon Accumulation by Land Use Type - Unmitigated

4.10.3. Avoided and Sequestered Emissions by Species - Unmitigated

5. Activity Data

5.1. Construction Schedule

5.2. Off-Road Equipment

5.2.1. Unmitigated

5.3. Construction Vehicles

5.3.1. Unmitigated

5.4. Vehicles

5.4.1. Construction Vehicle Control Strategies

5.5. Architectural Coatings

5.6. Dust Mitigation

5.6.1. Construction Earthmoving Activities

5.6.2. Construction Earthmoving Control Strategies

5.7. Construction Paving
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 3 / 34

5.8. Construction Electricity Consumption and Emissions Factors

5.18. Vegetation

5.18.1. Land Use Change

5.18.1.1. Unmitigated

5.18.1. Biomass Cover Type

5.18.1.1. Unmitigated

5.18.2. Sequestration

5.18.2.1. Unmitigated

6. Climate Risk Detailed Report

6.1. Climate Risk Summary

6.2. Initial Climate Risk Scores

6.3. Adjusted Climate Risk Scores

6.4. Climate Risk Reduction Measures

7. Health and Equity Details

7.1. CalEnviroScreen 4.0 Scores

7.2. Healthy Places Index Scores

7.3. Overall Health & Equity Scores

7.4. Health & Equity Measures
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 4 / 34

7.5. Evaluation Scorecard

7.6. Health & Equity Custom Measures

8. User Changes to Default Data
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 5 / 34

1. Basic Project Information

1.1. Basic Project Information
Data Field Value
Project Name Calas Park Stormwater Capture Project LST
Construction Start Date 10/1/2026
Lead Agency —
Land Use Scale Project/site
Analysis Level for Defaults County
Windspeed (m/s) 3.50
Precipitation (days) 17.4
Location 33.827447691220186, -118.2571402051142
County Los Angeles-South Coast
City Carson
Air District South Coast AQMD
Air Basin South Coast
TAZ 4617
EDFZ 7
Electric Utility Southern California Edison
Gas Utility Southern California Gas
App Version 2022.1.1.29

1.2. Land Use Types
Land Use Subtype Size Unit Lot Acreage Building Area (sq ft) Landscape Area (sq ft)
Special Landscape
Area
(sq ft)
Population Description
City Park 5.72 Acre 5.72 0.00 6,620 6,620 — Park fields Other Asphalt
Surf
aces

3.26 1000sqft 0.07 0.00 0.00 — — Pavement
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 6 / 34
Other Non-Asphalt
Surf
aces

3.49 1000sqft 0.08 0.00 0.00 — — Concrete sidewalks

1.3. User-Selected Emission Reduction Measures by Emissions Sector No measures selected

2. Emissions Summary

2.1. Construction Emissions Compared Against Thresholds Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Un/Mit. TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 5.42 4.56 41.7 46.9 0.08 1.71 5.12 6.84 1.58 2.63 4.21 — 8,399 8,399 0.35 0.08 0.06 8,431 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 7.15 6.01 53.8 54.1 0.09 2.34 7.73 10.1 2.15 3.95 6.10 — 9,730 9,730 0.41 0.09 < 0.005 9,767 Average
Daily
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 1.65 1.39 12.5 14.3 0.02 0.50 1.40 1.91 0.46 0.72 1.18 — 2,615 2,615 0.11 0.02 0.01 2,625 Annual
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 0.30 0.25 2.28 2.61 < 0.005 0.09 0.26 0.35 0.08 0.13 0.22 — 433 433 0.02 < 0.005 < 0.005 435

2.2. Construction Emissions by Y ear, Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Y ear TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 7 / 34
——————————————————Daily -
Summer
(Max)
2027 5.42 4.56 41.7 46.9 0.08 1.71 5.12 6.84 1.58 2.63 4.21 — 8,399 8,399 0.35 0.08 0.06 8,431 Daily -
Winter
(Max)
— — — — — — — — — — — — — — — — — —
2026 7.15 6.01 53.8 54.1 0.09 2.34 7.73 10.1 2.15 3.95 6.10 — 9,730 9,730 0.41 0.09 < 0.005 9,767 2027 5.41 4.56 41.7 42.8 0.08 1.71 5.12 6.84 1.58 2.63 4.21 — 8,400 8,400 0.35 0.08 < 0.005 8,431 Average
Daily
— — — — — — — — — — — — — — — — — —
2026 0.73 0.62 5.50 5.52 0.01 0.24 0.51 0.76 0.22 0.26 0.48 — 993 993 0.04 0.01 < 0.005 997 2027 1.65 1.39 12.5 14.3 0.02 0.50 1.40 1.91 0.46 0.72 1.18 — 2,615 2,615 0.11 0.02 0.01 2,625 Annual — — — — — — — — — — — — — — — — — —
2026 0.13 0.11 1.00 1.01 < 0.005 0.04 0.09 0.14 0.04 0.05 0.09 — 164 164 0.01 < 0.005 < 0.005 165 2027 0.30 0.25 2.28 2.61 < 0.005 0.09 0.26 0.35 0.08 0.13 0.22 — 433 433 0.02 < 0.005 < 0.005 435

3. Construction Emissions Details

3.1. Demolition (2026) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 8 / 34
4,153—0.030.174,1394,139—0.98—0.981.06—1.060.0422.922.92.563.05Off-Roa d
Equipm
ent
Demoliti
on
— — — — — — 0.06 0.06 — 0.01 0.01 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.46 0.39 3.46 3.45 0.01 0.16 — 0.16 0.15 — 0.15 — 624 624 0.03 0.01 — 626 Demoliti
on
— — — — — — 0.01 0.01 — < 0.005 < 0.005 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.08 0.07 0.63 0.63 < 0.005 0.03 — 0.03 0.03 — 0.03 — 103 103 < 0.005 < 0.005 — 104 Demoliti
on
— — — — — — < 0.005 < 0.005 — < 0.005 < 0.005 — — — — — — — Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.05 0.05 0.01 0.17 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 6.18 6.18 < 0.005 < 0.005 < 0.005 6.65 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.19 7.19 < 0.005 < 0.005 < 0.005 7.57 Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 9 / 34
Hauling 0.01 < 0.005 0.06 0.04 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 10.1 10.1 < 0.005 < 0.005 < 0.005 10.7 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.01 0.01 < 0.005 0.02 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.94 0.94 < 0.005 < 0.005 < 0.005 1.01 Vendor < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.08 1.08 < 0.005 < 0.005 < 0.005 1.14 Hauling < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.52 1.52 < 0.005 < 0.005 < 0.005 1.60 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 < 0.005 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.16 0.16 < 0.005 < 0.005 < 0.005 0.17 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.18 0.18 < 0.005 < 0.005 < 0.005 0.19 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.25 0.25 < 0.005 < 0.005 < 0.005 0.27

3.3. Site Preparation (2026) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

3.95 3.32 30.7 30.6 0.05 1.28 — 1.28 1.18 — 1.18 — 5,542 5,542 0.22 0.04 — 5,561 Dust
F
rom
Material
Movement
— — — — — — 7.67 7.67 — 3.94 3.94 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 10 / 34
Off-Roa
Equipment

0.26 0.22 2.02 2.01 < 0.005 0.08 — 0.08 0.08 — 0.08 — 364 364 0.01 < 0.005 — 366 Dust
F
rom
Material
Movement
— — — — — — 0.50 0.50 — 0.26 0.26 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.05 0.04 0.37 0.37 < 0.005 0.02 — 0.02 0.01 — 0.01 — 60.3 60.3 < 0.005 < 0.005 — 60.5 Dust
F
rom
Material
Movement
— — — — — — 0.09 0.09 — 0.05 0.05 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.08 0.07 0.02 0.24 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 8.93 8.93 < 0.005 < 0.005 < 0.005 9.60 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.19 7.19 < 0.005 < 0.005 < 0.005 7.57 Hauling 0.01 < 0.005 0.06 0.04 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 10.1 10.1 < 0.005 < 0.005 < 0.005 10.7 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.01 < 0.005 < 0.005 0.02 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.59 0.59 < 0.005 < 0.005 < 0.005 0.64 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.47 0.47 < 0.005 < 0.005 < 0.005 0.50 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.66 0.66 < 0.005 < 0.005 < 0.005 0.70 Annual — — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 11 / 34
Worker < 0.005 < 0.005 < 0.005 < 0.005 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.10 0.10 < 0.005 < 0.005 < 0.005 0.11 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.08 0.08 < 0.005 < 0.005 < 0.005 0.08 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.11 0.11 < 0.005 < 0.005 < 0.005 0.12

3.5. Reservoir Excavation (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.60 2.19 20.6 22.5 0.04 0.83 — 0.83 0.77 — 0.77 — 4,119 4,119 0.17 0.03 — 4,133 Dust
F
rom
Material
Movement
— — — — — — 5.11 5.11 — 2.63 2.63 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.60 2.19 20.6 22.5 0.04 0.83 — 0.83 0.77 — 0.77 — 4,119 4,119 0.17 0.03 — 4,133 Dust
F
rom
Material
Movement
— — — — — — 5.11 5.11 — 2.63 2.63 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 12 / 34
——————————————————Average
Daily
Off-Roa
d
Equipm
ent

0.55 0.46 4.35 4.75 0.01 0.18 — 0.18 0.16 — 0.16 — 869 869 0.04 0.01 — 872 Dust
F
rom
Material
Movement
— — — — — — 1.08 1.08 — 0.55 0.55 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.10 0.08 0.79 0.87 < 0.005 0.03 — 0.03 0.03 — 0.03 — 144 144 0.01 < 0.005 — 144 Dust
F
rom
Material
Movement
— — — — — — 0.20 0.20 — 0.10 0.10 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.07 0.07 0.02 0.18 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 8.23 8.23 < 0.005 < 0.005 0.01 8.86 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.02 7.02 < 0.005 < 0.005 0.01 7.40 Hauling 0.01 0.01 0.12 0.09 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 19.7 19.7 0.01 < 0.005 0.01 20.8 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.07 0.06 0.02 0.21 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 8.07 8.07 < 0.005 < 0.005 < 0.005 8.69 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.09 7.09 < 0.005 < 0.005 < 0.005 7.46 Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 13 / 34
Hauling 0.01 < 0.005 0.12 0.09 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 19.9 19.9 0.01 < 0.005 < 0.005 21.1 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.01 0.01 < 0.005 0.04 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 1.71 1.71 < 0.005 < 0.005 < 0.005 1.84 Vendor < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.49 1.49 < 0.005 < 0.005 < 0.005 1.57 Hauling < 0.005 < 0.005 0.03 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 4.18 4.18 < 0.005 < 0.005 < 0.005 4.41 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.01 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.28 0.28 < 0.005 < 0.005 < 0.005 0.31 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.25 0.25 < 0.005 < 0.005 < 0.005 0.26 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.69 0.69 < 0.005 < 0.005 < 0.005 0.73

3.7. Outlet Line (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.60 2.19 20.6 22.5 0.04 0.83 — 0.83 0.77 — 0.77 — 4,119 4,119 0.17 0.03 — 4,133 Dust
F
rom
Material
Movement
— — — — — — 5.11 5.11 — 2.63 2.63 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 14 / 34
Off-Roa
Equipment

0.16 0.14 1.30 1.42 < 0.005 0.05 — 0.05 0.05 — 0.05 — 260 260 0.01 < 0.005 — 260 Dust
F
rom
Material
Movement
— — — — — — 0.32 0.32 — 0.17 0.17 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.03 0.03 0.24 0.26 < 0.005 0.01 — 0.01 0.01 — 0.01 — 43.0 43.0 < 0.005 < 0.005 — 43.1 Dust
F
rom
Material
Movement
— — — — — — 0.06 0.06 — 0.03 0.03 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.05 0.05 0.01 0.13 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 6.18 6.18 < 0.005 < 0.005 0.01 6.64 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.02 7.02 < 0.005 < 0.005 0.01 7.40 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.01 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.38 0.38 < 0.005 < 0.005 < 0.005 0.41 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.44 0.44 < 0.005 < 0.005 < 0.005 0.47 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 15 / 34
Worker < 0.005 < 0.005 < 0.005 < 0.005 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.06 0.06 < 0.005 < 0.005 < 0.005 0.07 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.07 0.07 < 0.005 < 0.005 < 0.005 0.08 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

3.9. Reservoir Construction (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.69 2.26 20.9 19.8 0.04 0.88 — 0.88 0.81 — 0.81 — 4,238 4,238 0.17 0.03 — 4,252 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.69 2.26 20.9 19.8 0.04 0.88 — 0.88 0.81 — 0.81 — 4,238 4,238 0.17 0.03 — 4,252 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.41 0.34 3.15 2.99 0.01 0.13 — 0.13 0.12 — 0.12 — 639 639 0.03 0.01 — 641 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 16 / 34
Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.07 0.06 0.58 0.54 < 0.005 0.02 — 0.02 0.02 — 0.02 — 106 106 < 0.005 < 0.005 — 106 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.04 0.04 0.01 0.10 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 4.80 4.80 < 0.005 < 0.005 0.01 5.17 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.51 3.51 < 0.005 < 0.005 < 0.005 3.70 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.04 0.04 0.01 0.12 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 4.71 4.71 < 0.005 < 0.005 < 0.005 5.07 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.54 3.54 < 0.005 < 0.005 < 0.005 3.73 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.01 0.01 < 0.005 0.02 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.71 0.71 < 0.005 < 0.005 < 0.005 0.77 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.53 0.53 < 0.005 < 0.005 < 0.005 0.56 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 < 0.005 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.12 0.12 < 0.005 < 0.005 < 0.005 0.13 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.09 0.09 < 0.005 < 0.005 < 0.005 0.09 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

3.11. Pipe/Diversion/Treatment Facility/Pump/Bioswale (2027) - Unmitigated Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 17 / 34
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.97 0.82 7.34 8.88 0.02 0.26 — 0.26 0.24 — 0.24 — 1,895 1,895 0.08 0.02 — 1,901 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.15 0.12 1.11 1.34 < 0.005 0.04 — 0.04 0.04 — 0.04 — 286 286 0.01 < 0.005 — 287 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.03 0.02 0.20 0.24 < 0.005 0.01 — 0.01 0.01 — 0.01 — 47.3 47.3 < 0.005 < 0.005 — 47.4 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.05 0.05 0.01 0.13 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 6.18 6.18 < 0.005 < 0.005 0.01 6.64 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.51 3.51 < 0.005 < 0.005 < 0.005 3.70 Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 18 / 34
Hauling 0.01 < 0.005 0.06 0.04 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 9.85 9.85 < 0.005 < 0.005 0.01 10.4 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.01 0.01 < 0.005 0.02 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.92 0.92 < 0.005 < 0.005 < 0.005 0.99 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.53 0.53 < 0.005 < 0.005 < 0.005 0.56 Hauling < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.49 1.49 < 0.005 < 0.005 < 0.005 1.57 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 < 0.005 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.15 0.15 < 0.005 < 0.005 < 0.005 0.16 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.09 0.09 < 0.005 < 0.005 < 0.005 0.09 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.25 0.25 < 0.005 < 0.005 < 0.005 0.26

3.13. Field/Bioswale/Landscaping (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

1.39 1.17 10.6 14.9 0.02 0.42 — 0.42 0.38 — 0.38 — 2,271 2,271 0.09 0.02 — 2,279 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 19 / 34
2,279—0.020.092,2712,271—0.38—0.380.42—0.420.0214.910.61.171.39Off-Roa d
Equipm
ent
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.34 0.28 2.55 3.60 0.01 0.10 — 0.10 0.09 — 0.09 — 548 548 0.02 < 0.005 — 549 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.06 0.05 0.47 0.66 < 0.005 0.02 — 0.02 0.02 — 0.02 — 90.7 90.7 < 0.005 < 0.005 — 91.0 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.07 0.07 0.02 0.19 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 8.92 8.92 < 0.005 < 0.005 0.01 9.59 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.51 3.51 < 0.005 < 0.005 < 0.005 3.70 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.07 0.07 0.02 0.22 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 8.75 8.75 < 0.005 < 0.005 < 0.005 9.42 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.54 3.54 < 0.005 < 0.005 < 0.005 3.73 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 20 / 34
——————————————————Average
Daily
Worker 0.02 0.02 < 0.005 0.05 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 2.12 2.12 < 0.005 < 0.005 < 0.005 2.28 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.85 0.85 < 0.005 < 0.005 < 0.005 0.89 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.01 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.35 0.35 < 0.005 < 0.005 < 0.005 0.38 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.14 0.14 < 0.005 < 0.005 < 0.005 0.15 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

4. Operations Emissions Details

4.10. Soil Carbon Accumulation By Vegetation Type

4.10.1. Soil Carbon Accumulation By Vegetation Type - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Vegetati
on
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

4.10.2. Above and Belowground Carbon Accumulation by Land Use Type - Unmitigated Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 21 / 34
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land
Use
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

4.10.3. Avoided and Sequestered Emissions by Species - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Species TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 22 / 34
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —

5. Activity Data

5.1. Construction Schedule
Phase Name Phase Type Start Date End Date Days Per Week Work Days per Phase Phase Description Demolition Demolition 10/1/2026 12/16/2026 5.00 55.0 —
Site Preparation Site Preparation 11/30/2026 12/31/2026 5.00 24.0 — Reservoir Excavation Grading 1/1/2027 4/19/2027 5.00 77.0 — Outlet Line Grading 8/1/2027 9/1/2027 5.00 23.0 —
Reservoir Construction Building Construction 3/16/2027 5/31/2027 5.00 55.0 — Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 23 / 34
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Building Construction 6/1/2027 8/16/2027 5.00 55.0 —
Field/Bioswale/Landscapi
ng
Building Construction 7/31/2027 12/1/2027 5.00 88.0 —

5.2. Off-Road Equipment

5.2.1. Unmitigated
Phase Name Equipment Type Fuel Type Engine Tier Number per Day Hours Per Day Horsepower Load Factor Demolition Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40 Demolition Skid Steer Loaders Diesel Average 1.00 8.00 71.0 0.37 Demolition Graders Diesel Average 2.00 8.00 148 0.41
Site Preparation Rubber Tired Dozers Diesel Average 3.00 8.00 367 0.40 Site Preparation Concrete/Industrial
Sa
ws
Diesel Average 1.00 8.00 33.0 0.73
Site Preparation Tractors/Loaders/Back
hoes
Diesel Average 4.00 8.00 84.0 0.37
Reservoir Excavation Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40 Reservoir Excavation Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37 Reservoir Excavation Tractors/Loaders/Back
hoes
Diesel Average 3.00 8.00 84.0 0.37
Outlet Line Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40 Outlet Line Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37 Outlet Line Tractors/Loaders/Back
hoes
Diesel Average 3.00 8.00 84.0 0.37
Reservoir
Constr
uction
Cranes Diesel Average 1.00 8.00 367 0.29
Reservoir
Constr
uction
Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40
Reservoir
Constr
uction
Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 24 / 34

0.293678.001.00AverageDieselCranesPipe/Diversion/Treatm ent
Pipe/Diversion/Treatm
ent
F
acility/Pump/Bioswal
e
Trenchers Diesel Average 2.00 8.00 40.0 0.50
Pipe/Diversion/Treatm
ent
F
acility/Pump/Bioswal
e
Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37
Field/Bioswale/Landsc
aping
Graders Diesel Average 1.00 8.00 148 0.41
Field/Bioswale/Landsc
aping
Skid Steer Loaders Diesel Average 1.00 8.00 71.0 0.37
Field/Bioswale/Landsc
aping
Pavers Diesel Average 1.00 8.00 81.0 0.42
Field/Bioswale/Landsc
aping
Paving Equipment Diesel Average 1.00 8.00 89.0 0.36
Field/Bioswale/Landsc
aping
Rollers Diesel Average 1.00 8.00 36.0 0.38
Field/Bioswale/Landsc
aping
Off-Highway Tractors Diesel Average 1.00 8.00 38.0 0.44 Field/Bioswale/Landsc
aping
Off-Highway Tractors Diesel Average 1.00 8.00 38.0 0.44 Field/Bioswale/Landsc
aping
Forklifts Diesel Average 1.00 8.00 82.0 0.20
Field/Bioswale/Landsc
aping
Cement and Mortar
Mix
ers
Diesel Average 1.00 8.00 10.0 0.56
Field/Bioswale/Landsc
aping
Aerial Lifts Diesel Average 1.00 8.00 46.0 0.31

5.3. Construction Vehicles

5.3.1. Unmitigated
Phase Name Trip Type One-Way Trips per Day Miles per Trip Vehicle Mix Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 25 / 34
Demolition — — — —
Demolition Worker 18.0 0.25 LDA,LDT1,LDT2
Demolition Vendor 4.00 0.25 HHDT,MHDT
Demolition Hauling 4.00 0.25 HHDT
Demolition Onsite truck — — HHDT
Site Preparation — — — —
Site Preparation Worker 26.0 0.25 LDA,LDT1,LDT2
Site Preparation Vendor 4.00 0.25 HHDT,MHDT
Site Preparation Hauling 4.00 0.25 HHDT
Site Preparation Onsite truck — — HHDT
Reservoir Excavation — — — —
Reservoir Excavation Worker 24.0 0.25 LDA,LDT1,LDT2
Reservoir Excavation Vendor 4.00 0.25 HHDT,MHDT
Reservoir Excavation Hauling 8.00 0.25 HHDT
Reservoir Excavation Onsite truck — — HHDT
Reservoir Construction — — — —
Reservoir Construction Worker 14.0 0.25 LDA,LDT1,LDT2
Reservoir Construction Vendor 2.00 0.25 HHDT,MHDT
Reservoir Construction Hauling 0.00 0.25 HHDT
Reservoir Construction Onsite truck — — HHDT
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
— — — —
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Worker 18.0 0.25 LDA,LDT1,LDT2
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Vendor 2.00 0.25 HHDT,MHDT
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Hauling 4.00 0.25 HHDT
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Onsite truck — — HHDT
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 26 / 34
Field/Bioswale/Landscaping — — — —
Field/Bioswale/Landscaping Worker 26.0 0.25 LDA,LDT1,LDT2 Field/Bioswale/Landscaping Vendor 2.00 0.25 HHDT,MHDT
Field/Bioswale/Landscaping Hauling 0.00 0.25 HHDT
Field/Bioswale/Landscaping Onsite truck — — HHDT
Outlet Line — — — —
Outlet Line Worker 18.0 0.25 LDA,LDT1,LDT2
Outlet Line Vendor 4.00 0.25 HHDT,MHDT
Outlet Line Hauling 0.00 0.25 HHDT
Outlet Line Onsite truck — — HHDT

5.4. Vehicles

5.4.1. Construction Vehicle Control Strategies
Non-applicable. No control strategies activated by user.

5.5. Architectural Coatings
Phase Name Residential Interior Area
Coated
(sq ft)
Residential Exterior Area
Coated
(sq ft)
Non-Residential Interior Area
Coated
(sq ft)
Non-Residential Exterior Area
Coated
(sq ft)
Parking Area Coated (sq ft)

5.6. Dust Mitigation

5.6.1. Construction Earthmoving Activities
Phase Name Material Imported (cy) Material Exported (cy) Acres Graded (acres) Material Demolished (Ton of Debr
is)
Acres Paved (acres)
Demolition 0.00 0.00 0.00 141 —
Site Preparation — — 36.0 0.00 —
Reservoir Excavation — 3,980 100 0.00 —
Outlet Line — — 23.0 0.00 —
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 27 / 34

5.6.2. Construction Earthmoving Control Strategies
Control Strategies Applied Frequency (per day) PM10 Reduction PM2.5 Reduction Water Exposed Area 2 61% 61%

5.7. Construction Paving
Land Use Area Paved (acres) % Asphalt
City Park 0.00 0%
Other Asphalt Surfaces 0.07 100%
Other Non-Asphalt Surfaces 0.08 0%

5.8. Construction Electricity Consumption and Emissions Factors kWh per Y ear and Emission Factor (lb/MWh)
Y ear kWh per Y ear CO2 CH4 N2O
2026 0.00 532 0.03 < 0.005
2027 0.00 532 0.03 < 0.005

5.18. Vegetation

5.18.1. Land Use Change

5.18.1.1. Unmitigated
Vegetation Land Use Type Vegetation Soil Type Initial Acres Final Acres

5.18.1. Biomass Cover Type

5.18.1.1. Unmitigated
Biomass Cover Type Initial Acres Final Acres
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 28 / 34

5.18.2. Sequestration

5.18.2.1. Unmitigated
Tree Type Number Electricity Saved (kWh/year) Natural Gas Saved (btu/year)

6. Climate Risk Detailed Report

6.1. Climate Risk Summary
Cal-Adapt midcentury 2040–2059 average projections for four hazards are reported below for your project location. These are under Representation Concentration Pathway (RCP) 8.5 which assumes
GHG emissions will continue to rise strongly through 2050 and then plateau around 2100.

Climate Hazard Result for Project Location Unit
Temperature and Extreme Heat 5.08 annual days of extreme heat Extreme Precipitation 4.20 annual days with precipitation above 20 mm Sea Level Rise — meters of inundation depth
Wildfire 0.00 annual hectares burned
Temperature and Extreme Heat data are for grid cell in which your project are located. The projection is based on the 98th historical percentile of daily maximum/minimum temperatures from obser
ved historical data (32 climate model ensemble from Cal-Adapt, 2040–2059 average under RCP 8.5). Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

Extreme Precipitation data are for the grid cell in which your project are located. The threshold of 20 mm is equivalent to about ¾ an inch of rain, which would be light to moderate rainfall if receiv
ed over a full day or heavy rain if received over a period of 2 to 4 hours. Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

Sea Level Rise data are for the grid cell in which your project are located. The projections are from Radke et al. (2017), as reported in Cal-Adapt (Radke et al., 2017, CEC-500-2017-008), and consider
inundation location and depth for the San Francisco Bay, the Sacramento-San Joaquin River Delta and California coast resulting different increments of sea level rise coupled with extreme storm events. Users may select from four scenarios to view the range in potential inundation depth for the grid cell. The four scenarios are: No rise, 0.5 meter, 1.0 meter, 1.41 meters Wildfire data are for the grid cell in which your project are located. The projections are from UC Davis, as reported in Cal-Adapt (2040–2059 average under RCP 8.5), and consider historical data of
climate, vegetation, population density, and large (> 400 ha) fire history. Users may select from four model simulations to view the range in potential wildfire probabilities for the grid cell. The four simulations make different assumptions about expected rainfall and temperature are: Warmer/drier (HadGEM2-ES), Cooler/wetter (CNRM-CM5), Average conditions (CanESM2), Range of different rainfall and temperature possibilities (MIROC5). Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

6.2. Initial Climate Risk Scores
Climate Hazard Exposure Score Sensitivity Score Adaptive Capacity Score Vulnerability Score Temperature and Extreme Heat 1 0 0 N/A
Extreme Precipitation N/A N/A N/A N/A
Sea Level Rise 1 0 0 N/A
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 29 / 34
Wildfire 1 0 0 N/A
Flooding N/A N/A N/A N/A
Drought N/A N/A N/A N/A
Snowpack Reduction N/A N/A N/A N/A
Air Quality Degradation 0 0 0 N/A
The sensitivity score reflects the extent to which a project would be adversely affected by exposure to a climate hazard. Exposure is rated on a scale of 1 to 5, with a score of 5 representing the g
reatest exposure.

The adaptive capacity of a project refers to its ability to manage and reduce vulnerabilities from projected climate hazards. Adaptive capacity is rated on a scale of 1 to 5, with a score of 5 representing
the greatest ability to adapt.

The overall vulnerability scores are calculated based on the potential impacts and adaptive capacity assessments for each hazard. Scores do not include implementation of climate risk reduction measures
.

6.3. Adjusted Climate Risk Scores
Climate Hazard Exposure Score Sensitivity Score Adaptive Capacity Score Vulnerability Score Temperature and Extreme Heat 1 1 1 2
Extreme Precipitation N/A N/A N/A N/A
Sea Level Rise 1 1 1 2
Wildfire 1 1 1 2
Flooding N/A N/A N/A N/A
Drought N/A N/A N/A N/A
Snowpack Reduction N/A N/A N/A N/A
Air Quality Degradation 1 1 1 2
The sensitivity score reflects the extent to which a project would be adversely affected by exposure to a climate hazard. Exposure is rated on a scale of 1 to 5, with a score of 5 representing the g
reatest exposure.

The adaptive capacity of a project refers to its ability to manage and reduce vulnerabilities from projected climate hazards. Adaptive capacity is rated on a scale of 1 to 5, with a score of 5 representing
the greatest ability to adapt.

The overall vulnerability scores are calculated based on the potential impacts and adaptive capacity assessments for each hazard. Scores include implementation of climate risk reduction measures
.

6.4. Climate Risk Reduction Measures

7. Health and Equity Details
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 30 / 34

7.1. CalEnviroScreen 4.0 Scores
The maximum CalEnviroScreen score is 100. A high score (i.e., greater than 50) reflects a higher pollution burden compared to other census tracts in the state.

Indicator Result for Project Census Tract
Exposure Indicators —
AQ-Ozone 22.2
AQ-PM 80.6
AQ-DPM 86.0
Drinking Water 29.4
Lead Risk Housing 59.8
Pesticides 0.00
Toxic Releases 98.8
Traffic 95.4
Effect Indicators —
CleanUp Sites 89.2
Groundwater 94.0
Haz Waste Facilities/Generators 67.0
Impaired Water Bodies 93.4
Solid Waste 54.8
Sensitive Population —
Asthma 76.6
Cardio-vascular 82.7
Low Birth Weights 74.9
Socioeconomic Factor Indicators —
Education 62.2
Housing 28.2
Linguistic 77.1
Poverty 49.7
Unemployment 43.1
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 31 / 34

7.2. Healthy Places Index Scores
The maximum Health Places Index score is 100. A high score (i.e., greater than 50) reflects healthier community conditions compared to other census tracts in the state.

Indicator Result for Project Census Tract
Economic —
Above Poverty 57.92377775
Employed 62.37649172
Median HI 55.88348518
Education —
Bachelor's or higher 53.18875914
High school enrollment 100
Preschool enrollment 48.45374054
Transportation —
Auto Access 31.27165405
Active commuting 35.41639933
Social —
2-parent households 72.60361863
Voting 9.29038881
Neighborhood —
Alcohol availability 51.72590787
Park access 27.21673297
Retail density 43.47491338
Supermarket access 40.56204286
Tree canopy 50.87899397
Housing —
Homeownership 92.2751187
Housing habitability 75.06736815
Low-inc homeowner severe housing cost burden 74.6439112 Low-inc renter severe housing cost burden 51.52059541
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 32 / 34
Uncrowded housing 28.33311947
Health Outcomes —
Insured adults 43.11561658
Arthritis 59.3
Asthma ER Admissions 30.5
High Blood Pressure 37.6
Cancer (excluding skin) 49.7
Asthma 94.4
Coronary Heart Disease 54.4
Chronic Obstructive Pulmonary Disease 74.0
Diagnosed Diabetes 25.3
Life Expectancy at Birth 63.6
Cognitively Disabled 50.3
Physically Disabled 14.3
Heart Attack ER Admissions 25.8
Mental Health Not Good 69.9
Chronic Kidney Disease 45.1
Obesity 76.5
Pedestrian Injuries 19.6
Physical Health Not Good 51.8
Stroke 51.7
Health Risk Behaviors —
Binge Drinking 89.1
Current Smoker 71.8
No Leisure Time for Physical Activity 41.3
Climate Change Exposures —
Wildfire Risk 0.0
SLR Inundation Area 0.0
Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 33 / 34
Children 68.4
Elderly 14.5
English Speaking 25.4
Foreign-born 90.0
Outdoor Workers 75.3
Climate Change Adaptive Capacity —
Impervious Surface Cover 11.0
Traffic Density 92.2
Traffic Access 61.6
Other Indices —
Hardship 56.0
Other Decision Support —
2016 Voting 18.3

7.3. Overall Health & Equity Scores
Metric Result for Project Census Tract
CalEnviroScreen 4.0 Score for Project Location (a) 92.0 Healthy Places Index Score for Project Location (b) 51.0 Project Located in a Designated Disadvantaged Community (Senate Bill 535) Y es Project Located in a Low-Income Community (Assembly Bill 1550) Y es Project Located in a Community Air Protection Program Community (Assembly Bill 617) Wilmington Long Beach Carson a: The maximum CalEnviroScreen score is 100. A high score (i.e., greater than 50) reflects a higher pollution burden compared to other census tracts in the state. b: The maximum Health Places Index score is 100. A high score (i.e., greater than 50) reflects healthier community conditions compared to other census tracts in the state.

7.4. Health & Equity Measures
No Health & Equity Measures selected.

7.5. Evaluation Scorecard
Health & Equity Evaluation Scorecard not completed.

Calas Park Stormwater Capture Project LST Detailed Report, 6/19/2025 34 / 34

7.6. Health & Equity Custom Measures
No Health & Equity Custom Measures created.

8. User Changes to Default Data
Screen Justification
Construction: Construction Phases Adjusted default construction phases and durations based on Project description.

Construction: Off-Road Equipment Revised default equipment assumptions based on Project Description Construction: Trips and VMT Conservatively rounded default trips up to nearest even number. Added vendor trips to account f
or water and delivery trucks. 0.25 miles for on-site travel.

Construction: Dust From Material Movement Excavation quantities provided by applicant.

Operations: Solid Waste No increase in solid waste compared to existing conditions.

Operations: Refrigerants No increase in refrigerants compared to existing conditions.

Operations: Water and Waste Water No increase in outdoor water use compared to existing conditions.

Operations: Off-Road Equipment Larger electric pump to pump treated stormwater into the proposed bioswale (HP from project design
plans). Smaller booster pump to assist the existing irrigation system (default HP).

Appendix B
Construction Health Risk Assessment Modeling

Table of Contents
Calas Park Stormwater Capture Project Construction HRA Detailed Report 2 Carson Calas Park Stormwater Capture.ADO 57
Residential_UnmitigatedOutput 257
Unmitigated_Residential_CancerRisk 260
Unmitigated_Residential_ChronicRisk 285
School_UnmitigatedOutput 308
Unmitigated_School_CancerRisk 311
Unmitigated_School_ChronicRisk 312
Residential_MitigatedOutput 313
Mitigated_Residential_CancerRisk 316
Mitigated_Residential_ChronicRisk 341
School_MitigatedOutput 364
Mitigated_School_CancerRisk 367
Mitigated_School_ChronicRisk 368
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 1 / 55
Calas Park Stormwater Capture Project Construction HRA Detailed Report
Table of Contents

1. Basic Project Information

1.1. Basic Project Information

1.2. Land Use Types

1.3. User-Selected Emission Reduction Measures by Emissions Sector

2. Emissions Summary

2.1. Construction Emissions Compared Against Thresholds

2.2. Construction Emissions by Y ear, Unmitigated

2.3. Construction Emissions by Y ear, Mitigated

3. Construction Emissions Details

3.1. Demolition (2026) - Unmitigated

3.2. Demolition (2026) - Mitigated

3.3. Site Preparation (2026) - Unmitigated

3.4. Site Preparation (2026) - Mitigated

3.5. Reservoir Excavation (2027) - Unmitigated
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 2 / 55

3.6. Reservoir Excavation (2027) - Mitigated

3.7. Outlet Line (2027) - Unmitigated

3.8. Outlet Line (2027) - Mitigated

3.9. Reservoir Construction (2027) - Unmitigated

3.10. Reservoir Construction (2027) - Mitigated

3.11. Pipe/Diversion/Treatment Facility/Pump/Bioswale (2027) - Unmitigated

3.12. Pipe/Diversion/Treatment Facility/Pump/Bioswale (2027) - Mitigated

3.13. Field/Bioswale/Landscaping (2027) - Unmitigated

3.14. Field/Bioswale/Landscaping (2027) - Mitigated

4. Operations Emissions Details

4.10. Soil Carbon Accumulation By Vegetation Type

4.10.1. Soil Carbon Accumulation By Vegetation Type - Unmitigated

4.10.2. Above and Belowground Carbon Accumulation by Land Use Type - Unmitigated

4.10.3. Avoided and Sequestered Emissions by Species - Unmitigated

4.10.4. Soil Carbon Accumulation By Vegetation Type - Mitigated

4.10.5. Above and Belowground Carbon Accumulation by Land Use Type - Mitigated

4.10.6. Avoided and Sequestered Emissions by Species - Mitigated

5. Activity Data
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 3 / 55

5.1. Construction Schedule

5.2. Off-Road Equipment

5.2.1. Unmitigated

5.2.2. Mitigated

5.3. Construction Vehicles

5.3.1. Unmitigated

5.3.2. Mitigated

5.4. Vehicles

5.4.1. Construction Vehicle Control Strategies

5.5. Architectural Coatings

5.6. Dust Mitigation

5.6.1. Construction Earthmoving Activities

5.6.2. Construction Earthmoving Control Strategies

5.7. Construction Paving

5.8. Construction Electricity Consumption and Emissions Factors

5.18. Vegetation

5.18.1. Land Use Change

5.18.1.1. Unmitigated
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 4 / 55

5.18.1.2. Mitigated

5.18.1. Biomass Cover Type

5.18.1.1. Unmitigated

5.18.1.2. Mitigated

5.18.2. Sequestration

5.18.2.1. Unmitigated

5.18.2.2. Mitigated

6. Climate Risk Detailed Report

6.1. Climate Risk Summary

6.2. Initial Climate Risk Scores

6.3. Adjusted Climate Risk Scores

6.4. Climate Risk Reduction Measures

7. Health and Equity Details

7.1. CalEnviroScreen 4.0 Scores

7.2. Healthy Places Index Scores

7.3. Overall Health & Equity Scores

7.4. Health & Equity Measures

7.5. Evaluation Scorecard
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 5 / 55

7.6. Health & Equity Custom Measures

8. User Changes to Default Data
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 6 / 55

1. Basic Project Information

1.1. Basic Project Information
Data Field Value
Project Name Calas Park Stormwater Capture Project Construction HRA Construction Start Date 10/1/2026
Lead Agency —
Land Use Scale Project/site
Analysis Level for Defaults County
Windspeed (m/s) 3.50
Precipitation (days) 17.4
Location 33.827447691220186, -118.2571402051142
County Los Angeles-South Coast
City Carson
Air District South Coast AQMD
Air Basin South Coast
TAZ 4617
EDFZ 7
Electric Utility Southern California Edison
Gas Utility Southern California Gas
App Version 2022.1.1.29

1.2. Land Use Types
Land Use Subtype Size Unit Lot Acreage Building Area (sq ft) Landscape Area (sq ft)
Special Landscape
Area
(sq ft)
Population Description
City Park 5.72 Acre 5.72 0.00 6,620 6,620 — Park fields Other Asphalt
Surf
aces

3.26 1000sqft 0.07 0.00 0.00 — — Pavement
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 7 / 55
Other Non-Asphalt
Surf
aces

3.49 1000sqft 0.08 0.00 0.00 — — Concrete sidewalks

1.3. User-Selected Emission Reduction Measures by Emissions Sector Sector # Measure Title
Construction C-6 Use Diesel Particulate Filters

2. Emissions Summary

2.1. Construction Emissions Compared Against Thresholds Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Un/Mit. TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 5.31 4.46 41.7 46.4 0.08 1.71 5.12 6.83 1.58 2.63 4.20 — 8,386 8,386 0.35 0.07 0.03 8,417 Mit. 5.31 4.46 41.7 46.4 0.08 0.26 5.12 5.37 0.24 2.63 2.86 — 8,386 8,386 0.35 0.07 0.03 8,417 %
Reduced
— — — — — 85% — 21% 85% — 32% — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 7.02 5.89 53.8 53.7 0.09 2.34 7.73 10.1 2.15 3.95 6.10 — 9,715 9,715 0.40 0.08 < 0.005 9,750 Mit. 7.02 5.89 53.8 53.7 0.09 0.35 7.73 8.08 0.32 3.95 4.27 — 9,715 9,715 0.40 0.08 < 0.005 9,750 %
Reduced
— — — — — 85% — 20% 85% — 30% — — — — — — —
Average
Daily
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 1.61 1.35 12.5 14.1 0.02 0.50 1.40 1.90 0.46 0.72 1.18 — 2,610 2,610 0.11 0.02 < 0.005 2,619 Mit. 1.61 1.35 12.5 14.1 0.02 0.08 1.40 1.48 0.07 0.72 0.79 — 2,610 2,610 0.11 0.02 < 0.005 2,619 Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 8 / 55
%
Reduced
— — — — — 85% — 22% 85% — 33% — — — — — — —
Annual
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 0.29 0.25 2.28 2.58 < 0.005 0.09 0.26 0.35 0.08 0.13 0.22 — 432 432 0.02 < 0.005 < 0.005 434 Mit. 0.29 0.25 2.28 2.58 < 0.005 0.01 0.26 0.27 0.01 0.13 0.14 — 432 432 0.02 < 0.005 < 0.005 434 %
Reduced
— — — — — 85% — 22% 85% — 33% — — — — — — —

2.2. Construction Emissions by Y ear, Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Y ear TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily -
Summer
(Max)
— — — — — — — — — — — — — — — — — —
2027 5.31 4.46 41.7 46.4 0.08 1.71 5.12 6.83 1.58 2.63 4.20 — 8,386 8,386 0.35 0.07 0.03 8,417 Daily -
Winter
(Max)
— — — — — — — — — — — — — — — — — —
2026 7.02 5.89 53.8 53.7 0.09 2.34 7.73 10.1 2.15 3.95 6.10 — 9,715 9,715 0.40 0.08 < 0.005 9,750 2027 5.31 4.45 41.7 42.5 0.08 1.71 5.12 6.83 1.58 2.63 4.20 — 8,387 8,387 0.35 0.07 < 0.005 8,417 Average
Daily
— — — — — — — — — — — — — — — — — —
2026 0.72 0.60 5.49 5.48 0.01 0.24 0.51 0.76 0.22 0.26 0.48 — 992 992 0.04 0.01 < 0.005 995 2027 1.61 1.35 12.5 14.1 0.02 0.50 1.40 1.90 0.46 0.72 1.18 — 2,610 2,610 0.11 0.02 < 0.005 2,619 Annual — — — — — — — — — — — — — — — — — —
2026 0.13 0.11 1.00 1.00 < 0.005 0.04 0.09 0.14 0.04 0.05 0.09 — 164 164 0.01 < 0.005 < 0.005 165 2027 0.29 0.25 2.28 2.58 < 0.005 0.09 0.26 0.35 0.08 0.13 0.22 — 432 432 0.02 < 0.005 < 0.005 434

2.3. Construction Emissions by Y ear, Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 9 / 55
Y ear TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily -
Summer
(Max)
— — — — — — — — — — — — — — — — — —
2027 5.31 4.46 41.7 46.4 0.08 0.26 5.12 5.37 0.24 2.63 2.86 — 8,386 8,386 0.35 0.07 0.03 8,417 Daily -
Winter
(Max)
— — — — — — — — — — — — — — — — — —
2026 7.02 5.89 53.8 53.7 0.09 0.35 7.73 8.08 0.32 3.95 4.27 — 9,715 9,715 0.40 0.08 < 0.005 9,750 2027 5.31 4.45 41.7 42.5 0.08 0.26 5.12 5.37 0.24 2.63 2.86 — 8,387 8,387 0.35 0.07 < 0.005 8,417 Average
Daily
— — — — — — — — — — — — — — — — — —
2026 0.72 0.60 5.49 5.48 0.01 0.04 0.51 0.55 0.03 0.26 0.29 — 992 992 0.04 0.01 < 0.005 995 2027 1.61 1.35 12.5 14.1 0.02 0.08 1.40 1.48 0.07 0.72 0.79 — 2,610 2,610 0.11 0.02 < 0.005 2,619 Annual — — — — — — — — — — — — — — — — — —
2026 0.13 0.11 1.00 1.00 < 0.005 0.01 0.09 0.10 0.01 0.05 0.05 — 164 164 0.01 < 0.005 < 0.005 165 2027 0.29 0.25 2.28 2.58 < 0.005 0.01 0.26 0.27 0.01 0.13 0.14 — 432 432 0.02 < 0.005 < 0.005 434

3. Construction Emissions Details

3.1. Demolition (2026) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 10 / 55
4,153—0.030.174,1394,139—0.98—0.981.06—1.060.0422.922.92.563.05Off-Roa d
Equipm
Demoliti
on
— — — — — — 0.06 0.06 — 0.01 0.01 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.46 0.39 3.46 3.45 0.01 0.16 — 0.16 0.15 — 0.15 — 624 624 0.03 0.01 — 626 Demoliti
on
— — — — — — 0.01 0.01 — < 0.005 < 0.005 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.08 0.07 0.63 0.63 < 0.005 0.03 — 0.03 0.03 — 0.03 — 103 103 < 0.005 < 0.005 — 104 Demoliti
on
— — — — — — < 0.005 < 0.005 — < 0.005 < 0.005 — — — — — — — Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.19 7.19 < 0.005 < 0.005 < 0.005 7.57 Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 11 / 55
Hauling 0.01 < 0.005 0.06 0.04 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 10.1 10.1 < 0.005 < 0.005 < 0.005 10.7 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.08 1.08 < 0.005 < 0.005 < 0.005 1.14 Hauling < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.52 1.52 < 0.005 < 0.005 < 0.005 1.60 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.18 0.18 < 0.005 < 0.005 < 0.005 0.19 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.25 0.25 < 0.005 < 0.005 < 0.005 0.27

3.2. Demolition (2026) - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

3.05 2.56 22.9 22.9 0.04 0.16 — 0.16 0.15 — 0.15 — 4,139 4,139 0.17 0.03 — 4,153 Demoliti
on
— — — — — — 0.06 0.06 — 0.01 0.01 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 12 / 55
626—0.010.03624624—0.02—0.020.02—0.020.013.453.460.390.46Off-Roa d
Demoliti
on
— — — — — — 0.01 0.01 — < 0.005 < 0.005 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.08 0.07 0.63 0.63 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 103 103 < 0.005 < 0.005 — 104 Demoliti
on
— — — — — — < 0.005 < 0.005 — < 0.005 < 0.005 — — — — — — — Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.19 7.19 < 0.005 < 0.005 < 0.005 7.57 Hauling 0.01 < 0.005 0.06 0.04 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 10.1 10.1 < 0.005 < 0.005 < 0.005 10.7 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.08 1.08 < 0.005 < 0.005 < 0.005 1.14 Hauling < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.52 1.52 < 0.005 < 0.005 < 0.005 1.60 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.18 0.18 < 0.005 < 0.005 < 0.005 0.19 Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 13 / 55
Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.25 0.25 < 0.005 < 0.005 < 0.005 0.27

3.3. Site Preparation (2026) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

3.95 3.32 30.7 30.6 0.05 1.28 — 1.28 1.18 — 1.18 — 5,542 5,542 0.22 0.04 — 5,561 Dust
F
rom
Material
Movement
— — — — — — 7.67 7.67 — 3.94 3.94 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.26 0.22 2.02 2.01 < 0.005 0.08 — 0.08 0.08 — 0.08 — 364 364 0.01 < 0.005 — 366 Dust
F
rom
Material
Movement
— — — — — — 0.50 0.50 — 0.26 0.26 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 14 / 55
Off-Roa
Equipment

0.05 0.04 0.37 0.37 < 0.005 0.02 — 0.02 0.01 — 0.01 — 60.3 60.3 < 0.005 < 0.005 — 60.5 Dust
F
rom
Material
Movement
— — — — — — 0.09 0.09 — 0.05 0.05 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.19 7.19 < 0.005 < 0.005 < 0.005 7.57 Hauling 0.01 < 0.005 0.06 0.04 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 10.1 10.1 < 0.005 < 0.005 < 0.005 10.7 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.47 0.47 < 0.005 < 0.005 < 0.005 0.50 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.66 0.66 < 0.005 < 0.005 < 0.005 0.70 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.08 0.08 < 0.005 < 0.005 < 0.005 0.08 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.11 0.11 < 0.005 < 0.005 < 0.005 0.12

3.4. Site Preparation (2026) - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 15 / 55
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

3.95 3.32 30.7 30.6 0.05 0.19 — 0.19 0.18 — 0.18 — 5,542 5,542 0.22 0.04 — 5,561 Dust
F
rom
Material
Movement
— — — — — — 7.67 7.67 — 3.94 3.94 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.26 0.22 2.02 2.01 < 0.005 0.01 — 0.01 0.01 — 0.01 — 364 364 0.01 < 0.005 — 366 Dust
F
rom
Material
Movement
— — — — — — 0.50 0.50 — 0.26 0.26 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.05 0.04 0.37 0.37 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 60.3 60.3 < 0.005 < 0.005 — 60.5 Dust
F
rom
Material
Movement
— — — — — — 0.09 0.09 — 0.05 0.05 — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 16 / 55

0.000.000.000.000.000.00—0.000.000.000.000.000.000.000.000.000.000.00Onsite truck
Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.19 7.19 < 0.005 < 0.005 < 0.005 7.57 Hauling 0.01 < 0.005 0.06 0.04 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 10.1 10.1 < 0.005 < 0.005 < 0.005 10.7 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.47 0.47 < 0.005 < 0.005 < 0.005 0.50 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.66 0.66 < 0.005 < 0.005 < 0.005 0.70 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.08 0.08 < 0.005 < 0.005 < 0.005 0.08 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.11 0.11 < 0.005 < 0.005 < 0.005 0.12

3.5. Reservoir Excavation (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 17 / 55
4,133—0.030.174,1194,119—0.77—0.770.83—0.830.0422.520.62.192.60Off-Roa d
Equipm
ent
Dust
F
rom
Material
Movement
— — — — — — 5.11 5.11 — 2.63 2.63 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.60 2.19 20.6 22.5 0.04 0.83 — 0.83 0.77 — 0.77 — 4,119 4,119 0.17 0.03 — 4,133 Dust
F
rom
Material
Movement
— — — — — — 5.11 5.11 — 2.63 2.63 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.55 0.46 4.35 4.75 0.01 0.18 — 0.18 0.16 — 0.16 — 869 869 0.04 0.01 — 872 Dust
F
rom
Material
Movement
— — — — — — 1.08 1.08 — 0.55 0.55 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 18 / 55
144—< 0.0050.01144144—0.03—0.030.03—0.03< 0.0050.870.790.080.10Off-Roa d
Equipm
Dust
F
rom
Material
Movement
— — — — — — 0.20 0.20 — 0.10 0.10 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.02 7.02 < 0.005 < 0.005 0.01 7.40 Hauling 0.01 0.01 0.12 0.09 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 19.7 19.7 0.01 < 0.005 0.01 20.8 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.09 7.09 < 0.005 < 0.005 < 0.005 7.46 Hauling 0.01 < 0.005 0.12 0.09 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 19.9 19.9 0.01 < 0.005 < 0.005 21.1 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.49 1.49 < 0.005 < 0.005 < 0.005 1.57 Hauling < 0.005 < 0.005 0.03 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 4.18 4.18 < 0.005 < 0.005 < 0.005 4.41 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.25 0.25 < 0.005 < 0.005 < 0.005 0.26 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.69 0.69 < 0.005 < 0.005 < 0.005 0.73 Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 19 / 55

3.6. Reservoir Excavation (2027) - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.60 2.19 20.6 22.5 0.04 0.13 — 0.13 0.12 — 0.12 — 4,119 4,119 0.17 0.03 — 4,133 Dust
F
rom
Material
Movement
— — — — — — 5.11 5.11 — 2.63 2.63 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.60 2.19 20.6 22.5 0.04 0.13 — 0.13 0.12 — 0.12 — 4,119 4,119 0.17 0.03 — 4,133 Dust
F
rom
Material
Movement
— — — — — — 5.11 5.11 — 2.63 2.63 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.55 0.46 4.35 4.75 0.01 0.03 — 0.03 0.02 — 0.02 — 869 869 0.04 0.01 — 872 Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 20 / 55
Dust
F
rom
Material
Movement
— — — — — — 1.08 1.08 — 0.55 0.55 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.10 0.08 0.79 0.87 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 144 144 0.01 < 0.005 — 144 Dust
F
rom
Material
Movement
— — — — — — 0.20 0.20 — 0.10 0.10 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.02 7.02 < 0.005 < 0.005 0.01 7.40 Hauling 0.01 0.01 0.12 0.09 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 19.7 19.7 0.01 < 0.005 0.01 20.8 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.09 7.09 < 0.005 < 0.005 < 0.005 7.46 Hauling 0.01 < 0.005 0.12 0.09 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 19.9 19.9 0.01 < 0.005 < 0.005 21.1 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.49 1.49 < 0.005 < 0.005 < 0.005 1.57 Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 21 / 55
Hauling < 0.005 < 0.005 0.03 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 4.18 4.18 < 0.005 < 0.005 < 0.005 4.41 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.25 0.25 < 0.005 < 0.005 < 0.005 0.26 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.69 0.69 < 0.005 < 0.005 < 0.005 0.73

3.7. Outlet Line (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.60 2.19 20.6 22.5 0.04 0.83 — 0.83 0.77 — 0.77 — 4,119 4,119 0.17 0.03 — 4,133 Dust
F
rom
Material
Movement
— — — — — — 5.11 5.11 — 2.63 2.63 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.16 0.14 1.30 1.42 < 0.005 0.05 — 0.05 0.05 — 0.05 — 260 260 0.01 < 0.005 — 260 Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 22 / 55
———————0.170.17—0.320.32——————Dust
F
rom
Material
Mo
vement
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.03 0.03 0.24 0.26 < 0.005 0.01 — 0.01 0.01 — 0.01 — 43.0 43.0 < 0.005 < 0.005 — 43.1 Dust
F
rom
Material
Movement
— — — — — — 0.06 0.06 — 0.03 0.03 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.02 7.02 < 0.005 < 0.005 0.01 7.40 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.44 0.44 < 0.005 < 0.005 < 0.005 0.47 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 23 / 55
Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.07 0.07 < 0.005 < 0.005 < 0.005 0.08 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

3.8. Outlet Line (2027) - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.60 2.19 20.6 22.5 0.04 0.13 — 0.13 0.12 — 0.12 — 4,119 4,119 0.17 0.03 — 4,133 Dust
F
rom
Material
Movement
— — — — — — 5.11 5.11 — 2.63 2.63 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.16 0.14 1.30 1.42 < 0.005 0.01 — 0.01 0.01 — 0.01 — 260 260 0.01 < 0.005 — 260 Dust
F
rom
Material
Movement
— — — — — — 0.32 0.32 — 0.17 0.17 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 24 / 55
Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.03 0.03 0.24 0.26 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 43.0 43.0 < 0.005 < 0.005 — 43.1 Dust
F
rom
Material
Movement
— — — — — — 0.06 0.06 — 0.03 0.03 — — — — — — —
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.04 0.03 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 7.02 7.02 < 0.005 < 0.005 0.01 7.40 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.44 0.44 < 0.005 < 0.005 < 0.005 0.47 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.07 0.07 < 0.005 < 0.005 < 0.005 0.08 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

3.9. Reservoir Construction (2027) - Unmitigated
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 25 / 55
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.69 2.26 20.9 19.8 0.04 0.88 — 0.88 0.81 — 0.81 — 4,238 4,238 0.17 0.03 — 4,252 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.69 2.26 20.9 19.8 0.04 0.88 — 0.88 0.81 — 0.81 — 4,238 4,238 0.17 0.03 — 4,252 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.41 0.34 3.15 2.99 0.01 0.13 — 0.13 0.12 — 0.12 — 639 639 0.03 0.01 — 641 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.07 0.06 0.58 0.54 < 0.005 0.02 — 0.02 0.02 — 0.02 — 106 106 < 0.005 < 0.005 — 106 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 26 / 55
Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.51 3.51 < 0.005 < 0.005 < 0.005 3.70 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.54 3.54 < 0.005 < 0.005 < 0.005 3.73 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.53 0.53 < 0.005 < 0.005 < 0.005 0.56 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.09 0.09 < 0.005 < 0.005 < 0.005 0.09 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

3.10. Reservoir Construction (2027) - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 27 / 55
4,252—0.030.174,2384,238—0.12—0.120.13—0.130.0419.820.92.262.69Off-Roa d
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

2.69 2.26 20.9 19.8 0.04 0.13 — 0.13 0.12 — 0.12 — 4,238 4,238 0.17 0.03 — 4,252 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.41 0.34 3.15 2.99 0.01 0.02 — 0.02 0.02 — 0.02 — 639 639 0.03 0.01 — 641 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.07 0.06 0.58 0.54 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 106 106 < 0.005 < 0.005 — 106 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.51 3.51 < 0.005 < 0.005 < 0.005 3.70 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 28 / 55
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.54 3.54 < 0.005 < 0.005 < 0.005 3.73 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.53 0.53 < 0.005 < 0.005 < 0.005 0.56 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.09 0.09 < 0.005 < 0.005 < 0.005 0.09 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

3.11. Pipe/Diversion/Treatment Facility/Pump/Bioswale (2027) - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.97 0.82 7.34 8.88 0.02 0.26 — 0.26 0.24 — 0.24 — 1,895 1,895 0.08 0.02 — 1,901 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 29 / 55
Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.15 0.12 1.11 1.34 < 0.005 0.04 — 0.04 0.04 — 0.04 — 286 286 0.01 < 0.005 — 287 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.03 0.02 0.20 0.24 < 0.005 0.01 — 0.01 0.01 — 0.01 — 47.3 47.3 < 0.005 < 0.005 — 47.4 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.51 3.51 < 0.005 < 0.005 < 0.005 3.70 Hauling 0.01 < 0.005 0.06 0.04 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 9.85 9.85 < 0.005 < 0.005 0.01 10.4 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.53 0.53 < 0.005 < 0.005 < 0.005 0.56 Hauling < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.49 1.49 < 0.005 < 0.005 < 0.005 1.57 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.09 0.09 < 0.005 < 0.005 < 0.005 0.09 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.25 0.25 < 0.005 < 0.005 < 0.005 0.26 Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 30 / 55

3.12. Pipe/Diversion/Treatment Facility/Pump/Bioswale (2027) - Mitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.97 0.82 7.34 8.88 0.02 0.04 — 0.04 0.04 — 0.04 — 1,895 1,895 0.08 0.02 — 1,901 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.15 0.12 1.11 1.34 < 0.005 0.01 — 0.01 0.01 — 0.01 — 286 286 0.01 < 0.005 — 287 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.03 0.02 0.20 0.24 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 47.3 47.3 < 0.005 < 0.005 — 47.4 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 31 / 55
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.51 3.51 < 0.005 < 0.005 < 0.005 3.70 Hauling 0.01 < 0.005 0.06 0.04 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 9.85 9.85 < 0.005 < 0.005 0.01 10.4 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.53 0.53 < 0.005 < 0.005 < 0.005 0.56 Hauling < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 1.49 1.49 < 0.005 < 0.005 < 0.005 1.57 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.09 0.09 < 0.005 < 0.005 < 0.005 0.09 Hauling < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.25 0.25 < 0.005 < 0.005 < 0.005 0.26

3.13. Field/Bioswale/Landscaping (2027) - Unmitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

1.39 1.17 10.6 14.9 0.02 0.42 — 0.42 0.38 — 0.38 — 2,271 2,271 0.09 0.02 — 2,279 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 32 / 55
Off-Roa
Equipment

1.39 1.17 10.6 14.9 0.02 0.42 — 0.42 0.38 — 0.38 — 2,271 2,271 0.09 0.02 — 2,279 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.34 0.28 2.55 3.60 0.01 0.10 — 0.10 0.09 — 0.09 — 548 548 0.02 < 0.005 — 549 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.06 0.05 0.47 0.66 < 0.005 0.02 — 0.02 0.02 — 0.02 — 90.7 90.7 < 0.005 < 0.005 — 91.0 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.51 3.51 < 0.005 < 0.005 < 0.005 3.70 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.54 3.54 < 0.005 < 0.005 < 0.005 3.73 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 33 / 55
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.85 0.85 < 0.005 < 0.005 < 0.005 0.89 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.14 0.14 < 0.005 < 0.005 < 0.005 0.15 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

3.14. Field/Bioswale/Landscaping (2027) - Mitigated
Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Location TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Onsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

1.39 1.17 10.6 14.9 0.02 0.06 — 0.06 0.06 — 0.06 — 2,271 2,271 0.09 0.02 — 2,279 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

1.39 1.17 10.6 14.9 0.02 0.06 — 0.06 0.06 — 0.06 — 2,271 2,271 0.09 0.02 — 2,279 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 34 / 55
549—< 0.0050.02548548—0.01—0.010.02—0.020.013.602.550.280.34Off-Roa d
Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.06 0.05 0.47 0.66 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 90.7 90.7 < 0.005 < 0.005 — 91.0 Onsite
tr
uck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Offsite — — — — — — — — — — — — — — — — — —
Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.51 3.51 < 0.005 < 0.005 < 0.005 3.70 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 0.02 0.02 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 3.54 3.54 < 0.005 < 0.005 < 0.005 3.73 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Average
Daily
— — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.85 0.85 < 0.005 < 0.005 < 0.005 0.89 Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Annual — — — — — — — — — — — — — — — — — —
Worker 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.14 0.14 < 0.005 < 0.005 < 0.005 0.15 Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 35 / 55
Hauling 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00

4. Operations Emissions Details

4.10. Soil Carbon Accumulation By Vegetation Type

4.10.1. Soil Carbon Accumulation By Vegetation Type - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Vegetati
on
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

4.10.2. Above and Belowground Carbon Accumulation by Land Use Type - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land
Use
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 36 / 55
Total — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

4.10.3. Avoided and Sequestered Emissions by Species - Unmitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Species TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 37 / 55
Annual — — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —

4.10.4. Soil Carbon Accumulation By Vegetation Type - Mitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Vegetati
on
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

4.10.5. Above and Belowground Carbon Accumulation by Land Use Type - Mitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Land
Use
TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 38 / 55
——————————————————Daily,
Summer
(Max)
Total — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Total — — — — — — — — — — — — — — — — — —

4.10.6. Avoided and Sequestered Emissions by Species - Mitigated Criteria Pollutants (lb/day for daily, ton/yr for annual) and GHGs (lb/day for daily, MT/yr for annual) Species TOG ROG NOx CO SO2 PM10E PM10D PM10T PM2.5E PM2.5D PM2.5T BCO2 NBCO2 CO2T CH4 N2O R CO2e Daily,
Summer
(Max)
— — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 39 / 55
——————————————————Sequest
ered
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —

5. Activity Data

5.1. Construction Schedule
Phase Name Phase Type Start Date End Date Days Per Week Work Days per Phase Phase Description Demolition Demolition 10/1/2026 12/16/2026 5.00 55.0 —
Site Preparation Site Preparation 11/30/2026 12/31/2026 5.00 24.0 — Reservoir Excavation Grading 1/1/2027 4/19/2027 5.00 77.0 — Outlet Line Grading 8/1/2027 9/1/2027 5.00 23.0 —
Reservoir Construction Building Construction 3/16/2027 5/31/2027 5.00 55.0 — Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Building Construction 6/1/2027 8/16/2027 5.00 55.0 —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 40 / 55
—88.05.0012/1/20277/31/2027Building ConstructionField/Bioswale/Landscapi ng

5.2. Off-Road Equipment

5.2.1. Unmitigated
Phase Name Equipment Type Fuel Type Engine Tier Number per Day Hours Per Day Horsepower Load Factor Demolition Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40 Demolition Skid Steer Loaders Diesel Average 1.00 8.00 71.0 0.37 Demolition Graders Diesel Average 2.00 8.00 148 0.41
Site Preparation Rubber Tired Dozers Diesel Average 3.00 8.00 367 0.40 Site Preparation Concrete/Industrial
Sa
ws
Diesel Average 1.00 8.00 33.0 0.73
Site Preparation Tractors/Loaders/Back
hoes
Diesel Average 4.00 8.00 84.0 0.37
Reservoir Excavation Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40 Reservoir Excavation Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37 Reservoir Excavation Tractors/Loaders/Back
hoes
Diesel Average 3.00 8.00 84.0 0.37
Outlet Line Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40 Outlet Line Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37 Outlet Line Tractors/Loaders/Back
hoes
Diesel Average 3.00 8.00 84.0 0.37
Reservoir
Constr
uction
Cranes Diesel Average 1.00 8.00 367 0.29
Reservoir
Constr
uction
Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40
Reservoir
Constr
uction
Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 41 / 55

0.293678.001.00AverageDieselCranesPipe/Diversion/Treatm ent
F
acility/Pump/Bioswal
e
Pipe/Diversion/Treatm
ent
F
acility/Pump/Bioswal
e
Trenchers Diesel Average 2.00 8.00 40.0 0.50
Pipe/Diversion/Treatm
ent
F
acility/Pump/Bioswal
e
Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37
Field/Bioswale/Landsc
aping
Graders Diesel Average 1.00 8.00 148 0.41
Field/Bioswale/Landsc
aping
Skid Steer Loaders Diesel Average 1.00 8.00 71.0 0.37
Field/Bioswale/Landsc
aping
Pavers Diesel Average 1.00 8.00 81.0 0.42
Field/Bioswale/Landsc
aping
Paving Equipment Diesel Average 1.00 8.00 89.0 0.36
Field/Bioswale/Landsc
aping
Rollers Diesel Average 1.00 8.00 36.0 0.38
Field/Bioswale/Landsc
aping
Off-Highway Tractors Diesel Average 1.00 8.00 38.0 0.44 Field/Bioswale/Landsc
aping
Off-Highway Tractors Diesel Average 1.00 8.00 38.0 0.44 Field/Bioswale/Landsc
aping
Forklifts Diesel Average 1.00 8.00 82.0 0.20
Field/Bioswale/Landsc
aping
Cement and Mortar
Mix
ers
Diesel Average 1.00 8.00 10.0 0.56
Field/Bioswale/Landsc
aping
Aerial Lifts Diesel Average 1.00 8.00 46.0 0.31

5.2.2. Mitigated
Phase Name Equipment Type Fuel Type Engine Tier Number per Day Hours Per Day Horsepower Load Factor Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 42 / 55
Demolition Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40 Demolition Skid Steer Loaders Diesel Average 1.00 8.00 71.0 0.37 Demolition Graders Diesel Average 2.00 8.00 148 0.41
Site Preparation Rubber Tired Dozers Diesel Average 3.00 8.00 367 0.40 Site Preparation Concrete/Industrial
Sa
ws
Diesel Average 1.00 8.00 33.0 0.73
Site Preparation Tractors/Loaders/Back
hoes
Diesel Average 4.00 8.00 84.0 0.37
Reservoir Excavation Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40 Reservoir Excavation Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37 Reservoir Excavation Tractors/Loaders/Back
hoes
Diesel Average 3.00 8.00 84.0 0.37
Outlet Line Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40 Outlet Line Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37 Outlet Line Tractors/Loaders/Back
hoes
Diesel Average 3.00 8.00 84.0 0.37
Reservoir
Constr
uction
Cranes Diesel Average 1.00 8.00 367 0.29
Reservoir
Constr
uction
Rubber Tired Dozers Diesel Average 2.00 8.00 367 0.40
Reservoir
Constr
uction
Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37
Pipe/Diversion/Treatm
ent
F
acility/Pump/Bioswal
e
Cranes Diesel Average 1.00 8.00 367 0.29
Pipe/Diversion/Treatm
ent
F
acility/Pump/Bioswal
e
Trenchers Diesel Average 2.00 8.00 40.0 0.50
Pipe/Diversion/Treatm
ent
F
acility/Pump/Bioswal
e
Skid Steer Loaders Diesel Average 2.00 8.00 71.0 0.37
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 43 / 55
Field/Bioswale/Landsc Graders Diesel Average 1.00 8.00 148 0.41 Field/Bioswale/Landsc
aping
Skid Steer Loaders Diesel Average 1.00 8.00 71.0 0.37
Field/Bioswale/Landsc
aping
Pavers Diesel Average 1.00 8.00 81.0 0.42
Field/Bioswale/Landsc
aping
Paving Equipment Diesel Average 1.00 8.00 89.0 0.36
Field/Bioswale/Landsc
aping
Rollers Diesel Average 1.00 8.00 36.0 0.38
Field/Bioswale/Landsc
aping
Off-Highway Tractors Diesel Average 1.00 8.00 38.0 0.44 Field/Bioswale/Landsc
aping
Off-Highway Tractors Diesel Average 1.00 8.00 38.0 0.44 Field/Bioswale/Landsc
aping
Forklifts Diesel Average 1.00 8.00 82.0 0.20
Field/Bioswale/Landsc
aping
Cement and Mortar
Mix
ers
Diesel Average 1.00 8.00 10.0 0.56
Field/Bioswale/Landsc
aping
Aerial Lifts Diesel Average 1.00 8.00 46.0 0.31

5.3. Construction Vehicles

5.3.1. Unmitigated
Phase Name Trip Type One-Way Trips per Day Miles per Trip Vehicle Mix Demolition — — — —
Demolition Worker 0.00 0.00 LDA,LDT1,LDT2
Demolition Vendor 4.00 0.25 HHDT,MHDT
Demolition Hauling 4.00 0.25 HHDT
Demolition Onsite truck — — HHDT
Site Preparation — — — —
Site Preparation Worker 0.00 0.00 LDA,LDT1,LDT2
Site Preparation Vendor 4.00 0.25 HHDT,MHDT
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 44 / 55
Site Preparation Hauling 4.00 0.25 HHDT
Site Preparation Onsite truck — — HHDT
Reservoir Excavation — — — —
Reservoir Excavation Worker 0.00 0.00 LDA,LDT1,LDT2
Reservoir Excavation Vendor 4.00 0.25 HHDT,MHDT
Reservoir Excavation Hauling 8.00 0.25 HHDT
Reservoir Excavation Onsite truck — — HHDT
Reservoir Construction — — — —
Reservoir Construction Worker 0.00 0.00 LDA,LDT1,LDT2
Reservoir Construction Vendor 2.00 0.25 HHDT,MHDT
Reservoir Construction Hauling 0.00 0.25 HHDT
Reservoir Construction Onsite truck — — HHDT
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
— — — —
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Worker 0.00 0.00 LDA,LDT1,LDT2
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Vendor 2.00 0.25 HHDT,MHDT
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Hauling 4.00 0.25 HHDT
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Onsite truck — — HHDT
Field/Bioswale/Landscaping — — — —
Field/Bioswale/Landscaping Worker 0.00 0.00 LDA,LDT1,LDT2 Field/Bioswale/Landscaping Vendor 2.00 0.25 HHDT,MHDT
Field/Bioswale/Landscaping Hauling 0.00 0.25 HHDT
Field/Bioswale/Landscaping Onsite truck — — HHDT
Outlet Line — — — —
Outlet Line Worker 0.00 0.00 LDA,LDT1,LDT2
Outlet Line Vendor 4.00 0.25 HHDT,MHDT
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 45 / 55
Outlet Line Hauling 0.00 0.25 HHDT
Outlet Line Onsite truck — — HHDT

5.3.2. Mitigated
Phase Name Trip Type One-Way Trips per Day Miles per Trip Vehicle Mix Demolition — — — —
Demolition Worker 0.00 0.00 LDA,LDT1,LDT2
Demolition Vendor 4.00 0.25 HHDT,MHDT
Demolition Hauling 4.00 0.25 HHDT
Demolition Onsite truck — — HHDT
Site Preparation — — — —
Site Preparation Worker 0.00 0.00 LDA,LDT1,LDT2
Site Preparation Vendor 4.00 0.25 HHDT,MHDT
Site Preparation Hauling 4.00 0.25 HHDT
Site Preparation Onsite truck — — HHDT
Reservoir Excavation — — — —
Reservoir Excavation Worker 0.00 0.00 LDA,LDT1,LDT2
Reservoir Excavation Vendor 4.00 0.25 HHDT,MHDT
Reservoir Excavation Hauling 8.00 0.25 HHDT
Reservoir Excavation Onsite truck — — HHDT
Reservoir Construction — — — —
Reservoir Construction Worker 0.00 0.00 LDA,LDT1,LDT2
Reservoir Construction Vendor 2.00 0.25 HHDT,MHDT
Reservoir Construction Hauling 0.00 0.25 HHDT
Reservoir Construction Onsite truck — — HHDT
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
— — — —
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Worker 0.00 0.00 LDA,LDT1,LDT2
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 46 / 55
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Vendor 2.00 0.25 HHDT,MHDT
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Hauling 4.00 0.25 HHDT
Pipe/Diversion/Treatment
F
acility/Pump/Bioswale
Onsite truck — — HHDT
Field/Bioswale/Landscaping — — — —
Field/Bioswale/Landscaping Worker 0.00 0.00 LDA,LDT1,LDT2 Field/Bioswale/Landscaping Vendor 2.00 0.25 HHDT,MHDT
Field/Bioswale/Landscaping Hauling 0.00 0.25 HHDT
Field/Bioswale/Landscaping Onsite truck — — HHDT
Outlet Line — — — —
Outlet Line Worker 0.00 0.00 LDA,LDT1,LDT2
Outlet Line Vendor 4.00 0.25 HHDT,MHDT
Outlet Line Hauling 0.00 0.25 HHDT
Outlet Line Onsite truck — — HHDT

5.4. Vehicles

5.4.1. Construction Vehicle Control Strategies
Non-applicable. No control strategies activated by user.

5.5. Architectural Coatings
Phase Name Residential Interior Area
Coated
(sq ft)
Residential Exterior Area
Coated
(sq ft)
Non-Residential Interior Area
Coated
(sq ft)
Non-Residential Exterior Area
Coated
(sq ft)
Parking Area Coated (sq ft)

5.6. Dust Mitigation

5.6.1. Construction Earthmoving Activities
Phase Name Material Imported (cy) Material Exported (cy) Acres Graded (acres) Material Demolished (Ton of Debr
is)
Acres Paved (acres)
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 47 / 55
Demolition 0.00 0.00 0.00 141 —
Site Preparation — — 36.0 0.00 —
Reservoir Excavation — 3,980 100 0.00 —
Outlet Line — — 23.0 0.00 —

5.6.2. Construction Earthmoving Control Strategies
Control Strategies Applied Frequency (per day) PM10 Reduction PM2.5 Reduction Water Exposed Area 2 61% 61%

5.7. Construction Paving
Land Use Area Paved (acres) % Asphalt
City Park 0.00 0%
Other Asphalt Surfaces 0.07 100%
Other Non-Asphalt Surfaces 0.08 0%

5.8. Construction Electricity Consumption and Emissions Factors kWh per Y ear and Emission Factor (lb/MWh)
Y ear kWh per Y ear CO2 CH4 N2O
2026 0.00 532 0.03 < 0.005
2027 0.00 532 0.03 < 0.005

5.18. Vegetation

5.18.1. Land Use Change

5.18.1.1. Unmitigated
Vegetation Land Use Type Vegetation Soil Type Initial Acres Final Acres Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 48 / 55

5.18.1.2. Mitigated
Vegetation Land Use Type Vegetation Soil Type Initial Acres Final Acres

5.18.1. Biomass Cover Type

5.18.1.1. Unmitigated
Biomass Cover Type Initial Acres Final Acres

5.18.1.2. Mitigated
Biomass Cover Type Initial Acres Final Acres

5.18.2. Sequestration

5.18.2.1. Unmitigated
Tree Type Number Electricity Saved (kWh/year) Natural Gas Saved (btu/year)

5.18.2.2. Mitigated
Tree Type Number Electricity Saved (kWh/year) Natural Gas Saved (btu/year)

6. Climate Risk Detailed Report

6.1. Climate Risk Summary
Cal-Adapt midcentury 2040–2059 average projections for four hazards are reported below for your project location. These are under Representation Concentration Pathway (RCP) 8.5 which assumes
GHG emissions will continue to rise strongly through 2050 and then plateau around 2100.

Climate Hazard Result for Project Location Unit
Temperature and Extreme Heat 5.08 annual days of extreme heat Extreme Precipitation 4.20 annual days with precipitation above 20 mm Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 49 / 55
Sea Level Rise — meters of inundation depth
Wildfire 0.00 annual hectares burned
Temperature and Extreme Heat data are for grid cell in which your project are located. The projection is based on the 98th historical percentile of daily maximum/minimum temperatures from obser
ved historical data (32 climate model ensemble from Cal-Adapt, 2040–2059 average under RCP 8.5). Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

Extreme Precipitation data are for the grid cell in which your project are located. The threshold of 20 mm is equivalent to about ¾ an inch of rain, which would be light to moderate rainfall if receiv
ed over a full day or heavy rain if received over a period of 2 to 4 hours. Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

Sea Level Rise data are for the grid cell in which your project are located. The projections are from Radke et al. (2017), as reported in Cal-Adapt (Radke et al., 2017, CEC-500-2017-008), and consider
inundation location and depth for the San Francisco Bay, the Sacramento-San Joaquin River Delta and California coast resulting different increments of sea level rise coupled with extreme storm events. Users may select from four scenarios to view the range in potential inundation depth for the grid cell. The four scenarios are: No rise, 0.5 meter, 1.0 meter, 1.41 meters Wildfire data are for the grid cell in which your project are located. The projections are from UC Davis, as reported in Cal-Adapt (2040–2059 average under RCP 8.5), and consider historical data of
climate, vegetation, population density, and large (> 400 ha) fire history. Users may select from four model simulations to view the range in potential wildfire probabilities for the grid cell. The four simulations make different assumptions about expected rainfall and temperature are: Warmer/drier (HadGEM2-ES), Cooler/wetter (CNRM-CM5), Average conditions (CanESM2), Range of different rainfall and temperature possibilities (MIROC5). Each grid cell is 6 kilometers (km) by 6 km, or 3.7 miles (mi) by 3.7 mi.

6.2. Initial Climate Risk Scores
Climate Hazard Exposure Score Sensitivity Score Adaptive Capacity Score Vulnerability Score Temperature and Extreme Heat 1 0 0 N/A
Extreme Precipitation N/A N/A N/A N/A
Sea Level Rise 1 0 0 N/A
Wildfire 1 0 0 N/A
Flooding N/A N/A N/A N/A
Drought N/A N/A N/A N/A
Snowpack Reduction N/A N/A N/A N/A
Air Quality Degradation 0 0 0 N/A
The sensitivity score reflects the extent to which a project would be adversely affected by exposure to a climate hazard. Exposure is rated on a scale of 1 to 5, with a score of 5 representing the g
reatest exposure.

The adaptive capacity of a project refers to its ability to manage and reduce vulnerabilities from projected climate hazards. Adaptive capacity is rated on a scale of 1 to 5, with a score of 5 representing
the greatest ability to adapt.

The overall vulnerability scores are calculated based on the potential impacts and adaptive capacity assessments for each hazard. Scores do not include implementation of climate risk reduction measures
.

6.3. Adjusted Climate Risk Scores
Climate Hazard Exposure Score Sensitivity Score Adaptive Capacity Score Vulnerability Score Temperature and Extreme Heat 1 1 1 2
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 50 / 55
Extreme Precipitation N/A N/A N/A N/A
Sea Level Rise 1 1 1 2
Wildfire 1 1 1 2
Flooding N/A N/A N/A N/A
Drought N/A N/A N/A N/A
Snowpack Reduction N/A N/A N/A N/A
Air Quality Degradation 1 1 1 2
The sensitivity score reflects the extent to which a project would be adversely affected by exposure to a climate hazard. Exposure is rated on a scale of 1 to 5, with a score of 5 representing the g
reatest exposure.

The adaptive capacity of a project refers to its ability to manage and reduce vulnerabilities from projected climate hazards. Adaptive capacity is rated on a scale of 1 to 5, with a score of 5 representing
the greatest ability to adapt.

The overall vulnerability scores are calculated based on the potential impacts and adaptive capacity assessments for each hazard. Scores include implementation of climate risk reduction measures
.

6.4. Climate Risk Reduction Measures

7. Health and Equity Details

7.1. CalEnviroScreen 4.0 Scores
The maximum CalEnviroScreen score is 100. A high score (i.e., greater than 50) reflects a higher pollution burden compared to other census tracts in the state.

Indicator Result for Project Census Tract
Exposure Indicators —
AQ-Ozone 22.2
AQ-PM 80.6
AQ-DPM 86.0
Drinking Water 29.4
Lead Risk Housing 59.8
Pesticides 0.00
Toxic Releases 98.8
Traffic 95.4
Effect Indicators —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 51 / 55
CleanUp Sites 89.2
Groundwater 94.0
Haz Waste Facilities/Generators 67.0
Impaired Water Bodies 93.4
Solid Waste 54.8
Sensitive Population —
Asthma 76.6
Cardio-vascular 82.7
Low Birth Weights 74.9
Socioeconomic Factor Indicators —
Education 62.2
Housing 28.2
Linguistic 77.1
Poverty 49.7
Unemployment 43.1

7.2. Healthy Places Index Scores
The maximum Health Places Index score is 100. A high score (i.e., greater than 50) reflects healthier community conditions compared to other census tracts in the state.

Indicator Result for Project Census Tract
Economic —
Above Poverty 57.92377775
Employed 62.37649172
Median HI 55.88348518
Education —
Bachelor's or higher 53.18875914
High school enrollment 100
Preschool enrollment 48.45374054
Transportation —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 52 / 55
Auto Access 31.27165405
Active commuting 35.41639933
Social —
2-parent households 72.60361863
Voting 9.29038881
Neighborhood —
Alcohol availability 51.72590787
Park access 27.21673297
Retail density 43.47491338
Supermarket access 40.56204286
Tree canopy 50.87899397
Housing —
Homeownership 92.2751187
Housing habitability 75.06736815
Low-inc homeowner severe housing cost burden 74.6439112 Low-inc renter severe housing cost burden 51.52059541
Uncrowded housing 28.33311947
Health Outcomes —
Insured adults 43.11561658
Arthritis 59.3
Asthma ER Admissions 30.5
High Blood Pressure 37.6
Cancer (excluding skin) 49.7
Asthma 94.4
Coronary Heart Disease 54.4
Chronic Obstructive Pulmonary Disease 74.0
Diagnosed Diabetes 25.3
Life Expectancy at Birth 63.6
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 53 / 55
Cognitively Disabled 50.3
Physically Disabled 14.3
Heart Attack ER Admissions 25.8
Mental Health Not Good 69.9
Chronic Kidney Disease 45.1
Obesity 76.5
Pedestrian Injuries 19.6
Physical Health Not Good 51.8
Stroke 51.7
Health Risk Behaviors —
Binge Drinking 89.1
Current Smoker 71.8
No Leisure Time for Physical Activity 41.3
Climate Change Exposures —
Wildfire Risk 0.0
SLR Inundation Area 0.0
Children 68.4
Elderly 14.5
English Speaking 25.4
Foreign-born 90.0
Outdoor Workers 75.3
Climate Change Adaptive Capacity —
Impervious Surface Cover 11.0
Traffic Density 92.2
Traffic Access 61.6
Other Indices —
Hardship 56.0
Other Decision Support —
Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 54 / 55
2016 Voting 18.3

7.3. Overall Health & Equity Scores
Metric Result for Project Census Tract
CalEnviroScreen 4.0 Score for Project Location (a) 92.0 Healthy Places Index Score for Project Location (b) 51.0 Project Located in a Designated Disadvantaged Community (Senate Bill 535) Y es Project Located in a Low-Income Community (Assembly Bill 1550) Y es Project Located in a Community Air Protection Program Community (Assembly Bill 617) Wilmington Long Beach Carson a: The maximum CalEnviroScreen score is 100. A high score (i.e., greater than 50) reflects a higher pollution burden compared to other census tracts in the state. b: The maximum Health Places Index score is 100. A high score (i.e., greater than 50) reflects healthier community conditions compared to other census tracts in the state.

7.4. Health & Equity Measures
No Health & Equity Measures selected.

7.5. Evaluation Scorecard
Health & Equity Evaluation Scorecard not completed.

7.6. Health & Equity Custom Measures
No Health & Equity Custom Measures created.

8. User Changes to Default Data
Screen Justification
Construction: Construction Phases Adjusted default construction phases and durations based on Project description.

Construction: Off-Road Equipment Revised default equipment assumptions based on Project Description Construction: Trips and VMT Conservatively rounded default trips up to nearest even number. Added vendor trips to account f
or water and delivery trucks. 0.25 miles for on-site travel of trucks for construction HRA.

Construction: Dust From Material Movement Excavation quantities provided by applicant.

Operations: Solid Waste No increase in solid waste compared to existing conditions.

Operations: Refrigerants No increase in refrigerants compared to existing conditions.

Calas Park Stormwater Capture Project Construction HRA Detailed Report, 6/25/2025 55 / 55
Operations: Water and Waste Water No increase in outdoor water use compared to existing conditions.

Operations: Off-Road Equipment Larger electric pump to pump treated stormwater into the proposed bioswale (HP from project design
plans). Smaller booster pump to assist the existing irrigation system (default HP). ** Lak
es Environmental AERMOD MPI
**
****************************************
**
** AERMOD Input Produced by:
** AERMOD View Ver. 13.0.0
** Lakes Environmental Software Inc.
** Date: 6/25/2025
** File: C:\Users\anoll\OneDrive - Dudek\Desktop\HARP2\Carson Calas Park Stormwater Capture\Carson Calas Park Stormwater Capture.ADI
**
****************************************
**
**
****************************************
** AERMOD Control Pathway
****************************************
**
**

CO STARTING
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MODELOPT DFAULT CONC
AVERTIME 1 PERIOD
URBANOPT 9663345
POLLUTID PM_10

RUNORNOT RUN
ERRORFIL "Carson Calas Park Stormwater Capture.err"

CO FINISHED
**
****************************************
** AERMOD Source Pathway
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**

SO STARTING
** Source Location **
** Source ID - Type - X Coord. - Y Coord. **
** --------------------------------------------------------------------- ** Line Source Represented by Adjacent Volume Sources
** LINE VOLUME Source ID = SLINE1
** DESCRSRC Offroad Equipment and Truck Exhaust
** PREFIX
** Length of Side = 10.00
** Configuration = Adjacent
** Emission Rate = 1.0
** Vertical Dimension = 10.00
** SZINIT = 4.65
** Nodes = 24
** 383465.783, 3743795.557, 6.95, 5.00, 4.65
** 383465.783, 3743785.184, 6.96, 5.00, 4.65
** 383
820.230, 3743777.183, 6.48, 5.00, 4.65
** 383819.637, 3743737.470, 7.49, 5.00, 4.65
** 383808.968, 3743730.358, 7.47, 5.00, 4.65
** 383769.848, 3743724.134, 6.96, 5.00, 4.65
** 383769.848, 3743687.386, 6.88, 5.00, 4.65
** 383634.115, 3743687.386, 7.29, 5.00, 4.65
** 383636.783, 3743766.810, 7.07, 5.00, 4.65
** 383803.041, 3743762.661, 6.48, 5.00, 4.65
** 383803.041, 3743743.694, 6.62, 5.00, 4.65
** 383754.734, 3743735.989, 6.70, 5.00, 4.65
** 383755.327, 3743701.611, 6.85, 5.00, 4.65
** 383648.933, 3743701.314, 7.28, 5.00, 4.65
** 383649.526, 3743752.288, 7.30, 5.00, 4.65
** 383671.457, 3743751.696, 7.05, 5.00, 4.65
** 383668.493, 3743715.836, 7.08, 5.00, 4.65
** 383691.017, 3743716.132, 6.91, 5.00, 4.65
** 383691.609, 3743751.103, 6.83, 5.00, 4.65
** 383711.169, 3743750.214, 6.68, 5.00, 4.65
** 383711.465, 3743715.540, 6.86, 5.00, 4.65
** 383734.285, 3743715.540, 6.80, 5.00, 4.65
** 383732.803, 3743752.288, 6.52, 5.00, 4.65
** 383778.146, 3743752.881, 6.53, 5.00, 4.65
** --------------------------------------------------------------------- LOCATION L0000001 VOLUME 383465.783 3743790.557 6.96 LOCATION L0000002 VOLUME 383470.409 3743785.080 6.98 LOCATION L0000003 VOLUME 383480.406 3743784.854 7.00 LOCATION L0000004 VOLUME 383490.404 3743784.629 7.03 LOCATION L0000005 VOLUME 383500.401 3743784.403 7.04 LOCATION L0000006 VOLUME 383510.399 3743784.177 7.05 LOCATION L0000007 VOLUME 383520.396 3743783.951 7.07 LOCATION L0000008 VOLUME 383530.394 3743783.726 7.09 LOCATION L0000009 VOLUME 383540.391 3743783.500 7.12 LOCATION L0000010 VOLUME 383550.389 3743783.274 7.13 LOCATION L0000011 VOLUME 383560.386 3743783.049 7.12 LOCATION L0000012 VOLUME 383570.384 3743782.823 7.11 LOCATION L0000013 VOLUME 383580.381 3743782.597 7.10 LOCATION L0000014 VOLUME 383590.378 3743782.372 7.10 LOCATION L0000015 VOLUME 383600.376 3743782.146 7.08 LOCATION L0000016 VOLUME 383610.373 3743781.920 7.04 LOCATION L0000017 VOLUME 383620.371 3743781.695 7.00 LOCATION L0000018 VOLUME 383630.368 3743781.469 6.97 LOCATION L0000019 VOLUME 383640.366 3743781.243 6.93 LOCATION L0000020 VOLUME 383650.363 3743781.017 6.89 LOCATION L0000021 VOLUME 383660.361 3743780.792 6.82 LOCATION L0000022 VOLUME 383670.358 3743780.566 6.76 LOCATION L0000023 VOLUME 383680.355 3743780.340 6.66 LOCATION L0000024 VOLUME 383690.353 3743780.115 6.54 LOCATION L0000025 VOLUME 383700.350 3743779.889 6.41 LOCATION L0000026 VOLUME 383710.348 3743779.663 6.28 LOCATION L0000027 VOLUME 383720.345 3743779.438 6.15 LOC
ATION L0000028 VOLUME 383730.343 3743779.212 6.04 LOCATION L0000029 VOLUME 383740.340 3743778.986 5.96 LOCATION L0000030 VOLUME 383750.338 3743778.760 5.89 LOCATION L0000031 VOLUME 383760.335 3743778.535 5.90 LOCATION L0000032 VOLUME 383770.333 3743778.309 5.91 LOCATION L0000033 VOLUME 383780.330 3743778.083 5.94 LOCATION L0000034 VOLUME 383790.327 3743777.858 6.01 LOCATION L0000035 VOLUME 383800.325 3743777.632 6.07 LOCATION L0000036 VOLUME 383810.322 3743777.406 6.26 LOCATION L0000037 VOLUME 383820.228 3743777.092 6.47 LOCATION L0000038 VOLUME 383820.079 3743767.093 6.60 LOCATION L0000039 VOLUME 383819.930 3743757.095 6.74 LOCATION L0000040 VOLUME 383819.781 3743747.096 6.92 LOCATION L0000041 VOLUME 383819.326 3743737.263 7.13 LOCATION L0000042 VOLUME 383811.005 3743731.716 7.22 LOCATION L0000043 VOLUME 383801.511 3743729.171 7.27 LOCATION L0000044 VOLUME 383791.635 3743727.600 7.17 LOCATION L0000045 VOLUME 383781.759 3743726.029 7.04 LOCATION L0000046 VOLUME 383771.883 3743724.458 6.90 LOCATION L0000047 VOLUME 383769.848 3743716.195 6.90 LOCATION L0000048 VOLUME 383769.848 3743706.195 6.91 LOCATION L0000049 VOLUME 383769.848 3743696.195 6.92 LOCATION L0000050 VOLUME 383768.657 3743687.386 6.85 LOCATION L0000051 VOLUME 383758.657 3743687.386 6.78 LOCATION L0000052 VOLUME 383748.657 3743687.386 6.72 LOCATION L0000053 VOLUME 383738.657 3743687.386 6.71 LOCATION L0000054 VOLUME 383728.657 3743687.386 6.71 LOCATION L0000055 VOLUME 383718.657 3743687.386 6.71 LOCATION L0000056 VOLUME 383708.657 3743687.386 6.72 LOCATION L0000057 VOLUME 383698.657 3743687.386 6.73 LOCATION L0000058 VOLUME 383688.657 3743687.386 6.78 LOCATION L0000059 VOLUME 383678.657 3743687.386 6.85 LOCATION L0000060 VOLUME 383668.657 3743687.386 6.95 LOCATION L0000061 VOLUME 383658.657 3743687.386 7.13 LOCATION L0000062 VOLUME 383648.657 3743687.386 7.31 LOCATION L0000063 VOLUME 383638.657 3743687.386 7.37 LOCATION L0000064 VOLUME 383634.299 3743692.840 7.37 LOCATION L0000065 VOLUME 383634.634 3743702.835 7.37 LOCATION L0000066 VOLUME 383634.970 3743712.829 7.37 LOCATION L0000067 VOLUME 383635.305 3743722.823 7.38 LOCATION L0000068 VOLUME 383635.641 3743732.818 7.37 LOCATION L0000069 VOLUME 383635.977 3743742.812 7.35 LOCATION L0000070 VOLUME 383636.312 3743752.807 7.34 LOCATION L0000071 VOLUME 383636.648 3743762.801 7.23 LOCATION L0000072 VOLUME 383642.769 3743766.661 7.15 LOCATION L0000073 VOLUME 383652.766 3743766.411 7.09 LOCATION L0000074 VOLUME 383662.763 3743766.162 7.01 LOCATION L0000075 VOLUME 383672.760 3743765.912 6.93 LOCATION L0000076 VOLUME 383682.757 3743765.663 6.83 LOCATION L0000077 VOLUME 383692.754 3743765.413 6.72 LOC
ATION L0000078 VOLUME 383702.751 3743765.164 6.61 LOCATION L0000079 VOLUME 383712.748 3743764.914 6.48 LOCATION L0000080 VOLUME 383722.744 3743764.665 6.35 LOCATION L0000081 VOLUME 383732.741 3743764.415 6.30 LOCATION L0000082 VOLUME 383742.738 3743764.166 6.26 LOCATION L0000083 VOLUME 383752.735 3743763.916 6.24 LOCATION L0000084 VOLUME 383762.732 3743763.667 6.27 LOCATION L0000085 VOLUME 383772.729 3743763.417 6.29 LOCATION L0000086 VOLUME 383782.726 3743763.168 6.29 LOCATION L0000087 VOLUME 383792.723 3743762.918 6.28 LOCATION L0000088 VOLUME 383802.720 3743762.669 6.28 LOCATION L0000089 VOLUME 383803.041 3743752.982 6.43 LOCATION L0000090 VOLUME 383802.338 3743743.582 6.76 LOCATION L0000091 VOLUME 383792.463 3743742.007 6.77 LOCATION L0000092 VOLUME 383782.587 3743740.431 6.77 LOCATION L0000093 VOLUME 383772.712 3743738.856 6.73 LOCATION L0000094 VOLUME 383762.837 3743737.281 6.65 LOCATION L0000095 VOLUME 383754.765 3743734.194 6.59 LOCATION L0000096 VOLUME 383754.937 3743724.196 6.65 LOCATION L0000097 VOLUME 383755.110 3743714.197 6.73 LOCATION L0000098 VOLUME 383755.282 3743704.199 6.81 LOCATION L0000099 VOLUME 383747.915 3743701.590 6.81 LOCATION L0000100 VOLUME 383737.915 3743701.562 6.85 LOCATION L0000101 VOLUME 383727.915 3743701.534 6.89 LOCATION L0000102 VOLUME 383717.915 3743701.507 6.90 LOCATION L0000103 VOLUME 383707.915 3743701.479 6.89 LOCATION L0000104 VOLUME 383697.915 3743701.451 6.88 LOCATION L0000105 VOLUME 383687.915 3743701.423 6.94 LOCATION L0000106 VOLUME 383677.916 3743701.395 7.00 LOCATION L0000107 VOLUME 383667.916 3743701.367 7.07 LOCATION L0000108 VOLUME 383657.916 3743701.339 7.17 LOCATION L0000109 VOLUME 383648.945 3743702.332 7.26 LOCATION L0000110 VOLUME 383649.061 3743712.331 7.27 LOCATION L0000111 VOLUME 383649.178 3743722.331 7.27 LOCATION L0000112 VOLUME 383649.294 3743732.330 7.27 LOCATION L0000113 VOLUME 383649.410 3743742.329 7.28 LOCATION L0000114 VOLUME 383649.566 3743752.287 7.28 LOCATION L0000115 VOLUME 383659.563 3743752.017 7.19 LOCATION L0000116 VOLUME 383669.559 3743751.747 7.09 LOCATION L0000117 VOLUME 383670.789 3743743.622 7.08 LOCATION L0000118 VOLUME 383669.966 3743733.655 7.10 LOCATION L0000119 VOLUME 383669.142 3743723.689 7.11 LOCATION L0000120 VOLUME 383670.613 3743715.864 7.08 LOCATION L0000121 VOLUME 383680.612 3743715.996 7.00 LOCATION L0000122 VOLUME 383690.611 3743716.127 6.93 LOCATION L0000123 VOLUME 383691.179 3743725.726 6.92 LOCATION L0000124 VOLUME 383691.349 3743735.724 6.91 LOCATION L0000125 VOLUME 383691.518 3743745.723 6.89 LOCATION L0000126 VOLUME 383696.223 3743750.893 6.84 LOCATION L0000127 VOLUME 383706.213 3743750.439 6.74 LOC
ATION L0000128 VOLUME 383711.212 3743745.175 6.72 LOCATION L0000129 VOLUME 383711.298 3743735.175 6.79 LOCATION L0000130 VOLUME 383711.383 3743725.176 6.86 LOCATION L0000131 VOLUME 383711.829 3743715.540 6.88 LOCATION L0000132 VOLUME 383721.829 3743715.540 6.89 LOCATION L0000133 VOLUME 383731.829 3743715.540 6.83 LOCATION L0000134 VOLUME 383733.981 3743723.077 6.78 LOCATION L0000135 VOLUME 383733.578 3743733.069 6.69 LOCATION L0000136 VOLUME 383733.175 3743743.061 6.59 LOCATION L0000137 VOLUME 383733.569 3743752.298 6.50 LOCATION L0000138 VOLUME 383743.568 3743752.429 6.48 LOCATION L0000139 VOLUME 383753.567 3743752.560 6.47 LOCATION L0000140 VOLUME 383763.566 3743752.691 6.51 LOCATION L0000141 VOLUME 383773.565 3743752.821 6.55 ** End of LINE VOLUME Source ID = SLINE1
** Source Parameters **
** LINE VOLUME Source ID = SLINE1
SRCPARAM L0000001 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000002 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000003 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000004 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000005 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000006 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000007 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000008 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000009 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000010 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000011 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000012 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000013 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000014 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000015 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000016 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000017 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000018 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000019 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000020 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000021 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000022 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000023 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000024 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000025 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000026 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000027 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000028 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000029 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000030 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000031 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000032 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000033 0.0070921986 5.00 4.65 4.65 SRC
PARAM L0000034 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000035 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000036 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000037 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000038 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000039 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000040 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000041 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000042 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000043 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000044 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000045 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000046 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000047 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000048 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000049 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000050 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000051 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000052 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000053 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000054 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000055 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000056 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000057 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000058 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000059 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000060 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000061 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000062 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000063 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000064 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000065 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000066 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000067 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000068 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000069 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000070 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000071 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000072 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000073 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000074 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000075 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000076 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000077 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000078 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000079 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000080 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000081 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000082 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000083 0.0070921986 5.00 4.65 4.65 SRC
PARAM L0000084 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000085 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000086 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000087 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000088 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000089 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000090 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000091 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000092 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000093 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000094 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000095 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000096 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000097 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000098 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000099 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000100 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000101 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000102 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000103 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000104 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000105 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000106 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000107 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000108 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000109 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000110 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000111 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000112 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000113 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000114 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000115 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000116 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000117 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000118 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000119 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000120 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000121 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000122 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000123 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000124 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000125 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000126 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000127 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000128 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000129 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000130 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000131 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000132 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000133 0.0070921986 5.00 4.65 4.65 SRC
PARAM L0000134 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000135 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000136 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000137 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000138 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000139 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000140 0.0070921986 5.00 4.65 4.65 SRCPARAM L0000141 0.0070921986 5.00 4.65 4.65 ** ---------------------------------------------------------------------

URBANSRC ALL

SRCGROUP ALL

SO FINISHED
**
****************************************
** AERMOD Receptor Pathway
****************************************
**
**

RE STARTING
INCLUDED "Carson Calas Park Stormwater Capture.rou"

RE FINISHED
**
****************************************
** AERMOD Meteorology Pathway
****************************************
**
**

ME STARTING
SURFFILE klgb_sfc_pfl\KLGB_V11_trimmed.sfc
PROFFILE klgb_sfc_pfl\KLGB_V11_trimmed.PFL
SURFDATA 23129 2015 Long_Beach/Daughtery_Field/Airport
UAIRDATA 3190 2015
PROFBASE 9.65 METERS

ME FINISHED
**
****************************************
** AERMOD Output Pathway
****************************************
**
**

OU STARTING
RECTABLE ALLAVE 1ST
RECTABLE 1 1ST
** Auto-Generated Plotfiles
PLOTFILE 1 ALL 1ST "Carson Calas Park Stormwater Capture.AD\01H1GALL.PLT" 31 PLOTFILE PERIOD ALL "Carson Calas Park Stormwater Capture.AD\PE00GALL.PLT" 32 SUMMFILE "Carson Calas Park Stormwater Capture.sum"

OU FINISHED
***
Message Summary For AERMOD Model Setup ***
--------- Summary of Total Messages --------

A Total of 0 Fatal Error Message(s)
A Total of 2 Warning Message(s)
A Total of 0 Informational Message(s)

******** FATAL ERROR MESSAGES ********
*** NONE ***

******** WARNING MESSAGES ********
ME W186 382 MEOPEN: THRESH_1MIN 1-min ASOS wind speed threshold used

0.50 ME W187 382 MEOPEN: ADJ_U* Option for Stable Low Winds used in AERMET

***********************************
*** SETUP Finishes Successfully ***
***********************************
*** AERMOD - VERSION 24142 *** *** C:\Users\anoll\OneDrive - Dudek\Desktop\HARP2\Carson Calas Park Stor *** 06/25/25 *** AERMET - VERSION 22112 *** ***
*** 15:40:32

PAGE 1
*** MODELOPTs: RegDFAULT CONC ELEV URBAN ADJ_U*
*** MODEL SETUP OPTIONS SUMMARY
***
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
** Model Options Selected:
* Model Uses Regulatory DEFAULT Options
* Model Is Setup For Calculation of Average CONCentration Values. * NO GAS DEPOSITION Data Provided.
* NO PARTICLE DEPOSITION Data Provided.
* Model Uses NO DRY DEPLETION. DDPLETE = F
* Model Uses NO WET DEPLETION. WETDPLT = F
* Stack-tip Downwash.
* Model Accounts for ELEVated Terrain Effects.
* Use Calms Processing Routine.
* Use Missing Data Processing Routine.
* No Exponential Decay.
* Model Uses URBAN Dispersion Algorithm for the SBL for 141 Source(s),

for Total of 1 Urban Area(s):

Urban Population = 9663345.0 ; Urban Roughness Length = 1.000 m * Urban Roughness Length of 1.0 Meter Used.
* ADJ_U* - Use ADJ_U* option for SBL in AERMET
* CCVR_Sub - Meteorological data includes CCVR substitutions * TEMP_Sub - Meteorological data includes TEMP substitutions * Model Assumes No FLAGPOLE Receptor Heights.
* The User Specified a Pollutant Type of: PM_10

**Model Calculates 1 Short Term Average(s) of: 1-HR
and Calculates PERIOD Averages

**This Run Includes: 141 Source(s); 1 Source Group(s); and 2229 Receptor(s)
with: 0 POINT(s), including
0 POINTCAP(s) and 0 POINTHOR(s)
and: 141 VOLUME source(s)
and: 0 AREA type source(s)
and: 0 LINE source(s)
and: 0 RLINE/RLINEXT source(s)
and: 0 OPENPIT source(s)
and: 0 BUOYANT LINE source(s) with a total of 0 line(s) and: 0 SWPOINT source(s)

**Model Set To Continue RUNning After the Setup Testing. **The AERMET Input Meteorological Data Version Date: 22112

**Output Options Selected:

Model Outputs Tables of PERIOD Averages by Receptor
Model Outputs Tables of Highest Short Term Values by Receptor (RECTABLE Keyword)
Model Outputs External File(s) of High Values for Plotting (PLOTFILE Keyword)
Model Outputs Separate Summary File of High Ranked Values (SUMMFILE Keyword)

**NOTE: The Following Flags May Appear Following CONC Values: c for Calm Hours m for Missing Hours
b for Both Calm and
Missing Hours

**Misc. Inputs: Base Elev. for Pot. Temp. Profile (m MSL) = 9.65 ; Decay Coef. = 0.000 ; Rot. Angle = 0.0
Emission Units = GRAMS/SEC ; Emission Rate Unit Factor = 0.10000E+07
Output Units = MICROGRAMS/M**3

**App
roximate Storage Requirements of Model = 3.8 MB of RAM.

**Input Runstream File: aermod.inp

**Output Print File: aermod.out

**Detailed Error/Message File: Carson Calas Park Stormwater Capture.err

**File for Summary of Results: Carson Calas Park Stormwater Capture.sum

*** AERMOD - VERSION 24142 *** *** C:\Users\anoll\OneDrive - Dudek\Desktop\HARP2\Carson Calas Park Stor *** 06/25/25 *** AERMET - VERSION 22112 *** ***
*** 15:40:32

PAGE 2
*** MODELOPTs: RegDFAULT CONC ELEV URBAN ADJ_U*
*** VOLUME SOURCE DATA ***
NUMBER EMISSION RATE BASE RELEASE INIT.

INIT. URBAN EMISSION RATE AIRCRAFT
SOURCE PART. (GRAMS/SEC) X Y ELEV. HEIGHT SY

SZ SOURCE SCALAR VARY
ID CATS. (METERS) (METERS) (METERS) (METERS) (METERS) (METERS) BY
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
L0000001 0 0.70922E-02 383465.8 3743790.6 7.0 5.00 4.65

4.65 YES NO
L0000002 0 0.70922E-02 383470.4 3743785.1 7.0 5.00 4.65

4.65 YES NO
L0000003 0 0.70922E-02 383480.4 3743784.9 7.0 5.00 4.65

4.65 YES NO
L0000004 0 0.70922E-02 383490.4 3743784.6 7.0 5.00 4.65

4.65 YES NO
L0000005 0 0.70922E-02 383500.4 3743784.4 7.0 5.00 4.65

4.65 YES NO
L0000006 0 0.70922E-02 383510.4 3743784.2 7.0 5.00 4.65

4.65 YES NO
L0000007 0 0.70922E-02 383520.4 3743784.0 7.1 5.00 4.65

4.65 YES NO
L0000008 0 0.70922E-02 383530.4 3743783.7 7.1 5.00 4.65

4.65 YES NO
L0000009 0 0.70922E-02 383540.4 3743783.5 7.1 5.00 4.65

4.65 YES NO
L0000
010 0 0.70922E-02 383550.4 3743783.3 7.1 5.00 4.65

4.65 YES NO
L0000011 0 0.70922E-02 383560.4 3743783.0 7.1 5.00 4.65

4.65 YES NO
L0000012 0 0.70922E-02 383570.4 3743782.8 7.1 5.00 4.65

4.65 YES NO
L0000013 0 0.70922E-02 383580.4 3743782.6 7.1 5.00 4.65

4.65 YES NO
L0000014 0 0.70922E-02 383590.4 3743782.4 7.1 5.00 4.65

4.65 YES NO
L0000015 0 0.70922E-02 383600.4 3743782.1 7.1 5.00 4.65

4.65 YES NO
L0000016 0 0.70922E-02 383610.4 3743781.9 7.0 5.00 4.65

4.65 YES NO
L0000017 0 0.70922E-02 383620.4 3743781.7 7.0 5.00 4.65

4.65 YES NO
L0000018 0 0.70922E-02 383630.4 3743781.5 7.0 5.00 4.65

4.65 YES NO
L0000019 0 0.70922E-02 383640.4 3743781.2 6.9 5.00 4.65

4.65 YES NO
L0000020 0 0.70922E-02 383650.4 3743781.0 6.9 5.00 4.65

4.65 YES NO
L0000021 0 0.70922E-02 383660.4 3743780.8 6.8 5.00 4.65

4.65 YES NO
L0000022 0 0.70922E-02 383670.4 3743780.6 6.8 5.00 4.65

4.65 YES NO
L0000023 0 0.70922E-02 383680.4 3743780.3 6.7 5.00 4.65

4.65 YES NO
L0000024 0 0.70922E-02 383690.4 3743780.1 6.5 5.00 4.65

4.65 YES NO
L0000025 0 0.70922E-02 383700.3 3743779.9 6.4 5.00 4.65

4.65 YES NO
L0000026 0 0.70922E-02 383710.3 3743779.7 6.3 5.00 4.65

4.65 YES NO
L0000027 0 0.70922E-02 383720.3 3743779.4 6.1 5.00 4.65

4.65 YES NO
L0000028 0 0.70922E-02 383730.3 3743779.2 6.0 5.00 4.65

4.65 YES NO
L0000029 0 0.70922E-02 383740.3 3743779.0 6.0 5.00 4.65

4.65 YES NO
L0000030 0 0.70922E-02 383750.3 3743778.8 5.9 5.00 4.65

4.65 YES NO
L0000031 0 0.70922E-02 383760.3 3743778.5 5.9 5.00 4.65

4.65 YES NO
L0000032 0 0.70922E-02 383770.3 3743778.3 5.9 5.00 4.65

4.65 YES NO
L0000033 0 0.70922E-02 383780.3 3743778.1 5.9 5.00 4.65

4.65 YES NO
L0000034 0 0.70922E-02 383790.3 3743777.9 6.0 5.00 4.65

4.65 YES NO
L0000
035 0 0.70922E-02 383800.3 3743777.6 6.1 5.00 4.65

4.65 YES NO
L0000036 0 0.70922E-02 383810.3 3743777.4 6.3 5.00 4.65

4.65 YES NO
L0000037 0 0.70922E-02 383820.2 3743777.1 6.5 5.00 4.65

4.65 YES NO
L0000038 0 0.70922E-02 383820.1 3743767.1 6.6 5.00 4.65

4.65 YES NO
L0000039 0 0.70922E-02 383819.9 3743757.1 6.7 5.00 4.65

4.65 YES NO
L0000040 0 0.70922E-02 383819.8 3743747.1 6.9 5.00 4.65

4.65 YES NO
*** AERMOD - VERSION 24142 *** *** C:\Users\anoll\OneDrive - Dudek\Desktop\HARP2\Carson Calas Park Stor *** 06/25/25 *** AERMET - VERSION 22112 *** ***
*** 15:40:32

PAGE 3
*** MODELOPTs: RegDFAULT CONC ELEV URBAN ADJ_U*
*** VOLUME SOURCE DATA ***
NUMBER EMISSION RATE BASE RELEASE INIT.

INIT. URBAN EMISSION RATE AIRCRAFT
SOURCE PART. (GRAMS/SEC) X Y ELEV. HEIGHT SY

SZ SOURCE SCALAR VARY
ID CATS. (METERS) (METERS) (METERS) (METERS) (METERS) (METERS) BY
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
L0000041 0 0.70922E-02 383819.3 3743737.3 7.1 5.00 4.65

4.65 YES NO
L0000042 0 0.70922E-02 383811.0 3743731.7 7.2 5.00 4.65

4.65 YES NO
L0000043 0 0.70922E-02 383801.5 3743729.2 7.3 5.00 4.65

4.65 YES NO
L0000044 0 0.70922E-02 383791.6 3743727.6 7.2 5.00 4.65

4.65 YES NO
L0000045 0 0.70922E-02 383781.8 3743726.0 7.0 5.00 4.65

4.65 YES NO
L0000046 0 0.70922E-02 383771.9 3743724.5 6.9 5.00 4.65

4.65 YES NO
L0000047 0 0.70922E-02 383769.8 3743716.2 6.9 5.00 4.65

4.65 YES NO
L0000048 0 0.70922E-02 383769.8 3743706.2 6.9 5.00 4.65

4.65 YES NO
L0000049 0 0.70922E-02 383769.8 3743696.2 6.9 5.00 4.65

4.65 YES NO
L0000050 0 0.70922E-02 383768.7 3743687.4 6.8 5.00 4.65

4.65 YES NO
L0000051 0 0.70922E-02 383758.7 3743687.4 6.8 5.00 4.65

4.65 YES NO
L0000052 0 0.70922E-02 383748.7 3743687.4 6.7 5.00 4.65

4.65 YES NO
L0000053 0 0.70922E-02 383738.7 3743687.4 6.7 5.00 4.65

4.65 YES NO
L0000054 0 0.70922E-02 383728.7 3743687.4 6.7 5.00 4.65

4.65 YES NO
L0000055 0 0.70922E-02 383718.7 3743687.4 6.7 5.00 4.65

4.65 YES NO
L0000056 0 0.70922E-02 383708.7 3743687.4 6.7 5.00 4.65

4.65 YES NO
L0000057 0 0.70922E-02 383698.7 3743687.4 6.7 5.00 4.65

4.65 YES NO
L0000058 0 0.70922E-02 383688.7 3743687.4 6.8 5.00 4.65

4.65 YES NO
L0000059 0 0.70922E-02 383678.7 3743687.4 6.8 5.00 4.65

4.65 YES NO
L0000060 0 0.70922E-02 383668.7 3743687.4 7.0 5.00 4.65

4.65 YES NO
L0000061 0 0.70922E-02 383658.7 3743687.4 7.1 5.00 4.65

4.65 YES NO
L0000062 0 0.70922E-02 383648.7 3743687.4 7.3 5.00 4.65

4.65 YES NO
L0000063 0 0.70922E-02 383638.7 3743687.4 7.4 5.00 4.65

4.65 YES NO
L0000064 0 0.70922E-02 383634.3 3743692.8 7.4 5.00 4.65

4.65 YES NO
L0000065 0 0.70922E-02 383634.6 3743702.8 7.4 5.00 4.65

4.65 YES NO
L0000066 0 0.70922E-02 383635.0 3743712.8 7.4 5.00 4.65

4.65 YES NO
L0000067 0 0.70922E-02 383635.3 3743722.8 7.4 5.00 4.65

4.65 YES NO
L0000068 0 0.70922E-02 383635.6 3743732.8 7.4 5.00 4.65

4.65 YES NO
L0000069 0 0.70922E-02 383636.0 3743742.8 7.3 5.00 4.65

4.65 YES NO
L0000070 0 0.70922E-02 383636.3 3743752.8 7.3 5.00 4.65

4.65 YES NO
L0000071 0 0.70922E-02 383636.6 3743762.8 7.2 5.00 4.65

4.65 YES NO
L0000072 0 0.70922E-02 383642.8 3743766.7 7.1 5.00 4.65

4.65 YES NO
L0000073 0 0.70922E-02 383652.8 3743766.4 7.1 5.00 4.65

4.65 YES NO
L0000074 0 0.70922E-02 383662.8 3743766.2 7.0 5.00 4.65

4.65 YES NO
L0000075 0 0.70922E-02 383672.8 3743765.9 6.9 5.00 4.65

4.65 YES NO
L0000076 0 0.70922E-02 383682.8 3743765.7 6.8 5.00 4.65

4.65 YES NO
L0000077 0 0.70922E-02 383692.8 3743765.4 6.7 5.00 4.65

4.65 YES NO
L0000078 0 0.70922E-02 383702.8 3743765.2 6.6 5.00 4.65

4.65 YES NO
L0000079 0 0.70922E-02 383712.7 3743764.9 6.5 5.00 4.65

4.65 YES NO
L0000080 0 0.70922E-02 383722.7 3743764.7 6.3 5.00 4.65

4.65 YES NO
*** AERMOD - VERSION 24142 *** *** C:\Users\anoll\OneDrive - Dudek\Desktop\HARP2\Carson Calas Park Stor *** 06/25/25 *** AERMET - VERSION 22112 *** ***
*** 15:40:32

PAGE 4
*** MODELOPTs: RegDFAULT CONC ELEV URBAN ADJ_U*
*** VOLUME SOURCE DATA ***
NUMBER EMISSION RATE BASE RELEASE INIT.

INIT. URBAN EMISSION RATE AIRCRAFT
SOURCE PART. (GRAMS/SEC) X Y ELEV. HEIGHT SY

SZ SOURCE SCALAR VARY
ID CATS. (METERS) (METERS) (METERS) (METERS) (METERS) (METERS) BY
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
L0000081 0 0.70922E-02 383732.7 3743764.4 6.3 5.00 4.65

4.65 YES NO
L0000082 0 0.70922E-02 383742.7 3743764.2 6.3 5.00 4.65

4.65 YES NO
L0000083 0 0.70922E-02 383752.7 3743763.9 6.2 5.00 4.65

4.65 YES NO
L0000084 0 0.70922E-02 383762.7 3743763.7 6.3 5.00 4.65

4.65 YES NO
L0000085 0 0.70922E-02 383772.7 3743763.4 6.3 5.00 4.65

4.65 YES NO
L0000086 0 0.70922E-02 383782.7 3743763.2 6.3 5.00 4.65

4.65 YES NO
L0000087 0 0.70922E-02 383792.7 3743762.9 6.3 5.00 4.65

4.65 YES NO
L0000088 0 0.70922E-02 383802.7 3743762.7 6.3 5.00 4.65

4.65 YES NO
L0000
089 0 0.70922E-02 383803.0 3743753.0 6.4 5.00 4.65

4.65 YES NO
L0000090 0 0.70922E-02 383802.3 3743743.6 6.8 5.00 4.65

4.65 YES NO
L0000091 0 0.70922E-02 383792.5 3743742.0 6.8 5.00 4.65

4.65 YES NO
L0000092 0 0.70922E-02 383782.6 3743740.4 6.8 5.00 4.65

4.65 YES NO
L0000093 0 0.70922E-02 383772.7 3743738.9 6.7 5.00 4.65

4.65 YES NO
L0000094 0 0.70922E-02 383762.8 3743737.3 6.6 5.00 4.65

4.65 YES NO
L0000095 0 0.70922E-02 383754.8 3743734.2 6.6 5.00 4.65

4.65 YES NO
L0000096 0 0.70922E-02 383754.9 3743724.2 6.6 5.00 4.65

4.65 YES NO
L0000097 0 0.70922E-02 383755.1 3743714.2 6.7 5.00 4.65

4.65 YES NO
L0000098 0 0.70922E-02 383755.3 3743704.2 6.8 5.00 4.65

4.65 YES NO
L0000099 0 0.70922E-02 383747.9 3743701.6 6.8 5.00 4.65

4.65 YES NO
L0000100 0 0.70922E-02 383737.9 3743701.6 6.8 5.00 4.65

4.65 YES NO
L0000101 0 0.70922E-02 383727.9 3743701.5 6.9 5.00 4.65

4.65 YES NO
L0000102 0 0.70922E-02 383717.9 3743701.5 6.9 5.00 4.65

4.65 YES NO
L0000103 0 0.70922E-02 383707.9 3743701.5 6.9 5.00 4.65

4.65 YES NO
L0000104 0 0.70922E-02 383697.9 3743701.5 6.9 5.00 4.65

4.65 YES NO
L0000105 0 0.70922E-02 383687.9 3743701.4 6.9 5.00 4.65

4.65 YES NO
L0000106 0 0.70922E-02 383677.9 3743701.4 7.0 5.00 4.65

4.65 YES NO
L0000107 0 0.70922E-02 383667.9 3743701.4 7.1 5.00 4.65

4.65 YES NO
L0000108 0 0.70922E-02 383657.9 3743701.3 7.2 5.00 4.65

4.65 YES NO
L0000109 0 0.70922E-02 383648.9 3743702.3 7.3 5.00 4.65

4.65 YES NO
L0000110 0 0.70922E-02 383649.1 3743712.3 7.3 5.00 4.65

4.65 YES NO
L0000111 0 0.70922E-02 383649.2 3743722.3 7.3 5.00 4.65

4.65 YES NO
L0000112 0 0.70922E-02 383649.3 3743732.3 7.3 5.00 4.65

4.65 YES NO
L0000113 0 0.70922E-02 383649.4 3743742.3 7.3 5.00 4.65

4.65 YES NO
L0000
114 0 0.70922E-02 383649.6 3743752.3 7.3 5.00 4.65

4.65 YES NO
L0000115 0 0.70922E-02 383659.6 3743752.0 7.2 5.00 4.65

4.65 YES NO
L0000116 0 0.70922E-02 383669.6 3743751.7 7.1 5.00 4.65

4.65 YES NO
L0000117 0 0.70922E-02 383670.8 3743743.6 7.1 5.00 4.65

4.65 YES NO
L0000118 0 0.70922E-02 383670.0 3743733.7 7.1 5.00 4.65

4.65 YES NO
L0000119 0 0.70922E-02 383669.1 3743723.7 7.1 5.00 4.65

4.65 YES NO
L0000120 0 0.70922E-02 383670.6 3743715.9 7.1 5.00 4.65

4.65 YES NO
*** AERMOD - VERSION 24142 *** *** C:\Users\anoll\OneDrive - Dudek\Desktop\HARP2\Carson Calas Park Stor *** 06/25/25 *** AERMET - VERSION 22112 *** ***
*** 15:40:32

PAGE 5
*** MODELOPTs: RegDFAULT CONC ELEV URBAN ADJ_U*
*** VOLUME SOURCE DATA ***
NUMBER EMISSION RATE BASE RELEASE INIT.

INIT. URBAN EMISSION RATE AIRCRAFT
SOURCE PART. (GRAMS/SEC) X Y ELEV. HEIGHT SY

SZ SOURCE SCALAR VARY
ID CATS. (METERS) (METERS) (METERS) (METERS) (METERS) (METERS) BY
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
L0000121 0 0.70922E-02 383680.6 3743716.0 7.0 5.00 4.65

4.65 YES NO
L0000122 0 0.70922E-02 383690.6 3743716.1 6.9 5.00 4.65

4.65 YES NO
L0000123 0 0.70922E-02 383691.2 3743725.7 6.9 5.00 4.65

4.65 YES NO
L0000124 0 0.70922E-02 383691.3 3743735.7 6.9 5.00 4.65

4.65 YES NO
L0000125 0 0.70922E-02 383691.5 3743745.7 6.9 5.00 4.65

4.65 YES NO
L0000126 0 0.70922E-02 383696.2 3743750.9 6.8 5.00 4.65

4.65 YES NO
L0000127 0 0.70922E-02 383706.2 3743750.4 6.7 5.00 4.65

4.65 YES NO
L0000128 0 0.70922E-02 383711.2 3743745.2 6.7 5.00 4.65