Agenda packet — Fontana City Council, June 23, 2026 (part 3 of 6)

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AGREEMENT REGARDING THE TRANSFER OF RECYCLED WATER

RECHARGED BY THE INLAND EMPIRE UTILITIES AGENCY FOR

THE CITY OF FONTANA AND TRANSFERED TO

THE FONTANA WATER COMPANY

This AGREEMENT REGARDING THE TRANSFER OF RECYCLED WATER

RECHARGED BY THE INLAND EMPIRE UTILITIES AGENCY FOR THE CITY OF FONTANA (“Agreement”) is entered into as of the _____ day o f ________, 2026 by and between the CITY OF FONTANA (“City”) and FONTANA WATER COMPANY (“Company”) for the transfer of City’s right of first purchase of recycled water recharged to the Chino Basin by the Inland Empire Utilities Agency (“IEUA”).

WHEREAS , the supply of water to the Chino Basin (“Basin”) region is limited, and it is in the best interest of water and wastewater agencies in the Basin to maximize the reuse and recharge of recycled water where appropriate to low er the cost of Basin replenishment, which lowered cost is shared by water producers and custo mers as the cost of water is a direct pass through for the Company; and

WHEREAS , City does not operate a water delivery system for domestic water;

WHEREAS , Company operates a domestic water delivery system and has the means to put the City’s recycled recharged water to beneficial use;

WHEREAS , City is a Contracting Agency as defined in the “R egional Sewage Service Contract” dated November 1, 2023, as may be amended from time to time, (“Regional Contract”) that transmits wastewater to IEUA’s Regional Sewerage System for treatment;

WHEREAS , Regional Contract Section 15.B.1 provides “Each C ontracting Agency shall have the right of first purchase from IEUA of Recycled Water in a total quantity not exceeding the base entitlement of the Contracting Agency.”;

WHEREAS , City, as a Contracting Agency, has the right of f irst purchase from IEUA recycled water in a total quantity not exceeding the City’s base entitlement;

WHEREAS , City of Ontario (“Ontario”) and City are parties to a Right of First Purchase of Recharged Reclaimed Water Agreement dated January 1 5, 2008 as amended March 18, 2014, and June 13, 2017, and as may be amended from time to time, (the “Ontario Agreement”) where Ontario has the right of first purchase of up to 3, 000 acre-feet (“AF”) per year of City’s base entitlement of recycled water that is recharged in the Basin;

WHEREAS, City may on an annual basis transfer any rights whi ch Ontario elects not to claim pursuant to Section 4(b) of the Ontario Agreement;

WHEREAS , this Agreement does not pertain to direct use of recycled water and does not intend to amend, alter, or modify the Agreement for Regionalized Recycled Water Service dated April 26, 2011, by and between City and Company;

WHEREAS , IEUA plans to implement a water reuse program kno wn as the Chino Basin Program (CBP) to advance treated recycled water and inject it into the Chino Basin for future production; and

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WHEREAS , the City is willing to transfer a portion of the City’s recycled water base entitlement to Company; and

NOW, THEREFORE , for good and valuable consideration the receipt a nd sufficiency of which is hereby acknowledged, and for the mutual covenants contained herein, the parties agree as follows:

I. TRANSFER OF RIGHT FIRST PURCHASE OF TREATED EFFLUENT

For the period beginning with fiscal year 2025/26 and continuing for the remainder of the term of this Agreement, and subject to the terms an d conditions contained herein and in the Regional Contract, the City hereby assigns and transfers to the Company: (a) all of the City’s right of first purchase of the City’s base entitlement (as that term is defined under Section 15.B.1 of the Regional Contract) in excess of 3,000 AF per fiscal year recharged into the Basin by IEUA on behalf of the City; and (b) that portion of City’s right of first purchase which Ontario elects to not claim pursuant to Section 4 of the Ontario Agreemen t, if any, ((a) and (b) collectively the “Transferred Right”).

II. ACCEPTANCE OF TRANSFER

Company hereby accepts the foregoing transfer, agre es to take and pay for the Transferred recycled water and assumes and agrees t o perform and be bound by all of the covenants, agreements, provisions, conditions, and obligations of City arising from or under the Regional Contract but only as they relate to and to the extent of Company’s exercise of the rights transferred to it under this Agreement.

III. PURCHASE PRICE; PAYMENT

As consideration for the City’s agreement to grant Company the Transferred Right, under Section 1 of this Agreement, Company will incur and will pay all approved IEUA costs associated with Company’s Transferred Right under Section 2 of this Agreement. This payment includes, but is not limited to the following:

a. On an annual basis Company will pay all charges attributable to transferred water acquired by Company at current fiscal year IEUA recharge rat e per acre foot established by IEUA in accordance with the Regional Contract. For fiscal y ear 2025/26 the IEUA recharge rate is $714.85/AF

b. Company will timely pay amounts due under Sectio n III.a directly to IEUA. Company will promptly provide the City with copies of invoices received from IEUA and proof of payment of the invoices within thirty (30) days of such payment.

i. Company agrees to defend, indemnify, and hold ha rmless the City, the City’s directors, officers, and employees from any claims, damage, liability, or costs (including reasonable attorney’s fees and legal cos ts) arising out of or in any way related to Company’s failure to timely pay IEUA amounts due under this Section III.

c. In addition to the payment to be made by Company directly to IEUA as set forth above, on an annual basis Company will also pay City a fixed 5% of the current fiscal year IEUA 426

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recharge rate per acre foot established by IEUA for the Transferred Rights from City to Company under Section I of this Agreement. For fiscal year 2025/26 the rate is ($714.85/AF x 5%) or $35.74 per-acre-foot.

Payment shall be made by Company to City each year for the amount of recharged recycled water transferred to Company purchased during the previous fiscal year. Prior to issuance of an invoice, Company shall provide to City, to the attention of the City Engineering/Public Works Department, an IEUA report showing the total amount of recycled water recharged transferred to Company during the previous fiscal year. This report shall be provided by Company to City no later than thirty (30) days after receipt of IEUA invoice. Upon receipt and verification of such information, City shall issue an invoice to Company no later than thirty (30) days after receiving IEUA report for the amount due. Company shall initiate the payment to City within thirty (30) days of the date of City’s invoice, by mailing a check for the full amount due. Any payment not received by City within thirty (30) days from the due date will incur a late payment penalty of 10% of the total amount due from Company to City. If payment is not received by City within ninety (90) days after City gives Company written notice as provided in Section XIII that payment is delinquent, then City will have the option to terminate this agreement pursuant to Section VII of this Agreement.

d. The Parties agree that annual price adjustments may be necessary due to changes in the IEUA rate, changes in the market, or for other reasons. If a price adjustment is requested by either party, the Parties will meet and confer regarding the price adjustment. If the Parties are unable to agree on a new price within sixty (60) days from th e date of the request for a price adjustment, this Agreement may be terminated in accordance with Section VII of this Agreement.

IV. TERM

This Agreement will be for a term of five (5) conse cutive fiscal years which terminate at the end of fiscal year 2031/32 or upon the completion and implementation of the CBP, whichever occurs first (“Termination Date”) unless otherwise terminated by either party in accordance with Section VII below.

V. NO OBLIGATION TO DELIVER SPECIFIED AMOUNT OF WASTEWATER TO IEUA

The parties agree that the City is under no obligat ion to deliver any minimum amount of wastewater to any IEUA Regional Plant for treatment and recharge purposes.

VI. DELIVERY

Company will be solely responsible for development and maintenance of facilities necessary for Company to exercise the Transferred Right and take delivery of the water from the Basin pursuant to this Agreement.

VII. TERMINATION

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This Agreement may be terminated by either party, at its sole discretion, with or without cause, or for no cause, by giving thirty (30) days’ notice to the other party. If this Agreement is terminated all the rights and obligations of the Parties set forth herein will be of no further force and effect. If the Agreement is terminated due to convenience and Company has not exercised the Transferred Right but issued a payment for the same, the Company may request reimbursement of the prepaid payment.

VIII. INDEMNIFICATION

City and Company each agree, to the fullest extent permitted by law, to indemnify and hold the other party, and its directors, officers, employees, or authorized volunteers harmless from any claims, damage, liability, or cost (including attorneys’ fees and costs of defense) in connection with or in any way related to the parties’ performance of rights and obligation under this Agreement, including such negligent acts, errors, or omissions by sub-contractors or others for whom the indemnifying party is legally liable; provided, however, that this indemnity will not apply to the gross negligence or willful misconduct of a party. This provision will survive the termination of this Agreement.

IX. AUTHORITY

Each signatory of this Agreement represents hereby that he or she has the authority to execute and deliver the same on behalf of the party hereto for which such signatory is acting.

X. GOVERNING LAW; VENUE

This Agreement will be interpreted and enforced in accordance with the laws of the State of California without regard to principles of conflicts of laws. Any action to enforce or interpret this Agreement will be filed and litigated exclusively in the Superior Court of San Bernardino County, California or in the Federal District Court for the Central District of California.

XI. ENTIRE AGREEMENT; AMENDMENT

This Agreement constitutes the entire agreement among the parties with respect to the subject matter hereof and supersedes all prior written and oral agreements with respect to the matters covered by this Agreement. This Agreement may not be amended except by an instrument in writing signed by each of the parties hereto.

XII. ATTORNEYS’ FEES

In the event of any litigation pertaining to this Agreement, the losing party shall pay the prevailing party’s costs and expenses, including without limitation, reasonable attorneys’ fees.

XIII. RECORDATION

City will cause this Agreement to be recorded in the Official Records of San Bernardino County and will promptly provide conformed copies of the recorded Agreement to the Company and IEUA as required under the Regional Contract.

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XIV. NOTICES

Whenever any notice is required or permitted to be given under the terms of this Agreement, the same will be given in writing, and sent by: (a) certified mail, return receipt requested, postage prepaid; (b) a national overnight delivery service, delivery prepaid; (c) hand delivery with written receipt acknowledged; or (d) e-mail, followed by a copy sent in accordance with this Section XIII sent the same day as the e-mail, in each case to the address (together with a contemporaneous copy to each copied addressee), as applicable, set forth below. Any notice required or given hereunder will be deemed received the same Business Day if sent by hand delivery or e-mail, the next Business Day if sent by overnight courier, or three (3) days after posting if sent by certified mail, return receipt requested; provided that, any notice received after 6:00 p.m. Pacific Time on any Business Day or received on any day that is not a Business Day will be deemed to have been received on the following Business Day. Further, all notices given pursuant to this Agreement will be deemed effective if executed and sent by counsel for City or Company, as applicable. Any party can change their addresses and contact information by written notice to the other parties hereunder.

To City: City of Fontana
8353 Sierra Avenue
Fontana, CA 92335
Attn: _________________________
Email: _________________________

To Company: Fontana Water Company
15966 Arrow Route
Fontana, CA 92335
Attn: Water Resources
Email: _________________________

With Copy to: San Gabriel Valley Water Company
P.O. Box 6010
El Monte, CA 92734-2010
Attn: General Counsel
Email: _________________________

XV. NO ASSIGNMENT

Neither party may assign any right under this Agreement to a third party without the prior written consent of the other party.

XVI. CAPTIONS; INTERPRETATION

The section headings used herein are solely for convenience and will not be used to interpret this Agreement. The parties acknowledge that this Agreement is the product of negotiation and compromise on the part of the parties, and the parties agree, that since they have participated in the negotiation and drafting of this Agreement, this Agreement will not be construed as if prepared by one of the parties, but rather according to its fair meaning as a whole, as if all Parties had prepared it.

XVII. SEVERABILITY
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If any term, provision, condition or covenant of this Agreement or its application to any party or circumstances will be held by a court of competent jurisdiction, to any extent, invalid or unenforceable, the remainder of this Agreement, or the application of the term, provision, condition, or covenant to persons or circumstances other than those as to whom or which it is held invalid or unenforceable, will not be affected, and will be valid and enforceable to the fullest extent permitted by law unless the rights and obligations of the parties have been materially altered or abridged thereby.

XVIII. COUNTERPARTS

This Agreement may be executed in counterparts, each of which will, irrespective of the date of its execution and delivery, be deemed an original, and the counterparts together will constitute one and the same instrument.

XIX. RECITALS INCORPORATED

The above Recitals are true and correct and are incorporated into this Agreement as though fully set forth herein.

XX. TIME OF THE ESSENCE

Time is of the essence in the execution and performance of this Agreement.

[SIGNATURES ON THE FOLLOWING PAGE]

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SIGNATURE PAGE
TO

AGREEMENT REGARDING THE TRANSFER OF RECHARGED RECYCLED WATER

CITY OF FONTANA,
a California municipal corporation
By: ________________________________
Matthew C. Ballantyne
City Manager

FONTANA WATER COMPANY,
a California corporation
By:_________________________________
_________________________________
Attest:

By: _______________________________
Germaine Key, City Clerk
Approved as to form:

Best Best & Krieger LLP
City Attorney
By: _______________________________
Phillip Burum, Deputy City Manager
Development Services Organization
By: _______________________________
Gia Kim
Public Works Director/City Engineer

IN COMPLIANCE WITH INSURANCE ADMINISTRATION POLICIES/PROCEDURES By: ______________________________
Rakesha Thomas, Director of
Human Resources and Risk Management
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ACKNOWLEDGEMENT

STATE OF CALIFORNIA )
)

COUNTY OF )

On _______________ before me,
__________________________________________________, Notary Public, personally appeared ________________________________________________, who proved to me on the basis of satisfactory evidence to be the person(s) whose name(s) is/are subscribed to the within instrument and acknowledged to me that he/she/they executed the same in his/her/their authorized capacity(ies), and that by his/her/their signature(s) on the instrument the person(s), or the entity upon behalf of which the person(s) acted, executed the instrument.

I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

Signature ________________________ (Seal)

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ACKNOWLEDGEMENT

STATE OF CALIFORNIA )
)

COUNTY OF )

I certify under PENALTY OF PERJURY under the laws of the State of California that the foregoing paragraph is true and correct.

WITNESS my hand and official seal.

Signature ________________________ (Seal)

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City of Fontana
Action Report
City Council Meeting
8437 Sierra Avenue
Fontana, CA 92335
File #: 26-1092 Agenda Date: 6/23/2026
Agenda #: S. Category: Consent Calendar
FROM:

Engineering
SUBJECT:

Acceptance of Final Parcel Map No. 20910 for the Development of a 595 Multi-Family Unit Project on the Southwest Corner of Citrus Avenue and Summit Avenue, and the Abandonment of Easements on Said Map
RECOMMENDATION:

1. Approve Final Parcel Map No. 20910 for the development on the southwest corner of Citrus Avenue and Summit Avenue.

2. Accept dedication of public streets and easements.

3. Authorize the Mayor and City Clerk to certify the abandonment of the street right-of-way easements for portions of Joe Avenue and Edward Avenue as shown on the parcel map.

COUNCIL GOALS:
· To invest in the City’s infrastructure (streets, sewers, parks, etc.) by maintaining and improving the city's existing infrastructure.
· To invest in the City’s infrastructure (streets, sewers, parks, etc.) by providing for the development of new infrastructure.

DISCUSSION:

On November 4, 2025, the City of Fontana Planning Commission approved Vesting Tentative Parcel Map No. 24-0019 (TPM No. 20910) to consolidate twenty-nine (29) parcels into four (4) parcels and approved DRP No. 24-0030 for a multi-family development consisting of 595 units and associated site improvements on approximately 27 acres.

As part of this Parcel Map, portions of Joe Avenue and Edward Avenue are no longer needed and will be vacated and abandoned. Pursuant to Sections 66434(g) and 66499.20.2 of the Subdivision Map Act, the City Clerk must certify the abandonment of these portions of street right-of-way easements.

The filing of this Parcel Map shall constitute an abandonment of the portions of the right-of-way easements previously granted to the City of Fontana for street and public utility purposes.

The subdivider, BCT Dev Acquisition Co. LLC, has complied with the Conditions of Approval and dedicated the required right-of-way easements as part of the project. The Parcel Map has been reviewed by the City Engineer and found to be substantially in conformance with the approved Vesting Tentative Parcel Map (TPM No. 20910).

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File #: 26-1092 Agenda Date: 6/23/2026
Agenda #: S. Category: Consent Calendar
FISCAL IMPACT:

This action will only approve the Parcel Map for recordation and authorize permits for the construction of the development, therefore, there is no fiscal impact to City resources at this time.

MOTION:

Approve staff recommendation.

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VICINITY MAP
N.T.S.
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EASEMENT ABANDONMENT EXHIBIT
LEGEND:

AREA OF ABANDONMENT
N.A.P.

APN:110808238/
110808239

SUMMIT AVENUE

CITRUS AVENUE
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City of Fontana
Action Report
City Council Meeting
8437 Sierra Avenue
Fontana, CA 92335
File #: 26-1095 Agenda Date: 6/23/2026
Agenda #: T. Category: Consent Calendar
FROM:

City Clerk
SUBJECT:

Appointment to Fill Vacancy on the Planning Commission (Term Ending December 9, 2026) RECOMMENDATION:

It is recommended that the City Council confirm the appointment of Commissioner Gilbert Roldan to the Planning Commission to fill the remainder of the unexpired term ending December 9, 2026.

COUNCIL GOALS:
· Create and maintain a dynamic team by promoting stability and predictability by providing consistent policy direction.
· Create and maintain a dynamic team by communicating Goals and Objectives to all commissions and employees.
· Create and maintain a dynamic team by ensuring commissions work within clear guidelines to achieve Council goals.

DISCUSSION:

On June 9, 2026, the City Council made an acting appointment of Commissioner Gilbert Roldan to the Planning Commission following the resignation of Commissioner Idilio Sanchez. This action was taken pursuant to Government Code § 54974(b) to ensure the Commission maintained its ability to conduct business while the required vacancy posting period was initiated.

In accordance with Government Code § 54974, a Notice of Vacancy was posted on June 4, 2026, to satisfy the required 10-working-day posting period prior to final Council action.

The acting appointment allowed the Commission to continue operating without interruption during the statutory notice period. The required posting period has now elapsed, and the City Council may take final action to confirm the appointment.

Commissioner Gilbert Roldan has been serving in the acting capacity since June 9, 2026, and is eligible for appointment to complete the remainder of the unexpired term.

FISCAL IMPACT:

None.

MOTION:

Approve staff’s recommendation.

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City of Fontana
Action Report
City Council Meeting
8437 Sierra Avenue
Fontana, CA 92335
File #: 26-1027 Agenda Date: 6/23/2026
Agenda #: A. Category: Public Hearing
FROM:

Planning Department
SUBJECT:

Appeal No. 26-0001: Request to overturn the Planning Commission’s March 17, 2026 decision adopting a Categorical Exemption per Section 15332 (Class No. 32) and approving Tentative Parcel Map No. 18-000005 (TPM No. 19950), and Design Review No. 18-000010 - a request to split one (1) parcel into two (2) and for site and architectural approval for the development of two (2) new industrial commerce center buildings of 41,218 square feet and 30,767 square feet with associated site improvements on 3.98 acres located north of Hilton Drive and west of Hemlock Avenue, and identified as Assessor Parcel Numbers 1110-151-03.

RECOMMENDATION:

Deny Appeal No. 26-0001, thereby upholding the Planning Commission’s decision on March 17, 2026, approving, pursuant to a categorical exemption under California Environmental Quality Act (CEQA) Section No. 15332 (Class No. 32. Infill Development), Tentative Parcel Map No. 18-000005 (TPM No. 19950) and Design Review No. 18-000010 to split one (1) parcel into two (2) and for site and architectural approval for the development of two (2) new industrial commerce center buildings of 41,218 square feet and 30,767 square feet, with associated site improvements, on 3.98 acres located north of Hilton Drive and west of Hemlock Avenue, and identified as Assessor Parcel Numbers 1110- 151-03.

COUNCIL GOALS:
· Promote economic development by concentrating on job creation. · Promote economic development by establishing a quick, consistent development process. · Promote economic development by being business friendly at all levels and striving to constantly improve the city's competitiveness.

APPELLANT / APPEAL APPLICANT:

Appeal No. 26-0001: Supporters Alliance for Environmental Responsibility, 1939 Harrison Street, Suite No. 150, Oakland, CA 94612.

DISCUSSION:

At its March 17, 2026 meeting, the Planning Commission approved Tentative Parcel Map No. 18- 000005 (TPM No. 19950) and Design Review No. 18-000010, pursuant to a Categorical Exemption under CEQA Section 15332 (Class No. 32), with adoption of Resolution PC Number 2026-006 on a 5 -0 vote. The pertinent staff report and attachments for the March 17, 2026 Planning Commission hearing, along with meeting minutes, are included as part of Attachments No. 5 and 6.

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File #: 26-1027 Agenda Date: 6/23/2026
Agenda #: A. Category: Public Hearing
On March 25, 2026, the City received Appeal No. 25-0002 from Supporters Alliance for Environmental Responsibility. In summary, the appellant contends that the decision to approve the project should not be upheld because the project does not qualify for a Class 32 Categorical Exemption under CEQA. The appeal letter requests that the City rescind the Project approvals, conduct an initial study, and prepare either a mitigated negative declaration or environmental impact report to analyze and mitigate the Project’s environmental impacts. No evidence supporting the appellant’s position was provided in the letter.

The project environmental consultant (Lilburn Corporation), who prepared the original CEQA Class No. 32 (In-Fill Development) Categorical Exemption Memorandum (Attachment No. 4) for the Hilton Industrial Commerce Center Project, prepared a written response (Attachment No. 3) to the applicant’s letter explaining that substantial evidence supports the City’s determination that the categorical exemption from CEQA was appropriate.

On May 11, 2026, the City received a follow-up comment letter (Attachment No. 5) from the appellant in response to Lilburn Corporation’sresponse letter. The comment letter dated May 11, 2026, stated that the decision to approve the project should not be upheld because the project does not qualify for a Class 32 Categorical Exemption under CEQA. The appellant stated that the Project site provides substantial habitat for multiple species, that the Categorical Exemption memo did not analyze the Project’ssignificant adverse impacts on wildlife and that mitigation measures are needed to reduce the Project’simpacts on wildlife. The letter requested that the City Council find that the Project does not qualify for the Exemption and instead prepare a mitigated negative declaration or environmental impact report before project approval.

On May 12, 2026, at its regularly scheduled meeting, the City Council opened the public hearing for the appeal and continued the item to the June 23, 2026 City Council meeting.

Lilburn corporation has also prepared a written response to the May 11, 2026 letter (Attachment No. 6). The response explains that the Categorical Exemption Justification and supporting analyses meets all the criteria for an Infill Exemption and that no significant impacts that could be mitigated to levels of less than significant were identified.

FISCAL IMPACT:

None.

MOTION:

Approve staff’s recommendation.

ATTACHMENTS:

Attachment No. 1 - Vicinity Map
Attachment No. 2 - Appellant Letter - Lozeau Drury/Supporters Alliance for Environmental Responsibility, March 25, 2026
Attachment No. 3 - Environmental Consultant Response Letter, April 14, 2026 Attachment No. 4 - Justification Memorandum for the Categorical Exemption Attachment No. 5 - Appellant Letter - Lozeau Drury/Supporters Alliance for Environmental Responsibility, May 11, 2026
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File #: 26-1027 Agenda Date: 6/23/2026
Agenda #: A. Category: Public Hearing
Attachment No. 6 - Environmental Consultant Response Letter, May 22, 2026 Attachment No. 7 - Planning Commission March 17, 2026, Report Attachment No. 8 - Planning Commission Minutes of March 17, 2026 Attachment No. 9 - Clerk of the Board Fee Receipt and NOE Attachment No. 10 - Public Hearing Notice
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CITY OF FONTANA PLANNING DEPARTMENT

VICINITY MAP
DATE: May 12, 2026

CASE: Master Case No. 18-000053
Appeal No. 26-0001
ATTACHMENT NO. 1
Hilton Drive
Hemlock Avenue
Redwood Avenue
Foothill Blvd
Project Site
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VIA ACCELA PORTAL

March 25, 2026

Germaine Key, City Clerk
Fontana City Clerk’s Office
8353 Sierra Avenue
Fontana, CA 92335
[email protected]

Patty Nevins, Director
Fontana Planning Department
8353 Sierra Avenue
Fontana, CA 92335
[email protected]
[email protected]
Salvador Quintanilla, Senior Planner
Fontana Planning Department
8353 Sierra Avenue
Fontana, CA 92335
[email protected]

Re: Appeal of March 17, 2026 Planning Commission Decision Approving CEQA Class 32 Categorical Exemption for the Hilton Industrial Facility Project (Master Case No. 18-000053; Tentative Parcel Map No. 18-000005 (TPM No. 19950); Design Review No. 18-000010)

Dear City Clerk Key, Director Nevins, and Planner Quintanilla:

I am writing on behalf of Supporters Alliance for Environmental Responsibility (“SAFER”) regarding the Hilton Industrial Facility Project (Master Case No. 18-000053; Tentative Parcel Map No. 18-000005 (TPM No. 19950); Design Review No. 18-000010) (“Project”), which proposes the development of two industrial commerce center facilities totaling 71,985 square feet, located north of Hilton Drive and west of Hemlock Avenue, in the City of Fontana (“City”). With this letter, SAFER appeals to the Fontana City Council the Planning Commission’s March 17, 2026 decision to approve the Hilton Industrial Facility based on a California Environmental Quality Act (“CEQA”) Class 32 Categorical Exemption for the Project.

The Planning Commission’s March 17, 2026, decision to approve the Project should not be upheld because the Project does not qualify for a Class 32 Categorical Exemption under CEQA. SAFER therefore respectfully requests that the City rescind the Project approvals, conduct an initial study, and prepare either a mitigated negative declaration or environmental impact report to analyze and mitigate the Project’s environmental impacts.

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Appeal of Hilton Industrial Facility Project and Class 32 Categorical Exemption March 25 2026

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Sincerely,

Rebecca Davis
Lozeau Drury LLP
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1905 Business Center Drive ● San Bernardino ● CA 92408 ● 909-890-1818 ● Fax 909-890-1809

April 14, 2026

Mr. Salvador Quintanilla
City of Fontana
8353 Sierra Avenue
Fontana CA 92335

SUBJECT: Response to SAFER Appeal Letter for Master Case No. 18 -000053 (Hilton Industrial Facility)

Dear Salvador:

This letter has been prepared per the City’s request for Lilburn Corporation to provide a response to the March 25, 2026 appeal letter from Lozeau Drury LLP ’s requesting the Planning Commission’s denial of the project. SAFER requests that the City prepare an Initial Study to analyze and mitigate the Project’s environmental impacts.

The CE Justification analysis documents that the Project is exempt from the California Environmental Quality Act (CEQA) under the Class 32 Categorical Exemption (CE) set forth in CEQA Guidelines Section 15332. The Justification Memorandum in the City’s files for the Project, provides an introduction, project description, and evaluation of the Project’s consistency with the requirements for a Class 32 CE. The Memorandum further evaluates whether any of the exceptions to categorical exemptions set forth in CEQA Guidelines Section 15300.2 apply to the Project.

CEQA Guidelines Section 15332 states that a Class 32 CE applies when:

a) The project is consistent with the applicable general plan designation and all applicable general plan policies as well as with applicable zoning designation and regulations.
b) The proposed development occurs within city limits on a project site of no more than five acres substantially surrounded by urban uses.
c) The project site has no value as habitat for endangered, rare or threatened species. d) Approval of the project would not result in any significant effects relating to traffic, noise, air quality, or water quality.
e) The site can be adequately served by all required utilities and public services.

As documented in the CE Justification, the Project is an allowable use under the City of Fontana General Plan (General Plan) land use designation of Light Industrial (I-L) and is zoned as West End Specific Plan (BP3). According to the General Plan, business parks, research and 470
Mr. Salvador Quintanilla
March 16, 2026

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development, technology centers, corporate and support office uses, clean industry, supporting retail uses, truck and equipment sales and related services are allowed. Warehouses that are designed in ways that limit off-site impacts are also permitted. The Proposed Project therefore has been evaluated as such in the General Plan EIR.

The Project Site is surrounded by a Target warehouse to the north, Vision Communications and Open Door Solutions to the east, Southern California Edison to the west, and a Service Partners, a building supply warehouse to the south. Surrounding uses predominantly consist of industrial uses.

The land uses and zoning designations surrounding the Project Site are as follows:

North: Uses to the north are designated Light Industrial (L-I) and zoned West End Specific Plan (BP3).

East: Uses to the east are designated Light Industrial (L-I) and zoned West End Specific Plan (BP3).

South: Uses to the south are designated Light Industrial (L-I) and zoned West End Specific Plan (BP3).

West: Uses to the west are designated Light Industrial (L-I) and zoned West End Specific Plan (BP3).

The analyses prepared for the subject project concludes that the Project meets all criteria shown above to qualify for an Infill Exemption and no significant impacts that could not be mitigated to levels of less than significant were identified . Based on the CE Justification Memo as well as expert review of the Proposed Project, substantial evidence supports the City’s determination that the Project is categorically exemption under CEQA Guidelines section 15332.

If you should have any questions or require additional information, please do not hesitate to give us a call.

Sincerely,

Cheryl A. Tubbs
Vice President
471
16498.00432\44298126.1
CEQA Class 32
Categorical Exemption Memorandum

To: City of Fontana Planning Department

From: Cheryl Tubbs, Lilburn Corporation

Date: February 3, 2026

Subject: Hilton Drive Warehouse Development – CEQA Class 32 Categorical Exemption Memorandum

This memorandum presents an environmental analysis for the proposed development of two warehouse buildings totaling 71,985 square‐feet (41,218 SF Building 1 & 30,767 SF Building 2) (“Proposed Project”), located along the north side of Hilton Drive between Redwood Avenue and Hemlock Avenue. An Application for the Proposed Project has been submitted to the City of Fontana by Hilton Drive LLC. The intent of this analysis is to document whether the Project is exempt from the California Environmental Quality Act (CEQA) under the Class 32 Categorical Exemption (CE) set forth in CEQA Guidelines Section 15332 . This memorandum provides an introduction, project description, and evaluation of the Project’s consistency with the requirements for a Class 32 CE. This memorandum further evaluates whether any of the exceptions to categorical exemptions set forth in CEQA Guidelines Section 15300.2 apply to the Project.

CEQA Guidelines Section 15332 states that a Class 32 CE applies when:

a) The project is consistent with the applicable general plan designation and all applicable general plan policies as well as with applicable zoning designation and regulations. b) The proposed development occurs within city limits on a project site of no more than five acres substantially surrounded by urban uses.
c) The project site has no value as habitat for endangered, rare or threatened species. d) Approval of the project would not result in any significant effects relating to traffic, noise, air quality, or water quality.
e) The site can be adequately served by all required utilities and public services.

CEQA Guidelines Section 15300.2 lists the following exceptions to categorical exemptions:

a) Location. Classes 3, 4, 5, 6, and 11 are qualified by consideration of where the project is to be located – a project that is ordinarily insignificant in its impact on the environment may in a particularly sensitive environment be significant. Therefore, these classes are considered to apply all instances, except where the project may impact on an environmental resource of hazardous or critical concern where designated, precisely mapped, and officially adopted pursuant to law by federal, state, or local agencies.
b) Cumulative Impact. All exemptions for these classes are inapplicable when the cumulative impact of successive projects of the same type in the same place, over time is significant.
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c) Significant Effect. A categorical exemption shall not be used for an activity where there is a reasonable possibility that the activity will have a significant effect on the environment due to unusual circumstances.
d) Scenic Highways. A categorical exemption shall not be used for a project which may result in damage to scenic resources, including but not limited to, trees, historic buildings, rock outcroppings, or similar resources, within a highway officially designated as a state scenic highway. This does not apply to improvements which are required as mitigation by an adopted negative declaration or certified EIR. e) Hazardous Waste Sites. A categorical exemption shall not be used for a project located on a site which is included on any list compiled pursuant to Section 65962.5 of the Government Code.
f) Historical Resources. A categorical exemption shall not be used for a project which may cause a substantial adverse change in the significance of a historical resource.

PROJECT LOCATION AND SETTING

The City of Fontana (City) is located in the southwestern portion of San Bernardino County. The City is bordered by the San Gabriel Mountain Range to the north, Rialto and Bloomington to the east, Jurupa Valley to the south, and Rancho Cucamonga and Ontari o to the west. Regional access is available via Interstate 210 (I-210), which traverses the City in an east-west orientation, and Interstate-15 (I-15), which runs along the City’s northwest border; refer to Figure 1, Regional Vicinity.

The approximately 4.0-acre Project Site is located in the western portion of the City. Specifically, the Project Site is located along the north side of Hilton Drive between Redwood Avenue and Hemlock Avenue in the City of Fontana, San Bernardino County. Refer to Figure 2, Site Vicinity.

Access to the site is provided along southern frontage of the Project Site with driveways on east and west at Hilton Drive; refer to Figure 3, Site Plan.

EXISTING CONDITIONS

The Project Site is currently vacant and generally flat. Ruderal vegetation and tree stumps occur on-site. The Project Site is surrounded by industrial uses.

The Project Site has a City of Fontana General Plan (General Plan) land use designation of Light Industrial (I-L) and is zoned as West End Specific Plan (BP3).1 According to the General Plan, business parks, research and development, technology centers, corporate and support office uses, clean industry, supporting retail uses, truck and equipment sales and related services are allowed. Warehouses that are designed in ways that limit off-site impacts are also permitted.2

1 City of Fontana, City of Fontana General Plan Land Use Map , https://www.fontanaca.gov/DocumentCenter/View/44297, accessed July 18,2025. 2 City of Fontana, Fontana Forward General Plan Update 2015-2035, November 13, 2018. 473

LILBURNC O R P O R A T I O N
FIGURE 1

HILTON DRIVE WAREHOUSE DEVELOPMENT
City of Fontana, CaliforniaMile
10 PROJECT SITE

REGIONAL VICINITY
LILBURNCORPORATION 474

LILBURNC O R P O R A T I O N
FIGURE 2

HILTON DRIVE WAREHOUSE DEVELOPMENT
City of Fontana, CaliforniaMile
20 PROJECT SITE
W Lugonia A
ve

VICINITY MAP
Vanilla Bean Ln
Redw
ood A
ve
Hilton Drive
`

LILBURNCORPORATION
475

LILBURNCORPORATION

HILTON DRIVE WAREHOUSE DEVELOPMENT
City of Fontana, California
FIGURE 3

SITE PLAN
476
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The land uses and zoning designations surrounding the Project Site are as follows:

• North: Uses to the north are designated Light Industrial (L-I) and zoned West End Specific Plan(BP3).
• East: Uses to the east are designated Light Industrial (L-I) and zoned West End Specific Plan(BP3).
• South: Uses to the south are designated Light Industrial (L-I) and zoned West End Specific Plan(BP3).
• West: Uses to the west are designated Light Industrial (L-I) and zoned West End Specific Plan(BP3).

PROJECT DESCRIPTION

The Proposed Project is the development of two warehouse buildings totaling 71,985 square‐feet (41,218 SF Building 1 & 30,767 SF Building 2) on an approximately 4.0-acre site in the western portion of the City of Fontana, located along the north side of Hilton Drive between Redwood Avenue and Hemlock Avenue. The Project Site is identified as Assessor’s Parcel Numbers 1110- 151-03.

The Proposed Project would include improvements such as landscaping, new curbs, sidewalks, gutters, driveways, and signage (refer to Figure 3, Site Plan ). Each building will include a 2,248 square-foot office areas. The trash enclosure s would be designed to comply with City requirements and consistent with the architecture of the proposed warehouses. The Proposed Project would provide nighttime lighting, and safety and security cameras . Vehicle ingress and egress access to the proposed warehouses would be from two driveways along Hilton Drive.

Construction is anticipated to occur for a duration of approximately 12 months and would comply with the City of Fontana Zoning and Development Code Noise standards, which limits demolition and construction to the hours of 7:00 AM to 6:00 PM on weekdays and 8:00 AM to 5:00 PM on Saturdays. Construction materials required for the project include an excavator, a grader, a tractor, a crane, a concrete saw, paving equipment, a roller, and a rough terrain forklift.

Architecture

The two warehouses would have a total building area of 71,985 square-feet and a maximum building height of 47.5 feet; refer to Figure 4, Elevations. As a result, the project would be consistent with the Light Industrial maximum building height of 75 feet. The architectural design of the buildings includes tilt-up concrete walls to be painted with colors shown on Figure 4, glass and black anodized aluminum on buildings’ outer surfaces.

477

LILBURNCORPORATION

HILTON DRIVE WAREHOUSE DEVELOPMENT
City of Fontana, California
FIGURE 4

ELEVATIONS
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Parking

The Proposed Project consists of approximately 56 parking spaces for warehouse building 1 and 48 parking spaces for warehouse building 2 (total of 104 spaces), which include electric vehicle and accessible parking stalls.

Landscaping

Landscaping for the Proposed Project consist of a total of 19,957 sf landscaped area along the perimeters of the Project Site and the building frontages , as well as in the parking areas as required by Municipal Code Section No. 9-71(e) (see Figure 3). The landscaped area will include various drought tolerant trees and shrubs.

CONSTRUCTION

The Project Site is currently vacant and does not require demolition. Construction is anticipated to occur for a duration of approximately 12 months and would comply with the City of Fontana Zoning and Development Code Noise standards, which limits demolition and construction to the hours of 7:00 AM to 6:00 PM on weekdays and 8:00 AM to 5:00 PM on Saturdays. Construction materials required for the project include an excavator, a grader, a tractor, a crane, a concrete saw, paving equipment, a roller, and a rough terrain forklift.

CLASS 32 EXEMPTION CRITERIA ANALYSIS

Criterion (a) The project is consistent with the applicable general plan designation and all applicable general plan policies as well as with applicable zoning designation and regulations.

General Plan Consistency

The Project Site has a City of Fontana General Plan (General Plan) land use designation of Light Industrial (L -I) and zoned as West End Specific Plan( BP3).3 According to the General Plan, business parks, research and development, technology centers, corporate and support office uses, clean industry, supporting retail uses, truck and equipment sales and related services are allowed. Off-site improvements include groundcover, sidewalks, and curbs. Therefore, the Proposed Project is considered allowed use and is consistent with the applicable general plan designation. Table 1, City of Fontana General Plan Project Consistency Analysis, evaluates the project’s consistency with applicable General Plan land use policies.

3 City of Fontana, Fontana Forward General Plan Update 2015-2035, November 13, 2018. 479
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Table 1
General Plan Land Use, Zoning, and Urban Design Element Project Consistency Analysis Applicable General Plan Land Use Goals and Policies Project Consistency Analysis Land Use Element
Goal: Fontana development patterns support high quality of life and economic prosperity.

Policy: Locate high -quality industrial uses where there is appropriate access to regional transportation routes where there is appropriate access to regional transportation routes.

Consistent. The Proposed Project consists of two warehouse buildings located approximately 2 miles from the I -15 and I - 210, which serve as regional transportation routes . As such, the Proposed Project is consistent with this Land Use Element policy.

Goal: High-quality job- producing industrial uses are concentrated in a few locations where there is easy access to regional transportation routes.

Maintain but do expand existing heavy land us e areas in proximity to one another and to services for industrial uses.

Consistent. The proposed project consists of two warehouse buildings that would be consistent with existing surrounding uses. The surrounding land uses are industrial. Therefore, the project is consistent with this Land Use Element policy.

Source: City of Fontana, Fontana Forward General Plan Update 2015 -2045, Land Use, Zoning, and Urban Design Element , updated July, 2023.

Zoning Code Consistency

The Project Site is zoned as West End (BP3) within the West End Specific Plan.4 According to the West End Specific Plan , the Project Site is identified as Rail Service Industrial ( BP3) which is designated development of rail served industrial uses and has the opportunity for direct rail service to the Southern Pacific Railroad is expected service primary large distribution type uses5 As a warehouse use, the Proposed Project is a permitted land use under the City of Fontana West End Specific Plan. The Project has been designed to comply with all applicable land use regulations and development standards set forth in the West End Specific Plan. To ensure compliance, the Project Site will be reviewed by the City’s Planning Division for consistency with applicable Specific Plan development standards. Development Standards include:

• Floor Area Ratio (FAR):

The floor area shall not exceed a floor area ratio of 0.4 multiplied by the net lot area. • Separation:

Any landscaped area shall be separated from adjacent vehicular areas by a wall or curb at least six (6) inches higher than the adjacent vehicular area. • Berming:

An earthen berm shall be provided beginning at the curb and extending a minimum of twenty-one (21) feet . All slopes facing streets shall be landscaped with turf and trees , except at sign locations where shrubs, turf, and ground cover are permitted. • Parking Lots and Service Areas Adjacent to Public Streets:

These areas shall be screened with shrubs planted on the building side of tree rows .

Screening shrubs shall be spaced no more than four (4) feet apart and shall be a minimum five-gallon size at planting.

4 City of Fontana, West End Specific Plan. April 1985. Revised March 15, 1994. 5 City of Fontana, West End Specific Plan. April 1985. Revised March 15, 1994. 480
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• Street/Parkway Trees:

Street tree planting shall consist of a double row of trees. Trees shall be fifteen-gallon size and planted five (5) feet from the curb or sidewalk line , except where located within a parkway.
• Setbacks:

Internal industrial buildings shall maintain a minimum setback of twenty (20) feet , with parking areas requiring a minimum setback of fifteen (15) feet. • Landscaping:

Landscaping shall consist of evergreen and/or deciduous trees, shrubs, and ground cover, and may also include public sidewalks. Landscaping shall comply with the following standards; Private Parcel Landscaping:
a) A fully automatic irrigation system shall be provided. b) All unpaved, non-work areas not used for parking or storage shall be landscaped with turf, ground cover, and trees.
• Signage:

Flashing or moving signs are not permitted. Freestanding signage shall not exceed 100 square feet in area or eight (8) feet in height . Roof -mounted signs and signs painted directly on walls or buildings are prohibited.
• Exterior Architectural Appearance:

1. Building Material Guidelines: Exterior walls for industrial buildings may be constructed of concrete, masonry, glass, or metal. Sheets or corrugated metal is not permitted. A maximum of three (3) colors per building is allowed.

2. Parking Structure Design: Parking structures shall be compatible with surrounding buildings.
• Screening Requirements:

1. Rooftop equipment screening
a. Architecturally compatible screening shall be provided to conceal all roof top materials and are subject to approval of the planning director. b. With nominally flat roof, the ridge line elevation shall not exceed the parapet elevation, except as approved by the planning commission. c. No part of the flat roof may project a bove parapet, except for antennas, satellite disk, elevator shafts, stairways and helicopter pads.

2. Refuse area screening: Trash container areas shall be screened from the streets and adjacent parcels with material to match building architecture

3. Screening along street frontages: An architecturally compatible screen shall be installed along all parking areas along street frontage

4. Any building exceeding thirty-five (35) feet in height shall be set back from exterior property boundaries by a distance equal to the building height

5. Landscape coverage for each site shall be determined by setback requirements. All areas not occupied by buildings, parking, or designated storage shall be landscaped. 481
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As analyzed above, the project is consistent with applicable General Plan designation and policies and zoning designation and regulations. Thus, the project would meet Criterion (a) requirements.

Criterion (b) The proposed development occurs within city limits on a project site of no more than five acres substantially surrounded by urban uses.

The Project Site is a 4.0-acre parcel located along the north side of Hilton Drive between Redwood Avenue and Hemlock Avenue , west of Sierra Avenue within the City of Fontana. As shown on Figure 2, the site is within an industrial area and adjacent to industrial uses.

The project location within the City and the size of the Project Site provide consistency with Criterial (b) requirements.

Criterion (c) The project site has no value as habitat for endangered, rare or threatened species.

A Biological Resources Assessment Letter Report dated September 2025, was prepared for the Proposed Project by Jennings Environmental LLC . (Jennings) (Appendix A). The findings are summarized herein.

Jennings conducted the general reconnaissance survey within the Project Site to identify the potential for the occurrence of special status species, vegetation communities, or habitats that could support special status wildlife species. The surveys were conducted on foot, throughout the Project Site on September 10, 2025.

No rare, State and/or federally -listed threatened or endangered species are documented/or expected to occur within the Project site. Additionally, no plant species with the CNPS California Rare Plant Rank (CRPR) of 1 or 2 were observed on -site or documented to occur on-site in the relevant databases. No other sensitive species were observed within the project area or buffer area.

The Project Site is highly disturbed. The habitat on-site is ruderal/disturbed vegetation with gravel surfaces. The site offers no suitable habitat for any rare sensitive species including listed species.

Therefore, no further surveys are required. Although the site is highly disturbed, there is some habitat within the Project site and adjacent area that is suitable for nesting birds in general. In general, the following condition of approval , in accordance with the Fontana General Plan Final Environmental Impact Report (August 10, 2018) Mitigation Measure BIO-3 and as recommended in the 2025 Biological Resources Assessment, nesting bird surveys shall be implemented prior to construction if construction occurs during the period of February 1 through September 15.

Mitigation Measure BIO -3 states that the City of Fontana shall require that all future project applicants prepare a Biological Assessment in conjunction with a project -level analysis and that the requirements of the Biological Assessment shall be a condition of approval of the individual development project.

Accordingly, the following shall be implemented prior to construction:

Prior to initial grading or clearing of areas of suitable habitat within the Planning Area (e.g., a vacant site with a landscape of grassland or low -growing, arid scrub vegetation or agricultural use or vegetation), a qualified biologist shall conduct a pre -construction 482
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survey, in accordance with the CDFG Staff Report on Burrowing Owl Mitigation, to determine the presence or absence of burrowing owl within the proposed area of impact.

Results of surveys, including mitigation recommendations (i.e. a Burrowing Owl Mitigation and Monitoring Report) shall be incorporated into the project -level CEQA compliance documentation.

Construction grading/clearing of areas of suitable habitat should occur between September 1 and January 31 to avoid impacts to breeding owls. If occupied burrows are discovered, they shall not be removed during nesting season [February 1 through August 31), unless a qualified biologist can determine that either the owls have not laid eggs or are incubating eggs, or that any young from the burrows are able to forage independently.

If initial grading is scheduled to occur during nesting season, the following measures shall be implemented.

If removal of occupied burrows is necessary, passive relocation outside of nesting season shall be implemented under the supervision of the qualified biologist. This shall include covering/excavation of burrows and installation of one-way doors as necessary. One-way doors will allow owls inside the burrow to exit but not allow them to re -enter. The biologist shall wait a minimum of one week before the burrow may be excavated to allow the owls time to leave the area.

The Project Site is located within the developed western area of the City and is mostly surrounded by urban land uses. There are no sensitive natural communities on the Project Site. No endangered, rare, or threatened species, as defined in CEQA Guidelines Section 15380, are expected to inhabit the site. The site is not within the designated critical habitat of any species.

As such, t he Project Site has no value as habitat for endangered, rare , or threatened species.

Thus, the Proposed Project would meet Criterion (c) requirements.

Criterion (d) Approval of the project would not result in any significant effects relating to traffic, noise, air quality, or water quality.

TRAFFIC

A Traffic Memorandum dated December 9 2025 , was prepared for the Proposed Project by Gandini Group, Inc. (Appendix B). The findings are summarized herein.

Trip Generation

As stated in the Traffic Memorandum, the Proposed Project is forecast to generate approximately 99 daily vehicle trips, including 9 vehicle trips during the AM peak hour and 11 vehicle trips during the PM peak hour which equates to approximately 150 daily PCE trips, including 13 PCE trips during the AM peak hour and 15 PCE trips during the PM peak hour.

Subject to verification by the City Traffic Engineer, the project does not appear to contribute to unique existing or proposed traffic conditions in the project vicinity to warrant further evaluation. 483
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Therefore, the project does not warrant the preparation of a transportation impact study with LOS analysis based on the City-established screening criteria and LOS impacts may be presumed to be negligible.

Vehicle Miles Traveled (VMT) Screening Criteria

The City TIA Guidelines identify screening criteria for certain types of projects that typically reduce VMT and may be presumed to result in a less than significant VMT impact. In accordance with the City’s project type screening, projects generating less than 500 daily vehicle trips may be presumed to have a less than significant VMT impact.

The Proposed Project satisfies the City -established vehicle miles traveled (VMT) screening criteria for projects generating less than 500 daily trip . The Proposed Project is forecast to generate approximately 99 daily vehicle trips, including 9 vehicle trips during the AM peak hour and 11 vehicle trips during the PM peak hour which equates to approximately 150 daily PCE trips, including 13 PCE trips during the AM peak hour and 15 PCE trips during the PM peak hour ..

Therefore, based on the City’s guidelines, the project would be screened out from a VMT analysis based on the daily trip thresholds and is anticipated to have a less than significant VMT impact.

NOISE

A Noise Impact Analysis, dated December 23, 2025, was prepared for the Proposed Project by Ganddini Group, Inc. (see Appendix C for report). The unit of measurement used to describe a noise level is the decibel (dB)
Construction Noise On-site

The City of Fontana has set restrictions to control noise impacts associated with the construction of the Proposed Project. According to Section 18-63 of the city’s Municipal Code, Construction or repairing of buildings or structures, construction activity is limited: between the hours of 7:00 a.m. and 6:00 p.m. on weekdays and between the hours of 8:00 a.m. and 5:00 p. m. on Saturdays except in the case of urgent necessity. Project construction noise levels are, therefore, considered exempt from municipal r egulation if activities occur within the hours specified in the City of Fontana Municipal Code, Section 18-63 of 7:00 a.m. to 6:00 p.m. on weekdays and between the hours of 8:00 a.m. to 5:00 p.m. on Saturdays. However, neither the General Plan nor the Municipal Code establish numeric maximum acceptable construction source noise levels at potentially affected receivers for CEQA analysis purposes. Therefore, a numerical construction threshold based on Federal Transit Administration (FTA) Transit Noise and Vib ration Impact Assessment Manual is used for analysis of daytime construction impacts, as discussed below. According to the FTA, local noise ordinances are typically not very useful in evaluating construction noise. They usually relate to nuisance and hours of allowed activity, and sometimes specify limits in terms of maximum levels, but are generally not practical for assessing the impact of a construction project.

Project construction noise criteria should account for the existing noise. the FTA considers a daytime exterior construction noise level of 80 dBA Leq(8-hour) for noise sensitive residential land uses, 85 dBA Leq(8 -hour) for commercial uses, and 90 dBA Leq(8 -hour) for industrial uses.

Construction noise would affect adjacent light industrial/warehouse land uses.

Project construction noise levels at nearby sensitive receptors were calculated using the FTA methodology. Modeled construction noise levels reach up to 70.7 dBA Leq at the property line shared with the industrial warehouse land use to the north, up to 68. 5 dBA Leq at the property 484
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line shared with the industrial land use to the south, and up to 77.9 dBA Leq at the industrial properties located to the east and west. Project construction noise levels will not exceed the FTA 90 dBA Leq (8-hour) construction noise standard for impacts to residential land uses. This impact would be less than significant.

Construction Noise Off-site

Project construction would generate up to 31 employee trips and 12 truck trips per day traveling to and from the project site via Hilton Avenue, Redwood Avenue and Hemlock Avenue to Foothill Boulevard where project trips would result in negligible increases in ambient noise levels. There are existing residential land uses along Redwood Avenue and Hemlock Avenue that would be exposed to these trips. Existing noise levels and existing plus project construction noise levels were calculated using FHWA methodology .

Operational Noise

The Proposed Project is considered an allowed use in accordance with the General Plan and West End Specific Plan standards, and the proposed warehouses are compatible with surrounding industrial developments. Noise generated by the Project would be consist ent with existing industrial noise levels and would occur within an established industrial area. As a result, anticipated warehouse-related noise would not exceed the City’s noise standards and would not introduce a new substantial noise source compared to existing conditions. Impacts would be less than significant.

AIR QUALITY

This analysis is based on the California Emissions Estimator Model (CalEEMod) version 2022 outputs (Appendix D).

Regulatory Requirements

The Project Site is located in the South Coast Air Basin (SCAB). The South Coast Air Quality Management District (SCAQMD) has jurisdiction over air quality issues and regulations within the SCAB. An evaluation of potential air quality impacts related to the Proposed Project (Warehouse Development) was prepared. The CalEEMod recommended by the SCAQMD for all general development projects within the SCAB was used to estimate project emissions.

Operational Emissions

As stated, based on the City of Fontana Traffic Engineering Division Traffic Impact Analysis (TIA) Guidelines for Vehicle Miles Traveled (VMT) and Level of Service (LOS) Assessment, dated October 2020, all truck trips were converted to passenger car equivalents (PCEs) using a 2.0 PCE factor for 2‐axle trucks, 2.5 for 3‐axle trucks, and 3.0 for 4‐ and more axle trucks. The Proposed 485
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Project is anticipated to generate 20 PCE trips in the a.m. peak hour, 23 PCE trips in the p.m. peak hour, and 195 daily PCE rips. The Proposed Project’s operation and construction emissions were screened using the California Emissions Estimator Model (CalEEMod) version 2022 prepared in collaboration with the SCAQMD (see Attachment B).

Construction Emissions

CalEEMod was utilized to estimate the on-site and off-site construction emissions. The emissions incorporate Rules 402 and 403 for fugitive dust by default as required during construction. The criteria pollutants screened for include reactive organic gases (ROG), nitrous oxides (NOx), carbon monoxide (CO), sulfur dioxide (SO 2), and fine and respirable particulates (PM 10 and PM2.5). Two of the analyzed pollutants, ROG and NO x, are ozone precursors. These criteria pollutants are key contributors to air qualit y degradation and can have potential significant environmental and public health impacts . Screening for these pollutants helps identify potential air quality impacts to protect public health, and comply with SCAQMD Thresholds.

Construction is anticipated to start late 2026 and end in late 2027. Construction and activities associated with the Proposed Project would have the potential to generate air emissions and toxic air contaminant emissions. The resulting emissions generated during construction and demolition of the Proposed Project are shown in Table 2 and Table 3 below which represent summer and winter conditions respectively.

Table 2
Maximum Summer Construction Emissions
(Pounds per Day)
Equipment ROG NOX CO SO2 PM10 PM2.5
2026 Max 1.2 10.4 15.4 0 0.9 0.5
SCAQMD Threshold 75 100 550 150 150 55
Significance No No No No No No
Source: CalEEMod 2022 Summer Construction Emissions.

Table 3
Maximum Winter Construction Emissions
(Pounds per Day)
Equipment ROG NOX CO SO2 PM10 PM2.5
2026 Max 3.2 29.2 29.8 0.1 9.1 5.1
2026 Max 38.0 10.0 15.0 0.0 0.9 0.4
SCAQMD Threshold 75 100 550 150 150 55
Significance No No No No No No
Source: CalEEMod 2022 Winter Construction Emissions.

Notes:

ROG = Reactive Organic Gases NOx = Nitrogen Oxides
CO = Carbon Monoxide SO2 = Sulfur Dioxides PM = Particulate Matter SCAQMD = South Coast Air Quality Management District

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As shown in Table 2 and 3, both summer and winter construction emissions are below SCAQMD thresholds. The Proposed Project does not exceed applicable SCAQMD regional thresholds during construction activities. Therefore, impacts are considered less than significant.

Operational Emissions

Operational emissions are categorized as energy (generation and distribution of energy to the end use), area (operational use of the project), and mobile (vehicle trips). Operational emissions were estimated using the CalEEMod version 2022 and are listed in Table 4 and 5, below.

Table 4
Summer Operational Emissions Summary
(Pounds Per Day)
Source ROG NOX CO SO2 PM10 PM2.5
Mobile 0 0 0 0 0 0
Area 2.3 0 3.2 0 0 0
Energy 0.1 0.9 0.7 0 0.1 0.1
Totals 2.4 0.9 3.9 0 0.1 0.1
SCAQMD Threshold 55 55 550 150 150 55
Significant No No No No No No
Source: CalEEMod 2022 Summer Emissions

Table 5
Winter Operational Emissions Summary
(Pounds Per Day)
Source ROG NOX CO SO2 PM10 PM2.5
Mobile 0 0 0 0 0 0
Area 1.8 - - - - -
Energy 0.1 0.9 0.7 0 0.1 0.1
Totals 1.8 0.9 0.7 0 0.1 0.1
SCAQMD Threshold 55 55 550 150 150 55
Significant No No No No No No
Source: CalEEMod 2022 Winter Emissions

As shown, both summer and winter season operational emissions are below SCAQMD thresholds. The Proposed Project would not exceed any SCAQMD thresholds for criteria pollutants during construction (see Table 2, 3). Operational emissions are less than significant and would not result in a cumulatively considerable net increase of any criteria pollutant (see Tables 4 and 5). Therefore, less than significant adverse impacts are identified or anticipated, and no mitigation measures are required.

SCAQMD has developed a methodology to assess the localized impacts of emissions from a Proposed Project as outlined within the Final Localized Significance Threshold (LST) Methodology report; completed in June 2003 and revised in July 2008. The use of LSTs is voluntary, to be implemented at the discretion of local public agencies acting as a lead agency pursuant to CEQA. LSTs apply to projects that must undergo CEQA or the National Environmental Policy Act (NEPA) and are five acres or less. LST methodology is incorporated to represent worst- 487
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case scenario emissions thresholds. CalEEMod was used to estimate the on -site and off -site construction emissions. The LSTs were developed to analyze the significance of potential air quality impacts of a project to sensitive receptors (i.e. schools, single family residences, etc.) and provide screening tables for small projects (one, two, or five acres). Projects are evaluated based on geographic location and distance from the sensitive receptor (25, 50, 100, 200, or 500 meters from the site).

For the purposes of a CEQA analysis, the SCAQMD considers a sensitive receptor to be a receptor such as a residence, hospital, convalescent facility or anywhere that it is possible for an individual to remain for 24 hours. Additionally, schools, playground s, childcare centers, and athletic facilities can also be considered as sensitive receptors. Commercial and industrial facilities are not included in the definition of sensitive receptor because employees do not typically remain on-site for a full 24 hours, but are usually present for shorter periods of time, such as eight hours.

The Project Site is approximately 4.0 acres. For a conservative, worst-case analysis, the “5-acre” LSTs were applied, as larger sites correspond to higher screening thresholds. The nearest sensitive receptor is a motel located approximately 100 meters sout heast of the Site, so LSTs were evaluated at this distance. The Proposed Project’s construction and operational emissions with the appropriate LST are presented in Table 6 “Localized Significant Threshold”.

Table 6
Localized Significance Thresholds
(Pounds Per Day)
Source NOx CO PM10 PM2.5
Construction Emissions
(Max. from Tables 2, 3) 38.0 29.2 0.9 5.1
Operational Emissions
(Max. Total from Tables 4, 5)1 1.8 4.6 0.2 0.2
Highest Value (lbs/day) 38.0 29.2 0.9 0.2 5.1 0.2
LST Threshold 378 5,188 65* 17† 16* 5†
Greater Than Threshold No No No No No No
Sources: CalEEMod.2022 Summer and Winter Emissions; SCAQMD Final Localized Significance Threshold Methodology; SCAQMD Mass Rate Look-up Tables for a 5-acre site in SRA No. 34 Central San Bernardino Valley, distance of 25 meters.

Note: PM10 and PM2.5 emissions are separated into construction and operational thresholds in accordance with the SCAQMD Mass Rate LST Look-up Tables.
* Construction emissions LST
† Operational emissions LST
Per LST Methodology, mobile source emissions do not need to be included except for land use emissions and onsite vehicle emissions. It is estimated that approximately 10 percent of mobile emissions will occur on the Project Site.

As shown in Table 6, both construction and operational emissions are well below the applicable thresholds. As such, the potential for adverse health effects is minimal. Therefore, a Health Risk Assessment (HRA) is not required for the Proposed Project. Therefore, no significant adverse air quality impacts are identified or anticipated, and no mitigation measures are required.

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WATER QUALITY

A Hydrology Study was prepared for the Proposed Project dated A ugust 16, 2023, revised July 22, 2024 by Land Development Design Company, LLC (LDDC), the results are summarized herein (Appendix E). The Proposed Project would disturb approximately four (4) acres and would therefore be subject to the National Pollutant Discharge Elimination System (NPDES) permit. The State of California is authorized to administer various aspects of the NPDES. Const ruction activities covered under the State’s General Construction permit include the removal of vegetation, grading, excavating, or any other activity that causes the disturbance of one acre or more. The General Construction permit requires recipients to reduce or eliminate non-storm water discharges into stormwater systems, and to develop and implement a SWPPP. The SWPPP is based on the principles of Best Management Practices (BMPs) to control and abate pollutants.

The SWPPP must include BMPs to prevent Pr oject-related pollutants from impacting surface waters.

The RWQCB has issued an area wide NPDES Storm Water Permit for the County of San Bernardino, the San Bernardino County Flood Control District and the unincorporated areas of San Bernardino County. The implementation of NPDES permits ensures that the State and Federal mandatory standards for the maintenance of clean water are met.

The State of California is authorized to administer various aspects of the National Pollutant Discharge Elimination System (NPDES). Construction activities covered under the State’s General Construction permit include removal of vegetation, grading, excava ting, or any other activity that causes the disturbance of one acre or more. Since the Proposed Project would disturb approximately 4.0 acres, it is subject to the NPDES permit requirements. Pursuant to Fontana Municipal Code (FMC) Section 23-516, Compliance with Mandated Best Management Practices, operation of the Proposed Project would be required to comply with applicable BMPs that may include waste storage areas to reduce pollution introduction , outdoor material storage areas to reduce pollution introduction, finish grade of landscaped areas at a minimum of 1-2 inches below top of curb, sidewalk, or pavement, use of efficient irrigation systems and landscape design, water conservation, smart controllers, and source control. Overall, upon compliance with FMC Chapter 23, Article 9, Preventing Discharge of Pollutants into Storm Drains, and implementation of the BMPs, project construction and operations would not result in any significant effects relating to water quality. Therefore, impacts regarding water quality are considered less than significant.

As demonstrated above, approval of the project would not result in any significant effects relating to traffic, noise, air quality, or water quality and therefore Criteria (d) is met.

Criterion (e) The site can be adequately served by all required utilities and public services.

The City of Fontana Public Works Department provides wastewater and stormwater collection services and oversees solid waste collection services (contracted to Burrtec), and the Fontana Water Company provides water services to the Project Site. Southern California Edison and Southern California Gas Company would provide electricity and natural gas services, respectively. Additionally, the project would be served by the Fontana Fire Protection District for fire protection services, and the Fontana Police Department for police protection services.

The Project Site is located within the service area of the Fontana Water Company (FWC) as a division of the San Gabriel Valley Water Company. The Proposed Project would include 489
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connection to existing FWC water mains along Hilton Drive. The Proposed Project would be served by the City of Fontana for sewer service; existing service lines are located in Hilton Drive.

Thus, the site would be adequately served by all required utilities and services and the project would meet Criterion (e) requirements.

The following analysis considers whether exceptions to the Class 32 Categorical Exemption apply:

Exception (a) A categorical exemption shall not be used for a project under Classes 3, 4, 5, 6, and 11, if the project may impact on an environmental resource of hazardous or critical concern where designated, precisely mapped, and officially adopted pursuant to law by federal, state, or local agencies.

The City is proposing a categorical exemption under Class 32 and not Classes 3, 4, 5, 6, or 11.

Therefore, Exception (a) would not apply to the project.

Exception (b) A categorical exemption shall not be used for a project when the cumulative impact of successive projects of the same type in the same place, over time is significant.

For this Exception, that disallows a categorical exemption to be used for a project when the cumulative impact of successive projects “of the same type in the same place over time” has a narrower definition than the broad definition of cumulative impacts a s defined and applied elsewhere in CEQA practice. Further in Robinson v. City & County of San Francisco (2012) 208 Cal.App.4th 950, 958, the court held that the phrase “in the same place” should be interpreted to refer to the area where the environmental impact will occur and that the affected area will depend on the nature of the environmental impact.

The project involves the development of two industrial warehouses. The Project Site is located within a developed area of the City’s west end area consisting predominately industrial uses .

Based on the analysis herein, the project would not considerably contribute to any significant impacts. As such, project impacts are not cumulatively considerable, and Exception Criterion (b) would not apply to the project.

Exception (c) A categorical exemption shall not be used for an activity where there is a reasonable possibility that the activity will have a significant effect on the environment due to unusual circumstances.

This exception applies only when both unusual circumstances and a significant impact as a result of those unusual circumstances are shown. ( Berkeley Hillside Preservation v City of Berkeley “Berkeley Hillside” (2015) 60 Cal.4th 1086, 1104) As the Supreme Court explained in Berkeley Hillside, the City’s determination whether this exception applies involves two distinct questions:
(1) whether the project presents unusual circumstances, and (2) if the project presents unusual circumstances, whether there is a reasonable possibility that a signi ficant environmental impact will result from those unusual circumstances. (60 Cal.4th at 1098.) The City considers the second prong of this two‐part test only if it first finds that some circumstance of the project is unusual. If the City finds that the project does not present unusual circumstances, the exception is inapplicable, and the agency need not reach the second prong of the two‐part test.

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Here, the City’s determination whether the proposed project presents unusual circumstances involves a factual inquiry under which the City weighs the relevant evidence to determine if those circumstances are unusual in comparison with other projects in the CEQA Guidelines Section 15332. The Proposed Project would not be used for an activity where there is a reasonable possibility that the activity will have a significant effect on the environment due to unusual circumstances and involves construction activities typical for other similar projects in the City that have been approved pursuant to the CEQA Guidelines section 15332 exemption. An example of a similar project approved by the City pursuant to the CEQA Guidelines Section 15332 exemption is the warehouse project (MCN22 -057), which was approved by the Fontana Planning Commission on December 20, 2022.

The summer and winter season operational and construction emissions are below SCAQMD thresholds. The Proposed Project would not exceed any SCAQMD thresholds for criteria pollutants. Additionally, the Proposed Project’s localized emissions are not anticipated to exceed Localized Significance Thresholds because emissions would be temporary, limited in intensity, and would occur over a short duration. Construction and operational activities would comply with applicable air quality regulations and incorporate standard best management practices, which would minimize pollutant concentrations near the Project site. Additionally, the distance to nearby sensitive receptors and prevailing dispersion conditions would reduce the potential for localized air quality impacts. Therefore, localized emissions would remain below significance thresholds.

As such, the Project Site has no value as habitat for endangered, rare, or threatened species.

With implementation of the Conditions of Approval, impacts to biological resources would be less than significant.

The existing noise levels range between 62.9 and 65.6 dBA CNEL and existing plus project construction noise levels would range between 63.2 and 65.7 dBA CNEL. Project construction traffic would result in a less than 1 dB increase along both roadways and wo uld not exceed the applicable FICON noise increase thresholds. Impacts would be less than significant and no mitigation measures are required. The Proposed Project is considered an allowed use in accordance with the General Plan and West End Specific Plan standards. The proposed warehouses show compatibility with the surrounding industrial developments. Therefore, anticipated warehouses noise associated with the project is not expected to exceed the City’s noise standards and would not introduce a new subst antial noise source compared to existing conditions. Impacts would be less than significant.

The Proposed Project satisfies the City -established vehicle miles traveled (VMT) screening criteria for projects generating less than 500 daily trip. The Proposed Project is forecast to generate approximately 99 daily vehicle trips, including 9 vehicle trips during the AM peak hour and 11 vehicle trips during the PM peak hour which equates to approximately 150 daily PCE trips, including 13 PCE trips during the AM peak hour and 15 PCE trips during the PM peak hour..

Therefore, based on the City’s guidelines, the project would be screened out from a VMT analysis based on the daily trip thresholds and is anticipated to have a less than significant VMT impact.

As such, there is no evidence that the Proposed Project will, result in a significant effect on the environment.
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Exception (d) A categorical exemption shall not be used for a project which may result in damage to scenic resources, including but not limited to, trees, historic buildings, rock outcroppings, or similar resources, within a highway officially designated as a State scenic highway.

Based on the San Bernardino Countywide Map: NR-3 Scenic Routes & Highways, there are no scenic highways near the Project Site or within the City of Fontana. 6 The closest officially designated or eligible State scenic highway is Lytle Creek Canyon Drive located approximately

6.0 miles to the north in Rancho Cucamonga, San Bernadino County. Given the distance of the Project Site to Lytle Creek Canyon Drive and intervening topography, vegetation, and structures, the project would not be visible. As such, the Proposed Project would have no impact on scenic resources within a State scenic highway and Exception (d) would not apply.

Exception (e) A categorical exemption shall not be used for a project located on a site which is included on any list complied pursuant to Section 65962.5 of the Government Code.

Government Code Section 65962.5 requires the Department of Toxic Substance Control and State Water Resources Control Board to compile and update a regulatory site listing (per the criteria of the Section). The California Department of Health Services is also required to compile and update, as appropriate, a list of all public drinking water wells that contain detectable levels of organic contaminants and that are subject to water analysis pursuant to Health and Safety Code Section 116395. Section 65962.5 re quires the local enforcement agency, as designated pursuant to Section 18051 of Title 14 of the CCR, to compile, as appropriate, a list of all solid waste disposal facilities from which there is a known migration of hazardous waste. The Project Site is not currently listed pursuant to Government Code Section 65962.5 (Cortese List).7 As such, Exception (e) would not apply.

Exception (f) A categorical exemption shall not be used for a project which may cause a substantial adverse change in the significance of a historical resource.

A Cultural Resources Report dated March 2022 were prepared for the Proposed Project by LSA Associates. (Appendix F). The findings are summarized herein.

According to LSA, the cultural resources records search was completed for the project area by the South Central Coastal Information Center (SCCIC) located at California State University, Fullerton. It included a review of all recorded historic and prehistoric archaeological sites within one mile of the project. Data from the SCCIC indicate there have been 23 cultural resource studies previously conducted within one mile of the proposed project, three of which included the entirety of the project area. Although no cultural resources are documented within the project area, 21 built environment resources are recorded within one mile. The nearest is approximately 100 feet south of the project. Only one of the resources is listed in the BERD (36 -015392). No prehistoric resources are documented within a mile.

A cultural resources records search, additional research, and a field survey were conducted for the project area. No cultural resources are documented within the project parcel and none was

6 San Bernardino Countywide Map:NR-3 Scenic Routes & Highways. Accessed July 25, 2025. 7 California Environmental Protection Agency, Cortese Listing , https://calepa.ca.gov/sitecleanup/corteselist/, accessed July 25, 2025.
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identified by the survey. No prehistoric resources were documented within a mile, and sensitivity for in situ undocumented subsurface resources is low. Therefore, no further investigation or archaeological monitoring is recommended. However, it is recommended that archaeological monitoring consistent with the City of Fontana’s standard condition for cultural resources be implemented. Below is the City of Fontana’s standard condition for cultural resources monitoring:

1. Upon discovery of any tribal cultural or archaeological resources, cease construction activities in the immediate vicinity of the find until the find can be assessed. All tribal cultural and archaeological resources unearthed by project construction activities shall be evaluated by the qualified archaeologist and tribal monitor/consultant. If the resources are Native American in origin, interested Tribes (as a result of correspondence with area Tribes) shall coordinate with the landowner regarding treatment and curation of these resources. Typically, the Tribe will request preservation in place or recovery for educational purposes. Work may continue on other parts of the project while evaluation takes place.

Preservation in place shall be the preferred manner of treatment. If preservation in place is not feasible, treatment may include implementation of archaeological data recovery excavation to remove the resource along the subsequent laboratory processing and analysis. All Tribal Cultural Resources shall be returned to the Tribe. Any historic archaeological material that is not Native American in origin shall be curated at a public, non-profit institution with a research interest in the materials, if such an institution agrees to accept the material. If no institution accepts the archaeological material, they shall be offered to the Tribe or a local school or historical society in the area for educational purposes.

Archaeological and Native American monitoring and excavation during construction projects shall be consistent with current professional standards. All feasible care to avoid any unnecessary disturbance, physical modification, or separation of human remains and associated funerary objects shall be taken. Principal personnel shall meet the Secretary of the Interior standards for archaeology and have a minimum of 10 years’ experience as a principal investigator working with Native American archaeological sites in southern California. The Qualified Archaeologist shall ensure that all other personnel are appropriately trained and qualified.

As such, Exception (f) would not apply.

CONCLUSION

As detailed above, construction and operations of the Project meets the five criteria required stipulated in CEQA Guidelines Section 15332 to qualify for a Class 32 CE.

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REFERENCES

Gandini Group, Inc., Hilton Industrial Facility Project Traffic Memorandum, December 9, 2025

Gandini Group, Inc., Hilton Industrial Facility Project Focused Noise Impact Analysis, December 23, 2025

LSA Associates, Inc., Cultural Resources Report for the Hilton Industrial Facility Business Park Project, March 2022

Land Development Design Company, LLC., Hydrology Study for Lot 2. Tract 13643 APN1110- 151-03 Memorandum, February August 16,2023, revised July 22, 2024

California Environmental Protection Agency, Cortese Listing , https://calepa.ca.gov/sitecleanup/corteselist/, accessed July 2025.

California Regional Water Quality Control Board Los Angeles Region, Order R8 -2010-0036 (NPDES Permit No. CAS618036), January 29, 2010 ,
https://www.waterboards.ca.gov/santaana/board_decisions/adopted_orders/orders/2010 /10_036_sbc_ms4_permit_01_29_10.pdf, accessed July 20 2025.

City of Fontana, City of Fontana General Plan Land Use Map , https://www.fontanaca.gov/DocumentCenter/View/44297, accessed July 2025.

City of Fontana, City of Fontana Zoning District Map ,
https://www.fontanaca.gov/DocumentCenter/View/30623/Zoning-District-Map, July 2025.

City of Fontana, Fontana Forward General Plan Update 2015-2035, November 13, 2018.

City of Fontana, Fontana Forward General Plan Update 2015 -2035 Draft Environmental Impact Report, June 2018.

City of Fontana, Fontana Forward General Plan Update 2015-2045, Land Use, Zoning, and Urban Design Element, updated July 23, 2023

City of Fontana, Form Based Code Districts ,
https://www.fontanaca.gov/DocumentCenter/View/32043/All-Form-Based-Code-Districts, September 10, 2019.

Jennings Environmental , LLC Biological Resources Assessment for Hilton Drive Industrial Project, September 10, 2025

Lilburn Corporation, CalEEMod Detailed Report, July 2025.

San Bernardino Countywide Plan Maps, Natural Resources - NR-3 Scenic Routes & Highways, accessed July 2025.

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APPENDICES

Appendix A Biological Resources Assessment Letter

Appendix B Traffic Memorandum

Appendix C Noise Impact Analysis

Appendix D CalEEMod Detailed Report

Appendix E Hydrology Study

Appendix F Cultural Resources Study

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APPENDIX A

BIOLOGICAL RESOURCES

ASSESSMENT LETTER

496

35414 Acacia Ave.

Yucaipa, CA 92399
(909) 534-4547
www.jennings-environmental.com

Jennings Environmental, LLC P a g e | 1
September 10, 2025

Lilburn Corporation
Attn: Cheryl Tubbs
1905 Business Center Drive
San Bernardino, CA 92408

RE: BIOLOGICAL RESOURCES ASSESSMENT LETTER REPORT FOR THE HILTON DRIVE

INDUSTRIAL PROJECT IN THE CITY OF FONTANA, SAN BERNARDINO COUNTY, CALIFORNIA

Dear Ms. Tubbs,
Jennings Environmental was retain ed by Lilburn Corporation (Lilburn) to conduct a Biological Resources Assessment of the proposed Hilton Drive Industrial Project (Project). The survey identified vegetation communities, the potential for the occurrence of special status species, or habitats that could support special status wildlife species, and recorded all plants and animals observed or detected within the Project boundary. This biological resources assessment is designed to address the potential effects of the proposed project on designated critical habitats and/or any species currently listed or formally proposed for listing as endangered or threatened under the federal Endangered Species Act (ESA) and the California Endangered Species Act (CESA) or species designated as sensitive by the California Department of Fish and Wildlife (CDFW) or the California Native Plant Society (CNPS). Information contained in this document is in accordance with accepted scientific and technical standards that are consistent with the requirements of the United States Fish and Wildlife Service (USFWS) and (CDFW).

Project Description and Location

The proposed Project is to develop the 3.37 -acre site with two industrial buildings . Both buildings will have office space, warehouse space , and trucking bays. Additional improvements include parking, landscaping, and lighting.

The Project is generally located in Section 2, Township 1 South, Range 6 West, and is depicted in the Fontana U.S. Geological Survey’s (USGS) 7.5-minute topographic map. More specifically, the project is located within Assessor Parcel Number ( APN) 1110-151-03, within the City of Fontana, San Bernardino County, California. The site is bordered by commercial and industrial uses on all sides, with a Southern California Edison office and storage yard to the west.

Methods

Prior to performing the updated field survey, existing documentation relevant to the Project site was reviewed. The most recent records of the California Natural Diversity Database (CNDDB) managed by CDFW (CDFW 2025), the USFWS Critical Habitat Mapper (USFWS 2025), and the California Native 497
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 2
Plant Society’s Electronic Inventory (CNPSEI) of Rare and Endangered Vascular Plants of California (CNPS 202 4) were reviewed for the following quadrangles containing and surrounding the Project site: Fontana, Devore, Guasti, and Cucamonga Peak USGS 7.5 -minute quadrangles. The Devore, Guasti, and Cucamonga Peak quads were included in this search due to the site’s proximity to their borders. These databases contain records of reported occurrences of rare, federal- or state-listed endangered or threatened species, California Species of Concern (SSC), or otherwise special status species or habitats that may occur within or in the immediate vicinity of the Project site.

Jennings biologist, Gene Jennings, conducted the general reconnaissance survey within the Project site to identify the potential for the occurrence of special status species, vegetation communities, or habitats that could support special status wildlife sp ecies. The surveys were conducted on foot, throughout the Project site between 0730 and 0830 hours on September 10, 2025 . Weather conditions during the survey included temperatures ranging from 62 – 64 degrees Fahrenheit, with cloudy skies, no precipitation, and 0 to 2 miles per hour winds. Photographs of the Project site were taken to document existing conditions and are included in Attachment B.

Results

Habitat and Wildlife
The habitat on-site consists of disturbed ruderal vegetation and bare gravel ground. The site showed signs of previous development, concrete pads. Additionally, the site is highly disturbed, and soils consist of imported fill material, likely from the surrounding developed sites. T he site is also being maintained through weed abatement (mowing or weed whacking) as eviden ced by the minimal amount of vegetation on -site and dried , broken plant parts. Plant species observed on site are :
tumbleweed (Salsola tragus ), lemon gum (Corymbia citriodora ), telegraphweed (Heterotheca grandiflora), dove weed (Croton setiger), Mediterranean mustard (Hirschfeldia incana), desert poplar (Populus euphratica), and flatspine burragweed (Ambrosia acanthicarpa). None of these plants are documented as rare using the CNPS California Rare Plant Rank (CRPR) of 1 or 2.

Animal species observed or otherwise detected on or in the vicinity of the project site during the surveys included : mourning dove ( Zenaida macroura ), common raven (Corvus corax ), Anna’s hummingbird (Calypte anna), house finch (Haemorhous mexicanus), and house sparrow (Passer domesticus). None of the animal species documented on -site are considered rare, endangered, or threatened.

The Project site is located within a largely developed portion of the City of Fontana. As mentioned above, the site is continually maintained, and portions were previously developed. As such the site offers no habitat for any listed species.

CNDDB Results

According to the CNDDB, CNPSEI, and other relevant literature and databases, 87 sensitive or rare species, 18 of which are listed as threatened or endangered, and 5 sensitive habitats, have been documented in the Fontana, Devore, Guasti, and Cucamonga Peak quads. This list of sensitive species and habitats includes any State and/or federally -listed threatened or endangered species, CDFW-designated Species of Special Concern (SSC) , and otherwise Special Animals. “Special Animals” is a general term that refers to all of the taxa the CNDDB is interested in tracking, regardless of their legal or protection status. This list is also referred to as the list of “species at risk” or “special status species.” The CDFW considers the taxa on this list to be those of greatest conservation need. 498
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 3

An analysis of the likelihood of the occurrence of all CNDDB -sensitive species documented in the Fontana, Devore, Guasti, and Cucamonga Peak quads is provided in Table 1, in Attachment C. This analysis takes into account species range as well as documentation within the vicinity of the project area and includes the habitat requirements for each species and the potential for their occurrence on the site, based on required habitat elements and range relative to the current site conditions.

According to the databases, no sensitive habitat, including US FWS-designated critical habitat, occurs within or adjacent to the project site.

Designated Critical Habitat and San Bernardino County Biotic Resources Overlay

The site is not located within or adjacent to any USFWS-designated Critical Habitat. No further action is required.

The site is within the identified boundary for burrowing owl on the San Bernar dino County Biotic Resources Overlay. See below for findings related to this species, based on the completed habitat assessment.

Special Status Species Background
Burrowing owl (BUOW) {Athene cunicularia} [State – Candidate Endangered] The BUOW is a state and federal SSC. This owl is a mottled, brownish , sand-colored, dove -sized raptor, with large, yellow eyes, a rounded head lacking ear tufts, white eyebrows, and long legs compared to other owl species. It is a ground-dwelling owl typically found in arid prairies, fields, and open areas where vegetation is sparse and low to the ground. The BUOW is heavily dependent upon the presence of mammal burrows, with ground squirrel burrows being a common choice, in its habitat to provide shelter f rom predators, and inclement weather, and to provide a nesting place.

They are also known to make use of human-created structures, such as cement culverts and pipes, for burrows.

BUOW spends a great deal of time standing on dirt mounds at the entrance to a burrow or perched on a fence post or other low -to-the-ground perch from which they hunt for prey. BUOW frequently hunt by hovering in place above the ground and dropping on their prey from above. They feed primarily on insects such as grasshoppers, June beetles, and moths, but will also take small rodents, birds, and reptiles. They are active during the day and night but are considered a crepuscular owl; generally observed in the early morning hours or at twilight. The breeding season for BUOW is February 1 through August 31. Up to 11, but typically 7 to 9, eggs are laid in a burrow, abandoned pipe, or other subterranean hollows where incubation is complete in 28 -30 days. Young BUO W fledges in 44 days. The BUOW is considered a migratory species in portions of its range, which includes western North America from Canada to Mexico, and east to Texas and Louisiana. BUOW populations in California are considered to be sedentary or locally migratory.

Throughout its range, the BUOW is vulnerable to habitat loss, predation, vehicular collisions, and destruction of burrow sites, and the poisoning of ground squirrels . BUOW has disappeared from significant portions of their range in the last 15 years. The BUOW is listed under the California Endangered Species Act as a candidate species . The BUOW is a migratory bird protected by the international treaty under the Migratory Bird Treaty Act of 1918 and by State law under the California Fish and Game Code (CDFG Code #3513 & #3503.5).
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Findings: The conditions present on -site are not suitable for BUOW. California ground squirrels, a burrow surrogate species, were not observed on-site. No evidence of BUOW was found in the survey area. No burrows of appropriate size, aspect, or shape were located and no BUOW pellets, feathers, or whitewash were found. No burrowing owl individuals were observed. Additionally, the site does not contain friable soils , as evidence of gravel and cobble fill was found on-site. These factors preclude this species from the site. Therefore, no further surveys or mitigation measures are required or recommended.

Conclusions and Recommendations

Based on the literature review and personal observations made in the immediate vicinity, no rare, State and/or federally -listed threatened or endangered species are documented/or expected to occur within the Project site. Additionally, no plant species with the CNPS California Rare Plant Rank (CRPR) of 1 or 2 were observed on-site or documented to occur on-site in the relevant databases. No other sensitive species were observed within the project area or buffer area.

The Project Site is highly disturbed. T he habitat on-site is ruderal/disturbed vegetation with gravel surfaces. The site offers no suitable habitat for any rare sensitive species including listed species.

Therefore, no further surveys are required.

Nesting Birds

Although the site is highly disturbed, there is some habitat within the Project site and adjacent area that is suitable for nesting birds in general. In general, the following condition of approval should be implemented prior to construction.

Nesting bird season generally extends from February 1 through September 15 in southern California and specifically, March 15 through August 31 for migratory passerine birds. To avoid impacts to nesting birds (common and special status) during the nesting season, a qualified Avian Biologist will conduct pre ‐construction Nesting Bird Surveys (NBS) prior to Project‐related disturbance to nestable vegetation to identify any active nests. If no active nests are found, no further action will be required. If an active nest is found, the biologist will set appropriate no‐work buffers around the nest which will be based on the nesting species, its sensitivity to disturbance, nesting stage, and expected types, intensity, and duration of the disturbance. The nests and buffer zones shall be field -checked weekly by a qualified biological monitor. The approved no ‐work buffer zone shall be clearly marked in the field, within which no disturbance activity shall commence until the qualified biologist has determined the young birds have successfully fledged and the nest is inactive.

Certification

I hereby certify that the statements furnished herein, and in the attached exhibits present data and information required for this analysis to the best of my ability, and the facts, statements, and information presented are true and correct to the best of my knowledge and belief. This report was prepared in accordance with professional requirements and standards. Fieldwork conducted for this assessment was performed by me. I certify that I have not signed a non-disclosure or consultant confidentiality agreeme nt with the project proponent and that I have no financial interest in the project.

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Please do not hesitate to contact me at 909 -534-4547 should you have any questions or require further information.

Sincerely,

Gene Jennings
Principal/Regulatory Specialist

Attachments:

Attachment A – Figures
Attachment B – Site Photos
Attachment C – Table 1

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Attachment A - Figures
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503
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504
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Attachment B - Photos
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Photo 1 –
Southwest corner
of Project site,
facing northeast.

Photo 2 – Center
of western edge
of Project site,
facing east.
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Photo 3 – Center
of eastern edge of
Project site,
facing west.

Photo 4 – Center
of eastern edge of
Project site,
facing northwest.
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Attachment C – Table 1
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Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Agelaius tricolor tricolored
blackbird
None,
Threatened
G1G2, S2,

CDFW-SSC
Highly colonial species, most
numerous in Central Valley and vicinity.

Largely endemic to California. Requires
open water, protected nesting
substrate, and foraging area with insect
prey within a few km of the colony.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Ambrosia
monogyra
singlewhorl
burrobrush None, None G5, S2,
2B.2
Chaparral, Sonoran desert scrub.

Sandy soils. 5-475 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Anniella stebbinsi
Southern
California legless
lizard
None, None G3, S3,

CDFW-SSC
Generally south of the Transverse
Range, extending to northwestern Baja
California. Occurs in sandy or loose
loamy soils under sparse vegetation.

Disjunct populations in the Tehachapi
and Piute Mountains in Kern County.

Variety of habitats; generally in moist,
loose soil. They prefer soils with a high
moisture content.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Arctostaphylos
glandulosa ssp.
gabrielensis
San Gabriel
manzanita None, None G5T3, S3,
1B.2
Chaparral. Rocky outcrops; can be
dominant shrub where it occurs. 960-
2015 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
509
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 14
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Arenaria
paludicola marsh sandwort Endangered,
Endangered
G1, S1,
1B.1
Marshes and swamps. Growing up
through dense mats of Typha, Juncus,
Scirpus, etc. in freshwater marsh.

Sandy soil. 3-170 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Arizona elegans
occidentalis
California glossy
snake None, None G5T2, S2,

CDFW-SSC
Patchily distributed from the eastern
portion of San Francisco Bay, southern
San Joaquin Valley, and the Coast,
Transverse, and Peninsular ranges,
south to Baja California. Generalist
reported from a range of scrub and
grassland habitats, often with loose or
sandy soils.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Artemisiospiza
belli belli Bell's sparrow None, None
G5T2T3,
S3, CDFW-
WL
Nests in chaparral dominated by fairly
dense stands of chamise. Found in
coastal sage scrub in south of range.

Nest located on the ground beneath a
shrub or in a shrub 6-18 inches above
ground. Territories about 50 yds apart.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Asplenium
vespertinum
western
spleenwort None, None G3?, S4,

4.2 Chaparral, Cismontane woodland,
Coastal scrub
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
510
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 15
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Athene cunicularia burrowing owl
None,
Candidate
Endangered
G4, S2,

CDFW-SSC
Open, dry annual or perennial
grasslands, deserts, and scrublands
characterized by low-growing
vegetation. Subterranean nester,
dependent upon burrowing mammals,
most notably, the California ground
squirrel.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Batrachoseps
gabrieli
San Gabriel
slender
salamander
None, None G2G3,
S2S3
Known only from the San Gabriel Mtns.

Found under rocks, wood, and fern
fronds, and on soil at the base of talus
slopes. Most active on the surface in
winter and early spring.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Bombus crotchii Crotch's bumble
bee
None,
Candidate
Endangered
G2, S2
Coastal California east to the Sierra-
Cascade crest and south into Mexico.

Food plant genera include Antirrhinum,
Phacelia, Clarkia, Dendromecon,
Eschscholzia, and Eriogonum.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Bombus
pensylvanicus
American
bumble bee None, None G3G4, S2
Long-tongued; forages on a wide variety
of flowers including vetches (Vicia),
clovers (Trifolium), thistles (Cirsium),
sunflowers (Helianthus), etc. Nests
above ground under long grass or
underground. Queens overwinter in
rotten wood or underground.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
511
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 16
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
California Walnut
Woodland
California Walnut
Woodland None, None G2, S2.1 Cismontane woodland This habitat type is absent from the Project site.

Calochortus
catalinae
Catalina
mariposa lily None, None G3G4,
S3S4, 4.2
Chaparral, Cismontane woodland,
Coastal scrub, Valley and foothill
grassland
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Calochortus
plummerae
Plummer's
mariposa-lily None, None G4, S4, 4.2
Coastal scrub, chaparral, valley and
foothill grassland, cismontane
woodland, lower montane coniferous
forest. Occurs on rocky and sandy sites,
usually of granitic or alluvial material.

Can be very common after fire. 60-2500
m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Calochortus weedii
var. intermedius
intermediate
mariposa-lily None, None G3G4T3,
S3, 1B.2
Coastal scrub, chaparral, valley and
foothill grassland. Dry, rocky
calcareous slopes and rock outcrops.
60-1575 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Catostomus
santaanae Santa Ana sucker Threatened,
None
G1, S1,

CDFW-SSC
Endemic to Los Angeles Basin south
coastal streams. Habitat generalists,
but prefer sand-rubble-boulder
bottoms, cool, clear water, and algae.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
512
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 17
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Chaetodipus fallax
fallax
northwestern
San Diego pocket
mouse
None, None G5T3T4,
S3S4
Coastal scrub, chaparral, grasslands,
sagebrush, etc. in western San Diego,
Riverside, San Bernardino, and Los
Angeles Counties, inclusive of Orange
County. Sandy, herbaceous areas,
usually in association with rocks or
coarse gravel.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Chaetodipus fallax
pallidus
pallid San Diego
pocket mouse None, None G5T3T4,
S3S4
Desert border areas of San Diego,
Riverside, San Bernardino, and Los
Angeles counties in desert wash, desert
scrub, desert succulent scrub, pinyon-
juniper, etc. Sandy, herbaceous areas,
usually in association with rocks or
coarse gravel.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Chloropyron
maritimum ssp.
maritimum
salt marsh bird's-
beak
Endangered,
Endangered
G4?T1, S1,
1B.2
Marshes and swamps, coastal dunes.

Limited to the higher zones of salt
marsh habitat. 0-10 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Chorizanthe parryi
var. parryi
Parry's
spineflower None, None G3T2, S2,
1B.1
Coastal scrub, chaparral, cismontane
woodland, valley and foothill grassland.

Dry slopes and flats; sometimes at
interface of 2 vegetation types, such as
chaparral and oak woodland. Dry,
sandy soils. 90-1220 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
513
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 18
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Chorizanthe xanti
var. leucotheca
white-bracted
spineflower None, None G4T3, S3,
1B.2
Mojavean desert scrub, pinyon and
juniper woodland, coastal scrub
(alluvial fans). Sandy or gravelly places.
365-1830 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Cicindela
tranquebarica
viridissima
greenest tiger
beetle None, None G5T1, S1
Inhabits the woodlands adjacent to the
Santa Ana River basin. Usually found in
open spots between trees.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Cladium
californicum
California saw-
grass None, None G4, S2,
2B.2
Meadows and seeps, marshes and
swamps (alkaline or freshwater).

Freshwater or alkaline moist habitats. -
40-2150 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Claytonia peirsonii
ssp. peirsonii
Peirson's spring
beauty None, None G2G3T2,
S2, 1B.2
Upper montane coniferous forest,
subalpine coniferous forest. Granitic
scree slopes, often with a sandy or fine
soil component and granitic cobbles.
1510-2745 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Coastal and Valley
Freshwater Marsh
Coastal and
Valley
Freshwater
Marsh
None, None G3, S2.1 Marsh & swamp | Wetland This habitat type is absent from the Project site.

Deinandra
paniculata
paniculate
tarplant None, None G4, S4, 4.2 Coastal scrub, Valley and foothill grassland, Vernal pools
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
514
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 19
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Diplacus johnstonii Johnston's
monkeyflower None, None G4, S4, 4.3
Lower montane coniferous forest
(disturbed areas, gravelly, roadsides,
rocky, scree)
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Dipodomys
merriami parvus
San Bernardino
kangaroo rat
Endangered,
Endangered
G5T1, S1,

CDFW-SSC
Alluvial scrub vegetation on sandy loam
substrates characteristic of alluvial
fans and flood plains. Needs early to
intermediate seral stages.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Dipodomys
stephensi
Stephens'
kangaroo rat
Threatened,
Threatened G2, S3
Primarily annual and perennial
grasslands, but also occurs in coastal
scrub and sagebrush with sparse
canopy cover. Prefers buckwheat,
chamise, brome grass and filaree. Will
burrow into firm soil.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Dodecahema
leptoceras
slender-horned
spineflower
Endangered,
Endangered
G1, S1,
1B.1
Chaparral, cismontane woodland,
coastal scrub (alluvial fan sage scrub).

Flood deposited terraces and washes;
associates include Encelia, Dalea,
Lepidospartum, etc. Sandy soils. 200-
765 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Eriastrum
densifolium ssp.
sanctorum
Santa Ana River
woollystar
Endangered,
Endangered
G4T1, S1,
1B.1
Coastal scrub, chaparral. In sandy soils
on river floodplains or terraced fluvial
deposits. 180-705 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
515
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 20
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Eriogonum
microthecum var.
alpinum
alpine slender
buckwheat None, None G5T3, S3,

4.3 Alpine dwarf scrub, Great Basin scrub
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Eriogonum
microthecum var.
johnstonii
Johnston's
buckwheat None, None G5T2, S2,
1B.3
Subalpine coniferous forest, upper
montane coniferous forest. Slopes and
ridges on granite or limestone. 1795-
2865 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Eriogonum
umbellatum var.
minus
alpine sulfur-
flowered
buckwheat
None, None G5T4, S4,

4.3 Subalpine coniferous forest, Upper
montane coniferous forest
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Eriophyllum
lanatum var.
obovatum
southern Sierra
woolly sunflower None, None G5T4, S4,

4.3 Lower montane coniferous forest,
Upper montane coniferous forest
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Eugnosta
busckana Busck's gallmoth None, None G1G3,
S2S3
Coastal southern California. Tiny micro-
moth (1 cm) with larva forming galls on
host plant Encelia californica
(California brittlebush). Adult flight
period is during winter, generally from
November to February, and have been
reported at UV lights and porch lights.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
516
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 21
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Eumops perotis
californicus
western mastiff
bat None, None
G4G5T4,
S3S4,

CDFW-SSC
Many open, semi-arid to arid habitats,
including conifer and deciduous
woodlands, coastal scrub, grasslands,
chaparral, etc. Roosts in crevices in cliff
faces, high buildings, trees and tunnels.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Fritillaria
pinetorum pine fritillary None, None G4, S4, 4.3
Chaparral, Lower montane coniferous
forest, Pinyon and juniper woodland,
Subalpine coniferous forest, Upper
montane coniferous forest
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Galium
angustifolium ssp.
gabrielense
San Antonio
Canyon bedstraw None, None G5T3, S3,

4.3 Chaparral, Lower montane coniferous
forest
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Galium jepsonii Jepson's
bedstraw None, None G3, S3, 4.3 Lower montane coniferous forest, Upper montane coniferous forest
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Galium johnstonii Johnston's
bedstraw None, None G4, S4, 4.3
Chaparral, Lower montane coniferous
forest, Pinyon and juniper woodland,
Riparian woodland
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
517
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 22
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Gila orcuttii arroyo chub None, None G1, S2,

CDFW-SSC
Native to streams from Malibu Creek to
San Luis Rey River basin. Introduced
into streams in Santa Clara, Ventura,
Santa Ynez, Mojave and San Diego river
basins. Slow water stream sections
with mud or sand bottoms. Feeds
heavily on aquatic vegetation and
associated invertebrates.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Heuchera
caespitosa
urn-flowered
alumroot None, None G3, S3, 4.3
Cismontane woodland, Lower montane
coniferous forest, Riparian forest
(montane), Upper montane coniferous
forest
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Horkelia cuneata
var. puberula mesa horkelia None, None G4T1, S1,
1B.1
Chaparral, cismontane woodland,
coastal scrub. Sandy or gravelly sites.
15-1645 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Juglans californica
Southern
California black
walnut
None, None G4, S4, 4.2 Chaparral, Cismontane woodland,
Coastal scrub, Riparian woodland
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Juncus duranii Duran's rush None, None G3, S3, 4.3
Lower montane coniferous forest,
Meadows and seeps, Upper montane
coniferous forest
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
518
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 23
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Lasiurus xanthinus western yellow
bat None, None G4G5, S3,

CDFW-SSC
Found in valley foothill riparian, desert
riparian, desert wash, and palm oasis
habitats. Roosts in trees, particularly
palms. Forages over water and among
trees.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Laterallus
jamaicensis
coturniculus
California black
rail
None,
Threatened
G3T1, S2,

CDFW-FP
Inhabits freshwater marshes, wet
meadows and shallow margins of
saltwater marshes bordering larger
bays. Needs water depths of about 1
inch that do not fluctuate during the
year and dense vegetation for nesting
habitat.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Lepechinia
fragrans
fragrant pitcher
sage None, None G3, S3, 4.2 Chaparral
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Lepidium
virginicum var.
robinsonii
Robinson's
pepper-grass None, None G5T3, S3,

4.3 Chaparral, coastal scrub. Dry soils,
shrubland. 4-1435 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Lepus californicus
bennettii
San Diego black-
tailed jackrabbit None, None G5T3T4,
S3S4
Intermediate canopy stages of shrub
habitats and open shrub / herbaceous
and tree / herbaceous edges. Coastal
sage scrub habitats in Southern
California.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
519
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 24
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Lilium humboldtii
ssp. ocellatum
ocellated
Humboldt lily None, None G4T4?,
S4?, 4.2
Chaparral, Cismontane woodland,
Coastal scrub, Lower montane
coniferous forest, Riparian woodland
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Lilium parryi lemon lily None, None G3, S3,
1B.2
Lower montane coniferous forest,
meadows and seeps, riparian forest,
upper montane coniferous forest. Wet,
mountainous terrain; generally in
forested areas; on shady edges of
streams, in open boggy meadows and
seeps. 625-2930 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Linanthus
concinnus
San Gabriel
linanthus None, None G2, S2,
1B.2
Lower montane coniferous forest,
upper montane coniferous forest,
chaparral. Dry rocky slopes, often in
Jeffrey pine/canyon oak forest. 1310-
2560 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Lycium parishii Parish's desert-
thorn None, None G4, S1,
2B.3
Coastal scrub, Sonoran desert scrub. -
3-570 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Malacothamnus
parishii
Parish's
bushmallow None, None GXQ, SX,
1A
Chaparral, coastal sage scrub. In a
wash. 305-455 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
520
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 25
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Monardella
australis ssp.
jokerstii
Jokerst's
monardella None, None G4T1?,
S1?, 1B.1
Lower montane coniferous forest,
chapparal. Steep scree or talus slopes
between breccia. Secondary alluvial
benches along drainages and washes.
210-1740 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Monardella pringlei Pringle's
monardella None, None GX, SX, 1A Coastal scrub. Sandy hills. 300-400 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Monardella
saxicola rock monardella None, None G3, S3, 4.2
Chaparral, Closed-cone coniferous
forest, Lower montane coniferous
forest
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Muhlenbergia
californica California muhly None, None G4, S4, 4.3
Coastal scrub, chaparral, lower
montane coniferous forest, meadows
and seeps. Usually found near streams
or seeps. 100-2000 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Muhlenbergia utilis aparejo grass None, None G4, S2S3,
2B.2
Meadows and seeps, marshes and
swamps, chaparral, coastal scrub,
cismontane woodland. Sometimes
alkaline, sometimes serpentinite. 25-
2325 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
521
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 26
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Navarretia
prostrata
prostrate vernal
pool navarretia None, None G2, S2,
1B.2
Coastal scrub, valley and foothill
grassland, vernal pools, meadows and
seeps. Alkaline soils in grassland, or in
vernal pools. Mesic, alkaline sites. 3-
1235 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Neolarra alba white cuckoo bee None, None GH, SH
Known only from localities in Southern
California. Cleptoparasitic in the nests
of perdita bees.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Neotoma lepida
intermedia
San Diego desert
woodrat None, None
G5T3T4,
S3S4,

CDFW-SSC
Coastal scrub of Southern California
from San Diego County to San Luis
Obispo County. Moderate to dense
canopies preferred. They are
particularly abundant in rock outcrops,
rocky cliffs, and slopes.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Nyctinomops
femorosaccus
pocketed free-
tailed bat None, None G5, S3,

CDFW-SSC
Variety of arid areas in Southern
California; pine-juniper woodlands,
desert scrub, palm oasis, desert wash,
desert riparian, etc. Rocky areas with
high cliffs.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
522
Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 27
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Oncorhynchus
mykiss irideus pop.
10 steelhead -
southern
California DPS
Endangered,
Candidate
Endangered
G5T1Q, S1,
Federal listing refers to populations
from Santa Maria River south to
southern extent of range (San Mateo
Creek in San Diego County). Southern
steelhead likely have greater
physiological tolerances to warmer
water and more variable conditions.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Opuntia basilaris
var. brachyclada
short-joint
beavertail None, None G5T3, S3,
1B.2
Chaparral, Joshua tree woodland,
Mojavean desert scrub, pinyon and
juniper woodland. Sandy soil or coarse,
granitic loam. 425-2015 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Oreonana vestita woolly mountain-
parsley None, None G3, S3,
1B.3
Subalpine coniferous forest, upper
montane coniferous forest, lower
montane coniferous forest. High ridges;
on scree, talus, or gravel. 800-3370 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Ovis canadensis
nelsoni
desert bighorn
sheep None, None G4T3, S3,

CDFW-FP
Widely distributed from the White Mtns
in Mono Co. to the Chocolate Mts in
Imperial Co. Open, rocky, steep areas
with available water and herbaceous
forage.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
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Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 28
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Perognathus
longimembris
brevinasus
Los Angeles
pocket mouse None, None
G5T2,
S1S2,

CDFW-SSC
Lower elevation grasslands and coastal
sage communities in and around the
Los Angeles Basin. Open ground with
fine, sandy soils. May not dig extensive
burrows, hiding under weeds and dead
leaves instead.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Phacelia
mohavensis Mojave phacelia None, None G4Q, S4,

4.3 Cismontane woodland, Lower montane
coniferous forest, Meadows and seeps,
Pinyon and juniper woodland
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Phacelia stellaris Brand's star
phacelia None, None G1, S1,
1B.1
Coastal scrub, coastal dunes. Open
areas. 3-370 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Phrynosoma
blainvillii
coast horned
lizard None, None G4, S4,

CDFW-SSC
Frequents a wide variety of habitats,
most common in lowlands along sandy
washes with scattered low bushes.

Open areas for sunning, bushes for
cover, patches of loose soil for burial,
and abundant supply of ants and other
insects.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
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Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Polioptila
californica
californica
coastal
California
gnatcatcher
Threatened,
None
G4G5T3Q,
S2, CDFW-
SSC
Obligate, permanent resident of coastal
sage scrub below 2500 ft in Southern
California. Low, coastal sage scrub in
arid washes, on mesas and slopes. Not
all areas classified as coastal sage
scrub are occupied.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Pseudognaphalium
leucocephalum
white rabbit-
tobacco None, None G4, S2,
2B.2
Riparian woodland, cismontane
woodland, coastal scrub, chaparral.

Sandy, gravelly sites. 35-515 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Quercus durata
var. gabrielensis San Gabriel oak None, None G4T3, S3,

4.2 Chaparral, Cismontane woodland
Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Rana muscosa
southern
mountain yellow-
legged frog
Endangered,
Endangered
G1, S2,

CDFW-WL
Disjunct populations known from
southern Sierras (northern DPS) and
San Gabriel, San Bernardino, and San
Jacinto Mtns (southern DPS). Found at
1,000 to 12,000 ft in lakes and creeks
that stem from springs and snowmelt.

May overwinter under frozen lakes.

Often encountered within a few feet of
water. Tadpoles may require 2 - 4 yrs to
complete their aquatic development.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
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Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Rhaphiomidas
terminatus
abdominalis
Delhi Sands
flower-loving fly
Endangered,
None G1T1, S1
Found only in areas of the Delhi Sands
formation in southwestern San
Bernardino and northwestern Riverside
counties. Requires fine, sandy soils,
often with wholly or partly consolidated
dunes and sparse vegetation.

Oviposition req. shade.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Rhinichthys
gabrielino
Santa Ana
speckled dace
Proposed
Threatened,
None
G5T1, S1,

CDFW-SSC
Headwaters of the Santa Ana and San
Gabriel rivers. May be extirpated from
the Los Angeles River system. Requires
permanent flowing streams with
summer water temps of 17-20 C.

Usually inhabits shallow cobble and
gravel riffles.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Riversidian Alluvial
Fan Sage Scrub
Riversidian
Alluvial Fan Sage
Scrub
None, None G1, S1.1 Coastal scrub This habitat type is absent from the Project site.

Sagittaria sanfordii Sanford's
arrowhead None, None G3, S3,
1B.2
Marshes and swamps. In standing or
slow-moving freshwater ponds,
marshes, and ditches. 0-605 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Senecio
aphanactis
chaparral
ragwort None, None G3, S2,
2B.2
Chaparral, cismontane woodland,
coastal scrub. Drying alkaline flats. 20-
1020 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
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Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Senecio
astephanus
San Gabriel
ragwort None, None G3, S3, 4.3 Chaparral, Coastal scrub Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Southern Riparian
Forest
Southern
Riparian Forest None, None G4, S4 Riparian forest This habitat type is absent from the Project site.

Southern
Sycamore Alder
Riparian Woodland
Southern
Sycamore Alder
Riparian
Woodland
None, None G4, S4 Riparian woodland This habitat type is absent from the Project site.

Spea hammondii western
spadefoot
Proposed
Threatened,
None
G2G3,
S3S4,

CDFW-SSC
Occurs primarily in grassland habitats,
but can be found in valley-foothill
hardwood woodlands. Vernal pools are
essential for breeding and egg-laying.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Sphenopholis
obtusata
prairie wedge
grass None, None G5, S2,
2B.2
Cismontane woodland, meadows and
seeps. Open moist sites, along rivers
and springs, alkaline desert seeps. 15-
2625 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Streptanthus
bernardinus
Laguna
Mountains
jewelflower
None, None G3G4,
S3S4, 4.3
Chaparral, lower montane coniferous
forest. Clay or decomposed granite
soils; sometimes in disturbed areas
such as streamsides or roadcuts. 1440-
2500 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
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Biological Resources Assessment for Hilton Drive Industrial Project Jennings Environmental, LLC P a g e | 32
Scientific Name Common Name Federal/State
Status
Other
Status Habitat Potential to Occur
Symphyotrichum
defoliatum
San Bernardino
aster None, None G2, S2,
1B.2
Meadows and seeps, cismontane
woodland, coastal scrub, lower
montane coniferous forest, marshes
and swamps, valley and foothill
grassland. Vernally mesic grassland or
near ditches, streams and springs;
disturbed areas. 3-2045 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Thamnophis
hammondii
two-striped
gartersnake None, None G4, S3S4,

CDFW-SSC
Coastal California from vicinity of
Salinas to northwest Baja California.

From sea to about 7,000 ft elevation.

Highly aquatic, found in or near
permanent fresh water. Often along
streams with rocky beds and riparian
growth.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Viola pinetorum
ssp. grisea grey-leaved violet None, None G4G5T3,
S3, 1B.2
Subalpine coniferous forest, upper
montane coniferous forest, meadows
and seeps. Dry mountain peaks and
slopes. 1580-3700 m.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.

Vireo bellii pusillus least Bell's vireo Endangered,
Endangered G5T2, S3
Summer resident of Southern California
in low riparian in vicinity of water or in
dry river bottoms; below 2000 ft. Nests
placed along margins of bushes or on
twigs projecting into pathways, usually
willow, Baccharis, mesquite.

Suitable habitat for this species does
not occur on site. As such, this species
is considered absent from the Project
site.
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Coding and Terms

E = Endangered T = Threatened C = Candidate FP = Fully Protected WL = Watch List SSC = Species of Special Concern R = Rare

State Species of Special Concern: An administrative designation given to vertebrate species that appear to be vulnerable to extinction because of declining populations, limited acreages, and/or continuing threats. Raptor and owls are protected under section 3502.5 of the California Fish and Game code: “It is unlawful to take, possess or destroy any birds in the orders Falconiformes or Strigiformes or to take, possess or destroy the nest or eggs of any such bird.”

State Fully Protected: The classification of Fully Protected was the State's initial effort in the 1960's to identify and provide additional protection to those animals that were rare or faced possible extinction. Lists were created for fish, mammals, amphibians and reptiles. Fully Protected species may not be taken or possessed at any time and no licenses or permits may be issued for their take except for collecting these species for necessary scientific research and relocation of the bird species for the protection of livestock.

Global Rankings (Species or Natural Community Level):

G1 = Critically Imperiled – At very high risk of extinction due to extreme rarity (often 5 or fewer populations), very steep declines, or other factors.

G2 = Imperiled – At high risk of extinction due to very restricted range, very few populations (often 20 or fewer), steep declines, or other factors.

G3 = Vulnerable – At moderate risk of extinction due to a restricted range, relatively few populations (often 80 or fewer), recent and widespread declines, or other factors.

G4 = Apparently Secure – Uncommon but not rare; some cause for long-term concern due to declines or other factors.

G5 = Secure – Common; widespread and abundant.
? = Uncertainty in the exact status of an element (could move up or down one direction from current rank)

Subspecies Level: Taxa which are subspecies or varieties receive a taxon rank (T-rank) attached to their G-rank. Where the G-rank reflects the condition of the entire species, the T-rank reflects the global situation of just the subspecies. For example: the Point Reyes mountain beaver, Aplodontia rufa ssp. phaea is ranked G5T2. The G-rank refers to the whole species range i.e., Aplodontia rufa. The T-rank refers only to the global condition of ssp. phaea.

State Ranking:

S1 = Critically Imperiled – Critically imperiled in the State because of extreme rarity (often 5 or fewer populations) or because of factor(s) such as very steep declines making it especially vulnerable to extirpation from the State.

S2 = Imperiled – Imperiled in the State because of rarity due to very restricted range, very few populations (often 20 or fewer), steep declines, or other factors making it very vulnerable to extirpation from the State.

S3 = Vulnerable – Vulnerable in the State due to a restricted range, relatively few populations (often 80 or fewer), recent and widespread declines, or other factors making it vulnerable to extirpation from the State.

S4 = Apparently Secure – Uncommon but not rare in the State; some cause for long-term concern due to declines or other factors.

S5 = Secure – Common, widespread, and abundant in the State.

California Rare Plant Rankings (CNPS List):
1A = Plants presumed extirpated in California and either rare or extinct elsewhere. 1B = Plants rare, threatened, or endangered in California and elsewhere. 2A = Plants presumed extirpated in California, but common elsewhere. 2B = Plants rare, threatened, or endangered in California, but more common elsewhere. 3 = Plants about which more information is needed; a review list. 4 = Plants of limited distribution; a watch list.

Threat Ranks:
.1 = Seriously threatened in California (over 80% of occurrences threatened / high degree and immediacy of threat) .2 = Moderately threatened in California (20-80% occurrences threatened / moderate degree and immediacy of threat) .3 = Not very threatened in California (less than 20% of occurrences threatened / low degree and immediacy of threat or no current threats known) 529

APPENDIX B

TRAFFIC MEMORANDUM

530
transportation ■ noise ■ air quality | GANDDINI GROUP 555 Parkcenter Drive, Suite 225, Santa Ana, California 92705 714 795 3100 | ganddini.com

TECHNICAL MEMORANDUM

TO: Ms. Cheryl Tubbs | LILBURN CORPORATION

FROM: Perrie Ilercil, Senior Engineer | GANDDINI GROUP, INC.

DATE: December 9, 2025

SUBJECT: Hilton Industrial Facility Project (EST24-00008) Transportation Screening Assessment GGI Project No. 19866

Ganddini Group, Inc. is pleased to provide this Transportation Screening Assessment for the Hilton Industrial Facility project in the City of Fontana. The purpose of this memorandum is to determine if the preparation of a traffic impact analysis with level of service (LOS) analysis or vehicle miles traveled (VMT) analysis is necessary based on the transportation study guidelines and screening criteria established by the City of Fontana. We trust the findings of this analysis will aid the City of Fontana in assessing the project.

PROJECT DESCRIPTION

The 4.01-acre project site (APN: 1110-151-03) is located on the northside of Hilton Drive approximately 950 feet east of Redwood Avenue in the City of Fontana, California. The project site is currently vacant and zoned industrial in the West End Specific Plan.

The proposed project involves the development of two warehouse buildings with a total of 71,985 square feet. Vehicle access for the project site is proposed via two driveways onto Hilton Drive. The proposed site plan is shown in Attachment A

TRIP GENERATION

Table 1 shows the proposed project trips based on trip generation rates obtained from the Institute of Transportation Engineers (ITE) Trip Generation Manual (12th Edition, 2025) for Land Use Code 150 (Warehouse).

Truck Trips

The project industrial trip generation was also calculated in terms of Passenger Car Equivalent (PCE) trips. The percentage of truck trips was obtained from the ITE Trip Generation Manual (12th Edition, 2025). The truck mix by axle type was determined based on recommendations for non-cold storage warehouse from the Warehouse Truck Trip Study Results and Usage, by South Coast Air Quality Management District, July 17, 2014.

Truck trips were converted to PCE trips based on the City of Fontana equivalent factors of 2.0 for 2-axle light-duty trucks, 2.5 for 3-axle medium-duty trucks, and 3.0 for 4+-axle heavy-duty trucks.

Project Trips

As shown in Table 1, the proposed project is forecast to approximately 99 daily vehicle trips, including 9 vehicle trips during the AM peak hour and 11 vehicle trips during the PM peak hour which equates to 531

Ms. Cheryl Tubbs
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Transportation Screening Assessment
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approximately 150 daily PCE trips, including 13 PCE trips during the AM peak hour and 15 PCE trips during the PM peak hour.

CRITERIA FOR THE PREPARATION OF TRAFFIC IMPACT ANALYSES

The project has been assessed to determine if the preparation of a traffic impact analysis with level of service (LOS) analysis and vehicle miles traveled (VMT) analysis is necessary based on the criteria established as specified in the City of Fontana Transportation Impact Analysis (TIA) Guidelines for Vehicle Miles Traveled (VMT) and Level of Service Assessment (LOS) (October 2020) [“City TIA Guidelines”].

Level of Service Screening Criteria (General Plan Conformity)

As specified in the City TIA Guidelines, the requirement to prepare a transportation impact study with level of service (LOS) analysis should be based on one or more of the following criteria:

 If a project is forecast to exceed the Congestion Management Program (CMP) threshold of 250 two-way peak hour trips, a traffic impact analysis will be required.  If a project is forecast to generate between 100 and 249 two-way peak hour trips, a traffic impact analysis will be required, but the extent of the analysis will be lesser.  If a project generated between 50 and 100 two-way peak hour trips, a focused traffic analysis will be required.
 If a project generates less than 50 peak hour trips, a traffic analysis report shall not be required, and a trip generation memo will be considered sufficient unless the City has specific concerns related to project access and interaction with adjacent intersections.

The project would generate and contribute fewer than 50 peak hour trips to any intersection of two streets designated as Collector or higher on the City’s General Plan circulation system. The project does not propose any deviation from the City’s TIA Guidelines or design standards. Subject to verification by the City Traffic Engineer, the project does not appear to contribute to unique existing or proposed traffic conditions in the project vicinity to warrant further evaluation. Therefore, the project does not warrant the preparation of a transportation impact study with LOS analysis based on the City-established screening criteria and LOS impacts may be presumed to be negligible.

Vehicle Miles Traveled Screening Criteria (CEQA)

The vehicle miles traveled (VMT) screening assessment has been prepared in accordance with City TIA Guidelines, which were developed based on guidance from the Office of Planning and Research (OPR) Technical Advisory on Evaluating Transportation Impacts in CEQA (State of California, December 2018) [“OPR Technical Advisory”]. In general terms, VMT quantifies the amount and distance of automobile travel attributable to a project or region. The OPR Technical Advisory provides technical considerations regarding methodologies and thresholds with a focus on office, residential, and retail developments as these projects tend to have the greatest influence on VMT.

The City TIA Guidelines identify screening criteria for certain types of projects that typically reduce VMT and may be presumed to result in a less than significant VMT impact. To qualify for VMT screening, the project need only satisfy one of the following screening criteria:

532

Ms. Cheryl Tubbs
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 Projects located within a Transit Priority Area (TPA) □ Projects located within one-half mile radius of a major transit stop 1 or high-quality transit corridor2  Projects located within a low VMT area
□ Site location can be verified with the web-based or map-based VMT Screening Tool 3  Project Type Screening
□ Local-serving retail (less than 50,000 square feet)
□ Projects consisting of land uses which by their nature are local-serving  Project Net Daily trips less than 500 ADT
□ Projects consisting of land uses which by their nature are local-serving □ Projects which generate less than net new 500 daily vehicle trips (ADT)

TPA Screening

Projects located within a TPA, defined as within one-half mile of a major transit stop or high-quality transit corridor, may be presumed to result in a less than significant VMT impact absent substantial evidence to the contrary. The City TIA Guidelines note that this screening criteria may not apply if the project has a floor area ratio (FAR) less than 0.75, the project provides more parking than required by the city, the project is inconsistent with applicable Sustainable Communities Strategy (SCS), or the project constructs a smaller number of moderate or high-income residential units than the existing number of affordable residential units.

Based on a review of the San Bernardino County Transportation Authority (SBCTA) VMT Screening Tool, the proposed project is located within a TPA, is consistent with SCS and parking standards and does not displace residential units; however, the project is below the FAR threshold of 0.75. Therefore, the TPA screening criteria is not met.

Low VMT Area Screening

As prescribed in the City TIA Guidelines, the SBCTA VMT Screening Tool was used to assess low VMT area screening for the project. The VMT Screening Tool was developed using the County travel forecasting model to measure VMT performance for individual jurisdictions and for individual traffic analysis zones (TAZs) within the County transportation region. TAZs are geographic polygons similar to census block groups used to represent areas of homogenous travel behavior. Total daily VMT per service population was estimated for each TAZ. This presumption may not be appropriate if the project land uses would alter the existing built environment in such a way as to increase the rate or length of vehicle trips.

Based on the VMT Screening Tool results for the project site, located within TAZ 53716401, the baseline year (2025) VMT per service population for the project TAZ is equal to 53.3 VMT per service population, which is not less than the City-established threshold based on 15 percent below the San Bernardino County regional average baseline (39.0 VMT). Therefore, the project does not satisfy the City-established screening criteria for projects located in a low VMT area.

1 A major transit stop is defined as an existing rail transit station, ferry terminal with bus or rail service, or the intersection of two or more major bus routes with 20-minute or less headways during the peak commute hours (Pub. Resources Code, § 21064.3 and AB2553). 2 Fixed route bus service with less than 15-minute headways during the peak commute hours (Pub. Resources Code, § 21155). 3 The SBCTA VMT Screening Tool was developed from the San Bernardino Transportation Analysis Model (SBTAM) travel forecasting model to measure VMT performance for individual jurisdictions and for individual traffic analysis zones (TAZs). 533

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Project Type Screening

The City TIA Guidelines identify the several types of projects that may be presumed to have a less than significant VMT impact as they are local serving and thus can be expected to reduce VMT or they are small enough to have a negligible impact:

 Projects consisting of local serving retail (less than 50,000) ▫ Supermarket
▫ Restaurant/café/bar
▫ Coffee/donut shop
▫ Dry cleaners
▫ Barbershop
▫ Hair/nails salon
▫ Walk-in medical clinic
▫ Urgent care
▫ Auto repair/tire shop
▫ Gyms/health club
▫ Dance/yoga/fitness/material arts studio

 Projects consisting of land uses which by their nature are local-serving ▫ Local-serving K-12 schools
▫ Local parks
▫ Day care centers
▫ Local-serving gas stations
▫ Local-serving banks
▫ Local-serving hotels (e.g., non-destination hotels)
▫ Student housing projects on or adjacent to college campuses ▫ Local-serving assembly uses (places of worship, community organizations) ▫ Community institutions (public libraries, fires stations, local government) ▫ Local-serving community colleges that are consistent with the assumptions noted in the RTP/SCS ▫ Affordable or supportive housing
▫ Assisted living facilities
▫ Senior housing (as defined by HUD)

The project does not consist of any of the specified local land use services; therefore, the proposed project does not satisfy the City-established screening criteria for local essential service projects.

Projects with net daily trips less than 500 ADT

Based on a review of greenhouse emissions produced by several types of projects, the City determined that 500 trips would not to cause a less than significant impact under CEQA.:

 Projects generating with less than 5004 daily vehicle trips (ADT) ▫ Single family residential – 52 Dwelling Units or fewer ▫ Multi-family residential – 68 Dwelling Units or fewer ▫ General Office – 51,000 square feet of less
▫ Light Industrial – 100,000 square feet or less

4 This threshold was determined not to exceed 3.000MTCO2e per year as outlined in Appendix B of the City TIA Guidelines. 534

Ms. Cheryl Tubbs
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▫ Warehousing – 287,000 square feet or less
▫ High-Cube Fulfillment Center Warehouse – 357,000 square feet or less

The project consists of 71,985 square feet of warehouse which generates less than 500 daily trips. Therefore, this screening criteria is met, and the project may be presumed to result in a less than significant VMT impact.

ACTIVE TRANSPORTATION AND PUBLIC TRANSIT ANALYSIS

Existing Conditions

The project site is located on the north side of Hilton Drive approximately 950 feet east of Redwood Avenue.

The City of Fontana General Plan Community Mobility and Circulation Element approved and adopted July 23, 2023; shows Hilton Drive is classified as a Collector Street (2+ lanes on up to an 80-foot roadway section).

On-street parking is not restricted along the project frontage. There are no designated bike facilities currently on Hilton Drive; however, there is an existing Class I bike trail north of the site along the Pacific Electric Trail, and there are proposed Class II bike lanes on Foothill Avenue south of the project site and Cherry Avenue west of the project site. Sidewalks are not currently provided along the project frontage; however, there are existing sidewalks to the east and south of the project site. There are no designated transit routes on Hilton Drive; however, Route 66 runs along Foothill Boulevard south of the project site.

Project Conditions

This analysis also assumes the project shall comply with the following conditions as part of the City of Fontana standard development review process to ensure adequate geometric design and emergency access:

 Site-adjacent roadways shall be constructed or repaired at their ultimate half-section width, including landscaping and parkway improvements in conjunction with development, or as otherwise required by the City of Fontana.

 All on-site and off-site roadway design, signing/striping, and traffic control improvements relating to the proposed project shall be submitted to the City for review and constructed following applicable State/Federal engineering standards to the satisfaction of the City of Fontana.

 The final grading, landscaping, and street improvement plans shall demonstrate that applicable sight distance requirements are met.

 The project shall comply with the City of Fontana municipal parking requirements which will be reviewed as a part of the standard development review process.

 Final project plans shall demonstrate adequate emergency vehicle access and circulation to the satisfaction of the City of Fontana Public Works and Fire Departments.

 A construction worksite traffic control plan shall comply with applicable engineering standards outlined in the California Manual of Uniform Traffic Control Devices and shall be submitted to the City for review and approval before the issuance of a grading permit or start of construction. The plan shall identify any roadway, sidewalk, bike route, or bus stop closures and detours as well as haul routes and hours of operation. All construction-related trips shall be restricted to off-peak hours to the extent possible.

The project does not propose any post-construction changes to off-site roadways; therefore, the project 535

Ms. Cheryl Tubbs
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would not conflict with adopted policies, plans, or programs regarding public transit, bicycle, or pedestrian facilities, or otherwise decrease the performance or safety of such facilities. Additionally, the proposed project would be consistent with the City’s Active Transportation Plan by providing a sidewalk along the project’s frontage for greater pedestrian connectivity.

CONCLUSION

The proposed project is forecast to generate approximately 150 daily PCE trips, including 13 PCE trips during the AM peak hour and 15 PCE trips during the PM peak hour.

The proposed project satisfies the City-established LOS screening criteria for projects generating fewer than 50 peak hour trips. Therefore, the proposed project does not warrant the preparation of a transportation impact study with LOS analysis based on the City-established LOS screening criteria.

The proposed project satisfies the City-established vehicle miles traveled (VMT) screening criteria for projects generating less than 500 daily trips. Therefore, preparation of a transportation impact study with VMT analysis is not warranted, and the project may be presumed to result in a less than significant VMT impact.

It has been a pleasure to assist you with this project. Should you have any questions or comments, please contact Perrie Ilercil at (714) 795-3100 ext. 103 or [email protected].

ATTACHMENT

536
Land Use: Warehouse
Size: 71.985 TSF
TRIP GENERATION RATES PER TSF 1
AM Peak Hour PM Peak Hour
In Out Rate In Out Rate
All Vehicles ITE 150 77% 23% 0.120 28% 72% 0.150 1.380
Trucks Only ITE 150 52% 48% 0.020 53% 47% 0.020 0.430
Passenger Car (83.3% AM, 86.7% PM, 68.8% Daily) 0.077 0.023 0.100 0.036 0.094 0.130 0.950 Truck (16.7% AM, 13.3% PM, 31.2% Daily) 0.010 0.010 0.020 0.011 0.009 0.020 0.430 Truck Mix: SCAQMD
2-Axle Trucks (16.7%) 0.002 0.002 0.004 0.002 0.002 0.004 0.072 3-Axle Trucks (20.7%) 0.002 0.002 0.004 0.002 0.002 0.004 0.089 4+ Axle Trucks (62.6%) 0.007 0.006 0.013 0.007 0.006 0.013 0.269 AM Peak Hour PM Peak Hour
In Out Total In Out Total
Passenger Car 6 2 8 3 7 10 68
Trucks
2-Axle Trucks 0.1 0.2 0.3 0.2 0.1 0.3 5
3-Axle Trucks 0.1 0.2 0.3 0.2 0.1 0.3 6
4+ Axle Trucks 0.5 0.4 0.9 0.5 0.4 0.9 19
Subtotal 1 0 1 0 1 1 31
7 2 9 3 8 11 99
Vehicle Type PCE Factor4 AM Peak Hour PM Peak Hour Daily In Out Total In Out Total
Passenger Car 1.0 6 2 8 3 7 10 68
Trucks
2-Axle Trucks 2.0 0 1 1 0 1 1 10
3-Axle Trucks 2.5 0 1 1 1 0 1 15
4+ Axle Trucks 3.0 2 1 3 2 1 3 57
Subtotal 2 3 5 3 2 5 82
8 5 13 6 9 15 150
Notes:

1. TSF = Thousand Square Feet

3. PCE = Passenger Car Equivalent
PCE3 TRIPS GENERATED
Table 1
Project Trip Generation
Vehicle Type Source2
Daily
Rate

VEHICLE TRIPS GENERATED
Vehicle Type Daily
Total Vehicle Trips Generated
Total PCE Trips Generated

2. ITE = Institute of Transportation Engineers Trip Generation Manual (12th Edition, 2025); ### = ITE Land Use Code.

SCAQMD = South Coast Air Quality Management District recommendations for non-cold storage high-cube warehouse.

4. PCE = passenger car equivalent. PCE factors are based on the City of Fontana Traffic Impact Analysis (TIA) Guidelines for Vehicle Miles Traveled (VMT) and Level of Service Assessment (LOS) (October 2020), “Analysis Process Section” Hilton Industrial Facility
Transportation Screening Assessment
19866
7 537

ATTACHMENT A

SITE PLAN
APX-1
538

HILTON DRIVE
BUILDING 1 BUILDING 2
3 3
1 2
6 7
P.L.

R.O.W.

P.L.

P.L.
4 5
TYP. LOW GROUND

COVER PLANTING
WITHIN R.O.W.

PARKWAY PER
LEGEND.

TRANSFORMER LOCATION PER CIVIL PLANS.

PLANT FICUS VINES ALONG WALL TO SCREEN
TRANSFORMER FROM PUBLIC VIEW.

PLANT DOUBLE ROW OF EVERGREEN

SCREEN SHRUBS TO SCREEN PARKING FROM
PUBLIC VIEW.
3:1 MAX. BERM

PER CIVIL PLANS

OBSERVE

CITY'S SIGHT

LINES VIEW
LINE. TYPICAL.

TYP. LOW GROUND

COVER PLANTING
WITHIN R.O.W.

PARKWAY PER
LEGEND.

GRAVEL UNDER

GATE SWING
30'-0"
30'-0"
TREES
SYMBOL TREE NAMEQTY.WUCOLS
*NEW STREET TREE ALONG HILTON DRIVE

PODOCARPUS GRACILIOR, FERN PINE
24" BOX SIZE.
4L

SMALL ACCENT TREE
LAGERSTROEMIA I. 'WATERMELON RED', CRAPE MYRTLE
24" BOX SIZE.
4L

NEW PARKING LOT SHADE TREE

ULMUS PARVIFOLIA 'TRUE GREEN', EVERGREEN ELM
24" BOX SIZE.
14L

VERTICAL TREE ALONG BUILDING/

SECONDARY PARKING LOT TREE

TRISTANIA LAURINA, WATER GUM TREE
15 GAL. SIZE.

ALT: PODOCARPUS GRACILIOR, FERN PINE
9L

EVERGREEN SCREEN TREE

PINUS ELDARICA, MONDELL PINE
36" BOX SIZE.
7L

PLANTING LEGEND
*NOTE: PROPOSED STREET TREES SHALL BE CONSISTANT WITH EXISTING TREES ALONG HILTON DR. TO BE CONFIRMED IN THE FIELD.

TOTAL # OF TREES = 38 TREES
SHRUBS
SHRUBS SHALL BE CHOSEN FROM THE FOLLOWING LIST:WUCOLS

XYLOSMA CONGESTUM, SHINY LEAF XYLOSMA
5 GAL. SIZEL

LEUCOPHYLLUM FRUTESCENS, TEXAS RANGER
5 GAL. SIZEL

WESTRINGIA FRUTICOSA, COAST ROSEMARY
5 GAL. SIZEL

ROSMARINUS 'TUSCAN BLUE', TUSCAN BLUE ROSEMARY
5 GAL. SIZEL

BUXUS JAPONICA, JAPANESE BOXWOOD
5 GAL. SIZEL

GROUND COVER/SHRUB MASSES

GROUND COVER AND SHRUB MASSES SHALL BE CHOSEN FROM THE
FOLLOWING LIST:

WUCOLS

SENECIO MANDRALISCAE, BLUE CHALKSTICKS
1 GAL. SIZE @ 24" O.C.L
ROSMARINUS O. 'PROSTRATUS', CREEPING ROSEMARY
1 GAL. SIZE @ 30" O.C.L

SALVIA GREGGII, AUTUMN SAGE
1 GAL. SIZE @ 36" O.C.L

MUHLENBERGIA RIGENS, DEER GRASS
1 GAL. SIZE @ 42" O.C.L

BACCHARIS PILULARIS, COYOTE BUSH
1 GAL. SIZE @ 42" O.C.L
TYP. LOW GROUND COVER PLANTING WITH PUBLIC R.O.W. (PARKWAY) SUGGEST LANTANA DWARF YELLOW.L

1.NEW SIDEWALK PER CIVIL DWGS.

2.NEW STREET TREE ALONG HILTON DRIVE (MATCH EXISTING)

3.SMALL ACCENT TREE AT PROJECT FOCAL AREAS PER LEGEND

4.TYP. FOUNDATION SHRUB PER LEGEND

5.BROAD CANOPY PARKING LOT SHADE TREE PER LEGEND

6.DROUGHT TOLERANT GROUND COVER AND SHRUB PLANTING PER LEGEND

7.ENHANCED PAVING AT BUILDING ENTRY. INTEGRAL COLORED CONC.

DESIGN KEY NOTES:

VINE
SYMBOL VINE NAMEQTY.WUCOLS

FICUS PUMILA, CREEPING FIG
5 GAL. SIZE @ 3'-0" O.C.5L

WUCOLS PLANT FACTOR

THIS PROJECT IS LOCATED IN 'WUCOLS'
REGION '4-SOUTH INLAND VALLEY'.

H = HIGH WATER NEEDS
M = MODERATE WATER NEEDS
L = LOW WATER NEEDS
VL= VERY LOW WATER NEEDS
·SLOPES GREATER THAN 3:1 SHALL BE STABILIZED WITH EROSION CONTROL GROUND COVER PER

LEGEND, AND MULCH MATERIAL WITH 'BINDER' MATERIAL SHALL BE APPLIED FOR EROSION CONTROL.
·ROCK RIP-RAP MATERIAL SHALL BE INSTALLED WHERE DRAIN LINES CONNECT TO INFILTRATION AREAS.
·ALL UTILITY EQUIPMENT SUCH AS BACKFLOW UNITS, TRANSFORMERS, FIRE DETECTOR CHECKS

AND FIRE CHECK VALVES WILL BE SCREENED WITH EVERGREEN PLANT MATERIAL ONCE FINAL LOCATIONS HAVE BEEN DETERMINED.

GENERAL NOTES:

THIS IS A CONCEPTUAL LANDSCAPE PLAN. IT IS BASED ON PRELIMINARY INFORMATION WHICH IS NOT FULLY VERIFIED AND MAY BE INCOMPLETE. IT IS MEANT AS A COMPARATIVE AID IN

EXAMINING ALTERNATE DEVELOPMENT STRATEGIES AND ANY QUANTITIES INDICATED ARE SUBJECT TO REVISION AS MORE RELIABLE INFORMATION BECOMES AVAILABLE.

IRRIGATION NOTE:

THE PROJECT WILL BE EQUIPPED WITH A LOW FLOW IRRIGATION SYSTEM CONSISTING OF ET

WEATHER BASED SMART CONTROLLER, LOW FLOW ROTORS, BUBBLER AND/ OR DRIP SYSTEMS USED THROUGHOUT. THE IRRIGATION WATER EFFICIENCY WILL MEET OR SURPASS THE CURRENT STATE MANDATED AB-1881 WATER ORDINANCE. PER MUNICIPAL CODE SECTION NO. 9-71(d) ALL

LANDSCAPING AREAS WILL BE PROPERLY IRRIGATED FOR THE LIFE OF THE FACILITY TO ALLOW FOR PLANTS AND TREES TO MAINTAIN GROWTH.

CONCEPTUAL PLAN NOTE:

NORTH
FEBRUARY 12, 2025

HILTON INDUSTRIAL FACILITY

FONTANA, CA

CONCEPTUAL LANDSCAPE PLAN
L-1
80' 40'60' 20' 0'
SCALE: 1" = 20'-0"
ETO FOR FONTANA AREA = 55.6
MAWA (210,969 GALLONS) = 55.6 X 0.62 X 0.45 X 19,560
MAWA (ANNUAL GALLONS ALLOWED) =ETO X 0.62 X ETAF X AREA

PRELIMINARY WATER USE CALCULATIONS
AVERAGE DAILY IRRIGATION WATER USE = 303,423
TOTAL LANDSCAPE AREA = 19,560 SQ. FT.

LANDSCAPE DATA

HILTON LANE, LLC
P.O. BOX 54903
IRVINE, CA 92619
CONTACT: DOUG MCCAN

REQUIRED TREE QUANTITY MATRIX
·TOTAL NUMBER OF PARKING STALLS = 104 STALLS
·TOTAL NUMBER OF TREES REQUIRED AT 1 TREE PER 4 STALLS
106 / 4 = 26 TREES
·TOTAL NUMBER OF TREES PROVIDED = 27 TREES

BASED UPON PROJECT TREE INVENTORY CONDUCTED BY CITY'S

CERTIFIED ARBORIST, THE TALLY OF REPLACEMENT TREES REQUIRED PURSUANT TO FONTANA MUNICIPAL CODE CHAPTER 28, ARTICLE III, SECTION 28-67 IS THIRTY-EIGHT 15-GALLON CONTAINER TREES.

NUMBER OF 15-GALLON TREES PROVIDED ON-SITE = 38 TREES.

PER MUNICIPAL CODE SECTION NO. 9-71(c) ALL LANDSCAPING WILL BE DROUGHT TOLERANT, AND TO THE EXTENT FEASIBLE, SPECIES WITH LOW BIOGENIC EMISSIONS. PALM TREES WILL NOT BE UTILIZED.

PLANTING NOTE:

TOTAL PARKING LOT AREA =16,714 SQ. FT.

TOTAL SHADE AREA REQUIRED WITHIN 15 YRS. = 5,014 SQ. FT.

TOTAL PROJECTED SHADE AREA WITHIN 15 YRS. =5,140 SQ. FT.

PER MUNICIPAL CODE SECTION NO. 9-71(e)
30% OF PARKING STALL AREAS TO BE SHADED WITHIN
15 YEARS AFTER PLANTING

PARKING LOT SHADING CALCULATIONS
APX-2
APX-2
539

APPENDIX C

NOISE IMPACT ANALYSIS

540
Tra!c Engineering # Transporta%on Planning # Parking # Noise & Vibra%on Air Quality # Global Climate Change # Health Risk Assessment

HILTON INDUSTRIAL FACILITY PROJECT

FOCUSED NOISE IMPACT ANALYSIS
City of Fontana
December 23, 2025
541
HIDDEN>

HILTON INDUSTRIAL FACILITY PROJECT

FOCUSED NOISE IMPACT ANALYSIS
City of Fontana
December 23, 2025
prepared by
Roma Stromberg INCE, MS

GANDDINI GROUP INC.
555 Parkcenter Drive, Suite 225
Santa Ana, California 92705
(714) 795-3100 | www.ganddini.com Project No. 19866
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TABLE OF CONTENTS

EXECUTIVE SUMMARY .................................................................................................................................................. II

1. INTRODUCTION .................................................................................................................................................... 1 Purpose and Objectives ................................................................................................................................................. 1 Project Location ............................................................................................................................................................... 1 Project Description .......................................................................................................................................................... 1

2. NOISE FUNDAMENTALS .................................................................................................................................... 4

3. REGULATORY SETTING ...................................................................................................................................... 6 City of Fontana Municipal Code .................................................................................................................................. 6 Federal Transit Administration ..................................................................................................................................... 6 Federal Interagency Committee (FICON) ................................................................................................................. 7

4. ANALYTICAL METHODOLOGY AND MODEL PARAMETERS.................................................................. 9 Construction Noise Modeling ...................................................................................................................................... 9 Vehicle Noise Modeling ................................................................................................................................................. 9

5. CONSTRUCTION NOISE IMPACTS ................................................................................................................ 12 Construction Noise - Onsite ...................................................................................................................................... 12 Construction Noise - Offsite ..................................................................................................................................... 13

6. REFERENCES ......................................................................................................................................................... 15

APPENDICES
Appendix A List of Acronyms
Appendix B Definitions of Acoustical Terms
Appendix C Construction Noise Model Worksheets

LIST OF TABLES
Table 1. FTA Detailed Analysis Construction Noise Criteria .................................................................................... 8 Table 2. CA/T Equipment Noise Emissions and Acoustical Usage Factor Database ...................................... 10 Table 3. Increase in Existing Noise Levels Associated with Project Generated Construction Vehicles................................................................................................................................................................ 14

LIST OF FIGURES
Figure 1. Project Location Map .......................................................................................................................................... 2 Figure 2. Site Plan .................................................................................................................................................................. 3 Figure 3. A-Weighted Comparative Sound Levels ........................................................................................................ 5

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EXECUTIVE SUMMARY

The proposed project involves the development of two warehouse buildings with a total of 71,985 square feet. Vehicle access for the project site is proposed via two driveways onto Hilton Drive.

Project Construction Impacts

Project construction noise levels at nearby sensitive receptors were calculated using the FTA methodology and it was determined that project construction noise levels will not exceed the FTA 90 dBA L eq (8-hour). construction noise standard for impacts to residential land uses. This impact would be less than significant.

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1. INTRODUCTION

This section describes the purpose of this study and the proposed project.

PURPOSE AND OBJECTIVES

The purpose of this report is to provide an assessment of the noise impacts resulting from construction of the proposed project and to identify mitigation measures that may be necessary to reduce those impacts. The noise issues related to the proposed land use and development have been evaluated in light of applicable federal, state and local policies, including those of the City of Fontana in the context of the California Environmental Quality Act (CEQA).

Although this is a technical report, effort has been made to write the report clearly and concisely. A list of acronyms and glossary are provided in Appendix A and Appendix B of this report to assist the reader with technical terms related to noise and vibration analysis.

PROJECT LOCATION

The 4.01-acre project site (APN: 1110-151-03) is located on the northside of Hilton Drive approximately 950 feet east of Redwood Avenue in the City of Fontana, California (See Figure 1). The project site is currently vacant and zoned industrial in the West End Specific Plan.

PROJECT DESCRIPTION

1 545
Figure 1
Project Location Map
Hilton Industrial Facility
Focused Noise Study
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N
Site

HILTON DR

REDWOOD AVE

FOOTHILL BLVD
2 546
Figure 2
Site Plan
Hilton Industrial Facility
Focused Noise Study
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N
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2. NOISE FUNDAMENTALS

Sound is a pressure wave created by a moving or vibrating source that travels through an elastic medium such as air. Noise is defined as unwanted or objectionable sound. The effects of noise on people can include general annoyance, interference with speech communication, sleep disturbance, and in extreme circumstances, hearing impairment.

Commonly used noise terms are presented in Appendix B. The unit of measurement used to describe a noise level is the decibel (dB). The human ear is not equally sensitive to all frequencies within the sound spectrum.

Therefore, the “A-weighted” noise scale, which weights the frequencies to which humans are sensitive, is used for measurements. Noise levels using A-weighted measurements are written dB(A) or dBA.

From the noise source to the receiver, noise changes both in level and frequency spectrum. The most obvious is the decrease in noise as the distance from the source increases. The manner in which noise reduces with distance depends on whether the source is a point or line source as well as ground absorption, atmospheric effects and refraction, and shielding by natural and manmade features. Sound from point sources, such as air conditioning condensers, radiates uniformly outward as it travels away from the source in a spherical pattern.

The noise drop-off rate associated with this geometric spreading is 6 dBA per each doubling of the distance (dBA/DD). Transportation noise sources such as roadways are typically analyzed as line sources, since at any given moment the receiver may be impacted by noise from multiple vehicles at various locations along the roadway. Because of the geometry of a line source, the noise drop-off rate associated with the geometric spreading of a line source is 3 dBA/DD.

Decibels are measured on a logarithmic scale, which quantifies sound intensity in a manner similar to the Richter scale used for earthquake magnitudes. Thus, a doubling of the energy of a noise source, such as a doubled traffic volume, would increase the noise levels by 3 dBA; halving of the energy would result in a 3 dBA decrease.

Figure 3 shows the relationship of various noise levels to commonly experienced noise events.

Average noise levels over a period of minutes or hours are usually expressed as dBA L eq, or the equivalent noise level for that period of time. For example, L eq(8-hr) would represent an 8-hour average. When no period is specified, a one-hour average is assumed.

Noise standards for transportation noise source/land use compatibility are stated in terms of the Community Noise Equivalent Level (CNEL) and the Day-Night Average Noise Level (DNL). CNEL is a 24-hour weighted average measure of community noise. CNEL is obtained by adding five decibels to sound levels in the evening (7:00 PM to 10:00 PM), and by adding ten decibels to sound levels at night (10:00 PM to 7:00 AM). This weighting accounts for the increased human sensitivity to noise during the evening and nighttime hours. DNL is a very similar 24-hour average measure that weights only the nighttime hours.

It is widely accepted that the average healthy ear can barely perceive changes of 3 dBA; that a change of 5 dBA is readily perceptible, and that an increase (decrease) of 10 dBA sounds twice (half) as loud. This definition is recommended by the California Department of Transportation’s Technical Noise Supplement to the Traffic Noise Analysis Protocol (2013).

4 548
Figure 3
A-Weighted Comparative Sound Levels
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© Ganddini Group, Inc.

Based on Policy & Guidance from Federal Aviation Administration 5 549
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3. REGULATORY SETTING

CITY OF FONTANA MUNICIPAL CODE

Section 18-63 Scope, enumeration of prohibited noises.

a. This article shall apply to loud, excessive, impulsive, or intrusive interior and exterior sound or noise that annoys or disturbs persons of ordinary sensibilities emanating from any type of property or source within the city.

b. The following acts, which create loud, excessive, impulsive, or intrusive sound or noise that annoys or disturbs persons of ordinary sensibilities from a distance of 50 feet or more from the edge of the property, structure or unit in which the source is located, are declared to be in violation of this article, but such enumeration shall not be deemed to be exclusive, namely:

 Construction or repairing of buildings or structures. The erection (including excavating), demolition, alteration or repair of any building or structure other than between the hours of 7:00 AM and 6:00 PM on weekdays and between the hours of 8:00 a.m. and 5:00 p.m. on Saturdays, except in case of urgent necessity in the interest of public health and safety, and then only with a permit from the building inspector, which permit may be granted for a period not to exceed three days or less while the emergency continues and which permit may be renewed for periods of three days or less while the emergency continues. If the building inspector should determine that the public health and safety will not be impaired by the erection, demolition, alteration or repair of any building or structure or the excavation of streets and highways within the hours of 6:00 PM and 7:00 AM, and if he shall further determine that loss or inconvenience would result to any party in interest, he may grant permission for such work to be done on weekdays within the hours of 6:00 PM and 7:00 AM, upon application being made at the time the permit for the work is awarded or during the progress of the work.

FEDERAL TRANSIT ADMINISTRATION

IN THE ABSENCE OF LOCAL QUANTITATIVE CONSTRUCTION NOISE THRESHOLDS , THE FEDERAL TRANSIT ADMINISTRATION (FTA) PROVIDES GUIDELINES (FTA 2018) THAT CAN BE CONSIDERED REASONABLE CRITERIA FOR CONSTRUCTION NOISE ASSESSMENT . FTA CONSTRUCTION NOISE STANDARDS ARE PROVIDED IN FEDERAL

INTERAGENCY COMMITTEE (FICON)

The Federal Interagency Committee on Noise (FICON) developed guidance (1992) to be used for the assessment of project-generated permanent increases in noise levels that consider the ambient noise level.

The FICON recommendations are based on studies that relate aircraft noise levels to the percentage of persons highly annoyed by aircraft noise. Although the FICON recommendations were specifically developed to assess aircraft noise impacts, these recommendations are often used in environmental noise impact assessments involving the use of cumulative noise exposure metrics, such as the average-daily noise level (CNEL) and equivalent continuous noise level (Leq). FICON standards as applied to increases due to construction noise would result in a significant impact if:
 Existing noise levels are below 60 dBA, and the project results in a 5 dBA or greater increase; or  Existing noise levels range between 60 and 65 dBA, a the project results in a 3 dBA or greater increase; or
 Existing noise levels exceed 65 dBA, and the project results in an increase of 1.5 dBA or greater..

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Table 1.

FEDERAL INTERAGENCY COMMITTEE (FICON)

7 551
Day Night
Residential 80 70
Commercial 85 85
Industrial 90 90
Source: Federal Transit Administration, Transit Noise and Vibration Impact Assessment Manual, 2018.

Leq,equip(8 hr), dBA
Land Use
Table 1
Detailed Analysis Construction Noise Criteria
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4. ANALYTICAL METHODOLOGY AND MODEL PARAMETERS

This section discusses the analysis methodologies used to assess noise impacts.

CONSTRUCTION NOISE MODELING

Construction noise will vary depending on the construction process, type of equipment involved, location of the construction site with respect to sensitive receptors, the schedule proposed to carry out each task (e.g., hours and days of the week) and the duration of the construction work.

Construction noise associated with the proposed project was calculated at the sensitive receptor locations utilizing methodology presented in the Federal Transit Administration (FTA) Transit Noise and Vibration Impact Assessment Manual (2018) together with several key construction parameters, including: distance to each sensitive receiver, equipment usage, percent usage factor, and baseline parameters for the project site.

Distances to receptors were based on the acoustical center of the project site.

The equipment used to calculate the construction noise levels for each phase were based on the assumptions provided in the CalEEMod modeling. Sound emission levels associated with typical construction equipment as well as typical usage factors are provided in. Construction noise worksheets are provided in Appendix C.

VEHICLE NOISE MODELING

Noise associated with existing traffic volumes and existing plus project construction volumes was modeled using spreadsheets that use the FHWA Traffic Noise Prediction Model (FHWA-RD-77-108) formulas. The FHWA model arrives at the predicted noise level through a series of adjustments to the Reference Energy Mean Emission Level (REMEL). Key model parameters and REMEL adjustments are presented below:

 Roadway classification (e.g., freeway, major arterial, arterial, secondary, collector, etc.),  Roadway active width (distance between the center of the outer most travel lanes on each side of  the roadway),
 Average Daily Traffic (ADT) Volumes, Travel Speeds, Percentages of automobiles, medium trucks and  heavy trucks,
 Roadway grade and angle of view,
 Site conditions (e.g., soft vs. hard), and
 Percentage of total ADT which flows each hour throughout a 24-hour period.

Traffic noise levels were calculated at the right-of-way based on distance from the centerline of the analyzed roadway. The modeling is theoretical and does not take into account any existing barriers, structures, and/or topographical features that may further reduce noise levels. Therefore, the modeled noise levels are shown for comparative purposes only to show the difference between with and without project conditions. Traffic noise calculation worksheets are included in Appendix D.

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Table 2 (1 of 2)
CA/T Equipment Noise Emissions and Acoustical Usage Factor Database Equipment Description
Impact
Device?
Acoustical
Use Factor (%)
Spec. Lmax
@ 50ft
(dBA, slow)
Actual
Measured
Lmax @ 50ft
(dBA, slow)
No. of Actual
Data Samples
(Count)
All Other Equipment > 5 HP No 50 85 -N/A- 0
Auger Drill Rig No 20 85 84 36
Backhoe No 40 80 78 372
Bar Bender No 20 80 -N/A- 0
Blasting Yes -N/A- 94 -N/A- 0
Boring Jack Power Unit No 50 80 83 1
Chain Saw No 20 85 84 46
Clam Shovel (dropping) Yes 20 93 87 4
Compactor (ground) No 20 80 83 57
Compressor (air) No 40 80 78 18
Concrete Batch Plant No 15 83 -N/A- 0
Concrete Mixer Truck No 40 85 79 40
Concrete Pump Truck No 20 82 81 30
Concrete Saw No 20 90 90 55
Crane No 16 85 81 405
Dozer No 40 85 82 55
Drill Rig Truck No 20 84 79 22
Drum Mixer No 50 80 80 1
Dump Truck No 40 84 76 31
Excavator No 40 85 81 170
Flat Bed Truck No 40 84 74 4
Forklift2,3 No 50 n/a 61 n/a
Front End Loader No 40 80 79 96
Generator No 50 82 81 19
Generator (<25KVA, VMS signs) No 50 70 73 74
Gradall No 40 85 83 70
Grader No 40 85 -N/A- 0
Grapple (on backhoe) No 40 85 87 1
Horizontal Boring Hydr. Jack No 25 80 82 6
Hydra Break Ram Yes 10 90 -N/A- 0
Impact Pile Driver Yes 20 95 101 11
Jackhammer Yes 20 85 89 133
Man Lift No 20 85 75 23
Mounted Impact hammer (hoe ram) Yes 20 90 90 212
Pavement Scarafier No 20 85 90 2
Paver No 50 85 77 9
Pickup Truck No 50 85 77 9
Paving Equipment No 50 85 77 9
Pneumatic Tools No 50 85 85 90
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Table 2 (2 of 2)
CA/T Equipment Noise Emissions and Acoustical Usage Factor Database Equipment Description
Impact
Device?
Acoustical
Use Factor (%)
Spec. Lmax
@ 50ft
(dBA, slow)
Actual
Measured
Lmax @ 50ft
(dBA, slow)
No. of Actual
Data Samples
(Count)
Pumps No 50 77 81 17
Refrigerator Unit No 100 82 73 3
Rivit Buster/chipping gun Yes 20 85 79 19
Rock Drill No 20 85 81 3
Roller No 20 85 80 16
Sand Blasting (Single Nozzle) No 20 85 96 9
Scraper No 40 85 84 12
Shears (on backhoe) No 40 85 96 5
Slurry Plant No 100 78 78 1
Slurry Trenching Machine No 50 82 80 75
Soil Mix Drill Rig No 50 80 -N/A- 0
Tractor No 40 84 -N/A- 0
Vacuum Excavator (Vac-truck) No 40 85 85 149
Vacuum Street Sweeper No 10 80 82 19
Ventilation Fan No 100 85 79 13
Vibrating Hopper No 50 85 87 1
Vibratory Concrete Mixer No 20 80 80 1
Vibratory Pile Driver No 20 95 101 44
Warning Horn No 5 85 83 12
Welder/Torch No 40 73 74 5
Notes:
(1) Source: FHWA Roadway Construction Noise Model User's Guide January 2006. (2) Warehouse & Forklift Noise Exposure - NoiseTesting.info Carl Stautins, November 4, 2014 http://www.noisetesting.info/blog/carl-strautins/page-3/ (3) Data provided Leq as measured at the operator. Sound Level at 50 feet is calculated using Inverse Square Law.

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5. CONSTRUCTION NOISE IMPACTS

CONSTRUCTION NOISE - ONSITE

The City of Fontana has set restrictions to control noise impacts associated with the construction of the proposed project. According to Section 18-63[b][7] of the city’s Municipal Code, Construction or repairing of buildings or structures, construction activity is limited: between the hours of 7:00 a.m. and 6:00 p.m. on weekdays and between the hours of 8:00 a.m. and 5:00 p.m. on Saturdays except in the case of urgent necessity. Project construction noise levels are, therefore, considered exempt from municipal regulation if activities occur within the hours specified in the City of Fontana Municipal Code, Section 18-63[7] of 7:00 a.m. to 6:00 p.m. on weekdays and between the hours of 8:00 a.m. to 5:00 p.m. on Saturdays. However, neither the General Plan nor the Municipal Code establish numeric maximum acceptable construction source noise levels at potentially affected receivers for CEQA analysis purposes. Therefore, a numerical construction threshold based on Federal Transit Administration (FTA) Transit Noise and Vibration Impact Assessment Manual is used for analysis of daytime construction impacts, as discussed below. According to the FTA, local noise ordinances are typically not very useful in evaluating construction noise. They usually relate to nuisance and hours of allowed activity, and sometimes specify limits in terms of maximum levels, but are generally not practical for assessing the impact of a construction project. Project construction noise criteria should account for the existing noise.

AS SHOWN IN FEDERAL INTERAGENCY COMMITTEE (FICON)

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Table 1, the FTA considers a daytime exterior construction noise level of 80 dBA L eq(8-hour) for noise sensitive residential land uses, 85 dBA L eq(8-hour) for commercial uses, and 90 dBA L eq(8-hour) for industrial uses.

Construction noise would affect adjacent light industrial/warehouse land uses. Therefore, the proposed project would result in a significant impact if it:

 Results in noise levels that exceed 90 dBA Leq (8-hour) at the property line of an existing industrial land use.

Project construction noise levels at nearby sensitive receptors were calculated using the FTA methodology.

Construction noise modeling worksheets for each phase are provided in Appendix C. Modeled construction noise levels reach up to 70.7 dBA L eq at the property line shared with the industrial warehouse land use to the north, up to 68.5 dBA L eq at the property line shared with the industrial land use to the south, and up to

77.9 dBA L eq at the industrial properties located to the east and west. Project construction noise levels will not exceed the FTA 90 dBA L eq (8-hour) construction noise standard for impacts to residential land uses. This impact would be less than significant.

CONSTRUCTION NOISE - OFFSITE

As shown in Table 3, existing noise levels range between 62.9 and 65.6 dBA CNEL and existing plus project construction noise levels would range between 63.2 and 65.7 dBA CNEL. Project construction traffic would result in a less than 1 dB increase along both roadways and would not exceed the applicable FICON noise increase thresholds. Impacts would be less than significant and no mitigation measures are required.

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Existing Noise Level1 Existing Plus Project Increase
Applicable
Threhsold2
Hemlock Ave 62.9 63.2 0.3 3 No
Redwood Ave 65.6 65.7 0.1 1.5 No
Notes:
dBA, CNEL

1. Measured Existing Noise Levels (Appendix D). The measured Leq was converted to CNEL.

2. FICON Thresholds as presented in Section 3.

Table 3
Increase in Existing Noise Levels Associated with Project Generated Construction Vehicles Exceeds Threshold?Roadway
Hilton Industrial Facility Project
Focused Noise Impact Analysis
19866
14 558
Hilton Industrial Facility Project
Focused Noise Impact Analysis
15 19866

6. REFERENCES

Fontana, City of
Municipal Code 1863(b)(2)
2018 Fontana Forward General Plan Update 2015-2035 Draft Environmental Impact Report. June 8. 2018 Fontana Forward General Plan Update 2015-2035. November 13.

Lilburn Corporation
2025 Hilton Industrial Facility CalEEMod Construction Modeling Output

U.S. Federal Transit Administration (FTA)
2018 Transit Noise and Vibration Impact Assessment Manual. Typical Construction Equipment Vibration Emissions.

U.S. Department of Transportation
2006 FHWA Roadway Construction Noise Model User’s Guide. January.

15 559
Hilton Industrial Facility Project
Focused Noise Impact Analysis
16 19866

APPENDICES

Appendix A List of Acronyms
Appendix B Definitions of Acoustical Terms
Appendix C Construction Noise Model Worksheets
Appendix D FHWA Construction Vehicle Noise Worksheets
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APPENDIX A

LIST OF ACRONYMS
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Term Definition
ADT
ANSI
CEQA
CNEL
D/E/N
dB
dBA or dB(A)
dBA/DD
dBA Leq
EPA
FHWA
L02,L08,L50,L90

DNL
Leq(x)
Leq
Lmax
Lmin
Lp
LOS C
Lw
OPR
PPV
RCNM
REMEL
RMS
Average Daily Traffic
American National Standard Institute
California Environmental Quality Act
Community Noise Equivalent Level
Day / Evening / Night
Decibel
Decibel "A-Weighted"
Decibel per Double Distance
Average Noise Level over a Period of Time
Environmental Protection Agency
Federal Highway Administration
A-weighted Noise Levels at 2 percent, 8 percent, 50 percent, and 90 percent, respectively, of the time period
Day-Night Average Noise Level
Equivalent Noise Level for '"x" period of time
Equivalent Noise Level
Maximum Level of Noise (measured using a sound level meter) Minimum Level of Noise (measured using a sound level meter) Sound Pressure Level
Level of Service C
Sound Power Level
California Governor's Office of Planning and Research
Peak Particle Velocities
Road Construction Noise Model
Reference Energy Mean Emission Level
Root Mean Square
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APPENDIX B

DEFINITIONS OF ACOUSTICAL TERMS
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Term Definition
Ambient Noise
Level
The all-encompassing noise environment associated with a given environment, at a specified time, usually a composite of sound from many sources, at many directions, near and far, in which usually no particular sound is dominant.

A-Weighted Sound
Level, dBA
The sound level obtained by use of A-weighting. The A-weighting filter de-emphasizes the very low and very high frequency components of the sound in a manner similar to the frequency response of the human ear.

CNEL
Community Noise Equivalent Level. CNEL is a weighted 24-hour noise level that is obtained by adding five decibels to sound levels in the evening (7:00 PM to 10:00 PM), and by adding ten decibels to sound levels at night (10:00 PM to 7:00 AM). This weighting accounts for the increased human sensitivity to noise during the evening and nighttime hours.

Decibel, dB
A logarithmic unit of noise level measurement that relates the energy of a noise source to that of a constant reference level; the number of decibels is 10 times the logarithm (to the base 10) of this ratio.

DNL, Ldn
Day Night Level. The DNL, or Ldn is a weighted 24-hour noise level that is obtained by adding ten decibels to sound levels at night (10:00 PM to 7:00 AM). This weighting accounts for the increased human sensitivity to noise during the nighttime hours.

Equivalent
Continuous Noise
Level, Leq
A level of steady state sound that in a stated time period, and a stated location, has the same A-weighted sound energy as the time-varying sound.

Fast/Slow Meter
Response
The fast and slow meter responses are different settings on a sound level meter. The fast response setting takes a measurement every 100 milliseconds, while a slow setting takes one every second.

Frequency, Hertz In a function periodic in time, the number of times that the quantity repeats itself in one second (i.e., the number of cycles per second).

L02, L08, L50, L90 The A-weighted noise levels that are equaled or exceeded by a fluctuating sound level, 2 percent, 8 percent, 50 percent, and 90 percent of a stated time period, respectively.

Lmax, Lmin
Lmax is the RMS (root mean squared) maximum level of a noise source or environment measured on a sound level meter, during a designated time interval, using fast meter response. Lmin is the minimum level.

Offensive/
Offending/Intrusive
Noise
The noise that intrudes over and above the existing ambient noise at a given location.

The relative intrusiveness of sound depends on its amplitude, duration, frequency, and time of occurrence, and tonal information content as well as the prevailing ambient noise level.

Root Mean Square
(RMS)
A measure of the magnitude of a varying noise source quantity. The name derives from the calculation of the square root of the mean of the squares of the values. It can be calculated from either a series of lone values or a continuous varying function.

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APPENDIX C

CONSTRUCTION NOISE MODEL WORKSHEETS

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Construction Phase Equipment Item # of Items Item Lmax at 50 feet, dBA1 Distance to Receptor3 Item Usage Percent Usage Factor Dist. Correction dB Usage Adj. dB Receptor Item Lmax, dBA Receptor Item Leq, dBA Rubber Tired Dozers 3 82 323 40 1.20 -16.2 0.8 65.8 66.6 Tractors/Loaders/Backhoes 4 84 323 40 1.60 -16.2 2.0 67.8 69.8 Log Sum 69.8
Excavator 1 85 323 40 0.40 -16.2 -4.0 68.8 64.8
Graders 1 85 323 40 0.40 -16.2 -4.0 68.8 64.8
Rubber Tired Dozers 1 82 323 40 0.40 -16.2 -4.0 65.8 61.8 Tractors/Loaders/Backhoes 3 84 323 40 1.20 -16.2 0.8 67.8 68.6 Log Sum 70.7
Cranes 1 81 323 16 0.16 -16.2 -8.0 64.8 56.8
Forklifts2
3 48 323 40 1.20 -16.2 0.8 31.8 32.6
Generator Sets 1 81 323 50 0.50 -16.2 -3.0 64.8 61.8
Tractors/Loaders/Backhoes 1 84 323 40 0.40 -16.2 -4.0 67.8 63.8 Welders 1 73 323 40 0.40 -16.2 -4.0 56.8 52.8
Log Sum 66.6
Tractors/Loaders/Backhoes 1 84 323 40 0.40 -16.2 -4.0 67.8 63.8 Pavers 1 77 323 50 0.50 -16.2 -3.0 60.8 57.8
Paving Equipment 2 77 323 50 1.00 -16.2 0.0 60.8 60.8
Rollers 2 80 323 20 0.40 -16.2 -4.0 63.8 59.8
Cement and Mortar Mixers 2 80 323 20 0.40 -16.2 -4.0 63.8 59.8 Log Sum 64.4
Air Compressors 1 78 323 40 0.40 -16.2 -4.0 61.8 57.8
Log Sum 57.8
Notes:
(1) Source: Referenced noise levels from the Federal Transit Administration (FTA) Transit Noise and Vibration Impact Assessment Manual (September 2018) and the FHWA Roadway Construction Noise Model User's Guide (January 2006) (2) Source: SoundPLAN reference list.
(3) Distance to receptor calculated from center of site. Construction noise projected from the center of the project site to nearest sensitive use (property line).

Architectural Coating
Paving
Receptor - Warehouse Land Use to the North
Site Preparation
Grading
Building Construction
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Construction Phase Equipment Item # of Items Item Lmax at 50 feet, dBA1 Distance to Receptor3 Item Usage Percent Usage Factor Dist. Correction dB Usage Adj. dB Receptor Item Lmax, dBA Receptor Item Leq, dBA Rubber Tired Dozers 3 82 415 40 1.20 -18.4 0.8 63.6 64.4 Tractors/Loaders/Backhoes 4 84 415 40 1.60 -18.4 2.0 65.6 67.7 Log Sum 67.7
Excavator 1 85 415 40 0.40 -18.4 -4.0 66.6 62.6
Graders 1 85 415 40 0.40 -18.4 -4.0 66.6 62.6
Rubber Tired Dozers 1 82 415 40 0.40 -18.4 -4.0 63.6 59.6 Tractors/Loaders/Backhoes 3 84 415 40 1.20 -18.4 0.8 65.6 66.4 Log Sum 68.5
Cranes 1 81 415 16 0.16 -18.4 -8.0 62.6 54.7
Forklifts2
3 48 415 40 1.20 -18.4 0.8 29.6 30.4
Generator Sets 1 81 415 50 0.50 -18.4 -3.0 62.6 59.6
Tractors/Loaders/Backhoes 1 84 415 40 0.40 -18.4 -4.0 65.6 61.6 Welders 1 73 415 40 0.40 -18.4 -4.0 54.6 50.6
Log Sum 64.4
Tractors/Loaders/Backhoes 1 84 415 40 0.40 -18.4 -4.0 65.6 61.6 Pavers 1 77 415 50 0.50 -18.4 -3.0 58.6 55.6
Paving Equipment 2 77 415 50 1.00 -18.4 0.0 58.6 58.6
Rollers 2 80 415 20 0.40 -18.4 -4.0 61.6 57.6
Cement and Mortar Mixers 2 80 415 20 0.40 -18.4 -4.0 61.6 57.6 Log Sum 62.2
Air Compressors 1 78 415 40 0.40 -18.4 -4.0 59.6 55.6
Log Sum 55.6
Notes:
(1) Source: Referenced noise levels from the Federal Transit Administration (FTA) Transit Noise and Vibration Impact Assessment Manual (September 2018) and the FHWA Roadway Construction Noise Model User's Guide (January 2006) (2) Source: SoundPLAN reference list.
(3) Distance to receptor calculated from center of site. Construction noise projected from the center of the project site to nearest sensitive use (property line).

Paving
Light Industrial Land Use to the South
Site Preparation
Grading
Building Construction
Architectural Coating
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Construction Phase Equipment Item # of Items Item Lmax at 50 feet, dBA1 Distance to Receptor3 Item Usage Percent Usage Factor Dist. Correction dB Usage Adj. dB Receptor Item Lmax, dBA Receptor Item Leq, dBA Rubber Tired Dozers 3 82 141 40 1.20 -9.0 0.8 73.0 73.8 Tractors/Loaders/Backhoes 4 84 141 40 1.60 -9.0 2.0 75.0 77.0 Log Sum 77.0
Excavator 1 85 141 40 0.40 -9.0 -4.0 76.0 72.0
Graders 1 85 141 40 0.40 -9.0 -4.0 76.0 72.0
Rubber Tired Dozers 1 82 141 40 0.40 -9.0 -4.0 73.0 69.0 Tractors/Loaders/Backhoes 3 84 141 40 1.20 -9.0 0.8 75.0 75.8 Log Sum 77.9
Cranes 1 81 141 16 0.16 -9.0 -8.0 72.0 64.0
Forklifts2
3 48 141 40 1.20 -9.0 0.8 39.0 39.8
Generator Sets 1 81 141 50 0.50 -9.0 -3.0 72.0 69.0
Tractors/Loaders/Backhoes 1 84 141 40 0.40 -9.0 -4.0 75.0 71.0 Welders 1 73 141 40 0.40 -9.0 -4.0 64.0 60.0
Log Sum 73.8
Tractors/Loaders/Backhoes 1 84 141 40 0.40 -9.0 -4.0 75.0 71.0 Pavers 1 77 141 50 0.50 -9.0 -3.0 68.0 65.0
Paving Equipment 2 77 141 50 1.00 -9.0 0.0 68.0 68.0
Rollers 2 80 141 20 0.40 -9.0 -4.0 71.0 67.0
Cement and Mortar Mixers 2 80 141 20 0.40 -9.0 -4.0 71.0 67.0 Log Sum 71.6
Air Compressors 1 78 141 40 0.40 -9.0 -4.0 69.0 65.0
Log Sum 65.0
Notes:
(1) Source: Referenced noise levels from the Federal Transit Administration (FTA) Transit Noise and Vibration Impact Assessment Manual (September 2018) and the FHWA Roadway Construction Noise Model User's Guide (January 2006) (2) Source: SoundPLAN reference list.
(3) Distance to receptor calculated from center of site. Construction noise projected from the center of the project site to nearest sensitive use (property line).

Paving
Receptor - Light Industrial Land Uses to the East and West Site Preparation
Grading
Building Construction
Architectural Coating
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APPENDIX D

FHWA CONSTRUCTION VEHICLE NOISE WORKSHEETS

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FHWA Sound32 Spreadsheet
Existing Traffic Noise
Project: Hilton Ave Industrial
Road: Hemlock Ave
Segment: Hilton Avenue to Foothill Boulevard
DAYTIME EVENING NIGHTTIME ADT 124.00
AUTOS M.TRUCKS H.TRUCKS AUTOS M.TRUCKS H.TRUCKS AUTOS M.TRUCKS H.TRUCKS SPEED 35.00 -------------------------------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- DISTANCE 30.00

INPUT PARAMETERS
Vehicles per hour 7.85 0.18 11.53 5.23 0.04 1.44 1.30 0.03 1.92 % A 98 Speed in MPH 35.00 35.00 35.00 35.00 35.00 35.00 35.00 35.00 35.00 Left angle -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 Right angle 90.00 90.00 90.00 90.00 90.00 90.00 90.00 90.00 90.00 % MT 2

NOISE CALCULATIONS
Reference levels 65.11 74.83 80.05 65.11 74.83 80.05 65.11 74.83 80.05 % HT 129

ADJUSTMENTS
Flow 3.20 -13.31 4.87 1.43 -19.67 -4.16 -4.62 -21.22 -2.91 Distance 2.15 2.15 2.15 2.15 2.15 2.15 2.15 2.15 2.15 LEFT -90.00 Finite Roadway 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 RIGHT 90.00 Barrier 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Grade 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 CNEL 62.89 Constant -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 DAY LEQ 62.18 LEQ 45.46 38.67 62.07 43.69 32.31 53.03 37.64 30.76 54.28 Day hour 89.00 Absorbtive? no
DAY LEQ 62.18 EVENING LEQ 53.54 NIGHT LEQ 54.39 Use hour? no GRADE dB 0.00
CNEL 62.89
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FHWA Sound32 Spreadsheet
Existing Plus Project Traffic Noise
Project: Hilton Ave Industrial
Road: Hemlock Ave
Segment: Hilton Avenue to Foothill Boulevard
DAYTIME EVENING NIGHTTIME ADT 167.00
AUTOS M.TRUCKS H.TRUCKS AUTOS M.TRUCKS H.TRUCKS AUTOS M.TRUCKS H.TRUCKS SPEED 35.00 -------------------------------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- DISTANCE 30.00

INPUT PARAMETERS
Vehicles per hour 9.85 0.18 12.40 6.56 0.04 1.55 1.63 0.03 2.06 % A 91.33 Speed in MPH 35.00 35.00 35.00 35.00 35.00 35.00 35.00 35.00 35.00 Left angle -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 Right angle 90.00 90.00 90.00 90.00 90.00 90.00 90.00 90.00 90.00 % MT 1.49

NOISE CALCULATIONS
Reference levels 65.11 74.83 80.05 65.11 74.83 80.05 65.11 74.83 80.05 % HT 102.97

ADJUSTMENTS
Flow 4.19 -13.31 5.19 2.42 -19.67 -3.85 -3.63 -21.22 -2.60 Distance 2.15 2.15 2.15 2.15 2.15 2.15 2.15 2.15 2.15 LEFT -90.00 Finite Roadway 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 RIGHT 90.00 Barrier 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Grade 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 CNEL 63.22 Constant -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 DAY LEQ 62.51 LEQ 46.45 38.67 62.38 44.68 32.31 53.34 38.63 30.76 54.59 Day hour 89.00 Absorbtive? no
DAY LEQ 62.51 EVENING LEQ 53.93 NIGHT LEQ 54.72 Use hour? no GRADE dB 0.00
CNEL 63.22
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FHWA Sound32 Spreadsheet
Existing Traffic Noise
Project: Hilton Ave Industrial
Road: Redwood Ave
Segment: Hilton Avenue to Foothill Boulevard
DAYTIME EVENING NIGHTTIME ADT 232.00
AUTOS M.TRUCKS H.TRUCKS AUTOS M.TRUCKS H.TRUCKS AUTOS M.TRUCKS H.TRUCKS SPEED 35.00 -------------------------------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- DISTANCE 30.00

INPUT PARAMETERS
Vehicles per hour 14.68 0.33 21.57 9.78 0.08 2.69 2.43 0.05 3.59 % A 98 Speed in MPH 35.00 35.00 35.00 35.00 35.00 35.00 35.00 35.00 35.00 Left angle -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 Right angle 90.00 90.00 90.00 90.00 90.00 90.00 90.00 90.00 90.00 % MT 2

NOISE CALCULATIONS
Reference levels 65.11 74.83 80.05 65.11 74.83 80.05 65.11 74.83 80.05 % HT 129

ADJUSTMENTS
Flow 5.92 -10.59 7.59 4.16 -16.95 -1.44 -1.90 -18.50 -0.19 Distance 2.15 2.15 2.15 2.15 2.15 2.15 2.15 2.15 2.15 LEFT -90.00 Finite Roadway 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 RIGHT 90.00 Barrier 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Grade 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 CNEL 65.61 Constant -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 DAY LEQ 64.90 LEQ 48.18 41.39 64.79 46.41 35.03 55.75 40.36 33.48 57.00 Day hour 89.00 Absorbtive? no
DAY LEQ 64.90 EVENING LEQ 56.26 NIGHT LEQ 57.11 Use hour? no GRADE dB 0.00
CNEL 65.61
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FHWA Sound32 Spreadsheet
Existing Plus Project Traffic Noise
Project: Hilton Ave Industrial
Road: Redwood Ave
Segment: Hilton Avenue to Foothill Boulevard
DAYTIME EVENING NIGHTTIME ADT 275.00
AUTOS M.TRUCKS H.TRUCKS AUTOS M.TRUCKS H.TRUCKS AUTOS M.TRUCKS H.TRUCKS SPEED 35.00 -------------------------------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- ----------------------- DISTANCE 30.00

INPUT PARAMETERS
Vehicles per hour 2.00 0.33 22.44 1.33 0.08 2.80 0.33 0.05 3.74 % A 11.27 Speed in MPH 35.00 35.00 35.00 35.00 35.00 35.00 35.00 35.00 35.00 Left angle -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 -90.00 Right angle 90.00 90.00 90.00 90.00 90.00 90.00 90.00 90.00 90.00 % MT 1.69

NOISE CALCULATIONS
Reference levels 65.11 74.83 80.05 65.11 74.83 80.05 65.11 74.83 80.05 % HT 113.19

ADJUSTMENTS
Flow -2.73 -10.59 7.76 -4.50 -16.95 -1.27 -10.55 -18.50 -0.02 Distance 2.15 2.15 2.15 2.15 2.15 2.15 2.15 2.15 2.15 LEFT -90.00 Finite Roadway 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 RIGHT 90.00 Barrier 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Grade 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 CNEL 65.69 Constant -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 -25.00 DAY LEQ 64.99 LEQ 39.53 41.39 64.96 37.76 35.03 55.92 31.71 33.48 57.17 Day hour 89.00 Absorbtive? no
DAY LEQ 64.99 EVENING LEQ 56.02 NIGHT LEQ 57.20 Use hour? no GRADE dB 0.00
CNEL 65.69
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Noise Measurement
Field Data
Project Name: Hilton Industrial Facility, City of Fontana Date:

Project #:

Noise Measurement #: Technician:

Weather: Settings: SLOW FAST
Temperature: 58 deg F Wind: 4 mph Humidity: 64% Terrain:

Start Time: 2:03 PM End Time: 2:18 PM Run Time:

Leq: 62.2 dB Traffic noise from the 33 vehicles passing STNM2 microphone travelling N-S Lmax 78.7 dB on Hemlock Ave.

L2 72.1 dB Traffic noise from traffic travelling E-W on Foothill Blvd. DMV building has an L8 65.4 dB outside " Now serving… " PA anouncing system. Distant train horns.

L25 59.0 dB
L50 54.7 dB
NOISE METER: CALIBRATOR:

MAKE: MAKE:

MODEL: MODEL:

SERIAL NUMBER: SERIAL NUMBER:

FACTORY CALIBRATION DATE:

FIELD CALIBRATION DATE:

November 20, 2025
Ian Edward Gallagher
Nearest Address or Cross Street: 8025 Hemlock Avenue, Fontana, CA 92336 STNM2 Run Time 15 minutes
19866
Primary Noise Source:

Secondary Noise Sources:

Flat
Site Description (Type of Existing Land Use and any other notable features):

SoundTrack LXT Class 1
Overcast. Sunset: 4:43 PM
Larson Davis CAL 250
Project Site: Eastern sidewalk outside apparent multifamily trailer park.

Adjacent: Hemlock Ave running N-S just W of STNM2, Foothill Blvd running E-W, 460' S of STNM2. DMV with outside announcing system 390' W of STNM2. 7/10/20247/31/2024
11/20/2025
FACTORY CALIBRATION DATE:

Larson Davis
LXT1
3099
Larson Davis
CAL 250
2723
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Noise Measurement
Field Data
PHOTOS:

Project Site: Eastern sidewalk outside apparent multifamily trailer park.

STNM2 looking SE from Hemlock Avenue sidewalk towards entry/exit way to STNM2 looking SW across Hemlock Avenue towards entry/exit to parking multifamily trailor park 8025 Hemlock Avenue, Fontana. lot of building 8026 Hemlock Avenue, Fontana.

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Noise Measurement
Field Data
Project Name: Hilton Industrial Facility, City of Fontana Date:

Project #:

Noise Measurement #: Technician:

Weather: Settings: SLOW FAST
Temperature: 58 deg F Wind: 4 mph Humidity: 64% Terrain:

Start Time: 3:13 PM End Time: 3:28 PM Run Time:

Leq: 64.9 dB Traffic noise from 36 vehicles passing STNM4 microphone, travelling N-S along Lmax 79.7 dB Redwood Ave. Traffic noise from Foothill Blvd running E-W , 240' S of STNM4.

L2 73.9 dB Bird song, leaf rustle fom 4mph breeze. Some residential ambiance. Distant L8 69.9 dB train horns. Overhead commercial airtraffic (Ontario Airport 9 miles WSW) L25 64.3 dB
L50 59.3 dB
NOISE METER: CALIBRATOR:

MAKE: MAKE:

MODEL: MODEL:

SERIAL NUMBER: SERIAL NUMBER:

FACTORY CALIBRATION DATE:

FIELD CALIBRATION DATE:
7/10/20247/31/2024
11/20/2025
FACTORY CALIBRATION DATE:

Larson Davis
LXT1
3099
Larson Davis
CAL 250
2723
Primary Noise Source:

Secondary Noise Sources:

Flat
Site Description (Type of Existing Land Use and any other notable features):

SoundTrack LXT Class 1
Overcast. Sunset: 4:43 PM
Larson Davis CAL 250
Project Site: Western edge of N-S bound Redwood Ave ( no sidewalk ) outside residence 8080 Redwood Ave. Adjacent: Foothill Blvd running E-W, 240' S of STNM4. Mixture of businesse & older residences in area.

November 20, 2025
Ian Edward Gallagher
Nearest Address or Cross Street: 8080 Redwood Avenue, Fontana, CA 92336 STNM4 Run Time 15 minutes
19866
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Noise Measurement
Field Data
PHOTOS:

STNM4 looking S towards Redwood Avenue & Foothill Boulevard ( traffic lights STNM4 looking NE across Redwood Avenue towards building 8047 Redwood 240' S ), residence 8080 Redwood Avenue, Fontana on the right. Avenue ( left ) & the remains ( demolished ) of what use to be residence 8055 Redwood Avenue, Fontana ( right ).

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GANDDINI GROUP INC.

714.795.3100 | ganddini.com
586

APPENDIX D

CALEEMOD DETAILED REPORT

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Hilton Warehouses 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. Site Preparation (2026) - Unmitigated

3.3. Grading (2026) - Unmitigated

3.5. Building Construction (2026) - Unmitigated

3.7. Building Construction (2027) - Unmitigated

3.9. Paving (2027) - Unmitigated
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3.11. Architectural Coating (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

4.8. Stationary Emissions By Equipment Type
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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

5.6.1. Construction Earthmoving Activities
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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

5.14.1. Unmitigated
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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

6.4. Climate Risk Reduction Measures
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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
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1. Basic Project Information

1.1. Basic Project Information
Data Field Value
Project Name Hilton Warehouses
Construction Start Date 1/1/2026
Operational Y ear 2026
Lead Agency —
Land Use Scale Project/site
Analysis Level for Defaults County
Windspeed (m/s) 2.80
Precipitation (days) 6.40
Location 34.10931147833928, -117.4809929555013
County San Bernardino-South Coast
City Fontana
Air District South Coast AQMD
Air Basin South Coast
TAZ 5304
EDFZ 10
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
General Light
Industry

73.5 1000sqft 4.00 73,550 19,560 — — —
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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. 1.46 1.21 10.4 15.4 0.03 0.38 0.51 0.89 0.35 0.12 0.48 — 3,189 3,189 0.14 0.09 2.42 3,222 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 38.1 38.0 29.2 29.8 0.05 1.24 7.89 9.14 1.14 3.99 5.14 — 5,519 5,519 0.22 0.09 0.06 5,540 Average
Daily
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 1.94 1.93 7.17 10.1 0.02 0.27 0.49 0.75 0.25 0.16 0.41 — 2,099 2,099 0.09 0.06 0.66 2,119 Annual
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 0.35 0.35 1.31 1.83 < 0.005 0.05 0.09 0.14 0.05 0.03 0.07 — 347 347 0.01 0.01 0.11 351

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)
— — — — — — — — — — — — — — — — — —
2026 1.46 1.21 10.4 15.4 0.03 0.38 0.51 0.89 0.35 0.12 0.48 — 3,189 3,189 0.14 0.09 2.42 3,222 595
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Daily -
Winter
(Max)
— — — — — — — — — — — — — — — — — —
2026 3.82 3.21 29.2 29.8 0.05 1.24 7.89 9.14 1.14 3.99 5.14 — 5,519 5,519 0.22 0.09 0.06 5,540 2027 38.1 38.0 9.91 14.7 0.03 0.34 0.51 0.85 0.32 0.12 0.44 — 3,139 3,139 0.13 0.09 0.06 3,169 Average
Daily
— — — — — — — — — — — — — — — — — —
2026 1.00 0.83 7.17 10.1 0.02 0.27 0.49 0.75 0.25 0.16 0.41 — 2,099 2,099 0.09 0.06 0.66 2,119 2027 1.94 1.93 0.48 0.76 < 0.005 0.02 0.02 0.04 0.02 0.01 0.02 — 132 132 < 0.005 < 0.005 0.04 133 Annual — — — — — — — — — — — — — — — — — —
2026 0.18 0.15 1.31 1.83 < 0.005 0.05 0.09 0.14 0.05 0.03 0.07 — 347 347 0.01 0.01 0.11 351 2027 0.35 0.35 0.09 0.14 < 0.005 < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 — 21.9 21.9 < 0.005 < 0.005 0.01 22.1

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. 2.42 2.33 0.88 3.92 0.01 0.07 < 0.005 0.07 0.07 < 0.005 0.07 81.7 2,223 2,305 8.42 0.09 19.2 2,562 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 1.85 1.81 0.85 0.72 0.01 0.06 < 0.005 0.07 0.06 < 0.005 0.07 81.7 2,210 2,292 8.42 0.09 19.1 2,548 Average
Daily
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 2.24 2.17 0.87 2.91 0.01 0.07 < 0.005 0.07 0.07 < 0.005 0.07 81.7 2,219 2,301 8.42 0.09 19.2 2,558 Annual
(Max)
— — — — — — — — — — — — — — — — — —
Unmit. 0.41 0.40 0.16 0.53 < 0.005 0.01 < 0.005 0.01 0.01 < 0.005 0.01 13.5 367 381 1.39 0.02 3.17 423 596
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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 < 0.005 < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 5.61 5.61 < 0.005 < 0.005 0.03 5.82 Area 2.33 2.29 0.03 3.20 < 0.005 0.01 — 0.01 < 0.005 — < 0.005 — 13.2 13.2 < 0.005 < 0.005 — 13.2 Energy 0.09 0.05 0.85 0.71 0.01 0.06 — 0.06 0.06 — 0.06 — 2,033 2,033 0.15 0.01 — 2,040 Water — — — — — — — — — — — 32.6 171 204 3.35 0.08 — 312 Waste — — — — — — — — — — — 49.2 0.00 49.2 4.91 0.00 — 172 Refrig. — — — — — — — — — — — — — — — — 19.1 19.1
Total 2.42 2.33 0.88 3.92 0.01 0.07 < 0.005 0.07 0.07 < 0.005 0.07 81.7 2,223 2,305 8.42 0.09 19.2 2,562 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Mobile < 0.005 < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 5.54 5.54 < 0.005 < 0.005 < 0.005 5.73 Area 1.76 1.76 — — — — — — — — — — — — — — — —
Energy 0.09 0.05 0.85 0.71 0.01 0.06 — 0.06 0.06 — 0.06 — 2,033 2,033 0.15 0.01 — 2,040 Water — — — — — — — — — — — 32.6 171 204 3.35 0.08 — 312 Waste — — — — — — — — — — — 49.2 0.00 49.2 4.91 0.00 — 172 Refrig. — — — — — — — — — — — — — — — — 19.1 19.1
Total 1.85 1.81 0.85 0.72 0.01 0.06 < 0.005 0.07 0.06 < 0.005 0.07 81.7 2,210 2,292 8.42 0.09 19.1 2,548 Average
Daily
— — — — — — — — — — — — — — — — — —
Mobile < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 5.55 5.55 < 0.005 < 0.005 0.01 5.75 Area 2.15 2.12 0.02 2.19 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 9.01 9.01 < 0.005 < 0.005 — 9.04 Energy 0.09 0.05 0.85 0.71 0.01 0.06 — 0.06 0.06 — 0.06 — 2,033 2,033 0.15 0.01 — 2,040 Water — — — — — — — — — — — 32.6 171 204 3.35 0.08 — 312 Waste — — — — — — — — — — — 49.2 0.00 49.2 4.91 0.00 — 172597 Hilton Warehouses Detailed Report, 7/30/2025
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Refrig. — — — — — — — — — — — — — — — — 19.1 19.1
Total 2.24 2.17 0.87 2.91 0.01 0.07 < 0.005 0.07 0.07 < 0.005 0.07 81.7 2,219 2,301 8.42 0.09 19.2 2,558 Annual — — — — — — — — — — — — — — — — — —
Mobile < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.92 0.92 < 0.005 < 0.005 < 0.005 0.95 Area 0.39 0.39 < 0.005 0.40 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 1.49 1.49 < 0.005 < 0.005 — 1.50 Energy 0.02 0.01 0.15 0.13 < 0.005 0.01 — 0.01 0.01 — 0.01 — 337 337 0.03 < 0.005 — 338 Water — — — — — — — — — — — 5.40 28.3 33.7 0.56 0.01 — 51.6 Waste — — — — — — — — — — — 8.14 0.00 8.14 0.81 0.00 — 28.5 Refrig. — — — — — — — — — — — — — — — — 3.17 3.17
Total 0.41 0.40 0.16 0.53 < 0.005 0.01 < 0.005 0.01 0.01 < 0.005 0.01 13.5 367 381 1.39 0.02 3.17 423

3. Construction Emissions Details

3.1. 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

3.74 3.14 29.2 28.8 0.05 1.24 — 1.24 1.14 — 1.14 — 5,298 5,298 0.21 0.04 — 5,316 Dust
From
Material
Movement
— — — — — — 7.67 7.67 — 3.94 3.94 — — — — — — —
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0.000.000.000.000.000.00—0.000.000.000.000.000.000.000.000.000.000.00Onsite truck
Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.05 0.04 0.40 0.39 < 0.005 0.02 — 0.02 0.02 — 0.02 — 72.6 72.6 < 0.005 < 0.005 — 72.8 Dust
From
Material
Movement
— — — — — — 0.11 0.11 — 0.05 0.05 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 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

0.01 0.01 0.07 0.07 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 12.0 12.0 < 0.005 < 0.005 — 12.1 Dust
From
Material
Movement
— — — — — — 0.02 0.02 — 0.01 0.01 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 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 0.08 0.95 0.00 0.00 0.23 0.23 0.00 0.05 0.05 — 222 222 < 0.005 0.01 0.02 224 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 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 0.00 599
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——————————————————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 — 3.08 3.08 < 0.005 < 0.005 < 0.005 3.12 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 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 — 0.51 0.51 < 0.005 < 0.005 < 0.005 0.52 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 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

3.3. Grading (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

1.96 1.65 15.0 17.4 0.03 0.65 — 0.65 0.59 — 0.59 — 2,960 2,960 0.12 0.02 — 2,970 Dust
From
Material
Movement
— — — — — — 2.76 2.76 — 1.34 1.34 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 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
— — — — — — — — — — — — — — — — — —
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65.1—< 0.005< 0.00564.964.9—0.01—0.010.01—0.01< 0.0050.380.330.040.04Off-Roa d
Dust
From
Material
Movement
— — — — — — 0.06 0.06 — 0.03 0.03 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 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

0.01 0.01 0.06 0.07 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 10.7 10.7 < 0.005 < 0.005 — 10.8 Dust
From
Material
Movement
— — — — — — 0.01 0.01 — 0.01 0.01 — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 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 0.07 0.82 0.00 0.00 0.20 0.20 0.00 0.05 0.05 — 190 190 < 0.005 0.01 0.02 192 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 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 < 0.005 < 0.005 < 0.005 0.02 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 4.22 4.22 < 0.005 < 0.005 0.01 4.28 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 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 — — — — — — — — — — — — — — — — — — 601
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Worker < 0.005 < 0.005 < 0.005 < 0.005 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.70 0.70 < 0.005 < 0.005 < 0.005 0.71 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 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

3.5. Building Construction (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)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

1.28 1.07 9.85 13.0 0.02 0.38 — 0.38 0.35 — 0.35 — 2,397 2,397 0.10 0.02 — 2,405 Onsite
truck

0.00 0.00 0.00 0.00 0.00 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

1.28 1.07 9.85 13.0 0.02 0.38 — 0.38 0.35 — 0.35 — 2,397 2,397 0.10 0.02 — 2,405 Onsite
truck

0.00 0.00 0.00 0.00 0.00 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

0.79 0.66 6.09 8.02 0.01 0.23 — 0.23 0.22 — 0.22 — 1,482 1,482 0.06 0.01 — 1,488 Onsite
truck

0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 602
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Annual — — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.14 0.12 1.11 1.46 < 0.005 0.04 — 0.04 0.04 — 0.04 — 245 245 0.01 < 0.005 — 246 Onsite
truck

0.00 0.00 0.00 0.00 0.00 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 0.15 0.13 0.12 2.22 0.00 0.00 0.40 0.40 0.00 0.09 0.09 — 426 426 0.02 0.01 1.46 433 Vendor 0.04 0.01 0.40 0.21 < 0.005 0.01 0.10 0.11 0.01 0.03 0.03 — 366 366 0.03 0.06 0.97 384 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 0.14 0.12 0.14 1.68 0.00 0.00 0.40 0.40 0.00 0.09 0.09 — 391 391 0.01 0.02 0.04 396 Vendor 0.04 0.01 0.41 0.22 < 0.005 0.01 0.10 0.11 0.01 0.03 0.03 — 366 366 0.03 0.06 0.03 383 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 0.09 0.08 0.09 1.09 0.00 0.00 0.25 0.25 0.00 0.06 0.06 — 245 245 < 0.005 0.01 0.39 249 Vendor 0.02 < 0.005 0.26 0.13 < 0.005 < 0.005 0.06 0.07 < 0.005 0.02 0.02 — 226 226 0.02 0.03 0.26 237 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 0.02 0.01 0.02 0.20 0.00 0.00 0.05 0.05 0.00 0.01 0.01 — 40.6 40.6 < 0.005 < 0.005 0.06 41.1 Vendor < 0.005 < 0.005 0.05 0.02 < 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 < 0.005 — 37.4 37.4 < 0.005 0.01 0.04 39.3 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

3.7. Building Construction (2027) - Unmitigated
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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

1.23 1.03 9.39 12.9 0.02 0.34 — 0.34 0.31 — 0.31 — 2,397 2,397 0.10 0.02 — 2,405 Onsite
truck

0.00 0.00 0.00 0.00 0.00 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

0.02 0.01 0.13 0.18 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 32.8 32.8 < 0.005 < 0.005 — 32.9 Onsite
truck

0.00 0.00 0.00 0.00 0.00 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
< 0.005 < 0.005 0.02 0.03 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 5.44 5.44 < 0.005 < 0.005 — 5.46 Onsite
truck

0.00 0.00 0.00 0.00 0.00 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)
— — — — — — — — — — — — — — — — — —
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——————————————————Daily,
Winter
(Max)
Worker 0.13 0.12 0.12 1.56 0.00 0.00 0.40 0.40 0.00 0.09 0.09 — 383 383 0.01 0.01 0.03 388 Vendor 0.03 0.01 0.40 0.21 < 0.005 0.01 0.10 0.11 0.01 0.03 0.03 — 359 359 0.03 0.05 0.02 376 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 < 0.005 < 0.005 < 0.005 0.02 0.00 0.00 0.01 0.01 0.00 < 0.005 < 0.005 — 5.32 5.32 < 0.005 < 0.005 0.01 5.39 Vendor < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 4.92 4.92 < 0.005 < 0.005 0.01 5.15 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 Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 < 0.005 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 0.88 0.88 < 0.005 < 0.005 < 0.005 0.89 Vendor < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.81 0.81 < 0.005 < 0.005 < 0.005 0.85 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. Paving (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)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.79 0.66 6.09 8.83 0.01 0.24 — 0.24 0.22 — 0.22 — 1,350 1,350 0.05 0.01 — 1,355 Paving 0.00 0.00 — — — — — — — — — — — — — — — —
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0.000.000.000.000.000.00—0.000.000.000.000.000.000.000.000.000.000.00Onsite truck
Average
Daily
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.04 0.03 0.30 0.44 < 0.005 0.01 — 0.01 0.01 — 0.01 — 66.6 66.6 < 0.005 < 0.005 — 66.8 Paving 0.00 0.00 — — — — — — — — — — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 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

0.01 0.01 0.05 0.08 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 11.0 11.0 < 0.005 < 0.005 — 11.1 Paving 0.00 0.00 — — — — — — — — — — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 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 0.09 0.08 0.08 1.01 0.00 0.00 0.26 0.26 0.00 0.06 0.06 — 248 248 < 0.005 0.01 0.02 251 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 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 < 0.005 < 0.005 < 0.005 0.05 0.00 0.00 0.01 0.01 0.00 < 0.005 < 0.005 — 12.4 12.4 < 0.005 < 0.005 0.02 12.6 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 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 0.00 606
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Annual — — — — — — — — — — — — — — — — — —
Worker < 0.005 < 0.005 < 0.005 0.01 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 2.05 2.05 < 0.005 < 0.005 < 0.005 2.08 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 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. Architectural Coating (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)
— — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Off-Roa
d
Equipm
ent

0.14 0.11 0.83 1.13 < 0.005 0.02 — 0.02 0.02 — 0.02 — 134 134 0.01 < 0.005 — 134 Architect
ural
Coating
s

37.9 37.9 — — — — — — — — — — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 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

0.01 0.01 0.04 0.06 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 6.58 6.58 < 0.005 < 0.005 — 6.61 Architect
ural
Coating
s

1.87 1.87 — — — — — — — — — — — — — — — —
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Onsite
truck

0.00 0.00 0.00 0.00 0.00 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
< 0.005 < 0.005 0.01 0.01 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 1.09 1.09 < 0.005 < 0.005 — 1.09 Architect
ural
Coating
s

0.34 0.34 — — — — — — — — — — — — — — — —
Onsite
truck

0.00 0.00 0.00 0.00 0.00 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 0.03 0.02 0.02 0.31 0.00 0.00 0.08 0.08 0.00 0.02 0.02 — 76.6 76.6 < 0.005 < 0.005 0.01 77.6 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 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 < 0.005 < 0.005 < 0.005 0.02 0.00 0.00 < 0.005 < 0.005 0.00 < 0.005 < 0.005 — 3.83 3.83 < 0.005 < 0.005 0.01 3.88 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 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 — 0.63 0.63 < 0.005 < 0.005 < 0.005 0.64 Vendor 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 — 0.00 0.00 0.00 0.00 0.00 0.00 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 0.00 608
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4. Operations Emissions Details

4.1. Mobile Emissions by Land Use

4.1.1. 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)
— — — — — — — — — — — — — — — — — —
General
Light
Industry
< 0.005 < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 5.61 5.61 < 0.005 < 0.005 0.03 5.82 Total < 0.005 < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 5.61 5.61 < 0.005 < 0.005 0.03 5.82 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
General
Light
Industry
< 0.005 < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 5.54 5.54 < 0.005 < 0.005 < 0.005 5.73 Total < 0.005 < 0.005 < 0.005 0.01 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 5.54 5.54 < 0.005 < 0.005 < 0.005 5.73 Annual — — — — — — — — — — — — — — — — — —
General
Light
Industry
< 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.92 0.92 < 0.005 < 0.005 < 0.005 0.95 Total < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 < 0.005 — 0.92 0.92 < 0.005 < 0.005 < 0.005 0.95

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) 609
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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)
— — — — — — — — — — — — — — — — — —
General
Light
Industry
— — — — — — — — — — — — 1,022 1,022 0.06 0.01 — 1,026
Total — — — — — — — — — — — — 1,022 1,022 0.06 0.01 — 1,026 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
General
Light
Industry
— — — — — — — — — — — — 1,022 1,022 0.06 0.01 — 1,026
Total — — — — — — — — — — — — 1,022 1,022 0.06 0.01 — 1,026 Annual — — — — — — — — — — — — — — — — — —
General
Light
Industry
— — — — — — — — — — — — 169 169 0.01 < 0.005 — 170
Total — — — — — — — — — — — — 169 169 0.01 < 0.005 — 170

4.2.3. Natural Gas 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)
— — — — — — — — — — — — — — — — — —
General
Light
Industry

0.09 0.05 0.85 0.71 0.01 0.06 — 0.06 0.06 — 0.06 — 1,011 1,011 0.09 < 0.005 — 1,014 Total 0.09 0.05 0.85 0.71 0.01 0.06 — 0.06 0.06 — 0.06 — 1,011 1,011 0.09 < 0.005 — 1,014 610
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——————————————————Daily,
Winter
(Max)
General
Light
Industry

0.09 0.05 0.85 0.71 0.01 0.06 — 0.06 0.06 — 0.06 — 1,011 1,011 0.09 < 0.005 — 1,014 Total 0.09 0.05 0.85 0.71 0.01 0.06 — 0.06 0.06 — 0.06 — 1,011 1,011 0.09 < 0.005 — 1,014 Annual — — — — — — — — — — — — — — — — — —
General
Light
Industry

0.02 0.01 0.15 0.13 < 0.005 0.01 — 0.01 0.01 — 0.01 — 167 167 0.01 < 0.005 — 168 Total 0.02 0.01 0.15 0.13 < 0.005 0.01 — 0.01 0.01 — 0.01 — 167 167 0.01 < 0.005 — 168

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

1.57 1.57 — — — — — — — — — — — — — — — —
Architect
ural
Coating
s

0.19 0.19 — — — — — — — — — — — — — — — —
Landsca
pe
Equipm
ent

0.57 0.53 0.03 3.20 < 0.005 0.01 — 0.01 < 0.005 — < 0.005 — 13.2 13.2 < 0.005 < 0.005 — 13.2 Total 2.33 2.29 0.03 3.20 < 0.005 0.01 — 0.01 < 0.005 — < 0.005 — 13.2 13.2 < 0.005 < 0.005 — 13.2 611
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——————————————————Daily,
Winter
(Max)
Consum
er
Product
s

1.57 1.57 — — — — — — — — — — — — — — — —
Architect
ural
Coating
s

0.19 0.19 — — — — — — — — — — — — — — — —
Total 1.76 1.76 — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Consum
er
Product
s

0.29 0.29 — — — — — — — — — — — — — — — —
Architect
ural
Coating
s

0.03 0.03 — — — — — — — — — — — — — — — —
Landsca
pe
Equipm
ent

0.07 0.07 < 0.005 0.40 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 1.49 1.49 < 0.005 < 0.005 — 1.50 Total 0.39 0.39 < 0.005 0.40 < 0.005 < 0.005 — < 0.005 < 0.005 — < 0.005 — 1.49 1.49 < 0.005 < 0.005 — 1.50

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)
— — — — — — — — — — — — — — — — — —
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General
Light
Industry
— — — — — — — — — — — 32.6 171 204 3.35 0.08 — 312
Total — — — — — — — — — — — 32.6 171 204 3.35 0.08 — 312 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
General
Light
Industry
— — — — — — — — — — — 32.6 171 204 3.35 0.08 — 312
Total — — — — — — — — — — — 32.6 171 204 3.35 0.08 — 312 Annual — — — — — — — — — — — — — — — — — —
General
Light
Industry
— — — — — — — — — — — 5.40 28.3 33.7 0.56 0.01 — 51.6
Total — — — — — — — — — — — 5.40 28.3 33.7 0.56 0.01 — 51.6

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)
— — — — — — — — — — — — — — — — — —
General
Light
Industry
— — — — — — — — — — — 49.2 0.00 49.2 4.91 0.00 — 172
Total — — — — — — — — — — — 49.2 0.00 49.2 4.91 0.00 — 172 Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
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172—0.004.9149.20.0049.2———————————General
Light
Industry
Total — — — — — — — — — — — 49.2 0.00 49.2 4.91 0.00 — 172 Annual — — — — — — — — — — — — — — — — — —
General
Light
Industry
— — — — — — — — — — — 8.14 0.00 8.14 0.81 0.00 — 28.5
Total — — — — — — — — — — — 8.14 0.00 8.14 0.81 0.00 — 28.5

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) 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)
— — — — — — — — — — — — — — — — — —
General
Light
Industry
— — — — — — — — — — — — — — — — 19.1 19.1
Total — — — — — — — — — — — — — — — — 19.1 19.1
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
General
Light
Industry
— — — — — — — — — — — — — — — — 19.1 19.1
Total — — — — — — — — — — — — — — — — 19.1 19.1
Annual — — — — — — — — — — — — — — — — — —
General
Light
Industry
— — — — — — — — — — — — — — — — 3.17 3.17
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Total — — — — — — — — — — — — — — — — 3.17 3.17

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
Type
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 — — — — — — — — — — — — — — — — — —

4.8. 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
Type
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 — — — — — — — — — — — — — — — — — —
615
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——————————————————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
Type
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. 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 616
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——————————————————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)
— — — — — — — — — — — — — — — — — —
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)
— — — — — — — — — — — — — — — — — —
617
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Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —
Daily,
Winter
(Max)
— — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —
Annual — — — — — — — — — — — — — — — — — —
Avoided — — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Sequest
ered
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
Remove
d
— — — — — — — — — — — — — — — — — —
Subtotal — — — — — — — — — — — — — — — — — —
— — — — — — — — — — — — — — — — — — —
618
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5. Activity Data

5.1. Construction Schedule
Phase Name Phase Type Start Date End Date Days Per Week Work Days per Phase Phase Description Site Preparation Site Preparation 1/30/2026 2/6/2026 5.00 5.00 — Grading Grading 2/7/2026 2/18/2026 5.00 8.00 —
Building Construction Building Construction 2/19/2026 1/7/2027 5.00 230 — Paving Paving 1/8/2027 2/2/2027 5.00 18.0 —
Architectural Coating Architectural Coating 2/3/2027 2/28/2027 5.00 18.0 —

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 Site Preparation Rubber Tired Dozers Diesel Average 3.00 8.00 367 0.40 Site Preparation Tractors/Loaders/Back
hoes
Diesel Average 4.00 8.00 84.0 0.37
Grading Excavators Diesel Average 1.00 8.00 36.0 0.38
Grading Graders Diesel Average 1.00 8.00 148 0.41
Grading Rubber Tired Dozers Diesel Average 1.00 8.00 367 0.40 Grading Tractors/Loaders/Back
hoes
Diesel Average 3.00 8.00 84.0 0.37
Building Construction Cranes Diesel Average 1.00 7.00 367 0.29 Building Construction Forklifts Diesel Average 3.00 8.00 82.0 0.20 Building Construction Generator Sets Diesel Average 1.00 8.00 14.0 0.74 Building Construction Tractors/Loaders/Back
hoes
Diesel Average 3.00 7.00 84.0 0.37
Building Construction Welders Diesel Average 1.00 8.00 46.0 0.45 619
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0.5610.06.002.00AverageDieselPaving Cement and Mortar
Mixers
Paving Pavers Diesel Average 1.00 8.00 81.0 0.42
Paving Paving Equipment Diesel Average 2.00 6.00 89.0 0.36 Paving Rollers Diesel Average 2.00 6.00 36.0 0.38
Paving Tractors/Loaders/Back
hoes
Diesel Average 1.00 8.00 84.0 0.37
Architectural Coating Air Compressors Diesel Average 1.00 6.00 37.0 0.48

5.3. Construction Vehicles

5.3.1. Unmitigated
Phase Name Trip Type One-Way Trips per Day Miles per Trip Vehicle Mix Site Preparation — — — —
Site Preparation Worker 17.5 18.5 LDA,LDT1,LDT2
Site Preparation Vendor — 10.2 HHDT,MHDT
Site Preparation Hauling 0.00 20.0 HHDT
Site Preparation Onsite truck — — HHDT
Grading — — — —
Grading Worker 15.0 18.5 LDA,LDT1,LDT2
Grading Vendor — 10.2 HHDT,MHDT
Grading Hauling 0.00 20.0 HHDT
Grading Onsite truck — — HHDT
Building Construction — — — —
Building Construction Worker 30.9 18.5 LDA,LDT1,LDT2
Building Construction Vendor 12.1 10.2 HHDT,MHDT
Building Construction Hauling 0.00 20.0 HHDT
Building Construction Onsite truck — — HHDT
Paving — — — —
620
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Paving Worker 20.0 18.5 LDA,LDT1,LDT2
Paving Vendor — 10.2 HHDT,MHDT
Paving Hauling 0.00 20.0 HHDT
Paving Onsite truck — — HHDT
Architectural Coating — — — —
Architectural Coating Worker 6.18 18.5 LDA,LDT1,LDT2
Architectural Coating Vendor — 10.2 HHDT,MHDT
Architectural Coating Hauling 0.00 20.0 HHDT
Architectural Coating 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)
Architectural Coating 0.00 0.00 110,325 36,775 —

5.6. Dust Mitigation

5.6.1. Construction Earthmoving Activities
Phase Name Material Imported (cy) Material Exported (cy) Acres Graded (acres) Material Demolished (sq. ft.) Acres Paved (acres) Site Preparation — — 7.50 0.00 —
Grading — — 8.00 0.00 —
Paving 0.00 0.00 0.00 0.00 0.00

5.6.2. Construction Earthmoving Control Strategies
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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
General Light Industry 0.00 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 General Light
Industry
128 128 128 46,685 1,714 1,714 1,714 625,486

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)
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0 0.00 110,325 36,775 —

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) General Light Industry 701,500 532 0.0330 0.0040 3,154,274

5.12. Operational Water and Wastewater Consumption

5.12.1. Unmitigated
Land Use Indoor Water (gal/year) Outdoor Water (gal/year) General Light Industry 17,008,438 314,116

5.13. Operational Waste Generation

5.13.1. Unmitigated
Land Use Waste (ton/year) Cogeneration (kWh/year)
General Light Industry 91.2 —

5.14. Operational Refrigeration and Air Conditioning Equipment 623
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5.14.1. Unmitigated
Land Use Type Equipment Type Refrigerant GWP Quantity (kg) Operations Leak Rate Service Leak Rate Times Serviced General Light Industry Other commercial A/C
and heat pumps
R-410A 2,088 0.30 4.00 4.00 18.0

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

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

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 624
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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 21.7 annual days of extreme heat Extreme Precipitation 5.25 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 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 received 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. 625
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6.2. Initial Climate Risk Scores
Climate Hazard Exposure Score Sensitivity Score Adaptive Capacity Score Vulnerability Score Temperature and Extreme Heat 2 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 greatest 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 2 1 1 3
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 greatest exposure.
626
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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 97.0
AQ-PM 91.2
AQ-DPM 44.6
Drinking Water 66.7
Lead Risk Housing 17.7
Pesticides 0.00
Toxic Releases 70.1
Traffic 22.7
Effect Indicators —
CleanUp Sites 0.00
Groundwater 0.00
Haz Waste Facilities/Generators 87.1
Impaired Water Bodies 0.00
Solid Waste 0.00
Sensitive Population —
Asthma 35.5
Cardio-vascular 74.9
Low Birth Weights 90.0 627
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Socioeconomic Factor Indicators —
Education 67.1
Housing 32.3
Linguistic 42.1
Poverty 46.6
Unemployment 60.6

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 73.87398948
Employed 66.08494803
Median HI 76.97934043
Education —
Bachelor's or higher 33.61991531
High school enrollment 16.64314128
Preschool enrollment 6.954959579
Transportation —
Auto Access 81.29090209
Active commuting 28.82073656
Social —
2-parent households 63.10791736
Voting 37.89298088
Neighborhood —
Alcohol availability 69.81906839
Park access 24.90696779
Retail density 29.59065828
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Supermarket access 48.50506865
Tree canopy 11.20236109
Housing —
Homeownership 87.77107661
Housing habitability 74.22045425
Low-inc homeowner severe housing cost burden 66.09778006 Low-inc renter severe housing cost burden 33.49159502
Uncrowded housing 67.80443988
Health Outcomes —
Insured adults 47.32452201
Arthritis 87.4
Asthma ER Admissions 59.8
High Blood Pressure 83.5
Cancer (excluding skin) 80.0
Asthma 58.2
Coronary Heart Disease 90.3
Chronic Obstructive Pulmonary Disease 88.0
Diagnosed Diabetes 65.9
Life Expectancy at Birth 84.7
Cognitively Disabled 85.7
Physically Disabled 88.8
Heart Attack ER Admissions 27.3
Mental Health Not Good 56.0
Chronic Kidney Disease 79.8
Obesity 44.4
Pedestrian Injuries 39.5
Physical Health Not Good 65.0
Stroke 88.3
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Health Risk Behaviors —
Binge Drinking 15.4
Current Smoker 63.1
No Leisure Time for Physical Activity 61.9
Climate Change Exposures —
Wildfire Risk 0.0
SLR Inundation Area 0.0
Children 45.9
Elderly 96.3
English Speaking 60.3
Foreign-born 41.2
Outdoor Workers 55.6
Climate Change Adaptive Capacity —
Impervious Surface Cover 52.6
Traffic Density 33.7
Traffic Access 23.0
Other Indices —
Hardship 49.3
Other Decision Support —
2016 Voting 49.9

7.3. Overall Health & Equity Scores
Metric Result for Project Census Tract
CalEnviroScreen 4.0 Score for Project Location (a) 58.0 Healthy Places Index Score for Project Location (b) 51.0 Project Located in a Designated Disadvantaged Community (Senate Bill 535) No Project Located in a Low-Income Community (Assembly Bill 1550) No Project Located in a Community Air Protection Program Community (Assembly Bill 617) No 630
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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
Land Use Per Site Plan
Construction: Construction Phases Project Site is Vacant.

Operations: Vehicle Data Per Project Traffic Memorandum Operations: Fleet Mix Project Traffic Memorandum, Table A:Project Trip Generation 631

APPENDIX E

HYDROLOGY STUDY

632
633
Table of Contents
Discussion……………………………………………………………………………………………………………………………………………1-2 Appendix A
T h o m a s G u i d e M a p
Hydrologic Soils Group Map
Rainfall Maps
Fontana West End Venture Master Plan- Line K Hydrology Map Appendix B
Rational Method Output (Pre-developed)
Appendix C
Rational Method Output (Post-Developed)
Appendix D
Unit Hydrographs (Post-Developed)
Appendix E
Outflow vs Volume Calcs
Routing Calcs
Appendix F
Retention BMP Design from WQMP
Soils Report
Factor of Safety Worksheet
Fontana West End Venture Master Plan- Line K Hydrology Map & Values Line K Master Plan Hydrology Calcs
634

Discussion

The purpose of this study is to determine the hydrology impacts to the existing downstream facilities and properties and to ensure that the design mitigates increased flows to the existing facilities.

The study will verify flows to the downstream facilities and will also size infrastructure onsite to address stormwater quality design per the WQMP and show that the discharged flows to Hilton Drive are below the levels designed in the Master Plan Hydrology (“Master Hydrology for Fontana West End Venture Foothill Drains- Lines A, B, D, J, K”.)
The project proposes to develop a 3.94-acre site located at Hilton Drive, Lot 2 tract 13643. in the city of Fontana. The site is bounded to the north, east and west by commercial developments, and to the south by the right-of-way of Hilton Drive Site soils are Hydrologic Soil Group “A.” In its existing condition, the project site is undeveloped. The project site sheets storm water flows in a southerly direction, discharging into the right-of-way of Hilton Drive. It does not accept storm water run-on from the adjacent properties. See the Pre-Developed Hydrology Map in Appendix B. There is an existing storm drain constructed in Hilton Drive identified as Line K as shown on “Master Hydrology for Fontana West End Venture Foothill Drains- Lines A, B, D, J, K”. This parcel is part of areas 991.1 & 991.2 totaling 14.0 acres.

The project proposes to develop the site for commercial use. Proposed improvements consist of two warehouse buildings with loading docks, AC pavement, concrete hardscape, landscape, concrete curbs and gutters, two catch basin inlets, and a proposed underground infiltration system. The proposed development will be 87% impervious.

The proposed site design will mimic the existing drainage patterns of the property, directing storm flows to the southerly boundary of the project site. Drainage Area A1 consists of the easterly portion of the project site Storm water sheets across proposed AC pavement and landscape to be intercepted by proposed concrete gutters. The gutters convey flows southerly to be intercepted by a proposed inlet located at the southeasterly corner of the project site. The inlet discharges flows into a proposed storm drain that conveys flows westerly and discharges into the proposed underground infiltration system located beneath the southeasterly parking area. Drainage area A2 consists of the westerly portion of the project site. Storm water sheets across proposed AC pavement and landscape to be intercepted by proposed curb gutters. The gutters convey flows southerly to be intercepted by a proposed inlet located at the southwesterly corner of the project site and discharges into an underground infiltration system. See the Post-Developed Hydrology Map in Appendix C.

635

The proposed underground infiltration system has been designed to store the Design Capture Volume (DCV) for the project site, and to infiltrate it into the soil within 48 hours. The design is in accordance with the 2013 Technical Guidance Document for Water Quality Management Plans of San Bernardino County. See Appendix F for the design of the proposed underground infiltration system Rational Studies have been prepared for the pre-developed condition and post-developed condition using CivilCADD/CivilDESIGN software. The studies were prepared for the 2-year, 10-year, 25- year and 100-year storms. Per the County guidance for design of detention basins the pre-developed condition used 1-year rainfall rates for the 2-year storm, 5-year rainfall rates for the 10-year storm, 10- year rainfall rates for the 25-year storm and 25-year rainfall rates for the 100-year storm. Studies for the post-developed condition were prepared for the same storm intervals using 2-year, 10-year, 25-year and 100-year rainfall rates. This provides a conservative design for the sizing of the storage system per the County guidance. The pre-developed condition studies are shown in Appendix B; the post- developed condition studies are shown in Appendix C.

Unit hydrographs were prepared for the 3-hour and 24-hour dura tions for the 2-year storm, 10- year storm, 25-year storm and 100 year storm. These hydrographs were used to prepare routing calculations to show the underground infiltration system provides enough storage to ensure the overflow discharge at the southeast corner of the site does not exceed the allowable rate per the Master Plan Hydrology study. See Appendix D for result.

Appendix E includes the depth versus volume calculations for the storage and outflow rates of the underground infiltration system. The underground infiltration system consists of 8-foot diameter perforated CMP pipes, backfilled with washed rock (3/4” to 1-1/2” in diameter); said rock is wrapped with a non-woven filter fabric to prevent sediment from entering the voids of the pipe and to prevent erosion of the existing soil around the system. Details for this underground system are included in Appendix E. The storm flows start to fill the pipes and rock voids (assumed to be 40% of the overall volume). While the flows are filling the system, the flows will infiltrate into the soil at a rate of 0.41 cfs for the system. During larger storm events the system will fill and bubble out of the box inlets at the southeast corner of the site, flow through the proposed landscape plater and discharge into Cherry Avenue through a proposed underwalk drain. The routing calculations show the maximum post- developed discharge rate is below the flow that was tabled for this site per the Fontana West End Venture Master Plan Line K flows. See the table below showing the pre-developed flows, post- developed flows, allowable master plan flows and peak routed flows. Note that the time of concentration for the master plan flows is much higher than for the project site hydrology. This is a 636

conservative approach, since the project site pflows would be less using the higher time of concentration.

Drainage
Area
Area
(Acres)
Storm
(Yr.)
Q Pre
(CFS)
Q Post
(CFS)
Allowed Flow
Master Plan (CFS)
Peak – Routed
Flow
(CFS)
3-Hour 24 Hour
A 3.98 2 1.21
2YR-Rain

4.96 Not Calc. 0.41 0.41
A 3.98 10 2.52
5YR-Rain

9.04 8.28 0.41 0.41
A 3.98 25 3.63
10YR-Rain

11.34 9.71 2.44 2.44
A 3.98 100 6.16
25 YR-Rain

14.89 12.46 11.25 11.25

CONCLUSION
The underground infiltration system is designed to mitigate the increased runoff due to re- development of the site and also designed to meet the requirements per the County of San Bernardino WQMP Technical Guidance Document for treatment of the required storm volume. The WQMP Exhibit is included in Appendix F to show the design layout and cross-section of the underground infiltration system. It also shows the required volumes, as calculated in the WQMP for said project, and provided volumes. Capacity calculations for the systems are also included. The soils report including the infiltration rates are attached in Appendix F. The Factor of Safety Worksheet is included as well as drawdown calculations showing the system infiltrates within 48 hours. The drawdown time is 28.4 hours for the system which is well below the maximum 48 hour drawdown time. Routing calculations show the underground system allows for 0.41 cfs of infiltration. The 2- Year and 10-Year Storms will be contained within the underground infiltration system. The 25-Year and 100-Year storms will exceed the capacity of the underground infiltration system. Once the system is full and overflows the catch basin inlet at the southwest corner (lowest outlet) the flows will discharge through an underwalk drain to 637

Hilton Drive. The discharge rate for the 25-Year storm is 2.44 cfs and the discharge rate for the 100-Year 24-Hour storm is 11.25 cfs. These rates are well below the allowed rates per the master plan hydrology for Line K, 9.71 cfs and 12.46cfs, respectively.

638

Appendix A

639
640
641
642
643
8/16/23, 12:17 PM Precipitation Frequency Data Server
https://hdsc.nws.noaa.gov/pfds/pfds_printpage.html?lat=34.1092&lon=-117.4808&data=intensity&units=english&series=pds 1/4 NOAA Atlas 14, Volume 6, Version 2Location name: Fontana, California, USA*Latitude: 34.1092°, Longitude: -117.4808°Elevation: 1264 ft*** source: ESRI Maps** source: USGS

POINT PRECIPITATION FREQUENCY ESTIMATES
Sanja Perica, Sarah Dietz, Sarah Heim, Lillian Hiner, Kazungu Maitaria, Deborah Martin, SandraPavlovic, Ishani Roy, Carl Trypaluk, Dale Unruh, Fenglin Yan, Michael Yekta, Tan Zhao, GeoffreyBonnin, Daniel Brewer, Li-Chuan Chen, Tye Parzybok, John Yarchoan NOAA, National Weather Service, Silver Spring, Maryland PF_tabular | PF_graphical | Maps_&_aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches/hour)1 Duration Average recurrence interval (years)
1 2 5 10 25 50 100 200 500 1000
5-min 1.39(1.15 ‑ 1.68) 1.82(1.52 ‑ 2.22) 2.41(2.00 ‑ 2.94) 2.90(2.39 ‑ 3.58) 3.60(2.86 ‑ 4.57) 4.14(3.22 ‑ 5.38) 4.70(3.56 ‑ 6.28) 5.32(3.91 ‑ 7.28) 6.16(4.34 ‑ 8.82) 6.84(4.66 ‑ 10.2) 10-min 0.996(0.828 ‑ 1.21) 1.31(1.09 ‑ 1.59) 1.73(1.43 ‑ 2.11) 2.08(1.72 ‑ 2.56) 2.57(2.05 ‑ 3.28) 2.96(2.31 ‑ 3.85) 3.37(2.56 ‑ 4.49) 3.80(2.80 ‑ 5.22) 4.42(3.11 ‑ 6.32) 4.91(3.34 ‑ 7.28) 15-min 0.804(0.668 ‑ 0.972) 1.06(0.880 ‑ 1.28) 1.40(1.16 ‑ 1.70) 1.68(1.38 ‑ 2.06) 2.08(1.65 ‑ 2.64) 2.39(1.86 ‑ 3.11) 2.72(2.06 ‑ 3.62) 3.07(2.26 ‑ 4.21) 3.56(2.51 ‑ 5.10) 3.96(2.69 ‑ 5.87) 30-min 0.592(0.494 ‑ 0.718) 0.780(0.648 ‑ 0.948) 1.03(0.856 ‑ 1.26) 1.24(1.02 ‑ 1.52) 1.53(1.22 ‑ 1.95) 1.77(1.37 ‑ 2.29) 2.01(1.52 ‑ 2.68) 2.27(1.67 ‑ 3.11) 2.63(1.85 ‑ 3.76) 2.92(1.99 ‑ 4.33) 60-min 0.437(0.364 ‑ 0.530) 0.575(0.479 ‑ 0.698) 0.760(0.631 ‑ 0.926) 0.915(0.753 ‑ 1.12) 1.13(0.899 ‑ 1.44) 1.30(1.01 ‑ 1.69) 1.48(1.12 ‑ 1.97) 1.67(1.23 ‑ 2.29) 1.94(1.37 ‑ 2.78) 2.15(1.47 ‑ 3.20) 2-hr 0.334(0.278 ‑ 0.405) 0.434(0.361 ‑ 0.528) 0.566(0.470 ‑ 0.689) 0.674(0.555 ‑ 0.828) 0.823(0.654 ‑ 1.05) 0.938(0.729 ‑ 1.22) 1.06(0.801 ‑ 1.41) 1.18(0.869 ‑ 1.62) 1.35(0.953 ‑ 1.93) 1.49(1.01 ‑ 2.21) 3-hr 0.286(0.238 ‑ 0.347) 0.370(0.308 ‑ 0.450) 0.480(0.398 ‑ 0.585) 0.569(0.468 ‑ 0.699) 0.690(0.548 ‑ 0.877) 0.783(0.609 ‑ 1.02) 0.878(0.665 ‑ 1.17) 0.976(0.718 ‑ 1.34) 1.11(0.783 ‑ 1.59) 1.22(0.828 ‑ 1.80) 6-hr 0.209(0.174 ‑ 0.254) 0.270(0.225 ‑ 0.328) 0.348(0.289 ‑ 0.424) 0.411(0.338 ‑ 0.505) 0.495(0.393 ‑ 0.629) 0.558(0.434 ‑ 0.725) 0.621(0.471 ‑ 0.828) 0.686(0.505 ‑ 0.941) 0.773(0.545 ‑ 1.11) 0.840(0.572 ‑ 1.24) 12-hr 0.140(0.116 ‑ 0.169) 0.182(0.151 ‑ 0.221) 0.235(0.195 ‑ 0.286) 0.277(0.228 ‑ 0.340) 0.331(0.263 ‑ 0.421) 0.372(0.289 ‑ 0.483) 0.411(0.312 ‑ 0.548) 0.451(0.332 ‑ 0.619) 0.504(0.355 ‑ 0.721) 0.543(0.370 ‑ 0.806) 24-hr 0.095(0.084 ‑ 0.110) 0.126(0.111 ‑ 0.145) 0.164(0.144 ‑ 0.190) 0.194(0.169 ‑ 0.226) 0.232(0.196 ‑ 0.280) 0.260(0.216 ‑ 0.320) 0.288(0.233 ‑ 0.363) 0.315(0.248 ‑ 0.408) 0.350(0.265 ‑ 0.473) 0.376(0.275 ‑ 0.526) 2-day 0.058(0.051 ‑ 0.067) 0.078(0.069 ‑ 0.090) 0.104(0.092 ‑ 0.120) 0.125(0.109 ‑ 0.145) 0.152(0.128 ‑ 0.183) 0.172(0.143 ‑ 0.212) 0.192(0.155 ‑ 0.242) 0.212(0.167 ‑ 0.275) 0.239(0.181 ‑ 0.322) 0.259(0.189 ‑ 0.362) 3-day 0.041(0.036 ‑ 0.048) 0.057(0.050 ‑ 0.066) 0.077(0.068 ‑ 0.089) 0.093(0.082 ‑ 0.109) 0.115(0.097 ‑ 0.139) 0.132(0.109 ‑ 0.162) 0.149(0.120 ‑ 0.187) 0.166(0.131 ‑ 0.215) 0.189(0.143 ‑ 0.255) 0.207(0.151 ‑ 0.289) 4-day 0.033(0.029 ‑ 0.038) 0.046(0.041 ‑ 0.054) 0.063(0.056 ‑ 0.074) 0.077(0.068 ‑ 0.090) 0.096(0.082 ‑ 0.116) 0.111(0.092 ‑ 0.137) 0.126(0.102 ‑ 0.159) 0.141(0.111 ‑ 0.183) 0.162(0.122 ‑ 0.218) 0.178(0.130 ‑ 0.249) 7-day 0.022(0.019 ‑ 0.025) 0.031(0.027 ‑ 0.035) 0.042(0.037 ‑ 0.049) 0.052(0.046 ‑ 0.061) 0.065(0.055 ‑ 0.079) 0.076(0.063 ‑ 0.093) 0.086(0.070 ‑ 0.109) 0.098(0.077 ‑ 0.126) 0.113(0.085 ‑ 0.152) 0.125(0.091 ‑ 0.174) 10-day 0.016(0.014 ‑ 0.019) 0.023(0.021 ‑ 0.027) 0.033(0.029 ‑ 0.038) 0.040(0.035 ‑ 0.047) 0.051(0.043 ‑ 0.061) 0.059(0.049 ‑ 0.073) 0.068(0.055 ‑ 0.085) 0.077(0.060 ‑ 0.099) 0.089(0.067 ‑ 0.120) 0.099(0.072 ‑ 0.138) 20-day 0.009(0.008 ‑ 0.011) 0.014(0.012 ‑ 0.016) 0.019(0.017 ‑ 0.023) 0.024(0.021 ‑ 0.029) 0.031(0.026 ‑ 0.038) 0.037(0.030 ‑ 0.045) 0.042(0.034 ‑ 0.053) 0.048(0.038 ‑ 0.063) 0.057(0.043 ‑ 0.077) 0.064(0.046 ‑ 0.089) 30-day 0.007(0.006 ‑ 0.008) 0.011(0.009 ‑ 0.012) 0.015(0.013 ‑ 0.018) 0.019(0.017 ‑ 0.022) 0.025(0.021 ‑ 0.030) 0.029(0.024 ‑ 0.036) 0.034(0.027 ‑ 0.043) 0.039(0.031 ‑ 0.051) 0.046(0.035 ‑ 0.062) 0.052(0.038 ‑ 0.073) 45-day 0.006(0.005 ‑ 0.007) 0.008(0.007 ‑ 0.010) 0.012(0.010 ‑ 0.014) 0.015(0.013 ‑ 0.018) 0.019(0.016 ‑ 0.023) 0.023(0.019 ‑ 0.028) 0.027(0.022 ‑ 0.034) 0.031(0.024 ‑ 0.040) 0.037(0.028 ‑ 0.050) 0.042(0.031 ‑ 0.059) 60-day 0.005(0.004 ‑ 0.006) 0.007(0.006 ‑ 0.008) 0.010(0.009 ‑ 0.012) 0.013(0.011 ‑ 0.015) 0.017(0.014 ‑ 0.020) 0.020(0.016 ‑ 0.024) 0.023(0.019 ‑ 0.029) 0.027(0.021 ‑ 0.035) 0.032(0.024 ‑ 0.044) 0.037(0.027 ‑ 0.051) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).

Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (fora given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are notchecked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values.

Please refer to NOAA Atlas 14 document for more information.

Appendix B

645
646
San Bernardino County Rational Hydrology Program
(Hydrology Manual Date ‐ August 1986)
CIVILCADD/CIVILDESIGN Engineering Software, (c) 1989‐2005 Version 7.1 Rational Hydrology Study Date: 06/28/24
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ jn4113 Hilton Avenue
Pre‐Developed Condition
2 ‐ YEAR STORM
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ ********* Hydrology Study Control Information ********** ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ Rational hydrology study storm event year is 2.0
Computed rainfall intensity:

Storm year =     2.00   1 hour rainfall =     0.575 (In.) Slope used for rainfall intensity curve b =  0.6000
Soil antecedent moisture condition (AMC) = 1
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        2.000 **** INITIAL AREA EVALUATION **** AREA A1
______________________________________________________________________ UNDEVELOPED (average cover) subarea
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
SCS curve number for soil(AMC 2)  = 50.00
Pervious ratio(Ap) = 1.0000     Max loss rate(Fm)=     0.810(In/Hr) Initial subarea data:

Initial area flow distance =   575.000(Ft.)
Top (of initial area) elevation =  1269.000(Ft.)
Bottom (of initial area) elevation =  1255.540(Ft.)
Difference in elevation =    13.460(Ft.)
Slope =    0.02341  s(%)=       2.34
TC = k(0.706)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration =   19.002 min.

Rainfall intensity =      1.146(In/Hr) for a     2.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.264 Subarea runoff =      1.206(CFS)
Total initial stream area =        3.980(Ac.)
Pervious area fraction = 1.000
Initial area Fm value =    0.810(In/Hr)
End of computations, Total Study Area =            3.98 (Ac.) The following figures may
be used for a unit hydrograph study of the same area.
647
Note: These figures do not consider reduced effective area effects caused by confluences in the rational equation.

Area averaged pervious area fraction(Ap) = 1.000
Area averaged SCS curve number =  50.0
648
San Bernardino County Rational Hydrology Program
(Hydrology Manual Date ‐ August 1986)
CIVILCADD/CIVILDESIGN  Engineering Software, (c) 1989‐2005 Version 7.1 Rational Hydrology Study        Date: 06/28/24
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ jn4113 Hilton Avenue
Pre‐Developed Condition
10‐Year Storm
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ *********   Hydrology Study Control Information ********** ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ Rational hydrology study storm event year is    10.0
Computed rainfall intensity:

Storm year =    10.00   1 hour rainfall =     0.760 (In.) Slope used for rainfall intensity curve b =  0.6000
Soil antecedent moisture condition (AMC) = 1
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        2.000 **** INITIAL AREA EVALUATION **** AREA A1
______________________________________________________________________ UNDEVELOPED (average cover) subarea
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
SCS curve number for soil(AMC 2)  = 50.00
Pervious ratio(Ap) = 1.0000     Max loss rate(Fm)=     0.810(In/Hr) Initial subarea data:

Rainfall intensity =      1.515(In/Hr) for a    10.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.419 Subarea runoff =      2.527(CFS)
Total initial stream area =        3.980(Ac.)
Pervious area fraction = 1.000
Initial area Fm value =    0.810(In/Hr)
End of computations, Total Study Area =            3.98 (Ac.) The following figures may
be used for a unit hydrograph study of the same area.
649
Note: These figures do not consider reduced effective area effects caused by confluences in the rational equation.

Area averaged pervious area fraction(Ap) = 1.000
Area averaged SCS curve number = 50.0
650
San Bernardino County Rational Hydrology Program
(Hydrology Manual Date ‐ August 1986)
CIVILCADD/CIVILDESIGN Engineering Software, (c) 1989‐2005 Version 7.1 Rational Hydrology Study Date: 06/28/24
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ jn4113 Hilton Avenue
Pre‐Developed Condition
25 ‐ YEAR STORM

‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ ********* Hydrology Study Control Information
**********
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ Rational hydrology study storm event year is 25.0
Computed rainfall intensity:

Storm year =    25.00   1 hour rainfall =     0.915 (In.) Slope used for rainfall intensity curve b =  0.6000
Soil antecedent moisture condition (AMC) = 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        2.000 **** INITIAL AREA EVALUATION ****
______________________________________________________________________ UNDEVELOPED (average cover) subarea
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
SCS curve number for soil(AMC 2)  = 50.00
Pervious ratio(Ap) = 1.0000     Max loss rate(Fm)=     0.810(In/Hr) Initial subarea data:

Rainfall intensity =      1.824(In/Hr) for a    25.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.501 651
Subarea runoff =      3.634(CFS)
Total initial stream area =        3.980(Ac.)
Pervious area fraction = 1.000
Initial area Fm value =    0.810(In/Hr)
End of computations, Total Study Area =            3.98 (Ac.) The following figures may
be used for a unit hydrograph study of the same area.

Note: These figures do not consider reduced effective area effects caused by confluences in the rational equation.

Area averaged pervious area fraction(Ap) = 1.000
Area averaged SCS curve number =  50.0
652
San Bernardino County Rational Hydrology Program
(Hydrology Manual Date ‐ August 1986)
CIVILCADD/CIVILDESIGN  Engineering Software, (c) 1989‐2005 Version 7.1 Rational Hydrology Study        Date: 06/28/24
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ JN4113 HILTON DRIVE
Pre‐Developed Condition
100‐Year Storm
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ *********   Hydrology Study Control Information ********** ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ Rational hydrology study storm event year is   100.0
Computed rainfall intensity:

Storm year =   100.00   1 hour rainfall =     1.130 (In.) Slope used for rainfall intensity curve b =  0.6000
Soil antecedent moisture condition (AMC) = 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        2.000 **** INITIAL AREA EVALUATION **** AREA A1
______________________________________________________________________ UNDEVELOPED (average cover) subarea
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
SCS curve number for soil(AMC 2)  = 50.00
Adjusted SCS curve number for AMC 3 = 70.00
Pervious ratio(Ap) = 1.0000     Max loss rate(Fm)=     0.532(In/Hr) Initial subarea data:

Rainfall intensity =      2.253(In/Hr) for a   100.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.687 Subarea runoff =      6.162(CFS)
Total initial stream area =        3.980(Ac.)
Pervious area fraction = 1.000
Initial area Fm value =    0.532(In/Hr)
End of computations, Total Study Area =            3.98 (Ac.) The following figures may
653
be used for a unit hydrograph study of the same area.

Note: These figures do not consider reduced effective area effects caused by confluences in the rational equation.

Area averaged pervious area fraction(Ap) = 1.000
Area averaged SCS curve number = 50.0
654

Appendix C

655
656
San Bernardino County Rational Hydrology Program
(Hydrology Manual Date ‐ August 1986)
CIVILCADD/CIVILDESIGN  Engineering Software, (c) 1989‐2005 Version 7.1 Rational Hydrology Study        Date: 07/24/24
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ JN 4113 Hilton Ave
Post‐Developed Condition
2‐Year Storm
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ *********   Hydrology Study Control Information ********** ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rational hydrology study storm event year is     2.0
10 Year storm 1 hour rainfall  =      0.915(In.)
100 Year storm 1 hour rainfall  =      1.480(In.)
Computed rainfall intensity:

Storm year =     2.00   1 hour rainfall =     0.520 (In.) Slope used for rainfall intensity curve b =  0.6000
Soil antecedent moisture condition (AMC) = 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        2.000 **** INITIAL AREA EVALUATION **** AREA A1
______________________________________________________________________ COMMERCIAL subarea type
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
SCS curve number for soil(AMC 2)  = 32.00
Pervious ratio(Ap) = 0.1000     Max loss rate(Fm)=     0.098(In/Hr) Initial subarea data:

Initial area flow distance =   773.000(Ft.)
Top (of initial area) elevation =  1265.000(Ft.)
Bottom (of initial area) elevation =  1256.420(Ft.)
Difference in elevation =     8.580(Ft.)
Slope =    0.01110  s(%)=       1.11
TC = k(0.304)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration =   10.693 min.

Rainfall intensity =      1.464(In/Hr) for a     2.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.840 Subarea runoff =      2.717(CFS)
Total initial stream area =        2.210(Ac.)
Pervious area fraction = 0.100
Initial area Fm value =    0.098(In/Hr)
657
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        2.000 to Point/Station        4.000 **** PIPEFLOW TRAVEL TIME (User specified size) ****
______________________________________________________________________ Upstream point/station elevation =  1255.900(Ft.)
Downstream point/station elevation =  1255.680(Ft.)
Pipe length  =    44.87(Ft.)   Manning's N = 0.013
No. of pipes = 1  Required pipe flow  =     2.717(CFS)
Given pipe size =      8.00(In.)
NOTE: Normal flow is pressure flow in user selected pipe size.

The approximate hydraulic grade line above the pipe invert is

3.459(Ft.)  at the headworks or inlet of the pipe(s)
Pipe friction loss =      2.268(Ft.)
Minor friction loss =      1.411(Ft.) K ‐factor =   1.50 Pipe flow velocity =      7.78(Ft/s)
Travel time through pipe =    0.10 min.

Time of concentration (TC) =    10.79 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        4.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area =      2.210(Ac.)
Runoff from this stream =      2.717(CFS)
Time of concentration =   10.79 min.

Rainfall intensity =     1.456(In/Hr)
Area averaged loss rate (Fm) =    0.0978(In/Hr)
Area averaged Pervious ratio (Ap) = 0.1000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        3.000 **** INITIAL AREA EVALUATION **** AREA A2
______________________________________________________________________ COMMERCIAL subarea type
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
SCS curve number for soil(AMC 2)  = 32.00
Pervious ratio(Ap) = 0.1000     Max loss rate(Fm)=     0.098(In/Hr) Initial subarea data:

Initial area flow distance =   672.000(Ft.)
Top (of initial area) elevation =  1265.000(Ft.)
Bottom (of initial area) elevation =  1256.650(Ft.)
Difference in elevation =     8.350(Ft.)
Slope =    0.01243  s(%)=       1.24
TC = k(0.304)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration =    9.885 min.
658
Rainfall intensity =      1.535(In/Hr) for a     2.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.843 Subarea runoff =      2.289(CFS)
Total initial stream area =        1.770(Ac.)
Pervious area fraction = 0.100
Initial area Fm value =    0.098(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        3.000 to Point/Station        4.000 **** PIPEFLOW TRAVEL TIME (User specified size) ****
______________________________________________________________________ Upstream point/station elevation =  1251.150(Ft.)
Downstream point/station elevation =  1249.640(Ft.)
Pipe length  =   202.00(Ft.)   Manning's N = 0.013
No. of pipes = 1  Required pipe flow  =     2.289(CFS)
Given pipe size =     18.00(In.)
Calculated individual pipe flow  =     2.289(CFS)
Normal flow depth in pipe =    6.16(In.)
Flow top width inside pipe =   17.08(In.)
Critical Depth =    6.86(In.)
Pipe flow velocity =      4.28(Ft/s)
Travel time through pipe =    0.79 min.

Time of concentration (TC) =    10.67 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        3.000 to Point/Station        4.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area =      1.770(Ac.)
Runoff from this stream =      2.289(CFS)
Time of concentration =   10.67 min.

Rainfall intensity = 1.466(In/Hr)
Area averaged loss rate (Fm) = 0.0978(In/Hr)
Area averaged Pervious ratio (Ap) = 0.1000
Summary of stream data:

Stream Flow rate    Area    TC     Fm       Rainfall Intensity No.    (CFS)   (Ac.)       (min) (In/Hr)     (In/Hr)
1      2.72     2.210     10.79    0.098      1.456
2      2.29     1.770     10.67    0.098      1.466
Qmax(1) =

1.000 * 1.000 * 2.717) +

0.993 * 1.000 * 2.289) + = 4.990
Qmax(2) =

1.007 * 0.989 * 2.717) +

1.000 * 1.000 * 2.289) + = 4.995
659
Total of 2 streams to confluence:

Flow rates before confluence point:

2.717 2.289
Maximum flow rates at confluence using above data:

4.990 4.995
Area of streams before confluence:

2.210 1.770
Effective area values after confluence:

3.980 3.956
Results of confluence:

Total flow rate = 4.995(CFS)
Time of concentration = 10.671 min.

Effective stream area after confluence =      3.956(Ac.) Study area average Pervious fraction(Ap) =  0.100
Study area average soil loss rate(Fm) =    0.098(In/Hr) Study area total (this main stream) =       3.98(Ac.)
End of computations, Total Study Area =            3.98 (Ac.) The following figures may
be used for a unit hydrograph study of the same area.

Note: These figures do not consider reduced effective area effects caused by confluences in the rational equation.

Area averaged pervious area fraction(Ap) = 0.100
Area averaged SCS curve number =  32.0
660
San Bernardino County Rational Hydrology Program
(Hydrology Manual Date ‐ August 1986)
CIVILCADD/CIVILDESIGN  Engineering Software, (c) 1989‐2005 Version 7.1 Rational Hydrology Study        Date: 07/24/24
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ *********   Hydrology Study Control Information ********** ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rational hydrology study storm event year is    10.0
Computed rainfall intensity:

Storm year =    10.00   1 hour rainfall =     0.915 (In.) Slope used for rainfall intensity curve b =  0.6000
Soil antecedent moisture condition (AMC) = 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        2.000 **** INITIAL AREA EVALUATION **** AREA A1
______________________________________________________________________ COMMERCIAL subarea type
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
SCS curve number for soil(AMC 2)  = 32.00
Pervious ratio(Ap) = 0.1000     Max loss rate(Fm)=     0.098(In/Hr) Initial subarea data:

Rainfall intensity =      2.575(In/Hr) for a    10.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.866 Subarea runoff =      4.928(CFS)
Total initial stream area =        2.210(Ac.)
Pervious area fraction = 0.100
Initial area Fm value =    0.098(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        2.000 to Point/Station        4.000 **** PIPEFLOW TRAVEL TIME (User specified size) ****
______________________________________________________________________ Upstream point/station elevation =  1255.900(Ft.)
Downstream point/station elevation =  1255.680(Ft.)
661
Pipe length  =    44.87(Ft.)   Manning's N = 0.013
No. of pipes = 1  Required pipe flow  =     4.928(CFS)
Given pipe size =      8.00(In.)
NOTE: Normal flow is pressure flow in user selected pipe size.

The approximate hydraulic grade line above the pipe invert is

11.883(Ft.)  at the headworks or inlet of the pipe(s)
Pipe friction loss =      7.460(Ft.)
Minor friction loss =      4.643(Ft.) K ‐factor =   1.50 Pipe flow velocity =     14.12(Ft/s)
Travel time through pipe =    0.05 min.

Time of concentration (TC) =    10.75 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        4.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area =      2.210(Ac.)
Runoff from this stream =      4.928(CFS)
Time of concentration =   10.75 min.

Rainfall intensity =     2.568(In/Hr)
Area averaged loss rate (Fm) =    0.0978(In/Hr)
Area averaged Pervious ratio (Ap) = 0.1000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        3.000 **** INITIAL AREA EVALUATION **** AREA A2
______________________________________________________________________ COMMERCIAL subarea type
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
SCS curve number for soil(AMC 2)  = 32.00
Pervious ratio(Ap) = 0.1000     Max loss rate(Fm)=     0.098(In/Hr) Initial subarea data:

Rainfall intensity =      2.700(In/Hr) for a    10.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.867 Subarea runoff =      4.145(CFS)
Total initial stream area =        1.770(Ac.)
Pervious area fraction = 0.100
Initial area Fm value =    0.098(In/Hr)
662
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        3.000 to Point/Station        4.000 **** PIPEFLOW TRAVEL TIME (User specified size) ****
______________________________________________________________________ Upstream point/station elevation =  1251.150(Ft.)
Downstream point/station elevation =  1249.640(Ft.)
Pipe length  =   202.00(Ft.)   Manning's N = 0.013
No. of pipes = 1  Required pipe flow  =     4.145(CFS)
Given pipe size =     18.00(In.)
Calculated individual pipe flow  =     4.145(CFS)
Normal flow depth in pipe =    8.53(In.)
Flow top width inside pipe =   17.98(In.)
Critical Depth =    9.35(In.)
Pipe flow velocity =      5.02(Ft/s)
Travel time through pipe =    0.67 min.

Time of concentration (TC) =    10.56 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        3.000 to Point/Station        4.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area =      1.770(Ac.)
Runoff from this stream =      4.145(CFS)
Time of concentration =   10.56 min.

Rainfall intensity = 2.596(In/Hr)
Area averaged loss rate (Fm) = 0.0978(In/Hr)
Area averaged Pervious ratio (Ap) = 0.1000
Summary of stream data:

Stream Flow rate    Area    TC     Fm       Rainfall Intensity No.    (CFS)   (Ac.)       (min) (In/Hr)     (In/Hr)
1      4.93     2.210     10.75    0.098      2.568
2      4.15     1.770     10.56    0.098      2.596
Qmax(1) =

1.000 * 1.000 * 4.928) +

0.989 * 1.000 * 4.145) + = 9.027
Qmax(2) =

1.011 * 0.982 * 4.928) +

1.000 * 1.000 * 4.145) + = 9.040
Total of 2 streams to confluence:

Flow rates before confluence point:

4.928 4.145
Maximum flow rates at confluence using above data:

9.027 9.040
Area of streams before confluence:

2.210 1.770
Effective area values after confluence:
663

3.980 3.941
Results of confluence:

Total flow rate = 9.040(CFS)
Time of concentration = 10.555 min.

Effective stream area after confluence =      3.941(Ac.) Study area average Pervious fraction(Ap) =  0.100
Study area average soil loss rate(Fm) =    0.098(In/Hr) Study area total (this main stream) =       3.98(Ac.)
End of computations, Total Study Area =            3.98 (Ac.) The following figures may
be used for a unit hydrograph study of the same area.

Note: These figures do not consider reduced effective area effects caused by confluences in the rational equation.

Area averaged pervious area fraction(Ap) = 0.100
Area averaged SCS curve number =  32.0
664
San Bernardino County Rational Hydrology Program
(Hydrology Manual Date ‐ August 1986)
CIVILCADD/CIVILDESIGN  Engineering Software, (c) 1989‐2005 Version 7.1 Rational Hydrology Study        Date: 07/24/24
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ JN 4113 Hilton Ave
Post‐Developed Condition
25‐Year Storm
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ *********   Hydrology Study Control Information ********** ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ Rational hydrology study storm event year is    25.0
10 Year storm 1 hour rainfall  =      0.915(In.)
100 Year storm 1 hour rainfall  =      1.480(In.)
Computed rainfall intensity:

Storm year =    25.00   1 hour rainfall =     1.140 (In.) Slope used for rainfall intensity curve b =  0.6000
Soil antecedent moisture condition (AMC) = 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        2.000 **** INITIAL AREA EVALUATION **** AREA A1
______________________________________________________________________ COMMERCIAL subarea type
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
SCS curve number for soil(AMC 2)  = 32.00
Pervious ratio(Ap) = 0.1000     Max loss rate(Fm)=     0.098(In/Hr) Initial subarea data:

Rainfall intensity =      3.208(In/Hr) for a    25.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.873 Subarea runoff =      6.187(CFS)
Total initial stream area =        2.210(Ac.)
Pervious area fraction = 0.100
Initial area Fm value =    0.098(In/Hr)
665
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        2.000 to Point/Station        4.000 **** PIPEFLOW TRAVEL TIME (User specified size) ****
______________________________________________________________________ Upstream point/station elevation =  1255.900(Ft.)
Downstream point/station elevation =  1255.680(Ft.)
Pipe length  =    44.87(Ft.)   Manning's N = 0.013
No. of pipes = 1  Required pipe flow  =     6.187(CFS)
Given pipe size =      8.00(In.)
NOTE: Normal flow is pressure flow in user selected pipe size.

The approximate hydraulic grade line above the pipe invert is

18.855(Ft.)  at the headworks or inlet of the pipe(s)
Pipe friction loss =     11.758(Ft.)
Minor friction loss =      7.317(Ft.) K ‐factor =   1.50 Pipe flow velocity =     17.72(Ft/s)
Travel time through pipe =    0.04 min.

Time of concentration (TC) =    10.73 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        4.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area =      2.210(Ac.)
Runoff from this stream =      6.187(CFS)
Time of concentration =   10.73 min.

Rainfall intensity =     3.201(In/Hr)
Area averaged loss rate (Fm) =    0.0978(In/Hr)
Area averaged Pervious ratio (Ap) = 0.1000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        3.000 **** INITIAL AREA EVALUATION **** AREA A2
______________________________________________________________________ COMMERCIAL subarea type
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
SCS curve number for soil(AMC 2)  = 32.00
Pervious ratio(Ap) = 0.1000     Max loss rate(Fm)=     0.098(In/Hr) Initial subarea data:

Rainfall intensity =      3.363(In/Hr) for a    25.0 year storm 666
Effective runoff coefficient used for area (Q=KCIA) is C = 0.874 Subarea runoff =      5.202(CFS)
Total initial stream area =        1.770(Ac.)
Pervious area fraction = 0.100
Initial area Fm value =    0.098(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        3.000 to Point/Station        4.000 **** PIPEFLOW TRAVEL TIME (User specified size) ****
______________________________________________________________________ Upstream point/station elevation =  1251.150(Ft.)
Downstream point/station elevation =  1249.640(Ft.)
Pipe length  =   202.00(Ft.)   Manning's N = 0.013
No. of pipes = 1  Required pipe flow  =     5.202(CFS)
Given pipe size =     18.00(In.)
Calculated individual pipe flow  =     5.202(CFS)
Normal flow depth in pipe =    9.76(In.)
Flow top width inside pipe =   17.94(In.)
Critical Depth =   10.53(In.)
Pipe flow velocity =      5.31(Ft/s)
Travel time through pipe =    0.63 min.

Time of concentration (TC) =    10.52 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        3.000 to Point/Station        4.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area =      1.770(Ac.)
Runoff from this stream =      5.202(CFS)
Time of concentration =   10.52 min.

Rainfall intensity = 3.240(In/Hr)
Area averaged loss rate (Fm) = 0.0978(In/Hr)
Area averaged Pervious ratio (Ap) = 0.1000
Summary of stream data:

Stream Flow rate    Area    TC     Fm       Rainfall Intensity No.    (CFS)   (Ac.)       (min) (In/Hr)     (In/Hr)
1      6.19     2.210     10.73    0.098      3.201
2      5.20     1.770     10.52    0.098      3.240
Qmax(1) =

1.000 * 1.000 * 6.187) +

0.987 * 1.000 * 5.202) + = 11.324
Qmax(2) =

1.013 * 0.980 * 6.187) +

1.000 * 1.000 * 5.202) + = 11.341
Total of 2 streams to confluence:

Flow rates before confluence point:
667

6.187 5.202
Maximum flow rates at confluence using above data:

11.324 11.341
Area of streams before confluence:

2.210 1.770
Effective area values after confluence:

3.980 3.935
Results of confluence:

Total flow rate = 11.341(CFS)
Time of concentration = 10.518 min.

Effective stream area after confluence =      3.935(Ac.) Study area average Pervious fraction(Ap) =  0.100
Study area average soil loss rate(Fm) =    0.098(In/Hr) Study area total (this main stream) =       3.98(Ac.)
End of computations, Total Study Area =            3.98 (Ac.) The following figures may
be used for a unit hydrograph study of the same area.

Note: These figures do not consider reduced effective area effects caused by confluences in the rational equation.

Area averaged pervious area fraction(Ap) = 0.100
Area averaged SCS curve number =  32.0
668
San Bernardino County Rational Hydrology Program
(Hydrology Manual Date ‐ August 1986)
CIVILCADD/CIVILDESIGN  Engineering Software, (c) 1989‐2005 Version 7.1 Rational Hydrology Study        Date: 08/16/23
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ *********   Hydrology Study Control Information ********** ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ Rational hydrology study storm event year is   100.0
10 Year storm 1 hour rainfall  =      0.915(In.)
100 Year storm 1 hour rainfall  =      1.480(In.)
Computed rainfall intensity:

Storm year =   100.00   1 hour rainfall =     1.480 (In.) Slope used for rainfall intensity curve b =  0.6000
Soil antecedent moisture condition (AMC) = 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        2.000 **** INITIAL AREA EVALUATION **** AREA A1
______________________________________________________________________ COMMERCIAL subarea type
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
SCS curve number for soil(AMC 2)  = 32.00
Adjusted SCS curve number for AMC 3 = 52.00
Pervious ratio(Ap) = 0.1000     Max loss rate(Fm)=     0.079(In/Hr) Initial subarea data:

Rainfall intensity =      4.166(In/Hr) for a   100.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.883 Subarea runoff =      8.130(CFS)
Total initial stream area =        2.210(Ac.)
Pervious area fraction = 0.100
Initial area Fm value =    0.079(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        2.000 to Point/Station        4.000 **** PIPEFLOW TRAVEL TIME (User specified size) ****
669
______________________________________________________________________ Upstream point/station elevation =  1255.900(Ft.)
Downstream point/station elevation =  1255.680(Ft.)
Pipe length  =    44.87(Ft.)   Manning's N = 0.013
No. of pipes = 1  Required pipe flow  =     8.130(CFS)
Given pipe size =      8.00(In.)
NOTE: Normal flow is pressure flow in user selected pipe size.

The approximate hydraulic grade line above the pipe invert is

32.715(Ft.)  at the headworks or inlet of the pipe(s)
Pipe friction loss =     20.302(Ft.)
Minor friction loss =     12.634(Ft.) K ‐factor =   1.50 Pipe flow velocity =     23.29(Ft/s)
Travel time through pipe =    0.03 min.

Time of concentration (TC) =    10.72 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        4.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 1
Stream flow area =      2.210(Ac.)
Runoff from this stream =      8.130(CFS)
Time of concentration =   10.72 min.

Rainfall intensity =     4.158(In/Hr)
Area averaged loss rate (Fm) =    0.0785(In/Hr)
Area averaged Pervious ratio (Ap) = 0.1000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        1.000 to Point/Station        3.000 **** INITIAL AREA EVALUATION **** AREA A2
______________________________________________________________________ COMMERCIAL subarea type
Decimal fraction soil group A = 1.000
Decimal fraction soil group B = 0.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
SCS curve number for soil(AMC 2)  = 32.00
Adjusted SCS curve number for AMC 3 = 52.00
Pervious ratio(Ap) = 0.1000     Max loss rate(Fm)=     0.079(In/Hr) Initial subarea data:

Rainfall intensity =      4.367(In/Hr) for a   100.0 year storm Effective runoff coefficient used for area (Q=KCIA) is C = 0.884 Subarea runoff =      6.831(CFS)
670
Total initial stream area =        1.770(Ac.)
Pervious area fraction = 0.100
Initial area Fm value =    0.079(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        3.000 to Point/Station        4.000 **** PIPEFLOW TRAVEL TIME (User specified size) ****
______________________________________________________________________ Upstream point/station elevation =  1251.150(Ft.)
Downstream point/station elevation =  1249.640(Ft.)
Pipe length  =   202.00(Ft.)   Manning's N = 0.013
No. of pipes = 1  Required pipe flow  =     6.831(CFS)
Given pipe size =     18.00(In.)
Calculated individual pipe flow  =     6.831(CFS)
Normal flow depth in pipe =   11.65(In.)
Flow top width inside pipe =   17.20(In.)
Critical Depth =   12.14(In.)
Pipe flow velocity =      5.64(Ft/s)
Travel time through pipe =    0.60 min.

Time of concentration (TC) =    10.48 min.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Process from Point/Station        3.000 to Point/Station        4.000 **** CONFLUENCE OF MINOR STREAMS ****
______________________________________________________________________ Along Main Stream number: 1 in normal stream number 2
Stream flow area =      1.770(Ac.)
Runoff from this stream =      6.831(CFS)
Time of concentration =   10.48 min.

Rainfall intensity = 4.216(In/Hr)
Area averaged loss rate (Fm) = 0.0785(In/Hr)
Area averaged Pervious ratio (Ap) = 0.1000
Summary of stream data:

Stream Flow rate    Area    TC     Fm       Rainfall Intensity No.    (CFS)   (Ac.)       (min) (In/Hr)     (In/Hr)
1      8.13     2.210     10.72    0.079      4.158
2      6.83     1.770     10.48    0.079      4.216
Qmax(1) =

1.000 * 1.000 * 8.130) +

0.986 * 1.000 * 6.831) + = 14.866
Qmax(2) =

1.014 * 0.977 * 8.130) +

1.000 * 1.000 * 6.831) + = 14.889
Total of 2 streams to confluence:

Flow rates before confluence point:

8.130 6.831
Maximum flow rates at confluence using above data:
671

14.866 14.889
Area of streams before confluence:

2.210 1.770
Effective area values after confluence:

3.980 3.930
Results of confluence:

Total flow rate = 14.889(CFS)
Time of concentration = 10.481 min.

Effective stream area after confluence =      3.930(Ac.) Study area average Pervious fraction(Ap) =  0.100
Study area average soil loss rate(Fm) =    0.079(In/Hr) Study area total (this main stream) =       3.98(Ac.)
End of computations, Total Study Area =            3.98 (Ac.) The following figures may
be used for a unit hydrograph study of the same area.

Note: These figures do not consider reduced effective area effects caused by confluences in the rational equation.

Area averaged pervious area fraction(Ap) = 0.100
Area averaged SCS curve number = 32.0
672

Appendix D

673
U n i t H y d r o g r a p h A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 ‐ 2004, Version 7.0 Study date 07/24/24
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ San Bernardino County Synthetic Unit Hydrology Method
Manual date ‐ August 1986
Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ JN 4113 UNIT HYDROGRAPH
2 YEAR 3 HOUR STORM‐ POST‐DEVELOPED
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Storm Event Year = 2
Antecedent Moisture Condition = 2
English (in‐lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
Area averaged rainfall intensity isohyetal data:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 10

3.98 1 0.92
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Rainfall data for year 2

3.98 6 0.27
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Rainfall data for year 2

3.98 24 0.13
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Rainfall data for year 100

3.98 1 1.48
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Rainfall data for year 100

3.98 6 0.62
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Rainfall data for year 100

3.98 24 0.29
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ********
674
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 2) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)

32.0 32.0 3.98 1.000 0.978 0.130 0.127 Area‐averaged adjusted loss rate Fm (In/Hr) = 0.127
********* Area‐Averaged low loss rate fraction, Yb ********** Area Area SCS CN SCS CN S Pervious (Ac.) Fract (AMC2) (AMC2) Yield Fr

0.52 0.130 32.0 32.0 2.61 0.000

3.46   0.870         98.0      98.0       0.20     0.647 Area‐averaged catchment yield fraction, Y =  0.563
Area‐averaged low loss fraction, Yb =  0.437
User entry of time of concentration  =   0.178 (hours)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Watershed area =       3.98(Ac.)
Catchment Lag time =   0.142 hours
Unit interval =   5.000 minutes
Unit interval percentage of lag time = 58.5700
Hydrograph baseflow =     0.00(CFS)
Average maximum watershed loss rate(Fm) =  0.127(In/Hr) Average low loss rate fraction (Yb) = 0.437 (decimal)
VALLEY DEVELOPED S‐Graph Selected
Computed peak 5‐minute rainfall =  0.192(In)
Computed peak 30‐minute rainfall =  0.394(In)
Specified peak 1‐hour rainfall =  0.520(In)
Computed peak 3‐hour rainfall =  0.520(In)
Specified peak 6‐hour rainfall =  0.521(In)
Specified peak 24‐hour rainfall =  0.522(In)
Note: user specified rainfall values used.

Rainfall depth area reduction factors:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 10

3.98 24 0.29
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 678
******** Area‐averaged max loss rate, Fm ********
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 2) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)

0.52 0.130 32.0 32.0 2.61 0.000

Rainfall depth area reduction factors:

Using a total area of       3.98(Ac.) (Ref: fig. E‐4)
5‐minute factor = 1.000     Adjusted rainfall =  0.192(In) 30‐minute factor = 1.000    Adjusted rainfall =  0.394(In) 1‐hour factor = 1.000       Adjusted rainfall =  0.520(In) 3‐hour factor = 1.000       Adjusted rainfall =  0.520(In) 6‐hour factor = 1.000       Adjusted rainfall =  0.521(In) 24‐hour factor = 1.000      Adjusted rainfall =  0.522(In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ U n i t  H y d r o g r a p h
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Interval          'S' Graph          Unit Hydrograph
Number            Mean values             ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ (K =        48.13 (CFS))
679
1                6.220                   2.994
2               39.874                  16.198
3               80.296                  19.457
4               94.943                   7.050
5               98.536                   1.729
6              100.000                   0.705
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Total soil rain loss =      0.12(In)
Total effective rainfall =      0.40(In)
Peak flow rate in flood hydrograph =      4.43(CFS)
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 ‐ H O U R    S T O R M
R u n o f f      H y d r o g r a p h
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Hydrograph in   5   Minute intervals ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Time(h+m) Volume Ac.Ft   Q(CFS)  0        2.5       5.0       7.5      10.0 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 0+ 5       0.0000      0.00  Q         |         |         |         | 0+10       0.0000      0.00  Q         |         |         |         | 0+15       0.0000      0.00  Q         |         |         |         | 0+20       0.0000      0.00  Q         |         |         |         | 0+25       0.0000      0.00  Q         |         |         |         | 0+30       0.0000      0.00  Q         |         |         |         | 0+35       0.0000      0.00  Q         |         |         |         | 0+40       0.0000      0.00  Q         |         |         |         | 0+45       0.0000      0.00  Q         |         |         |         | 0+50       0.0000      0.00  Q         |         |         |         | 0+55       0.0000      0.00  Q         |         |         |         | 1+ 0       0.0000      0.00  Q         |         |         |         | 1+ 5       0.0000      0.00  Q         |         |         |         | 1+10       0.0000      0.00  Q         |         |         |         | 1+15       0.0000      0.00  Q         |         |         |         | 1+20       0.0000      0.00  Q         |         |         |         | 1+25       0.0000      0.00  Q         |         |         |         | 1+30       0.0000      0.00  Q         |         |         |         | 1+35       0.0000      0.00  Q         |         |         |         | 1+40       0.0000      0.00  Q         |         |         |         | 1+45       0.0000      0.00  Q         |         |         |         | 1+50       0.0000      0.00  Q         |         |         |         | 1+55       0.0000      0.00  Q         |         |         |         | 2+ 0       0.0000      0.00  Q         |         |         |         | 2+ 5       0.0000      0.00  Q         |         |         |         | 2+10       0.0000      0.00  Q         |         |         |         | 2+15       0.0000      0.00  Q         |         |         |         | 2+20       0.0000      0.00  Q         |         |         |         | 2+25       0.0000      0.00  Q         |         |         |         | 680
2+30       0.0000      0.00  Q         |         |         |         | 2+35       0.0000      0.00  Q         |         |         |         | 2+40       0.0000      0.00  Q         |         |         |         | 2+45       0.0000      0.00  Q         |         |         |         | 2+50       0.0000      0.00  Q         |         |         |         | 2+55       0.0000      0.00  Q         |         |         |         | 3+ 0       0.0000      0.00  Q         |         |         |         | 3+ 5       0.0000      0.00  Q         |         |         |         | 3+10       0.0000      0.00  Q         |         |         |         | 3+15       0.0000      0.00  Q         |         |         |         | 3+20       0.0000      0.00  Q         |         |         |         | 3+25       0.0000      0.00  Q         |         |         |         | 3+30       0.0000      0.00  Q         |         |         |         | 3+35       0.0000      0.00  Q         |         |         |         | 3+40       0.0000      0.00  Q         |         |         |         | 3+45       0.0000      0.00  Q         |         |         |         | 3+50       0.0000      0.00  Q         |         |         |         | 3+55       0.0000      0.00  Q         |         |         |         | 4+ 0       0.0000      0.00  Q         |         |         |         | 4+ 5       0.0000      0.00  Q         |         |         |         | 4+10       0.0000      0.00  Q         |         |         |         | 4+15       0.0000      0.00  Q         |         |         |         | 4+20       0.0000      0.00  Q         |         |         |         | 4+25       0.0000      0.00  Q         |         |         |         | 4+30       0.0000      0.00  Q         |         |         |         | 4+35       0.0000      0.00  Q         |         |         |         | 4+40       0.0000      0.00  Q         |         |         |         | 4+45       0.0000      0.00  Q         |         |         |         | 4+50       0.0000      0.00  Q         |         |         |         | 4+55       0.0000      0.00  Q         |         |         |         | 5+ 0       0.0000      0.00  Q         |         |         |         | 5+ 5       0.0000      0.00  Q         |         |         |         | 5+10       0.0000      0.00  Q         |         |         |         | 5+15       0.0000      0.00  Q         |         |         |         | 5+20       0.0000      0.00  Q         |         |         |         | 5+25       0.0000      0.00  Q         |         |         |         | 5+30       0.0000      0.00  Q         |         |         |         | 5+35       0.0000      0.00  Q         |         |         |         | 5+40       0.0000      0.00  Q         |         |         |         | 5+45       0.0000      0.00  Q         |         |         |         | 5+50       0.0000      0.00  Q         |         |         |         | 5+55       0.0000      0.00  Q         |         |         |         | 6+ 0       0.0000      0.00  Q         |         |         |         | 6+ 5       0.0000      0.00  Q         |         |         |         | 6+10       0.0000      0.00  Q         |         |         |         | 6+15       0.0000      0.00  Q         |         |         |         | 6+20       0.0000      0.00  Q         |         |         |         | 6+25       0.0000      0.00  Q         |         |         |         | 6+30       0.0000      0.00  Q         |         |         |         | 6+35       0.0000      0.00  Q         |         |         |         | 681
6+40       0.0000      0.00  Q         |         |         |         | 6+45       0.0000      0.00  Q         |         |         |         | 6+50       0.0000      0.00  Q         |         |         |         | 6+55       0.0000      0.00  Q         |         |         |         | 7+ 0       0.0001      0.00  Q         |         |         |         | 7+ 5       0.0001      0.00  Q         |         |         |         | 7+10       0.0001      0.00  Q         |         |         |         | 7+15       0.0001      0.00  Q         |         |         |         | 7+20       0.0001      0.00  Q         |         |         |         | 7+25       0.0001      0.00  Q         |         |         |         | 7+30       0.0001      0.00  Q         |         |         |         | 7+35       0.0001      0.00  Q         |         |         |         | 7+40       0.0001      0.00  Q         |         |         |         | 7+45       0.0001      0.00  Q         |         |         |         | 7+50       0.0001      0.00  Q         |         |         |         | 7+55       0.0001      0.00  Q         |         |         |         | 8+ 0       0.0001      0.00  Q         |         |         |         | 8+ 5       0.0001      0.00  Q         |         |         |         | 8+10       0.0001      0.00  Q         |         |         |         | 8+15       0.0001      0.00  Q         |         |         |         | 8+20       0.0001      0.00  Q         |         |         |         | 8+25       0.0001      0.00  Q         |         |         |         | 8+30       0.0001      0.00  Q         |         |         |         | 8+35       0.0001      0.00  Q         |         |         |         | 8+40       0.0001      0.00  Q         |         |         |         | 8+45       0.0001      0.00  Q         |         |         |         | 8+50       0.0001      0.00  Q         |         |         |         | 8+55       0.0001      0.00  Q         |         |         |         | 9+ 0       0.0001      0.00  Q         |         |         |         | 9+ 5       0.0001      0.00  Q         |         |         |         | 9+10       0.0001      0.00  Q         |         |         |         | 9+15       0.0001      0.00  Q         |         |         |         | 9+20       0.0001      0.00  Q         |         |         |         | 9+25       0.0001      0.00  Q         |         |         |         | 9+30       0.0001      0.00  Q         |         |         |         | 9+35       0.0001      0.00  Q         |         |         |         | 9+40       0.0001      0.00  Q         |         |         |         | 9+45       0.0001      0.00  Q         |         |         |         | 9+50       0.0001      0.00  Q         |         |         |         | 9+55       0.0001      0.00  Q         |         |         |         | 10+ 0       0.0001      0.00  Q         |         |         |         | 10+ 5       0.0001      0.00  Q         |         |         |         | 10+10       0.0001      0.00  Q         |         |         |         | 10+15       0.0001      0.00  Q         |         |         |         | 10+20       0.0001      0.00  Q         |         |         |         | 10+25       0.0001      0.00  Q         |         |         |         | 10+30       0.0001      0.00  Q         |         |         |         | 10+35       0.0001      0.00  Q         |         |         |         | 10+40       0.0001      0.00  Q         |         |         |         | 10+45       0.0001      0.00  Q         |         |         |         | 682
10+50       0.0001      0.00  Q         |         |         |         | 10+55       0.0001      0.00  Q         |         |         |         | 11+ 0       0.0001      0.00  Q         |         |         |         | 11+ 5       0.0001      0.00  Q         |         |         |         | 11+10       0.0001      0.00  Q         |         |         |         | 11+15       0.0001      0.00  Q         |         |         |         | 11+20       0.0001      0.00  Q         |         |         |         | 11+25       0.0001      0.00  Q         |         |         |         | 11+30       0.0001      0.00  Q         |         |         |         | 11+35       0.0001      0.00  Q         |         |         |         | 11+40       0.0001      0.00  Q         |         |         |         | 11+45       0.0001      0.00  Q         |         |         |         | 11+50       0.0001      0.00  Q         |         |         |         | 11+55       0.0001      0.00  Q         |         |         |         | 12+ 0       0.0001      0.00  Q         |         |         |         | 12+ 5       0.0001      0.00  Q         |         |         |         | 12+10       0.0001      0.00  Q         |         |         |         | 12+15       0.0001      0.00  Q         |         |         |         | 12+20       0.0001      0.00  Q         |         |         |         | 12+25       0.0001      0.00  Q         |         |         |         | 12+30       0.0001      0.00  Q         |         |         |         | 12+35       0.0001      0.00  Q         |         |         |         | 12+40       0.0001      0.00  Q         |         |         |         | 12+45       0.0002      0.00  Q         |         |         |         | 12+50       0.0002      0.00  Q         |         |         |         | 12+55       0.0002      0.00  Q         |         |         |         | 13+ 0       0.0002      0.00  Q         |         |         |         | 13+ 5       0.0002      0.00  Q         |         |         |         | 13+10       0.0002      0.00  Q         |         |         |         | 13+15       0.0002      0.00  Q         |         |         |         | 13+20       0.0002      0.00  Q         |         |         |         | 13+25       0.0002      0.00  Q         |         |         |         | 13+30       0.0002      0.00  Q         |         |         |         | 13+35       0.0002      0.00  Q         |         |         |         | 13+40       0.0002      0.00  Q         |         |         |         | 13+45       0.0002      0.00  Q         |         |         |         | 13+50       0.0002      0.00  Q         |         |         |         | 13+55       0.0002      0.00  Q         |         |         |         | 14+ 0       0.0002      0.00  Q         |         |         |         | 14+ 5       0.0002      0.00  Q         |         |         |         | 14+10       0.0002      0.00  Q         |         |         |         | 14+15       0.0002      0.00  Q         |         |         |         | 14+20       0.0002      0.00  Q         |         |         |         | 14+25       0.0002      0.00  Q         |         |         |         | 14+30       0.0003      0.00  Q         |         |         |         | 14+35       0.0003      0.00  Q         |         |         |         | 14+40       0.0003      0.00  Q         |         |         |         | 14+45       0.0003      0.00  Q         |         |         |         | 14+50       0.0003      0.00  Q         |         |         |         | 14+55       0.0003      0.00  Q         |         |         |         | 683
15+ 0       0.0003      0.00  Q         |         |         |         | 15+ 5       0.0003      0.00  Q         |         |         |         | 15+10       0.0003      0.00  Q         |         |         |         | 15+15       0.0003      0.00  Q         |         |         |         | 15+20       0.0003      0.00  Q         |         |         |         | 15+25       0.0005      0.03  Q         |         |         |         | 15+30       0.0018      0.19  Q         |         |         |         | 15+35       0.0046      0.40  |Q        |         |         |         | 15+40       0.0081      0.51  | Q       |         |         |         | 15+45       0.0121      0.59  | QV      |         |         |         | 15+50       0.0170      0.70  | Q  V    |         |         |         | 15+55       0.0231      0.89  |  Q  V   |         |         |         | 16+ 0       0.0318      1.26  |    Q   V|         |         |         | 16+ 5       0.0470      2.22  |       Q |   V     |         |         | 16+10       0.0767      4.30  |         |      Q  | V       |         | 16+15       0.1072      4.43  |         |      Q  |         | V       | 16+20       0.1221      2.16  |       Q |         |         |     V   | 16+25       0.1289      1.00  |  Q      |         |         |       V | 16+30       0.1323      0.49  |Q        |         |         |        V| 16+35       0.1332      0.12  Q         |         |         |        V| 16+40       0.1334      0.03  Q         |         |         |        V| 16+45       0.1335      0.01  Q         |         |         |        V| 16+50       0.1335      0.00  Q         |         |         |        V| 16+55       0.1335      0.00  Q         |         |         |        V| 17+ 0       0.1335      0.00  Q         |         |         |        V| 17+ 5       0.1335      0.00  Q         |         |         |        V| 17+10       0.1335      0.00  Q         |         |         |        V| 17+15       0.1335      0.00  Q         |         |         |        V| 17+20       0.1335      0.00  Q         |         |         |        V| 17+25       0.1335      0.00  Q         |         |         |        V| 17+30       0.1335      0.00  Q         |         |         |        V| 17+35       0.1335      0.00  Q         |         |         |        V| 17+40       0.1335      0.00  Q         |         |         |        V| 17+45       0.1335      0.00  Q         |         |         |        V| 17+50       0.1335      0.00  Q         |         |         |        V| 17+55       0.1335      0.00  Q         |         |         |        V| 18+ 0       0.1335      0.00  Q         |         |         |        V| 18+ 5       0.1335      0.00  Q         |         |         |        V| 18+10       0.1335      0.00  Q         |         |         |        V| 18+15       0.1335      0.00  Q         |         |         |        V| 18+20       0.1335      0.00  Q         |         |         |        V| 18+25       0.1335      0.00  Q         |         |         |        V| 18+30       0.1335      0.00  Q         |         |         |        V| 18+35       0.1335      0.00  Q         |         |         |        V| 18+40       0.1335      0.00  Q         |         |         |        V| 18+45       0.1335      0.00  Q         |         |         |        V| 18+50       0.1335      0.00  Q         |         |         |        V| 18+55       0.1335      0.00  Q         |         |         |        V| 19+ 0       0.1335      0.00  Q         |         |         |        V| 19+ 5       0.1335      0.00  Q         |         |         |        V| 684
19+10       0.1335      0.00  Q         |         |         |        V| 19+15       0.1335      0.00  Q         |         |         |        V| 19+20       0.1335      0.00  Q         |         |         |        V| 19+25       0.1335      0.00  Q         |         |         |        V| 19+30       0.1335      0.00  Q         |         |         |        V| 19+35       0.1335      0.00  Q         |         |         |        V| 19+40       0.1335      0.00  Q         |         |         |        V| 19+45       0.1335      0.00  Q         |         |         |        V| 19+50       0.1335      0.00  Q         |         |         |        V| 19+55       0.1335      0.00  Q         |         |         |        V| 20+ 0       0.1335      0.00  Q         |         |         |        V| 20+ 5       0.1335      0.00  Q         |         |         |        V| 20+10       0.1335      0.00  Q         |         |         |        V| 20+15       0.1335      0.00  Q         |         |         |        V| 20+20       0.1336      0.00  Q         |         |         |        V| 20+25       0.1336      0.00  Q         |         |         |        V| 20+30       0.1336      0.00  Q         |         |         |        V| 20+35       0.1336      0.00  Q         |         |         |        V| 20+40       0.1336      0.00  Q         |         |         |        V| 20+45       0.1336      0.00  Q         |         |         |        V| 20+50       0.1336      0.00  Q         |         |         |        V| 20+55       0.1336      0.00  Q         |         |         |        V| 21+ 0       0.1336      0.00  Q         |         |         |        V| 21+ 5       0.1336      0.00  Q         |         |         |        V| 21+10       0.1336      0.00  Q         |         |         |        V| 21+15       0.1336      0.00  Q         |         |         |        V| 21+20       0.1336      0.00  Q         |         |         |        V| 21+25       0.1336      0.00  Q         |         |         |        V| 21+30       0.1336      0.00  Q         |         |         |        V| 21+35       0.1336      0.00  Q         |         |         |        V| 21+40       0.1336      0.00  Q         |         |         |        V| 21+45       0.1336      0.00  Q         |         |         |        V| 21+50       0.1336      0.00  Q         |         |         |        V| 21+55       0.1336      0.00  Q         |         |         |        V| 22+ 0       0.1336      0.00  Q         |         |         |        V| 22+ 5       0.1336      0.00  Q         |         |         |        V| 22+10       0.1336      0.00  Q         |         |         |        V| 22+15       0.1336      0.00  Q         |         |         |        V| 22+20       0.1336      0.00  Q         |         |         |        V| 22+25       0.1336      0.00  Q         |         |         |        V| 22+30       0.1336      0.00  Q         |         |         |        V| 22+35       0.1336      0.00  Q         |         |         |        V| 22+40       0.1336      0.00  Q         |         |         |        V| 22+45       0.1336      0.00  Q         |         |         |        V| 22+50       0.1336      0.00  Q         |         |         |        V| 22+55       0.1336      0.00  Q         |         |         |        V| 23+ 0       0.1336      0.00  Q         |         |         |        V| 23+ 5       0.1336      0.00  Q         |         |         |        V| 23+10       0.1336      0.00  Q         |         |         |        V| 23+15       0.1336      0.00  Q         |         |         |        V| 685
23+20       0.1336      0.00  Q         |         |         |        V| 23+25       0.1336      0.00  Q         |         |         |        V| 23+30       0.1336      0.00  Q         |         |         |        V| 23+35       0.1336      0.00  Q         |         |         |        V| 23+40       0.1336      0.00  Q         |         |         |        V| 23+45       0.1336      0.00  Q         |         |         |        V| 23+50       0.1336      0.00  Q         |         |         |        V| 23+55       0.1336      0.00  Q         |         |         |        V| 24+ 0       0.1336      0.00  Q         |         |         |        V| 24+ 5       0.1336      0.00  Q         |         |         |        V| 24+10       0.1336      0.00  Q         |         |         |        V| 24+15       0.1336      0.00  Q         |         |         |        V| 24+20       0.1336      0.00  Q         |         |         |        V| 24+25       0.1336      0.00  Q         |         |         |         V ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐ 686
U n i t   H y d r o g r a p h    A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 ‐ 2004, Version 7.0 Study date  06/28/24
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ San Bernardino County Synthetic Unit Hydrology Method
Manual date ‐ August 1986
Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ JN 4113 UNIT HYDROGRAPH
10 YEAR 3 HOUR STORM  POST‐DEVELOPED
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Storm Event Year = 10
Antecedent Moisture Condition = 2
English (in‐lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
Area averaged rainfall intensity isohyetal data:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 10

3.98 1 0.92
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Rainfall data for year 10

3.98 6 0.41
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Rainfall data for year 10

3.98 24 0.19
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ********
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 2) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)

32.0      32.0          3.98      1.000     0.978    0.130    0.127 Area‐averaged adjusted loss rate Fm (In/Hr) =  0.127
********* Area‐Averaged low loss rate fraction, Yb ********** Area       Area          SCS CN    SCS CN      S     Pervious 687
(Ac.)      Fract         (AMC2)    (AMC2)           Yield Fr

0.52 0.130 32.0 32.0 4.59 0.000

3.46   0.870         98.0      98.0       0.20     0.775 Area‐averaged catchment yield fraction, Y =  0.674
Area‐averaged low loss fraction, Yb =  0.326
User entry of time of concentration  =   0.176 (hours)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Watershed area =       3.98(Ac.)
Catchment Lag time =   0.141 hours
Unit interval =   5.000 minutes
Unit interval percentage of lag time = 59.2125
Hydrograph baseflow =     0.00(CFS)
Average maximum watershed loss rate(Fm) =  0.127(In/Hr) Average low loss rate fraction (Yb) = 0.326 (decimal)
VALLEY DEVELOPED S‐Graph Selected
Computed peak 5‐minute rainfall =  0.339(In)
Computed peak 30‐minute rainfall =  0.693(In)
Specified peak 1‐hour rainfall =  0.915(In)
Computed peak 3‐hour rainfall =  0.915(In)
Specified peak 6‐hour rainfall =  0.916(In)
Specified peak 24‐hour rainfall =  0.917(In)
Note: user specified rainfall values used.

Rainfall depth area reduction factors:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 10

32.0 32.0 3.98 1.000 0.978 0.130 0.127 Area‐averaged adjusted loss rate Fm (In/Hr) = 0.127
********* Area‐Averaged low loss rate fraction, Yb ********** 691
Area Area SCS CN SCS CN S Pervious (Ac.) Fract (AMC2) (AMC2) Yield Fr

0.52 0.130 32.0 32.0 4.59 0.000

Rainfall depth area reduction factors:

Using a total area of       3.98(Ac.) (Ref: fig. E‐4)
5‐minute factor = 1.000     Adjusted rainfall =  0.339(In) 30‐minute factor = 1.000    Adjusted rainfall =  0.693(In) 1‐hour factor = 1.000       Adjusted rainfall =  0.915(In) 3‐hour factor = 1.000       Adjusted rainfall =  0.915(In) 6‐hour factor = 1.000       Adjusted rainfall =  0.916(In) 24‐hour factor = 1.000      Adjusted rainfall =  0.917(In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ U n i t  H y d r o g r a p h
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Interval          'S' Graph          Unit Hydrograph
Number            Mean values             ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ (K =        48.13 (CFS))
1                6.354                   3.058
2               40.669                  16.517
3               80.945                  19.386
4               95.214                   6.868
5               98.595                   1.627
6              100.000                   0.676
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Total soil rain loss =      0.13(In)
692
Total effective rainfall =      0.79(In)
Peak flow rate in flood hydrograph =      8.16(CFS)
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 ‐ H O U R    S T O R M
R u n o f f      H y d r o g r a p h
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Hydrograph in   5   Minute intervals ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Time(h+m) Volume Ac.Ft   Q(CFS)  0        2.5       5.0       7.5      10.0 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 0+ 5       0.0000      0.00  Q         |         |         |         | 0+10       0.0000      0.00  Q         |         |         |         | 0+15       0.0000      0.00  Q         |         |         |         | 0+20       0.0000      0.00  Q         |         |         |         | 0+25       0.0000      0.00  Q         |         |         |         | 0+30       0.0000      0.00  Q         |         |         |         | 0+35       0.0000      0.00  Q         |         |         |         | 0+40       0.0000      0.00  Q         |         |         |         | 0+45       0.0000      0.00  Q         |         |         |         | 0+50       0.0000      0.00  Q         |         |         |         | 0+55       0.0000      0.00  Q         |         |         |         | 1+ 0       0.0000      0.00  Q         |         |         |         | 1+ 5       0.0000      0.00  Q         |         |         |         | 1+10       0.0000      0.00  Q         |         |         |         | 1+15       0.0000      0.00  Q         |         |         |         | 1+20       0.0000      0.00  Q         |         |         |         | 1+25       0.0000      0.00  Q         |         |         |         | 1+30       0.0000      0.00  Q         |         |         |         | 1+35       0.0000      0.00  Q         |         |         |         | 1+40       0.0000      0.00  Q         |         |         |         | 1+45       0.0000      0.00  Q         |         |         |         | 1+50       0.0000      0.00  Q         |         |         |         | 1+55       0.0000      0.00  Q         |         |         |         | 2+ 0       0.0000      0.00  Q         |         |         |         | 2+ 5       0.0000      0.00  Q         |         |         |         | 2+10       0.0000      0.00  Q         |         |         |         | 2+15       0.0000      0.00  Q         |         |         |         | 2+20       0.0000      0.00  Q         |         |         |         | 2+25       0.0000      0.00  Q         |         |         |         | 2+30       0.0000      0.00  Q         |         |         |         | 2+35       0.0000      0.00  Q         |         |         |         | 2+40       0.0000      0.00  Q         |         |         |         | 2+45       0.0000      0.00  Q         |         |         |         | 2+50       0.0000      0.00  Q         |         |         |         | 2+55       0.0000      0.00  Q         |         |         |         | 3+ 0       0.0000      0.00  Q         |         |         |         | 3+ 5       0.0000      0.00  Q         |         |         |         | 3+10       0.0000      0.00  Q         |         |         |         | 3+15       0.0000      0.00  Q         |         |         |         | 693
3+20       0.0000      0.00  Q         |         |         |         | 3+25       0.0000      0.00  Q         |         |         |         | 3+30       0.0000      0.00  Q         |         |         |         | 3+35       0.0000      0.00  Q         |         |         |         | 3+40       0.0000      0.00  Q         |         |         |         | 3+45       0.0000      0.00  Q         |         |         |         | 3+50       0.0000      0.00  Q         |         |         |         | 3+55       0.0000      0.00  Q         |         |         |         | 4+ 0       0.0000      0.00  Q         |         |         |         | 4+ 5       0.0000      0.00  Q         |         |         |         | 4+10       0.0000      0.00  Q         |         |         |         | 4+15       0.0000      0.00  Q         |         |         |         | 4+20       0.0000      0.00  Q         |         |         |         | 4+25       0.0000      0.00  Q         |         |         |         | 4+30       0.0000      0.00  Q         |         |         |         | 4+35       0.0000      0.00  Q         |         |         |         | 4+40       0.0000      0.00  Q         |         |         |         | 4+45       0.0000      0.00  Q         |         |         |         | 4+50       0.0000      0.00  Q         |         |         |         | 4+55       0.0000      0.00  Q         |         |         |         | 5+ 0       0.0000      0.00  Q         |         |         |         | 5+ 5       0.0000      0.00  Q         |         |         |         | 5+10       0.0000      0.00  Q         |         |         |         | 5+15       0.0000      0.00  Q         |         |         |         | 5+20       0.0000      0.00  Q         |         |         |         | 5+25       0.0000      0.00  Q         |         |         |         | 5+30       0.0000      0.00  Q         |         |         |         | 5+35       0.0000      0.00  Q         |         |         |         | 5+40       0.0000      0.00  Q         |         |         |         | 5+45       0.0000      0.00  Q         |         |         |         | 5+50       0.0000      0.00  Q         |         |         |         | 5+55       0.0000      0.00  Q         |         |         |         | 6+ 0       0.0000      0.00  Q         |         |         |         | 6+ 5       0.0001      0.00  Q         |         |         |         | 6+10       0.0001      0.00  Q         |         |         |         | 6+15       0.0001      0.00  Q         |         |         |         | 6+20       0.0001      0.00  Q         |         |         |         | 6+25       0.0001      0.00  Q         |         |         |         | 6+30       0.0001      0.00  Q         |         |         |         | 6+35       0.0001      0.00  Q         |         |         |         | 6+40       0.0001      0.00  Q         |         |         |         | 6+45       0.0001      0.00  Q         |         |         |         | 6+50       0.0001      0.00  Q         |         |         |         | 6+55       0.0001      0.00  Q         |         |         |         | 7+ 0       0.0001      0.00  Q         |         |         |         | 7+ 5       0.0001      0.00  Q         |         |         |         | 7+10       0.0001      0.00  Q         |         |         |         | 7+15       0.0001      0.00  Q         |         |         |         | 7+20       0.0001      0.00  Q         |         |         |         | 7+25       0.0001      0.00  Q         |         |         |         | 694
7+30       0.0001      0.00  Q         |         |         |         | 7+35       0.0001      0.00  Q         |         |         |         | 7+40       0.0001      0.00  Q         |         |         |         | 7+45       0.0001      0.00  Q         |         |         |         | 7+50       0.0001      0.00  Q         |         |         |         | 7+55       0.0001      0.00  Q         |         |         |         | 8+ 0       0.0001      0.00  Q         |         |         |         | 8+ 5       0.0001      0.00  Q         |         |         |         | 8+10       0.0001      0.00  Q         |         |         |         | 8+15       0.0001      0.00  Q         |         |         |         | 8+20       0.0001      0.00  Q         |         |         |         | 8+25       0.0001      0.00  Q         |         |         |         | 8+30       0.0001      0.00  Q         |         |         |         | 8+35       0.0001      0.00  Q         |         |         |         | 8+40       0.0001      0.00  Q         |         |         |         | 8+45       0.0001      0.00  Q         |         |         |         | 8+50       0.0001      0.00  Q         |         |         |         | 8+55       0.0001      0.00  Q         |         |         |         | 9+ 0       0.0001      0.00  Q         |         |         |         | 9+ 5       0.0001      0.00  Q         |         |         |         | 9+10       0.0001      0.00  Q         |         |         |         | 9+15       0.0001      0.00  Q         |         |         |         | 9+20       0.0001      0.00  Q         |         |         |         | 9+25       0.0001      0.00  Q         |         |         |         | 9+30       0.0001      0.00  Q         |         |         |         | 9+35       0.0001      0.00  Q         |         |         |         | 9+40       0.0001      0.00  Q         |         |         |         | 9+45       0.0001      0.00  Q         |         |         |         | 9+50       0.0001      0.00  Q         |         |         |         | 9+55       0.0001      0.00  Q         |         |         |         | 10+ 0       0.0001      0.00  Q         |         |         |         | 10+ 5       0.0001      0.00  Q         |         |         |         | 10+10       0.0001      0.00  Q         |         |         |         | 10+15       0.0001      0.00  Q         |         |         |         | 10+20       0.0001      0.00  Q         |         |         |         | 10+25       0.0001      0.00  Q         |         |         |         | 10+30       0.0001      0.00  Q         |         |         |         | 10+35       0.0001      0.00  Q         |         |         |         | 10+40       0.0001      0.00  Q         |         |         |         | 10+45       0.0001      0.00  Q         |         |         |         | 10+50       0.0001      0.00  Q         |         |         |         | 10+55       0.0001      0.00  Q         |         |         |         | 11+ 0       0.0001      0.00  Q         |         |         |         | 11+ 5       0.0001      0.00  Q         |         |         |         | 11+10       0.0001      0.00  Q         |         |         |         | 11+15       0.0001      0.00  Q         |         |         |         | 11+20       0.0001      0.00  Q         |         |         |         | 11+25       0.0001      0.00  Q         |         |         |         | 11+30       0.0001      0.00  Q         |         |         |         | 11+35       0.0001      0.00  Q         |         |         |         | 695
11+40       0.0001      0.00  Q         |         |         |         | 11+45       0.0001      0.00  Q         |         |         |         | 11+50       0.0001      0.00  Q         |         |         |         | 11+55       0.0001      0.00  Q         |         |         |         | 12+ 0       0.0001      0.00  Q         |         |         |         | 12+ 5       0.0001      0.00  Q         |         |         |         | 12+10       0.0002      0.00  Q         |         |         |         | 12+15       0.0002      0.00  Q         |         |         |         | 12+20       0.0002      0.00  Q         |         |         |         | 12+25       0.0002      0.00  Q         |         |         |         | 12+30       0.0002      0.00  Q         |         |         |         | 12+35       0.0002      0.00  Q         |         |         |         | 12+40       0.0002      0.00  Q         |         |         |         | 12+45       0.0002      0.00  Q         |         |         |         | 12+50       0.0002      0.00  Q         |         |         |         | 12+55       0.0002      0.00  Q         |         |         |         | 13+ 0       0.0002      0.00  Q         |         |         |         | 13+ 5       0.0002      0.00  Q         |         |         |         | 13+10       0.0002      0.00  Q         |         |         |         | 13+15       0.0002      0.00  Q         |         |         |         | 13+20       0.0002      0.00  Q         |         |         |         | 13+25       0.0002      0.00  Q         |         |         |         | 13+30       0.0002      0.00  Q         |         |         |         | 13+35       0.0002      0.00  Q         |         |         |         | 13+40       0.0003      0.00  Q         |         |         |         | 13+45       0.0003      0.00  Q         |         |         |         | 13+50       0.0003      0.00  Q         |         |         |         | 13+55       0.0003      0.00  Q         |         |         |         | 14+ 0       0.0003      0.00  Q         |         |         |         | 14+ 5       0.0003      0.00  Q         |         |         |         | 14+10       0.0003      0.00  Q         |         |         |         | 14+15       0.0003      0.00  Q         |         |         |         | 14+20       0.0003      0.00  Q         |         |         |         | 14+25       0.0003      0.00  Q         |         |         |         | 14+30       0.0003      0.00  Q         |         |         |         | 14+35       0.0003      0.00  Q         |         |         |         | 14+40       0.0003      0.00  Q         |         |         |         | 14+45       0.0003      0.00  Q         |         |         |         | 14+50       0.0003      0.00  Q         |         |         |         | 14+55       0.0003      0.00  Q         |         |         |         | 15+ 0       0.0003      0.00  Q         |         |         |         | 15+ 5       0.0003      0.00  Q         |         |         |         | 15+10       0.0003      0.00  Q         |         |         |         | 15+15       0.0003      0.00  Q         |         |         |         | 15+20       0.0003      0.00  Q         |         |         |         | 15+25       0.0008      0.06  Q         |         |         |         | 15+30       0.0036      0.42  VQ        |         |         |         | 15+35       0.0096      0.86  |V Q      |         |         |         | 15+40       0.0173      1.12  | V Q     |         |         |         | 15+45       0.0264      1.32  |   VQ    |         |         |         | 696
15+50       0.0372      1.58  |    VQ   |         |         |         | 15+55       0.0507      1.95  |      Q  |         |         |         | 16+ 0       0.0687      2.61  |         Q         |         |         | 16+ 5       0.0984      4.32  |         |    V Q  |         |         | 16+10       0.1538      8.04  |         |         |  V      | Q       | 16+15       0.2099      8.16  |         |         |         | Q       | 16+20       0.2383      4.12  |         |     Q   |         |     V   | 16+25       0.2523      2.02  |       Q |         |         |       V | 16+30       0.2592      1.01  |   Q     |         |         |        V| 16+35       0.2610      0.26  |Q        |         |         |        V| 16+40       0.2615      0.06  Q         |         |         |        V| 16+45       0.2616      0.02  Q         |         |         |        V| 16+50       0.2616      0.00  Q         |         |         |        V| 16+55       0.2616      0.00  Q         |         |         |        V| 17+ 0       0.2616      0.00  Q         |         |         |        V| 17+ 5       0.2616      0.00  Q         |         |         |        V| 17+10       0.2616      0.00  Q         |         |         |        V| 17+15       0.2616      0.00  Q         |         |         |        V| 17+20       0.2616      0.00  Q         |         |         |        V| 17+25       0.2616      0.00  Q         |         |         |        V| 17+30       0.2616      0.00  Q         |         |         |        V| 17+35       0.2616      0.00  Q         |         |         |        V| 17+40       0.2616      0.00  Q         |         |         |        V| 17+45       0.2616      0.00  Q         |         |         |        V| 17+50       0.2616      0.00  Q         |         |         |        V| 17+55       0.2617      0.00  Q         |         |         |        V| 18+ 0       0.2617      0.00  Q         |         |         |        V| 18+ 5       0.2617      0.00  Q         |         |         |        V| 18+10       0.2617      0.00  Q         |         |         |        V| 18+15       0.2617      0.00  Q         |         |         |        V| 18+20       0.2617      0.00  Q         |         |         |        V| 18+25       0.2617      0.00  Q         |         |         |        V| 18+30       0.2617      0.00  Q         |         |         |        V| 18+35       0.2617      0.00  Q         |         |         |        V| 18+40       0.2617      0.00  Q         |         |         |        V| 18+45       0.2617      0.00  Q         |         |         |        V| 18+50       0.2617      0.00  Q         |         |         |        V| 18+55       0.2617      0.00  Q         |         |         |        V| 19+ 0       0.2617      0.00  Q         |         |         |        V| 19+ 5       0.2617      0.00  Q         |         |         |        V| 19+10       0.2617      0.00  Q         |         |         |        V| 19+15       0.2617      0.00  Q         |         |         |        V| 19+20       0.2617      0.00  Q         |         |         |        V| 19+25       0.2617      0.00  Q         |         |         |        V| 19+30       0.2617      0.00  Q         |         |         |        V| 19+35       0.2617      0.00  Q         |         |         |        V| 19+40       0.2617      0.00  Q         |         |         |        V| 19+45       0.2617      0.00  Q         |         |         |        V| 19+50       0.2617      0.00  Q         |         |         |        V| 19+55       0.2617      0.00  Q         |         |         |        V| 697
20+ 0       0.2617      0.00  Q         |         |         |        V| 20+ 5       0.2617      0.00  Q         |         |         |        V| 20+10       0.2617      0.00  Q         |         |         |        V| 20+15       0.2617      0.00  Q         |         |         |        V| 20+20       0.2617      0.00  Q         |         |         |        V| 20+25       0.2617      0.00  Q         |         |         |        V| 20+30       0.2617      0.00  Q         |         |         |        V| 20+35       0.2617      0.00  Q         |         |         |        V| 20+40       0.2617      0.00  Q         |         |         |        V| 20+45       0.2617      0.00  Q         |         |         |        V| 20+50       0.2617      0.00  Q         |         |         |        V| 20+55       0.2617      0.00  Q         |         |         |        V| 21+ 0       0.2617      0.00  Q         |         |         |        V| 21+ 5       0.2617      0.00  Q         |         |         |        V| 21+10       0.2617      0.00  Q         |         |         |        V| 21+15       0.2617      0.00  Q         |         |         |        V| 21+20       0.2617      0.00  Q         |         |         |        V| 21+25       0.2617      0.00  Q         |         |         |        V| 21+30       0.2617      0.00  Q         |         |         |        V| 21+35       0.2617      0.00  Q         |         |         |        V| 21+40       0.2617      0.00  Q         |         |         |        V| 21+45       0.2617      0.00  Q         |         |         |        V| 21+50       0.2617      0.00  Q         |         |         |        V| 21+55       0.2617      0.00  Q         |         |         |        V| 22+ 0       0.2617      0.00  Q         |         |         |        V| 22+ 5       0.2617      0.00  Q         |         |         |        V| 22+10       0.2617      0.00  Q         |         |         |        V| 22+15       0.2617      0.00  Q         |         |         |        V| 22+20       0.2617      0.00  Q         |         |         |        V| 22+25       0.2617      0.00  Q         |         |         |        V| 22+30       0.2617      0.00  Q         |         |         |        V| 22+35       0.2617      0.00  Q         |         |         |        V| 22+40       0.2617      0.00  Q         |         |         |        V| 22+45       0.2617      0.00  Q         |         |         |        V| 22+50       0.2617      0.00  Q         |         |         |        V| 22+55       0.2617      0.00  Q         |         |         |        V| 23+ 0       0.2617      0.00  Q         |         |         |        V| 23+ 5       0.2617      0.00  Q         |         |         |        V| 23+10       0.2617      0.00  Q         |         |         |        V| 23+15       0.2617      0.00  Q         |         |         |        V| 23+20       0.2617      0.00  Q         |         |         |        V| 23+25       0.2617      0.00  Q         |         |         |        V| 23+30       0.2617      0.00  Q         |         |         |        V| 23+35       0.2617      0.00  Q         |         |         |        V| 23+40       0.2617      0.00  Q         |         |         |        V| 23+45       0.2617      0.00  Q         |         |         |        V| 23+50       0.2617      0.00  Q         |         |         |        V| 23+55       0.2617      0.00  Q         |         |         |        V| 24+ 0       0.2617      0.00  Q         |         |         |        V| 24+ 5       0.2617      0.00  Q         |         |         |        V| 698
24+10       0.2617      0.00  Q         |         |         |        V| 24+15       0.2617      0.00  Q         |         |         |        V| 24+20       0.2617      0.00  Q         |         |         |        V| 24+25       0.2617      0.00  Q         |         |         |        V| ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐ 699
U n i t   H y d r o g r a p h    A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 ‐ 2004, Version 7.0 Study date  07/24/24
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ San Bernardino County Synthetic Unit Hydrology Method
Manual date ‐ August 1986
Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ JN 4113 UNIT HYDROGRAPH
25 YEAR 3 HOUR STORM  POST‐DEVELOPED
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Storm Event Year = 25
Antecedent Moisture Condition = 2
English (in‐lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
Area averaged rainfall intensity isohyetal data:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 10

3.98 24 0.29
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ********
700
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 2) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)

0.52 0.130 32.0 32.0 5.71 0.000

3.46   0.870         98.0      98.0       0.20     0.813 Area‐averaged catchment yield fraction, Y =  0.708
Area‐averaged low loss fraction, Yb =  0.292
User entry of time of concentration  =   0.175 (hours)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Watershed area =       3.98(Ac.)
Catchment Lag time =   0.140 hours
Unit interval =   5.000 minutes
Unit interval percentage of lag time = 59.4219
Hydrograph baseflow =     0.00(CFS)
Average maximum watershed loss rate(Fm) =  0.127(In/Hr) Average low loss rate fraction (Yb) = 0.292 (decimal)
VALLEY DEVELOPED S‐Graph Selected
Computed peak 5‐minute rainfall =  0.422(In)
Computed peak 30‐minute rainfall =  0.864(In)
Specified peak 1‐hour rainfall =  1.140(In)
Computed peak 3‐hour rainfall =  1.140(In)
Specified peak 6‐hour rainfall =  1.141(In)
Specified peak 24‐hour rainfall =  1.142(In)
Note: user specified rainfall values used.

Rainfall depth area reduction factors:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 10

3.98 24 0.29
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 704
******** Area‐averaged max loss rate, Fm ********
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 2) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)

0.52 0.130 32.0 32.0 5.71 0.000

Rainfall depth area reduction factors:

Using a total area of       3.98(Ac.) (Ref: fig. E‐4)
5‐minute factor = 1.000     Adjusted rainfall =  0.422(In) 30‐minute factor = 1.000    Adjusted rainfall =  0.864(In) 1‐hour factor = 1.000       Adjusted rainfall =  1.140(In) 3‐hour factor = 1.000       Adjusted rainfall =  1.140(In) 6‐hour factor = 1.000       Adjusted rainfall =  1.141(In) 24‐hour factor = 1.000      Adjusted rainfall =  1.142(In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ U n i t  H y d r o g r a p h
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Interval          'S' Graph          Unit Hydrograph
Number            Mean values             ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ (K =        48.13 (CFS))
705
1                6.397                   3.079
2               40.927                  16.620
3               81.152                  19.361
4               95.299                   6.810
5               98.613                   1.595
6              100.000                   0.668
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Total soil rain loss =      0.13(In)
Total effective rainfall =      1.01(In)
Peak flow rate in flood hydrograph =     10.27(CFS)
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 ‐ H O U R    S T O R M
R u n o f f      H y d r o g r a p h
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Hydrograph in   5   Minute intervals ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Time(h+m) Volume Ac.Ft   Q(CFS)  0        5.0      10.0      15.0      20.0 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 0+ 5       0.0000      0.00  Q         |         |         |         | 0+10       0.0000      0.00  Q         |         |         |         | 0+15       0.0000      0.00  Q         |         |         |         | 0+20       0.0000      0.00  Q         |         |         |         | 0+25       0.0000      0.00  Q         |         |         |         | 0+30       0.0000      0.00  Q         |         |         |         | 0+35       0.0000      0.00  Q         |         |         |         | 0+40       0.0000      0.00  Q         |         |         |         | 0+45       0.0000      0.00  Q         |         |         |         | 0+50       0.0000      0.00  Q         |         |         |         | 0+55       0.0000      0.00  Q         |         |         |         | 1+ 0       0.0000      0.00  Q         |         |         |         | 1+ 5       0.0000      0.00  Q         |         |         |         | 1+10       0.0000      0.00  Q         |         |         |         | 1+15       0.0000      0.00  Q         |         |         |         | 1+20       0.0000      0.00  Q         |         |         |         | 1+25       0.0000      0.00  Q         |         |         |         | 1+30       0.0000      0.00  Q         |         |         |         | 1+35       0.0000      0.00  Q         |         |         |         | 1+40       0.0000      0.00  Q         |         |         |         | 1+45       0.0000      0.00  Q         |         |         |         | 1+50       0.0000      0.00  Q         |         |         |         | 1+55       0.0000      0.00  Q         |         |         |         | 2+ 0       0.0000      0.00  Q         |         |         |         | 2+ 5       0.0000      0.00  Q         |         |         |         | 2+10       0.0000      0.00  Q         |         |         |         | 2+15       0.0000      0.00  Q         |         |         |         | 2+20       0.0000      0.00  Q         |         |         |         | 2+25       0.0000      0.00  Q         |         |         |         | 706
2+30       0.0000      0.00  Q         |         |         |         | 2+35       0.0000      0.00  Q         |         |         |         | 2+40       0.0000      0.00  Q         |         |         |         | 2+45       0.0000      0.00  Q         |         |         |         | 2+50       0.0000      0.00  Q         |         |         |         | 2+55       0.0000      0.00  Q         |         |         |         | 3+ 0       0.0000      0.00  Q         |         |         |         | 3+ 5       0.0000      0.00  Q         |         |         |         | 3+10       0.0000      0.00  Q         |         |         |         | 3+15       0.0000      0.00  Q         |         |         |         | 3+20       0.0000      0.00  Q         |         |         |         | 3+25       0.0000      0.00  Q         |         |         |         | 3+30       0.0000      0.00  Q         |         |         |         | 3+35       0.0000      0.00  Q         |         |         |         | 3+40       0.0000      0.00  Q         |         |         |         | 3+45       0.0000      0.00  Q         |         |         |         | 3+50       0.0000      0.00  Q         |         |         |         | 3+55       0.0000      0.00  Q         |         |         |         | 4+ 0       0.0000      0.00  Q         |         |         |         | 4+ 5       0.0000      0.00  Q         |         |         |         | 4+10       0.0000      0.00  Q         |         |         |         | 4+15       0.0000      0.00  Q         |         |         |         | 4+20       0.0000      0.00  Q         |         |         |         | 4+25       0.0000      0.00  Q         |         |         |         | 4+30       0.0000      0.00  Q         |         |         |         | 4+35       0.0000      0.00  Q         |         |         |         | 4+40       0.0000      0.00  Q         |         |         |         | 4+45       0.0000      0.00  Q         |         |         |         | 4+50       0.0000      0.00  Q         |         |         |         | 4+55       0.0000      0.00  Q         |         |         |         | 5+ 0       0.0000      0.00  Q         |         |         |         | 5+ 5       0.0000      0.00  Q         |         |         |         | 5+10       0.0000      0.00  Q         |         |         |         | 5+15       0.0000      0.00  Q         |         |         |         | 5+20       0.0000      0.00  Q         |         |         |         | 5+25       0.0000      0.00  Q         |         |         |         | 5+30       0.0000      0.00  Q         |         |         |         | 5+35       0.0000      0.00  Q         |         |         |         | 5+40       0.0000      0.00  Q         |         |         |         | 5+45       0.0000      0.00  Q         |         |         |         | 5+50       0.0000      0.00  Q         |         |         |         | 5+55       0.0001      0.00  Q         |         |         |         | 6+ 0       0.0001      0.00  Q         |         |         |         | 6+ 5       0.0001      0.00  Q         |         |         |         | 6+10       0.0001      0.00  Q         |         |         |         | 6+15       0.0001      0.00  Q         |         |         |         | 6+20       0.0001      0.00  Q         |         |         |         | 6+25       0.0001      0.00  Q         |         |         |         | 6+30       0.0001      0.00  Q         |         |         |         | 6+35       0.0001      0.00  Q         |         |         |         | 707
6+40       0.0001      0.00  Q         |         |         |         | 6+45       0.0001      0.00  Q         |         |         |         | 6+50       0.0001      0.00  Q         |         |         |         | 6+55       0.0001      0.00  Q         |         |         |         | 7+ 0       0.0001      0.00  Q         |         |         |         | 7+ 5       0.0001      0.00  Q         |         |         |         | 7+10       0.0001      0.00  Q         |         |         |         | 7+15       0.0001      0.00  Q         |         |         |         | 7+20       0.0001      0.00  Q         |         |         |         | 7+25       0.0001      0.00  Q         |         |         |         | 7+30       0.0001      0.00  Q         |         |         |         | 7+35       0.0001      0.00  Q         |         |         |         | 7+40       0.0001      0.00  Q         |         |         |         | 7+45       0.0001      0.00  Q         |         |         |         | 7+50       0.0001      0.00  Q         |         |         |         | 7+55       0.0001      0.00  Q         |         |         |         | 8+ 0       0.0001      0.00  Q         |         |         |         | 8+ 5       0.0001      0.00  Q         |         |         |         | 8+10       0.0001      0.00  Q         |         |         |         | 8+15       0.0001      0.00  Q         |         |         |         | 8+20       0.0001      0.00  Q         |         |         |         | 8+25       0.0001      0.00  Q         |         |         |         | 8+30       0.0001      0.00  Q         |         |         |         | 8+35       0.0001      0.00  Q         |         |         |         | 8+40       0.0001      0.00  Q         |         |         |         | 8+45       0.0001      0.00  Q         |         |         |         | 8+50       0.0001      0.00  Q         |         |         |         | 8+55       0.0001      0.00  Q         |         |         |         | 9+ 0       0.0001      0.00  Q         |         |         |         | 9+ 5       0.0001      0.00  Q         |         |         |         | 9+10       0.0001      0.00  Q         |         |         |         | 9+15       0.0001      0.00  Q         |         |         |         | 9+20       0.0001      0.00  Q         |         |         |         | 9+25       0.0001      0.00  Q         |         |         |         | 9+30       0.0001      0.00  Q         |         |         |         | 9+35       0.0001      0.00  Q         |         |         |         | 9+40       0.0001      0.00  Q         |         |         |         | 9+45       0.0001      0.00  Q         |         |         |         | 9+50       0.0001      0.00  Q         |         |         |         | 9+55       0.0001      0.00  Q         |         |         |         | 10+ 0       0.0001      0.00  Q         |         |         |         | 10+ 5       0.0001      0.00  Q         |         |         |         | 10+10       0.0001      0.00  Q         |         |         |         | 10+15       0.0001      0.00  Q         |         |         |         | 10+20       0.0001      0.00  Q         |         |         |         | 10+25       0.0001      0.00  Q         |         |         |         | 10+30       0.0001      0.00  Q         |         |         |         | 10+35       0.0001      0.00  Q         |         |         |         | 10+40       0.0001      0.00  Q         |         |         |         | 10+45       0.0001      0.00  Q         |         |         |         | 708
10+50       0.0001      0.00  Q         |         |         |         | 10+55       0.0001      0.00  Q         |         |         |         | 11+ 0       0.0001      0.00  Q         |         |         |         | 11+ 5       0.0001      0.00  Q         |         |         |         | 11+10       0.0001      0.00  Q         |         |         |         | 11+15       0.0001      0.00  Q         |         |         |         | 11+20       0.0001      0.00  Q         |         |         |         | 11+25       0.0001      0.00  Q         |         |         |         | 11+30       0.0001      0.00  Q         |         |         |         | 11+35       0.0001      0.00  Q         |         |         |         | 11+40       0.0001      0.00  Q         |         |         |         | 11+45       0.0001      0.00  Q         |         |         |         | 11+50       0.0001      0.00  Q         |         |         |         | 11+55       0.0002      0.00  Q         |         |         |         | 12+ 0       0.0002      0.00  Q         |         |         |         | 12+ 5       0.0002      0.00  Q         |         |         |         | 12+10       0.0002      0.00  Q         |         |         |         | 12+15       0.0002      0.00  Q         |         |         |         | 12+20       0.0002      0.00  Q         |         |         |         | 12+25       0.0002      0.00  Q         |         |         |         | 12+30       0.0002      0.00  Q         |         |         |         | 12+35       0.0002      0.00  Q         |         |         |         | 12+40       0.0002      0.00  Q         |         |         |         | 12+45       0.0002      0.00  Q         |         |         |         | 12+50       0.0002      0.00  Q         |         |         |         | 12+55       0.0002      0.00  Q         |         |         |         | 13+ 0       0.0002      0.00  Q         |         |         |         | 13+ 5       0.0002      0.00  Q         |         |         |         | 13+10       0.0002      0.00  Q         |         |         |         | 13+15       0.0002      0.00  Q         |         |         |         | 13+20       0.0002      0.00  Q         |         |         |         | 13+25       0.0002      0.00  Q         |         |         |         | 13+30       0.0003      0.00  Q         |         |         |         | 13+35       0.0003      0.00  Q         |         |         |         | 13+40       0.0003      0.00  Q         |         |         |         | 13+45       0.0003      0.00  Q         |         |         |         | 13+50       0.0003      0.00  Q         |         |         |         | 13+55       0.0003      0.00  Q         |         |         |         | 14+ 0       0.0003      0.00  Q         |         |         |         | 14+ 5       0.0003      0.00  Q         |         |         |         | 14+10       0.0003      0.00  Q         |         |         |         | 14+15       0.0003      0.00  Q         |         |         |         | 14+20       0.0003      0.00  Q         |         |         |         | 14+25       0.0003      0.00  Q         |         |         |         | 14+30       0.0003      0.00  Q         |         |         |         | 14+35       0.0003      0.00  Q         |         |         |         | 14+40       0.0003      0.00  Q         |         |         |         | 14+45       0.0003      0.00  Q         |         |         |         | 14+50       0.0003      0.00  Q         |         |         |         | 14+55       0.0003      0.00  Q         |         |         |         | 709
15+ 0       0.0003      0.00  Q         |         |         |         | 15+ 5       0.0003      0.00  Q         |         |         |         | 15+10       0.0003      0.00  Q         |         |         |         | 15+15       0.0003      0.00  Q         |         |         |         | 15+20       0.0003      0.00  Q         |         |         |         | 15+25       0.0009      0.09  Q         |         |         |         | 15+30       0.0048      0.57  VQ        |         |         |         | 15+35       0.0129      1.17  |VQ       |         |         |         | 15+40       0.0233      1.51  | VQ      |         |         |         | 15+45       0.0355      1.77  |  QV     |         |         |         | 15+50       0.0499      2.10  |   QV    |         |         |         | 15+55       0.0675      2.55  |    Q  V |         |         |         | 16+ 0       0.0908      3.39  |     Q   V         |         |         | 16+ 5       0.1289      5.52  |         |Q   V    |         |         | 16+10       0.1989     10.17  |         |         Q  V      |         | 16+15       0.2697     10.27  |         |         Q         | V       | 16+20       0.3057      5.24  |         Q         |         |     V   | 16+25       0.3238      2.62  |    Q    |         |         |       V | 16+30       0.3329      1.33  | Q       |         |         |        V| 16+35       0.3353      0.34  Q         |         |         |        V| 16+40       0.3358      0.08  Q         |         |         |        V| 16+45       0.3360      0.02  Q         |         |         |        V| 16+50       0.3360      0.00  Q         |         |         |        V| 16+55       0.3360      0.00  Q         |         |         |        V| 17+ 0       0.3360      0.00  Q         |         |         |        V| 17+ 5       0.3360      0.00  Q         |         |         |        V| 17+10       0.3360      0.00  Q         |         |         |        V| 17+15       0.3360      0.00  Q         |         |         |        V| 17+20       0.3360      0.00  Q         |         |         |        V| 17+25       0.3360      0.00  Q         |         |         |        V| 17+30       0.3360      0.00  Q         |         |         |        V| 17+35       0.3360      0.00  Q         |         |         |        V| 17+40       0.3360      0.00  Q         |         |         |        V| 17+45       0.3361      0.00  Q         |         |         |        V| 17+50       0.3361      0.00  Q         |         |         |        V| 17+55       0.3361      0.00  Q         |         |         |        V| 18+ 0       0.3361      0.00  Q         |         |         |        V| 18+ 5       0.3361      0.00  Q         |         |         |        V| 18+10       0.3361      0.00  Q         |         |         |        V| 18+15       0.3361      0.00  Q         |         |         |        V| 18+20       0.3361      0.00  Q         |         |         |        V| 18+25       0.3361      0.00  Q         |         |         |        V| 18+30       0.3361      0.00  Q         |         |         |        V| 18+35       0.3361      0.00  Q         |         |         |        V| 18+40       0.3361      0.00  Q         |         |         |        V| 18+45       0.3361      0.00  Q         |         |         |        V| 18+50       0.3361      0.00  Q         |         |         |        V| 18+55       0.3361      0.00  Q         |         |         |        V| 19+ 0       0.3361      0.00  Q         |         |         |        V| 19+ 5       0.3361      0.00  Q         |         |         |        V| 710
19+10       0.3361      0.00  Q         |         |         |        V| 19+15       0.3361      0.00  Q         |         |         |        V| 19+20       0.3361      0.00  Q         |         |         |        V| 19+25       0.3361      0.00  Q         |         |         |        V| 19+30       0.3361      0.00  Q         |         |         |        V| 19+35       0.3361      0.00  Q         |         |         |        V| 19+40       0.3361      0.00  Q         |         |         |        V| 19+45       0.3361      0.00  Q         |         |         |        V| 19+50       0.3361      0.00  Q         |         |         |        V| 19+55       0.3361      0.00  Q         |         |         |        V| 20+ 0       0.3361      0.00  Q         |         |         |        V| 20+ 5       0.3361      0.00  Q         |         |         |        V| 20+10       0.3361      0.00  Q         |         |         |        V| 20+15       0.3361      0.00  Q         |         |         |        V| 20+20       0.3361      0.00  Q         |         |         |        V| 20+25       0.3361      0.00  Q         |         |         |        V| 20+30       0.3361      0.00  Q         |         |         |        V| 20+35       0.3361      0.00  Q         |         |         |        V| 20+40       0.3361      0.00  Q         |         |         |        V| 20+45       0.3361      0.00  Q         |         |         |        V| 20+50       0.3361      0.00  Q         |         |         |        V| 20+55       0.3361      0.00  Q         |         |         |        V| 21+ 0       0.3361      0.00  Q         |         |         |        V| 21+ 5       0.3361      0.00  Q         |         |         |        V| 21+10       0.3361      0.00  Q         |         |         |        V| 21+15       0.3361      0.00  Q         |         |         |        V| 21+20       0.3361      0.00  Q         |         |         |        V| 21+25       0.3361      0.00  Q         |         |         |        V| 21+30       0.3361      0.00  Q         |         |         |        V| 21+35       0.3361      0.00  Q         |         |         |        V| 21+40       0.3361      0.00  Q         |         |         |        V| 21+45       0.3361      0.00  Q         |         |         |        V| 21+50       0.3361      0.00  Q         |         |         |        V| 21+55       0.3361      0.00  Q         |         |         |        V| 22+ 0       0.3361      0.00  Q         |         |         |        V| 22+ 5       0.3361      0.00  Q         |         |         |        V| 22+10       0.3361      0.00  Q         |         |         |        V| 22+15       0.3361      0.00  Q         |         |         |        V| 22+20       0.3361      0.00  Q         |         |         |        V| 22+25       0.3361      0.00  Q         |         |         |        V| 22+30       0.3361      0.00  Q         |         |         |        V| 22+35       0.3361      0.00  Q         |         |         |        V| 22+40       0.3361      0.00  Q         |         |         |        V| 22+45       0.3361      0.00  Q         |         |         |        V| 22+50       0.3361      0.00  Q         |         |         |        V| 22+55       0.3362      0.00  Q         |         |         |        V| 23+ 0       0.3362      0.00  Q         |         |         |        V| 23+ 5       0.3362      0.00  Q         |         |         |        V| 23+10       0.3362      0.00  Q         |         |         |        V| 23+15       0.3362      0.00  Q         |         |         |        V| 711
23+20       0.3362      0.00  Q         |         |         |        V| 23+25       0.3362      0.00  Q         |         |         |        V| 23+30       0.3362      0.00  Q         |         |         |        V| 23+35       0.3362      0.00  Q         |         |         |        V| 23+40       0.3362      0.00  Q         |         |         |        V| 23+45       0.3362      0.00  Q         |         |         |        V| 23+50       0.3362      0.00  Q         |         |         |        V| 23+55       0.3362      0.00  Q         |         |         |        V| 24+ 0       0.3362      0.00  Q         |         |         |        V| 24+ 5       0.3362      0.00  Q         |         |         |        V| 24+10       0.3362      0.00  Q         |         |         |        V| 24+15       0.3362      0.00  Q         |         |         |        V| 24+20       0.3362      0.00  Q         |         |         |        V| 24+25       0.3362      0.00  Q         |         |         |        V| ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐ 712
U n i t   H y d r o g r a p h    A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 ‐ 2004, Version 7.0 Study date  06/28/24
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ San Bernardino County Synthetic Unit Hydrology Method
Manual date ‐ August 1986
Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ JN 4113 UNIT HYDROGRAPH
100 YEAR 3 HOUR STORM  POST‐DEVELOPED
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Storm Event Year = 100
Antecedent Moisture Condition = 3
English (in‐lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
Area averaged rainfall intensity isohyetal data:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 100

3.98 24 0.29
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ********
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 3) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)

32.0      52.0          3.98      1.000     0.785    0.130    0.102 Area‐averaged adjusted loss rate Fm (In/Hr) =  0.102
********* Area‐Averaged low loss rate fraction, Yb ********** Area       Area          SCS CN    SCS CN      S     Pervious 713
(Ac.)      Fract         (AMC2)    (AMC3)           Yield Fr

0.52 0.130 32.0 52.0 7.41 0.000

3.46   0.870         98.0      98.0       0.20     0.852 Area‐averaged catchment yield fraction, Y =  0.741
Area‐averaged low loss fraction, Yb =  0.259
User entry of time of concentration  =   0.175 (hours)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Watershed area =       3.98(Ac.)
Catchment Lag time =   0.140 hours
Unit interval =   5.000 minutes
Unit interval percentage of lag time = 59.6329
Hydrograph baseflow =     0.00(CFS)
Average maximum watershed loss rate(Fm) =  0.102(In/Hr) Average low loss rate fraction (Yb) = 0.259 (decimal)
VALLEY DEVELOPED S‐Graph Selected
Computed peak 5‐minute rainfall =  0.548(In)
Computed peak 30‐minute rainfall =  1.122(In)
Specified peak 1‐hour rainfall =  1.480(In)
Computed peak 3‐hour rainfall =  1.480(In)
Specified peak 6‐hour rainfall =  1.481(In)
Specified peak 24‐hour rainfall =  1.482(In)
Note: user specified rainfall values used.

Rainfall depth area reduction factors:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 100

3.98 24 0.29
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ********
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 3) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)

32.0      52.0          3.98      1.000     0.785    0.130    0.102 Area‐averaged adjusted loss rate Fm (In/Hr) =  0.102
********* Area‐Averaged low loss rate fraction, Yb ********** Area       Area          SCS CN    SCS CN      S     Pervious 717
(Ac.)      Fract         (AMC2)    (AMC3)           Yield Fr

0.52 0.130 32.0 52.0 7.41 0.000

Rainfall depth area reduction factors:

Using a total area of       3.98(Ac.) (Ref: fig. E‐4)
5‐minute factor = 1.000     Adjusted rainfall =  0.548(In) 30‐minute factor = 1.000    Adjusted rainfall =  1.121(In) 1‐hour factor = 1.000       Adjusted rainfall =  1.480(In) 3‐hour factor = 1.000       Adjusted rainfall =  1.480(In) 6‐hour factor = 1.000       Adjusted rainfall =  1.481(In) 24‐hour factor = 1.000      Adjusted rainfall =  1.482(In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ U n i t  H y d r o g r a p h
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Interval          'S' Graph          Unit Hydrograph
Number            Mean values             ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ (K =        48.13 (CFS))
1                6.442                   3.101
2               41.188                  16.724
3               81.358                  19.335
4               95.384                   6.751
5               98.630                   1.562
6              100.000                   0.659
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Total soil rain loss =      0.10(In)
Total effective rainfall =      1.38(In)
718
Peak flow rate in flood hydrograph =     13.57(CFS)
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 ‐ H O U R    S T O R M
R u n o f f      H y d r o g r a p h
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Hydrograph in   5   Minute intervals ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Time(h+m) Volume Ac.Ft   Q(CFS)  0        5.0      10.0      15.0      20.0 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 0+ 5       0.0000      0.00  Q         |         |         |         | 0+10       0.0000      0.00  Q         |         |         |         | 0+15       0.0000      0.00  Q         |         |         |         | 0+20       0.0000      0.00  Q         |         |         |         | 0+25       0.0000      0.00  Q         |         |         |         | 0+30       0.0000      0.00  Q         |         |         |         | 0+35       0.0000      0.00  Q         |         |         |         | 0+40       0.0000      0.00  Q         |         |         |         | 0+45       0.0000      0.00  Q         |         |         |         | 0+50       0.0000      0.00  Q         |         |         |         | 0+55       0.0000      0.00  Q         |         |         |         | 1+ 0       0.0000      0.00  Q         |         |         |         | 1+ 5       0.0000      0.00  Q         |         |         |         | 1+10       0.0000      0.00  Q         |         |         |         | 1+15       0.0000      0.00  Q         |         |         |         | 1+20       0.0000      0.00  Q         |         |         |         | 1+25       0.0000      0.00  Q         |         |         |         | 1+30       0.0000      0.00  Q         |         |         |         | 1+35       0.0000      0.00  Q         |         |         |         | 1+40       0.0000      0.00  Q         |         |         |         | 1+45       0.0000      0.00  Q         |         |         |         | 1+50       0.0000      0.00  Q         |         |         |         | 1+55       0.0000      0.00  Q         |         |         |         | 2+ 0       0.0000      0.00  Q         |         |         |         | 2+ 5       0.0000      0.00  Q         |         |         |         | 2+10       0.0000      0.00  Q         |         |         |         | 2+15       0.0000      0.00  Q         |         |         |         | 2+20       0.0000      0.00  Q         |         |         |         | 2+25       0.0000      0.00  Q         |         |         |         | 2+30       0.0000      0.00  Q         |         |         |         | 2+35       0.0000      0.00  Q         |         |         |         | 2+40       0.0000      0.00  Q         |         |         |         | 2+45       0.0000      0.00  Q         |         |         |         | 2+50       0.0000      0.00  Q         |         |         |         | 2+55       0.0000      0.00  Q         |         |         |         | 3+ 0       0.0000      0.00  Q         |         |         |         | 3+ 5       0.0000      0.00  Q         |         |         |         | 3+10       0.0000      0.00  Q         |         |         |         | 3+15       0.0000      0.00  Q         |         |         |         | 3+20       0.0000      0.00  Q         |         |         |         | 719
3+25       0.0000      0.00  Q         |         |         |         | 3+30       0.0000      0.00  Q         |         |         |         | 3+35       0.0000      0.00  Q         |         |         |         | 3+40       0.0000      0.00  Q         |         |         |         | 3+45       0.0000      0.00  Q         |         |         |         | 3+50       0.0000      0.00  Q         |         |         |         | 3+55       0.0000      0.00  Q         |         |         |         | 4+ 0       0.0000      0.00  Q         |         |         |         | 4+ 5       0.0000      0.00  Q         |         |         |         | 4+10       0.0000      0.00  Q         |         |         |         | 4+15       0.0000      0.00  Q         |         |         |         | 4+20       0.0000      0.00  Q         |         |         |         | 4+25       0.0000      0.00  Q         |         |         |         | 4+30       0.0000      0.00  Q         |         |         |         | 4+35       0.0000      0.00  Q         |         |         |         | 4+40       0.0000      0.00  Q         |         |         |         | 4+45       0.0000      0.00  Q         |         |         |         | 4+50       0.0000      0.00  Q         |         |         |         | 4+55       0.0000      0.00  Q         |         |         |         | 5+ 0       0.0000      0.00  Q         |         |         |         | 5+ 5       0.0000      0.00  Q         |         |         |         | 5+10       0.0000      0.00  Q         |         |         |         | 5+15       0.0000      0.00  Q         |         |         |         | 5+20       0.0000      0.00  Q         |         |         |         | 5+25       0.0000      0.00  Q         |         |         |         | 5+30       0.0000      0.00  Q         |         |         |         | 5+35       0.0000      0.00  Q         |         |         |         | 5+40       0.0001      0.00  Q         |         |         |         | 5+45       0.0001      0.00  Q         |         |         |         | 5+50       0.0001      0.00  Q         |         |         |         | 5+55       0.0001      0.00  Q         |         |         |         | 6+ 0       0.0001      0.00  Q         |         |         |         | 6+ 5       0.0001      0.00  Q         |         |         |         | 6+10       0.0001      0.00  Q         |         |         |         | 6+15       0.0001      0.00  Q         |         |         |         | 6+20       0.0001      0.00  Q         |         |         |         | 6+25       0.0001      0.00  Q         |         |         |         | 6+30       0.0001      0.00  Q         |         |         |         | 6+35       0.0001      0.00  Q         |         |         |         | 6+40       0.0001      0.00  Q         |         |         |         | 6+45       0.0001      0.00  Q         |         |         |         | 6+50       0.0001      0.00  Q         |         |         |         | 6+55       0.0001      0.00  Q         |         |         |         | 7+ 0       0.0001      0.00  Q         |         |         |         | 7+ 5       0.0001      0.00  Q         |         |         |         | 7+10       0.0001      0.00  Q         |         |         |         | 7+15       0.0001      0.00  Q         |         |         |         | 7+20       0.0001      0.00  Q         |         |         |         | 7+25       0.0001      0.00  Q         |         |         |         | 7+30       0.0001      0.00  Q         |         |         |         | 720
7+35       0.0001      0.00  Q         |         |         |         | 7+40       0.0001      0.00  Q         |         |         |         | 7+45       0.0001      0.00  Q         |         |         |         | 7+50       0.0001      0.00  Q         |         |         |         | 7+55       0.0001      0.00  Q         |         |         |         | 8+ 0       0.0001      0.00  Q         |         |         |         | 8+ 5       0.0001      0.00  Q         |         |         |         | 8+10       0.0001      0.00  Q         |         |         |         | 8+15       0.0001      0.00  Q         |         |         |         | 8+20       0.0001      0.00  Q         |         |         |         | 8+25       0.0001      0.00  Q         |         |         |         | 8+30       0.0001      0.00  Q         |         |         |         | 8+35       0.0001      0.00  Q         |         |         |         | 8+40       0.0001      0.00  Q         |         |         |         | 8+45       0.0001      0.00  Q         |         |         |         | 8+50       0.0001      0.00  Q         |         |         |         | 8+55       0.0001      0.00  Q         |         |         |         | 9+ 0       0.0001      0.00  Q         |         |         |         | 9+ 5       0.0001      0.00  Q         |         |         |         | 9+10       0.0001      0.00  Q         |         |         |         | 9+15       0.0001      0.00  Q         |         |         |         | 9+20       0.0001      0.00  Q         |         |         |         | 9+25       0.0001      0.00  Q         |         |         |         | 9+30       0.0001      0.00  Q         |         |         |         | 9+35       0.0001      0.00  Q         |         |         |         | 9+40       0.0001      0.00  Q         |         |         |         | 9+45       0.0001      0.00  Q         |         |         |         | 9+50       0.0001      0.00  Q         |         |         |         | 9+55       0.0001      0.00  Q         |         |         |         | 10+ 0       0.0001      0.00  Q         |         |         |         | 10+ 5       0.0001      0.00  Q         |         |         |         | 10+10       0.0001      0.00  Q         |         |         |         | 10+15       0.0001      0.00  Q         |         |         |         | 10+20       0.0001      0.00  Q         |         |         |         | 10+25       0.0001      0.00  Q         |         |         |         | 10+30       0.0001      0.00  Q         |         |         |         | 10+35       0.0001      0.00  Q         |         |         |         | 10+40       0.0001      0.00  Q         |         |         |         | 10+45       0.0001      0.00  Q         |         |         |         | 10+50       0.0001      0.00  Q         |         |         |         | 10+55       0.0001      0.00  Q         |         |         |         | 11+ 0       0.0001      0.00  Q         |         |         |         | 11+ 5       0.0001      0.00  Q         |         |         |         | 11+10       0.0001      0.00  Q         |         |         |         | 11+15       0.0001      0.00  Q         |         |         |         | 11+20       0.0001      0.00  Q         |         |         |         | 11+25       0.0001      0.00  Q         |         |         |         | 11+30       0.0001      0.00  Q         |         |         |         | 11+35       0.0001      0.00  Q         |         |         |         | 11+40       0.0002      0.00  Q         |         |         |         | 721
11+45       0.0002      0.00  Q         |         |         |         | 11+50       0.0002      0.00  Q         |         |         |         | 11+55       0.0002      0.00  Q         |         |         |         | 12+ 0       0.0002      0.00  Q         |         |         |         | 12+ 5       0.0002      0.00  Q         |         |         |         | 12+10       0.0002      0.00  Q         |         |         |         | 12+15       0.0002      0.00  Q         |         |         |         | 12+20       0.0002      0.00  Q         |         |         |         | 12+25       0.0002      0.00  Q         |         |         |         | 12+30       0.0002      0.00  Q         |         |         |         | 12+35       0.0002      0.00  Q         |         |         |         | 12+40       0.0002      0.00  Q         |         |         |         | 12+45       0.0002      0.00  Q         |         |         |         | 12+50       0.0002      0.00  Q         |         |         |         | 12+55       0.0002      0.00  Q         |         |         |         | 13+ 0       0.0002      0.00  Q         |         |         |         | 13+ 5       0.0002      0.00  Q         |         |         |         | 13+10       0.0002      0.00  Q         |         |         |         | 13+15       0.0002      0.00  Q         |         |         |         | 13+20       0.0002      0.00  Q         |         |         |         | 13+25       0.0003      0.00  Q         |         |         |         | 13+30       0.0003      0.00  Q         |         |         |         | 13+35       0.0003      0.00  Q         |         |         |         | 13+40       0.0003      0.00  Q         |         |         |         | 13+45       0.0003      0.00  Q         |         |         |         | 13+50       0.0003      0.00  Q         |         |         |         | 13+55       0.0003      0.00  Q         |         |         |         | 14+ 0       0.0003      0.00  Q         |         |         |         | 14+ 5       0.0003      0.00  Q         |         |         |         | 14+10       0.0003      0.00  Q         |         |         |         | 14+15       0.0003      0.00  Q         |         |         |         | 14+20       0.0003      0.00  Q         |         |         |         | 14+25       0.0003      0.00  Q         |         |         |         | 14+30       0.0003      0.00  Q         |         |         |         | 14+35       0.0003      0.00  Q         |         |         |         | 14+40       0.0003      0.00  Q         |         |         |         | 14+45       0.0003      0.00  Q         |         |         |         | 14+50       0.0003      0.00  Q         |         |         |         | 14+55       0.0003      0.00  Q         |         |         |         | 15+ 0       0.0003      0.00  Q         |         |         |         | 15+ 5       0.0004      0.00  Q         |         |         |         | 15+10       0.0004      0.00  Q         |         |         |         | 15+15       0.0004      0.00  Q         |         |         |         | 15+20       0.0004      0.00  Q         |         |         |         | 15+25       0.0013      0.13  Q         |         |         |         | 15+30       0.0071      0.84  VQ        |         |         |         | 15+35       0.0190      1.73  |V Q      |         |         |         | 15+40       0.0341      2.20  | V Q     |         |         |         | 15+45       0.0517      2.55  |   VQ    |         |         |         | 15+50       0.0722      2.98  |    QV   |         |         |         | 722
15+55       0.0968      3.57  |      QV |         |         |         | 16+ 0       0.1289      4.66  |        Q|V        |         |         | 16+ 5       0.1801      7.44  |         |   QV    |         |         | 16+10       0.2731     13.50  |         |         |  V   Q  |         | 16+15       0.3666     13.57  |         |         |      Q  | V       | 16+20       0.4150      7.02  |         |   Q     |         |     V   | 16+25       0.4399      3.62  |      Q  |         |         |       V | 16+30       0.4527      1.86  |  Q      |         |         |        V| 16+35       0.4560      0.49  Q         |         |         |        V| 16+40       0.4568      0.12  Q         |         |         |        V| 16+45       0.4571      0.03  Q         |         |         |        V| 16+50       0.4571      0.00  Q         |         |         |        V| 16+55       0.4571      0.00  Q         |         |         |        V| 17+ 0       0.4571      0.00  Q         |         |         |        V| 17+ 5       0.4571      0.00  Q         |         |         |        V| 17+10       0.4571      0.00  Q         |         |         |        V| 17+15       0.4571      0.00  Q         |         |         |        V| 17+20       0.4571      0.00  Q         |         |         |        V| 17+25       0.4571      0.00  Q         |         |         |        V| 17+30       0.4571      0.00  Q         |         |         |        V| 17+35       0.4571      0.00  Q         |         |         |        V| 17+40       0.4571      0.00  Q         |         |         |        V| 17+45       0.4571      0.00  Q         |         |         |        V| 17+50       0.4571      0.00  Q         |         |         |        V| 17+55       0.4571      0.00  Q         |         |         |        V| 18+ 0       0.4572      0.00  Q         |         |         |        V| 18+ 5       0.4572      0.00  Q         |         |         |        V| 18+10       0.4572      0.00  Q         |         |         |        V| 18+15       0.4572      0.00  Q         |         |         |        V| 18+20       0.4572      0.00  Q         |         |         |        V| 18+25       0.4572      0.00  Q         |         |         |        V| 18+30       0.4572      0.00  Q         |         |         |        V| 18+35       0.4572      0.00  Q         |         |         |        V| 18+40       0.4572      0.00  Q         |         |         |        V| 18+45       0.4572      0.00  Q         |         |         |        V| 18+50       0.4572      0.00  Q         |         |         |        V| 18+55       0.4572      0.00  Q         |         |         |        V| 19+ 0       0.4572      0.00  Q         |         |         |        V| 19+ 5       0.4572      0.00  Q         |         |         |        V| 19+10       0.4572      0.00  Q         |         |         |        V| 19+15       0.4572      0.00  Q         |         |         |        V| 19+20       0.4572      0.00  Q         |         |         |        V| 19+25       0.4572      0.00  Q         |         |         |        V| 19+30       0.4572      0.00  Q         |         |         |        V| 19+35       0.4572      0.00  Q         |         |         |        V| 19+40       0.4572      0.00  Q         |         |         |        V| 19+45       0.4572      0.00  Q         |         |         |        V| 19+50       0.4572      0.00  Q         |         |         |        V| 19+55       0.4572      0.00  Q         |         |         |        V| 20+ 0       0.4572      0.00  Q         |         |         |        V| 723
20+ 5       0.4572      0.00  Q         |         |         |        V| 20+10       0.4572      0.00  Q         |         |         |        V| 20+15       0.4572      0.00  Q         |         |         |        V| 20+20       0.4572      0.00  Q         |         |         |        V| 20+25       0.4572      0.00  Q         |         |         |        V| 20+30       0.4572      0.00  Q         |         |         |        V| 20+35       0.4572      0.00  Q         |         |         |        V| 20+40       0.4572      0.00  Q         |         |         |        V| 20+45       0.4572      0.00  Q         |         |         |        V| 20+50       0.4572      0.00  Q         |         |         |        V| 20+55       0.4572      0.00  Q         |         |         |        V| 21+ 0       0.4572      0.00  Q         |         |         |        V| 21+ 5       0.4572      0.00  Q         |         |         |        V| 21+10       0.4572      0.00  Q         |         |         |        V| 21+15       0.4572      0.00  Q         |         |         |        V| 21+20       0.4572      0.00  Q         |         |         |        V| 21+25       0.4572      0.00  Q         |         |         |        V| 21+30       0.4572      0.00  Q         |         |         |        V| 21+35       0.4572      0.00  Q         |         |         |        V| 21+40       0.4572      0.00  Q         |         |         |        V| 21+45       0.4572      0.00  Q         |         |         |        V| 21+50       0.4572      0.00  Q         |         |         |        V| 21+55       0.4572      0.00  Q         |         |         |        V| 22+ 0       0.4572      0.00  Q         |         |         |        V| 22+ 5       0.4572      0.00  Q         |         |         |        V| 22+10       0.4572      0.00  Q         |         |         |        V| 22+15       0.4572      0.00  Q         |         |         |        V| 22+20       0.4572      0.00  Q         |         |         |        V| 22+25       0.4572      0.00  Q         |         |         |        V| 22+30       0.4572      0.00  Q         |         |         |        V| 22+35       0.4572      0.00  Q         |         |         |        V| 22+40       0.4572      0.00  Q         |         |         |        V| 22+45       0.4572      0.00  Q         |         |         |        V| 22+50       0.4572      0.00  Q         |         |         |        V| 22+55       0.4572      0.00  Q         |         |         |        V| 23+ 0       0.4572      0.00  Q         |         |         |        V| 23+ 5       0.4572      0.00  Q         |         |         |        V| 23+10       0.4572      0.00  Q         |         |         |        V| 23+15       0.4572      0.00  Q         |         |         |        V| 23+20       0.4572      0.00  Q         |         |         |        V| 23+25       0.4572      0.00  Q         |         |         |        V| 23+30       0.4572      0.00  Q         |         |         |        V| 23+35       0.4572      0.00  Q         |         |         |        V| 23+40       0.4572      0.00  Q         |         |         |        V| 23+45       0.4572      0.00  Q         |         |         |        V| 23+50       0.4572      0.00  Q         |         |         |        V| 23+55       0.4572      0.00  Q         |         |         |        V| 24+ 0       0.4572      0.00  Q         |         |         |        V| 24+ 5       0.4572      0.00  Q         |         |         |        V| 24+10       0.4572      0.00  Q         |         |         |        V| 724
24+15       0.4572      0.00  Q         |         |         |        V| 24+20       0.4572      0.00  Q         |         |         |        V| 24+25       0.4572      0.00  Q         |         |         |        V| ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐ 725
U n i t   H y d r o g r a p h    A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 ‐ 2004, Version 7.0 Study date  07/24/24
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ San Bernardino County Synthetic Unit Hydrology Method
Manual date ‐ August 1986
Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ JN 4113 UNIT HYDROGRAPH
2 YEAR 3 HOUR STORM‐ POST‐DEVELOPED
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Storm Event Year = 2
Antecedent Moisture Condition = 2
English (in‐lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
Area averaged rainfall intensity isohyetal data:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 10

3.98 24 0.29
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ********
726
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 2) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)

0.52 0.130 32.0 32.0 2.61 0.000

Rainfall depth area reduction factors:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 10

3.98 24 0.29
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 730
******** Area‐averaged max loss rate, Fm ********
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 2) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)

0.52 0.130 32.0 32.0 2.61 0.000

Rainfall depth area reduction factors:

Using a total area of       3.98(Ac.) (Ref: fig. E‐4)
5‐minute factor = 1.000     Adjusted rainfall =  0.192(In) 30‐minute factor = 1.000    Adjusted rainfall =  0.394(In) 1‐hour factor = 1.000       Adjusted rainfall =  0.520(In) 3‐hour factor = 1.000       Adjusted rainfall =  0.520(In) 6‐hour factor = 1.000       Adjusted rainfall =  0.521(In) 24‐hour factor = 1.000      Adjusted rainfall =  0.522(In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ U n i t  H y d r o g r a p h
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Interval          'S' Graph          Unit Hydrograph
Number            Mean values             ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ (K =        48.13 (CFS))
731
1                6.220                   2.994
2               39.874                  16.198
3               80.296                  19.457
4               94.943                   7.050
5               98.536                   1.729
6              100.000                   0.705
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Total soil rain loss =      0.12(In)
Total effective rainfall =      0.40(In)
Peak flow rate in flood hydrograph =      4.43(CFS)
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 ‐ H O U R    S T O R M
R u n o f f      H y d r o g r a p h
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Hydrograph in   5   Minute intervals ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Time(h+m) Volume Ac.Ft   Q(CFS)  0        2.5       5.0       7.5      10.0 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 0+ 5       0.0000      0.00  Q         |         |         |         | 0+10       0.0000      0.00  Q         |         |         |         | 0+15       0.0000      0.00  Q         |         |         |         | 0+20       0.0000      0.00  Q         |         |         |         | 0+25       0.0000      0.00  Q         |         |         |         | 0+30       0.0000      0.00  Q         |         |         |         | 0+35       0.0000      0.00  Q         |         |         |         | 0+40       0.0000      0.00  Q         |         |         |         | 0+45       0.0000      0.00  Q         |         |         |         | 0+50       0.0000      0.00  Q         |         |         |         | 0+55       0.0000      0.00  Q         |         |         |         | 1+ 0       0.0000      0.00  Q         |         |         |         | 1+ 5       0.0000      0.00  Q         |         |         |         | 1+10       0.0000      0.00  Q         |         |         |         | 1+15       0.0000      0.00  Q         |         |         |         | 1+20       0.0000      0.00  Q         |         |         |         | 1+25       0.0000      0.00  Q         |         |         |         | 1+30       0.0000      0.00  Q         |         |         |         | 1+35       0.0000      0.00  Q         |         |         |         | 1+40       0.0000      0.00  Q         |         |         |         | 1+45       0.0000      0.00  Q         |         |         |         | 1+50       0.0000      0.00  Q         |         |         |         | 1+55       0.0000      0.00  Q         |         |         |         | 2+ 0       0.0000      0.00  Q         |         |         |         | 2+ 5       0.0000      0.00  Q         |         |         |         | 2+10       0.0000      0.00  Q         |         |         |         | 2+15       0.0000      0.00  Q         |         |         |         | 2+20       0.0000      0.00  Q         |         |         |         | 2+25       0.0000      0.00  Q         |         |         |         | 732
2+30       0.0000      0.00  Q         |         |         |         | 2+35       0.0000      0.00  Q         |         |         |         | 2+40       0.0000      0.00  Q         |         |         |         | 2+45       0.0000      0.00  Q         |         |         |         | 2+50       0.0000      0.00  Q         |         |         |         | 2+55       0.0000      0.00  Q         |         |         |         | 3+ 0       0.0000      0.00  Q         |         |         |         | 3+ 5       0.0000      0.00  Q         |         |         |         | 3+10       0.0000      0.00  Q         |         |         |         | 3+15       0.0000      0.00  Q         |         |         |         | 3+20       0.0000      0.00  Q         |         |         |         | 3+25       0.0000      0.00  Q         |         |         |         | 3+30       0.0000      0.00  Q         |         |         |         | 3+35       0.0000      0.00  Q         |         |         |         | 3+40       0.0000      0.00  Q         |         |         |         | 3+45       0.0000      0.00  Q         |         |         |         | 3+50       0.0000      0.00  Q         |         |         |         | 3+55       0.0000      0.00  Q         |         |         |         | 4+ 0       0.0000      0.00  Q         |         |         |         | 4+ 5       0.0000      0.00  Q         |         |         |         | 4+10       0.0000      0.00  Q         |         |         |         | 4+15       0.0000      0.00  Q         |         |         |         | 4+20       0.0000      0.00  Q         |         |         |         | 4+25       0.0000      0.00  Q         |         |         |         | 4+30       0.0000      0.00  Q         |         |         |         | 4+35       0.0000      0.00  Q         |         |         |         | 4+40       0.0000      0.00  Q         |         |         |         | 4+45       0.0000      0.00  Q         |         |         |         | 4+50       0.0000      0.00  Q         |         |         |         | 4+55       0.0000      0.00  Q         |         |         |         | 5+ 0       0.0000      0.00  Q         |         |         |         | 5+ 5       0.0000      0.00  Q         |         |         |         | 5+10       0.0000      0.00  Q         |         |         |         | 5+15       0.0000      0.00  Q         |         |         |         | 5+20       0.0000      0.00  Q         |         |         |         | 5+25       0.0000      0.00  Q         |         |         |         | 5+30       0.0000      0.00  Q         |         |         |         | 5+35       0.0000      0.00  Q         |         |         |         | 5+40       0.0000      0.00  Q         |         |         |         | 5+45       0.0000      0.00  Q         |         |         |         | 5+50       0.0000      0.00  Q         |         |         |         | 5+55       0.0000      0.00  Q         |         |         |         | 6+ 0       0.0000      0.00  Q         |         |         |         | 6+ 5       0.0000      0.00  Q         |         |         |         | 6+10       0.0000      0.00  Q         |         |         |         | 6+15       0.0000      0.00  Q         |         |         |         | 6+20       0.0000      0.00  Q         |         |         |         | 6+25       0.0000      0.00  Q         |         |         |         | 6+30       0.0000      0.00  Q         |         |         |         | 6+35       0.0000      0.00  Q         |         |         |         | 733
6+40       0.0000      0.00  Q         |         |         |         | 6+45       0.0000      0.00  Q         |         |         |         | 6+50       0.0000      0.00  Q         |         |         |         | 6+55       0.0000      0.00  Q         |         |         |         | 7+ 0       0.0001      0.00  Q         |         |         |         | 7+ 5       0.0001      0.00  Q         |         |         |         | 7+10       0.0001      0.00  Q         |         |         |         | 7+15       0.0001      0.00  Q         |         |         |         | 7+20       0.0001      0.00  Q         |         |         |         | 7+25       0.0001      0.00  Q         |         |         |         | 7+30       0.0001      0.00  Q         |         |         |         | 7+35       0.0001      0.00  Q         |         |         |         | 7+40       0.0001      0.00  Q         |         |         |         | 7+45       0.0001      0.00  Q         |         |         |         | 7+50       0.0001      0.00  Q         |         |         |         | 7+55       0.0001      0.00  Q         |         |         |         | 8+ 0       0.0001      0.00  Q         |         |         |         | 8+ 5       0.0001      0.00  Q         |         |         |         | 8+10       0.0001      0.00  Q         |         |         |         | 8+15       0.0001      0.00  Q         |         |         |         | 8+20       0.0001      0.00  Q         |         |         |         | 8+25       0.0001      0.00  Q         |         |         |         | 8+30       0.0001      0.00  Q         |         |         |         | 8+35       0.0001      0.00  Q         |         |         |         | 8+40       0.0001      0.00  Q         |         |         |         | 8+45       0.0001      0.00  Q         |         |         |         | 8+50       0.0001      0.00  Q         |         |         |         | 8+55       0.0001      0.00  Q         |         |         |         | 9+ 0       0.0001      0.00  Q         |         |         |         | 9+ 5       0.0001      0.00  Q         |         |         |         | 9+10       0.0001      0.00  Q         |         |         |         | 9+15       0.0001      0.00  Q         |         |         |         | 9+20       0.0001      0.00  Q         |         |         |         | 9+25       0.0001      0.00  Q         |         |         |         | 9+30       0.0001      0.00  Q         |         |         |         | 9+35       0.0001      0.00  Q         |         |         |         | 9+40       0.0001      0.00  Q         |         |         |         | 9+45       0.0001      0.00  Q         |         |         |         | 9+50       0.0001      0.00  Q         |         |         |         | 9+55       0.0001      0.00  Q         |         |         |         | 10+ 0       0.0001      0.00  Q         |         |         |         | 10+ 5       0.0001      0.00  Q         |         |         |         | 10+10       0.0001      0.00  Q         |         |         |         | 10+15       0.0001      0.00  Q         |         |         |         | 10+20       0.0001      0.00  Q         |         |         |         | 10+25       0.0001      0.00  Q         |         |         |         | 10+30       0.0001      0.00  Q         |         |         |         | 10+35       0.0001      0.00  Q         |         |         |         | 10+40       0.0001      0.00  Q         |         |         |         | 10+45       0.0001      0.00  Q         |         |         |         | 734
10+50       0.0001      0.00  Q         |         |         |         | 10+55       0.0001      0.00  Q         |         |         |         | 11+ 0       0.0001      0.00  Q         |         |         |         | 11+ 5       0.0001      0.00  Q         |         |         |         | 11+10       0.0001      0.00  Q         |         |         |         | 11+15       0.0001      0.00  Q         |         |         |         | 11+20       0.0001      0.00  Q         |         |         |         | 11+25       0.0001      0.00  Q         |         |         |         | 11+30       0.0001      0.00  Q         |         |         |         | 11+35       0.0001      0.00  Q         |         |         |         | 11+40       0.0001      0.00  Q         |         |         |         | 11+45       0.0001      0.00  Q         |         |         |         | 11+50       0.0001      0.00  Q         |         |         |         | 11+55       0.0001      0.00  Q         |         |         |         | 12+ 0       0.0001      0.00  Q         |         |         |         | 12+ 5       0.0001      0.00  Q         |         |         |         | 12+10       0.0001      0.00  Q         |         |         |         | 12+15       0.0001      0.00  Q         |         |         |         | 12+20       0.0001      0.00  Q         |         |         |         | 12+25       0.0001      0.00  Q         |         |         |         | 12+30       0.0001      0.00  Q         |         |         |         | 12+35       0.0001      0.00  Q         |         |         |         | 12+40       0.0001      0.00  Q         |         |         |         | 12+45       0.0002      0.00  Q         |         |         |         | 12+50       0.0002      0.00  Q         |         |         |         | 12+55       0.0002      0.00  Q         |         |         |         | 13+ 0       0.0002      0.00  Q         |         |         |         | 13+ 5       0.0002      0.00  Q         |         |         |         | 13+10       0.0002      0.00  Q         |         |         |         | 13+15       0.0002      0.00  Q         |         |         |         | 13+20       0.0002      0.00  Q         |         |         |         | 13+25       0.0002      0.00  Q         |         |         |         | 13+30       0.0002      0.00  Q         |         |         |         | 13+35       0.0002      0.00  Q         |         |         |         | 13+40       0.0002      0.00  Q         |         |         |         | 13+45       0.0002      0.00  Q         |         |         |         | 13+50       0.0002      0.00  Q         |         |         |         | 13+55       0.0002      0.00  Q         |         |         |         | 14+ 0       0.0002      0.00  Q         |         |         |         | 14+ 5       0.0002      0.00  Q         |         |         |         | 14+10       0.0002      0.00  Q         |         |         |         | 14+15       0.0002      0.00  Q         |         |         |         | 14+20       0.0002      0.00  Q         |         |         |         | 14+25       0.0002      0.00  Q         |         |         |         | 14+30       0.0003      0.00  Q         |         |         |         | 14+35       0.0003      0.00  Q         |         |         |         | 14+40       0.0003      0.00  Q         |         |         |         | 14+45       0.0003      0.00  Q         |         |         |         | 14+50       0.0003      0.00  Q         |         |         |         | 14+55       0.0003      0.00  Q         |         |         |         | 735
15+ 0       0.0003      0.00  Q         |         |         |         | 15+ 5       0.0003      0.00  Q         |         |         |         | 15+10       0.0003      0.00  Q         |         |         |         | 15+15       0.0003      0.00  Q         |         |         |         | 15+20       0.0003      0.00  Q         |         |         |         | 15+25       0.0005      0.03  Q         |         |         |         | 15+30       0.0018      0.19  Q         |         |         |         | 15+35       0.0046      0.40  |Q        |         |         |         | 15+40       0.0081      0.51  | Q       |         |         |         | 15+45       0.0121      0.59  | QV      |         |         |         | 15+50       0.0170      0.70  | Q  V    |         |         |         | 15+55       0.0231      0.89  |  Q  V   |         |         |         | 16+ 0       0.0318      1.26  |    Q   V|         |         |         | 16+ 5       0.0470      2.22  |       Q |   V     |         |         | 16+10       0.0767      4.30  |         |      Q  | V       |         | 16+15       0.1072      4.43  |         |      Q  |         | V       | 16+20       0.1221      2.16  |       Q |         |         |     V   | 16+25       0.1289      1.00  |  Q      |         |         |       V | 16+30       0.1323      0.49  |Q        |         |         |        V| 16+35       0.1332      0.12  Q         |         |         |        V| 16+40       0.1334      0.03  Q         |         |         |        V| 16+45       0.1335      0.01  Q         |         |         |        V| 16+50       0.1335      0.00  Q         |         |         |        V| 16+55       0.1335      0.00  Q         |         |         |        V| 17+ 0       0.1335      0.00  Q         |         |         |        V| 17+ 5       0.1335      0.00  Q         |         |         |        V| 17+10       0.1335      0.00  Q         |         |         |        V| 17+15       0.1335      0.00  Q         |         |         |        V| 17+20       0.1335      0.00  Q         |         |         |        V| 17+25       0.1335      0.00  Q         |         |         |        V| 17+30       0.1335      0.00  Q         |         |         |        V| 17+35       0.1335      0.00  Q         |         |         |        V| 17+40       0.1335      0.00  Q         |         |         |        V| 17+45       0.1335      0.00  Q         |         |         |        V| 17+50       0.1335      0.00  Q         |         |         |        V| 17+55       0.1335      0.00  Q         |         |         |        V| 18+ 0       0.1335      0.00  Q         |         |         |        V| 18+ 5       0.1335      0.00  Q         |         |         |        V| 18+10       0.1335      0.00  Q         |         |         |        V| 18+15       0.1335      0.00  Q         |         |         |        V| 18+20       0.1335      0.00  Q         |         |         |        V| 18+25       0.1335      0.00  Q         |         |         |        V| 18+30       0.1335      0.00  Q         |         |         |        V| 18+35       0.1335      0.00  Q         |         |         |        V| 18+40       0.1335      0.00  Q         |         |         |        V| 18+45       0.1335      0.00  Q         |         |         |        V| 18+50       0.1335      0.00  Q         |         |         |        V| 18+55       0.1335      0.00  Q         |         |         |        V| 19+ 0       0.1335      0.00  Q         |         |         |        V| 19+ 5       0.1335      0.00  Q         |         |         |        V| 736
19+10       0.1335      0.00  Q         |         |         |        V| 19+15       0.1335      0.00  Q         |         |         |        V| 19+20       0.1335      0.00  Q         |         |         |        V| 19+25       0.1335      0.00  Q         |         |         |        V| 19+30       0.1335      0.00  Q         |         |         |        V| 19+35       0.1335      0.00  Q         |         |         |        V| 19+40       0.1335      0.00  Q         |         |         |        V| 19+45       0.1335      0.00  Q         |         |         |        V| 19+50       0.1335      0.00  Q         |         |         |        V| 19+55       0.1335      0.00  Q         |         |         |        V| 20+ 0       0.1335      0.00  Q         |         |         |        V| 20+ 5       0.1335      0.00  Q         |         |         |        V| 20+10       0.1335      0.00  Q         |         |         |        V| 20+15       0.1335      0.00  Q         |         |         |        V| 20+20       0.1336      0.00  Q         |         |         |        V| 20+25       0.1336      0.00  Q         |         |         |        V| 20+30       0.1336      0.00  Q         |         |         |        V| 20+35       0.1336      0.00  Q         |         |         |        V| 20+40       0.1336      0.00  Q         |         |         |        V| 20+45       0.1336      0.00  Q         |         |         |        V| 20+50       0.1336      0.00  Q         |         |         |        V| 20+55       0.1336      0.00  Q         |         |         |        V| 21+ 0       0.1336      0.00  Q         |         |         |        V| 21+ 5       0.1336      0.00  Q         |         |         |        V| 21+10       0.1336      0.00  Q         |         |         |        V| 21+15       0.1336      0.00  Q         |         |         |        V| 21+20       0.1336      0.00  Q         |         |         |        V| 21+25       0.1336      0.00  Q         |         |         |        V| 21+30       0.1336      0.00  Q         |         |         |        V| 21+35       0.1336      0.00  Q         |         |         |        V| 21+40       0.1336      0.00  Q         |         |         |        V| 21+45       0.1336      0.00  Q         |         |         |        V| 21+50       0.1336      0.00  Q         |         |         |        V| 21+55       0.1336      0.00  Q         |         |         |        V| 22+ 0       0.1336      0.00  Q         |         |         |        V| 22+ 5       0.1336      0.00  Q         |         |         |        V| 22+10       0.1336      0.00  Q         |         |         |        V| 22+15       0.1336      0.00  Q         |         |         |        V| 22+20       0.1336      0.00  Q         |         |         |        V| 22+25       0.1336      0.00  Q         |         |         |        V| 22+30       0.1336      0.00  Q         |         |         |        V| 22+35       0.1336      0.00  Q         |         |         |        V| 22+40       0.1336      0.00  Q         |         |         |        V| 22+45       0.1336      0.00  Q         |         |         |        V| 22+50       0.1336      0.00  Q         |         |         |        V| 22+55       0.1336      0.00  Q         |         |         |        V| 23+ 0       0.1336      0.00  Q         |         |         |        V| 23+ 5       0.1336      0.00  Q         |         |         |        V| 23+10       0.1336      0.00  Q         |         |         |        V| 23+15       0.1336      0.00  Q         |         |         |        V| 737
23+20       0.1336      0.00  Q         |         |         |        V| 23+25       0.1336      0.00  Q         |         |         |        V| 23+30       0.1336      0.00  Q         |         |         |        V| 23+35       0.1336      0.00  Q         |         |         |        V| 23+40       0.1336      0.00  Q         |         |         |        V| 23+45       0.1336      0.00  Q         |         |         |        V| 23+50       0.1336      0.00  Q         |         |         |        V| 23+55       0.1336      0.00  Q         |         |         |        V| 24+ 0       0.1336      0.00  Q         |         |         |        V| 24+ 5       0.1336      0.00  Q         |         |         |        V| 24+10       0.1336      0.00  Q         |         |         |        V| 24+15       0.1336      0.00  Q         |         |         |        V| 24+20       0.1336      0.00  Q         |         |         |        V| 24+25       0.1336      0.00  Q         |         |         |         V ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐ 738
U n i t   H y d r o g r a p h    A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 ‐ 2004, Version 7.0 Study date  06/28/24
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ San Bernardino County Synthetic Unit Hydrology Method
Manual date ‐ August 1986
Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ JN 4113 UNIT HYDROGRAPH
10 YEAR 3 HOUR STORM  POST‐DEVELOPED
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Storm Event Year = 10
Antecedent Moisture Condition = 2
English (in‐lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
Area averaged rainfall intensity isohyetal data:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 10

32.0      32.0          3.98      1.000     0.978    0.130    0.127 Area‐averaged adjusted loss rate Fm (In/Hr) =  0.127
********* Area‐Averaged low loss rate fraction, Yb ********** Area       Area          SCS CN    SCS CN      S     Pervious 739
(Ac.)      Fract         (AMC2)    (AMC2)           Yield Fr

0.52 0.130 32.0 32.0 4.59 0.000

Rainfall depth area reduction factors:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 10

32.0 32.0 3.98 1.000 0.978 0.130 0.127 Area‐averaged adjusted loss rate Fm (In/Hr) = 0.127
********* Area‐Averaged low loss rate fraction, Yb ********** 743
Area Area SCS CN SCS CN S Pervious (Ac.) Fract (AMC2) (AMC2) Yield Fr

0.52 0.130 32.0 32.0 4.59 0.000

Rainfall depth area reduction factors:

Using a total area of       3.98(Ac.) (Ref: fig. E‐4)
5‐minute factor = 1.000     Adjusted rainfall =  0.339(In) 30‐minute factor = 1.000    Adjusted rainfall =  0.693(In) 1‐hour factor = 1.000       Adjusted rainfall =  0.915(In) 3‐hour factor = 1.000       Adjusted rainfall =  0.915(In) 6‐hour factor = 1.000       Adjusted rainfall =  0.916(In) 24‐hour factor = 1.000      Adjusted rainfall =  0.917(In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ U n i t  H y d r o g r a p h
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Interval          'S' Graph          Unit Hydrograph
Number            Mean values             ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ (K =        48.13 (CFS))
1                6.354                   3.058
2               40.669                  16.517
3               80.945                  19.386
4               95.214                   6.868
5               98.595                   1.627
6              100.000                   0.676
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Total soil rain loss =      0.13(In)
744
Total effective rainfall =      0.79(In)
Peak flow rate in flood hydrograph =      8.16(CFS)
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 ‐ H O U R    S T O R M
R u n o f f      H y d r o g r a p h
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Hydrograph in   5   Minute intervals ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Time(h+m) Volume Ac.Ft   Q(CFS)  0        2.5       5.0       7.5      10.0 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 0+ 5       0.0000      0.00  Q         |         |         |         | 0+10       0.0000      0.00  Q         |         |         |         | 0+15       0.0000      0.00  Q         |         |         |         | 0+20       0.0000      0.00  Q         |         |         |         | 0+25       0.0000      0.00  Q         |         |         |         | 0+30       0.0000      0.00  Q         |         |         |         | 0+35       0.0000      0.00  Q         |         |         |         | 0+40       0.0000      0.00  Q         |         |         |         | 0+45       0.0000      0.00  Q         |         |         |         | 0+50       0.0000      0.00  Q         |         |         |         | 0+55       0.0000      0.00  Q         |         |         |         | 1+ 0       0.0000      0.00  Q         |         |         |         | 1+ 5       0.0000      0.00  Q         |         |         |         | 1+10       0.0000      0.00  Q         |         |         |         | 1+15       0.0000      0.00  Q         |         |         |         | 1+20       0.0000      0.00  Q         |         |         |         | 1+25       0.0000      0.00  Q         |         |         |         | 1+30       0.0000      0.00  Q         |         |         |         | 1+35       0.0000      0.00  Q         |         |         |         | 1+40       0.0000      0.00  Q         |         |         |         | 1+45       0.0000      0.00  Q         |         |         |         | 1+50       0.0000      0.00  Q         |         |         |         | 1+55       0.0000      0.00  Q         |         |         |         | 2+ 0       0.0000      0.00  Q         |         |         |         | 2+ 5       0.0000      0.00  Q         |         |         |         | 2+10       0.0000      0.00  Q         |         |         |         | 2+15       0.0000      0.00  Q         |         |         |         | 2+20       0.0000      0.00  Q         |         |         |         | 2+25       0.0000      0.00  Q         |         |         |         | 2+30       0.0000      0.00  Q         |         |         |         | 2+35       0.0000      0.00  Q         |         |         |         | 2+40       0.0000      0.00  Q         |         |         |         | 2+45       0.0000      0.00  Q         |         |         |         | 2+50       0.0000      0.00  Q         |         |         |         | 2+55       0.0000      0.00  Q         |         |         |         | 3+ 0       0.0000      0.00  Q         |         |         |         | 3+ 5       0.0000      0.00  Q         |         |         |         | 3+10       0.0000      0.00  Q         |         |         |         | 3+15       0.0000      0.00  Q         |         |         |         | 745
3+20       0.0000      0.00  Q         |         |         |         | 3+25       0.0000      0.00  Q         |         |         |         | 3+30       0.0000      0.00  Q         |         |         |         | 3+35       0.0000      0.00  Q         |         |         |         | 3+40       0.0000      0.00  Q         |         |         |         | 3+45       0.0000      0.00  Q         |         |         |         | 3+50       0.0000      0.00  Q         |         |         |         | 3+55       0.0000      0.00  Q         |         |         |         | 4+ 0       0.0000      0.00  Q         |         |         |         | 4+ 5       0.0000      0.00  Q         |         |         |         | 4+10       0.0000      0.00  Q         |         |         |         | 4+15       0.0000      0.00  Q         |         |         |         | 4+20       0.0000      0.00  Q         |         |         |         | 4+25       0.0000      0.00  Q         |         |         |         | 4+30       0.0000      0.00  Q         |         |         |         | 4+35       0.0000      0.00  Q         |         |         |         | 4+40       0.0000      0.00  Q         |         |         |         | 4+45       0.0000      0.00  Q         |         |         |         | 4+50       0.0000      0.00  Q         |         |         |         | 4+55       0.0000      0.00  Q         |         |         |         | 5+ 0       0.0000      0.00  Q         |         |         |         | 5+ 5       0.0000      0.00  Q         |         |         |         | 5+10       0.0000      0.00  Q         |         |         |         | 5+15       0.0000      0.00  Q         |         |         |         | 5+20       0.0000      0.00  Q         |         |         |         | 5+25       0.0000      0.00  Q         |         |         |         | 5+30       0.0000      0.00  Q         |         |         |         | 5+35       0.0000      0.00  Q         |         |         |         | 5+40       0.0000      0.00  Q         |         |         |         | 5+45       0.0000      0.00  Q         |         |         |         | 5+50       0.0000      0.00  Q         |         |         |         | 5+55       0.0000      0.00  Q         |         |         |         | 6+ 0       0.0000      0.00  Q         |         |         |         | 6+ 5       0.0001      0.00  Q         |         |         |         | 6+10       0.0001      0.00  Q         |         |         |         | 6+15       0.0001      0.00  Q         |         |         |         | 6+20       0.0001      0.00  Q         |         |         |         | 6+25       0.0001      0.00  Q         |         |         |         | 6+30       0.0001      0.00  Q         |         |         |         | 6+35       0.0001      0.00  Q         |         |         |         | 6+40       0.0001      0.00  Q         |         |         |         | 6+45       0.0001      0.00  Q         |         |         |         | 6+50       0.0001      0.00  Q         |         |         |         | 6+55       0.0001      0.00  Q         |         |         |         | 7+ 0       0.0001      0.00  Q         |         |         |         | 7+ 5       0.0001      0.00  Q         |         |         |         | 7+10       0.0001      0.00  Q         |         |         |         | 7+15       0.0001      0.00  Q         |         |         |         | 7+20       0.0001      0.00  Q         |         |         |         | 7+25       0.0001      0.00  Q         |         |         |         | 746
7+30       0.0001      0.00  Q         |         |         |         | 7+35       0.0001      0.00  Q         |         |         |         | 7+40       0.0001      0.00  Q         |         |         |         | 7+45       0.0001      0.00  Q         |         |         |         | 7+50       0.0001      0.00  Q         |         |         |         | 7+55       0.0001      0.00  Q         |         |         |         | 8+ 0       0.0001      0.00  Q         |         |         |         | 8+ 5       0.0001      0.00  Q         |         |         |         | 8+10       0.0001      0.00  Q         |         |         |         | 8+15       0.0001      0.00  Q         |         |         |         | 8+20       0.0001      0.00  Q         |         |         |         | 8+25       0.0001      0.00  Q         |         |         |         | 8+30       0.0001      0.00  Q         |         |         |         | 8+35       0.0001      0.00  Q         |         |         |         | 8+40       0.0001      0.00  Q         |         |         |         | 8+45       0.0001      0.00  Q         |         |         |         | 8+50       0.0001      0.00  Q         |         |         |         | 8+55       0.0001      0.00  Q         |         |         |         | 9+ 0       0.0001      0.00  Q         |         |         |         | 9+ 5       0.0001      0.00  Q         |         |         |         | 9+10       0.0001      0.00  Q         |         |         |         | 9+15       0.0001      0.00  Q         |         |         |         | 9+20       0.0001      0.00  Q         |         |         |         | 9+25       0.0001      0.00  Q         |         |         |         | 9+30       0.0001      0.00  Q         |         |         |         | 9+35       0.0001      0.00  Q         |         |         |         | 9+40       0.0001      0.00  Q         |         |         |         | 9+45       0.0001      0.00  Q         |         |         |         | 9+50       0.0001      0.00  Q         |         |         |         | 9+55       0.0001      0.00  Q         |         |         |         | 10+ 0       0.0001      0.00  Q         |         |         |         | 10+ 5       0.0001      0.00  Q         |         |         |         | 10+10       0.0001      0.00  Q         |         |         |         | 10+15       0.0001      0.00  Q         |         |         |         | 10+20       0.0001      0.00  Q         |         |         |         | 10+25       0.0001      0.00  Q         |         |         |         | 10+30       0.0001      0.00  Q         |         |         |         | 10+35       0.0001      0.00  Q         |         |         |         | 10+40       0.0001      0.00  Q         |         |         |         | 10+45       0.0001      0.00  Q         |         |         |         | 10+50       0.0001      0.00  Q         |         |         |         | 10+55       0.0001      0.00  Q         |         |         |         | 11+ 0       0.0001      0.00  Q         |         |         |         | 11+ 5       0.0001      0.00  Q         |         |         |         | 11+10       0.0001      0.00  Q         |         |         |         | 11+15       0.0001      0.00  Q         |         |         |         | 11+20       0.0001      0.00  Q         |         |         |         | 11+25       0.0001      0.00  Q         |         |         |         | 11+30       0.0001      0.00  Q         |         |         |         | 11+35       0.0001      0.00  Q         |         |         |         | 747
11+40       0.0001      0.00  Q         |         |         |         | 11+45       0.0001      0.00  Q         |         |         |         | 11+50       0.0001      0.00  Q         |         |         |         | 11+55       0.0001      0.00  Q         |         |         |         | 12+ 0       0.0001      0.00  Q         |         |         |         | 12+ 5       0.0001      0.00  Q         |         |         |         | 12+10       0.0002      0.00  Q         |         |         |         | 12+15       0.0002      0.00  Q         |         |         |         | 12+20       0.0002      0.00  Q         |         |         |         | 12+25       0.0002      0.00  Q         |         |         |         | 12+30       0.0002      0.00  Q         |         |         |         | 12+35       0.0002      0.00  Q         |         |         |         | 12+40       0.0002      0.00  Q         |         |         |         | 12+45       0.0002      0.00  Q         |         |         |         | 12+50       0.0002      0.00  Q         |         |         |         | 12+55       0.0002      0.00  Q         |         |         |         | 13+ 0       0.0002      0.00  Q         |         |         |         | 13+ 5       0.0002      0.00  Q         |         |         |         | 13+10       0.0002      0.00  Q         |         |         |         | 13+15       0.0002      0.00  Q         |         |         |         | 13+20       0.0002      0.00  Q         |         |         |         | 13+25       0.0002      0.00  Q         |         |         |         | 13+30       0.0002      0.00  Q         |         |         |         | 13+35       0.0002      0.00  Q         |         |         |         | 13+40       0.0003      0.00  Q         |         |         |         | 13+45       0.0003      0.00  Q         |         |         |         | 13+50       0.0003      0.00  Q         |         |         |         | 13+55       0.0003      0.00  Q         |         |         |         | 14+ 0       0.0003      0.00  Q         |         |         |         | 14+ 5       0.0003      0.00  Q         |         |         |         | 14+10       0.0003      0.00  Q         |         |         |         | 14+15       0.0003      0.00  Q         |         |         |         | 14+20       0.0003      0.00  Q         |         |         |         | 14+25       0.0003      0.00  Q         |         |         |         | 14+30       0.0003      0.00  Q         |         |         |         | 14+35       0.0003      0.00  Q         |         |         |         | 14+40       0.0003      0.00  Q         |         |         |         | 14+45       0.0003      0.00  Q         |         |         |         | 14+50       0.0003      0.00  Q         |         |         |         | 14+55       0.0003      0.00  Q         |         |         |         | 15+ 0       0.0003      0.00  Q         |         |         |         | 15+ 5       0.0003      0.00  Q         |         |         |         | 15+10       0.0003      0.00  Q         |         |         |         | 15+15       0.0003      0.00  Q         |         |         |         | 15+20       0.0003      0.00  Q         |         |         |         | 15+25       0.0008      0.06  Q         |         |         |         | 15+30       0.0036      0.42  VQ        |         |         |         | 15+35       0.0096      0.86  |V Q      |         |         |         | 15+40       0.0173      1.12  | V Q     |         |         |         | 15+45       0.0264      1.32  |   VQ    |         |         |         | 748
15+50       0.0372      1.58  |    VQ   |         |         |         | 15+55       0.0507      1.95  |      Q  |         |         |         | 16+ 0       0.0687      2.61  |         Q         |         |         | 16+ 5       0.0984      4.32  |         |    V Q  |         |         | 16+10       0.1538      8.04  |         |         |  V      | Q       | 16+15       0.2099      8.16  |         |         |         | Q       | 16+20       0.2383      4.12  |         |     Q   |         |     V   | 16+25       0.2523      2.02  |       Q |         |         |       V | 16+30       0.2592      1.01  |   Q     |         |         |        V| 16+35       0.2610      0.26  |Q        |         |         |        V| 16+40       0.2615      0.06  Q         |         |         |        V| 16+45       0.2616      0.02  Q         |         |         |        V| 16+50       0.2616      0.00  Q         |         |         |        V| 16+55       0.2616      0.00  Q         |         |         |        V| 17+ 0       0.2616      0.00  Q         |         |         |        V| 17+ 5       0.2616      0.00  Q         |         |         |        V| 17+10       0.2616      0.00  Q         |         |         |        V| 17+15       0.2616      0.00  Q         |         |         |        V| 17+20       0.2616      0.00  Q         |         |         |        V| 17+25       0.2616      0.00  Q         |         |         |        V| 17+30       0.2616      0.00  Q         |         |         |        V| 17+35       0.2616      0.00  Q         |         |         |        V| 17+40       0.2616      0.00  Q         |         |         |        V| 17+45       0.2616      0.00  Q         |         |         |        V| 17+50       0.2616      0.00  Q         |         |         |        V| 17+55       0.2617      0.00  Q         |         |         |        V| 18+ 0       0.2617      0.00  Q         |         |         |        V| 18+ 5       0.2617      0.00  Q         |         |         |        V| 18+10       0.2617      0.00  Q         |         |         |        V| 18+15       0.2617      0.00  Q         |         |         |        V| 18+20       0.2617      0.00  Q         |         |         |        V| 18+25       0.2617      0.00  Q         |         |         |        V| 18+30       0.2617      0.00  Q         |         |         |        V| 18+35       0.2617      0.00  Q         |         |         |        V| 18+40       0.2617      0.00  Q         |         |         |        V| 18+45       0.2617      0.00  Q         |         |         |        V| 18+50       0.2617      0.00  Q         |         |         |        V| 18+55       0.2617      0.00  Q         |         |         |        V| 19+ 0       0.2617      0.00  Q         |         |         |        V| 19+ 5       0.2617      0.00  Q         |         |         |        V| 19+10       0.2617      0.00  Q         |         |         |        V| 19+15       0.2617      0.00  Q         |         |         |        V| 19+20       0.2617      0.00  Q         |         |         |        V| 19+25       0.2617      0.00  Q         |         |         |        V| 19+30       0.2617      0.00  Q         |         |         |        V| 19+35       0.2617      0.00  Q         |         |         |        V| 19+40       0.2617      0.00  Q         |         |         |        V| 19+45       0.2617      0.00  Q         |         |         |        V| 19+50       0.2617      0.00  Q         |         |         |        V| 19+55       0.2617      0.00  Q         |         |         |        V| 749
20+ 0       0.2617      0.00  Q         |         |         |        V| 20+ 5       0.2617      0.00  Q         |         |         |        V| 20+10       0.2617      0.00  Q         |         |         |        V| 20+15       0.2617      0.00  Q         |         |         |        V| 20+20       0.2617      0.00  Q         |         |         |        V| 20+25       0.2617      0.00  Q         |         |         |        V| 20+30       0.2617      0.00  Q         |         |         |        V| 20+35       0.2617      0.00  Q         |         |         |        V| 20+40       0.2617      0.00  Q         |         |         |        V| 20+45       0.2617      0.00  Q         |         |         |        V| 20+50       0.2617      0.00  Q         |         |         |        V| 20+55       0.2617      0.00  Q         |         |         |        V| 21+ 0       0.2617      0.00  Q         |         |         |        V| 21+ 5       0.2617      0.00  Q         |         |         |        V| 21+10       0.2617      0.00  Q         |         |         |        V| 21+15       0.2617      0.00  Q         |         |         |        V| 21+20       0.2617      0.00  Q         |         |         |        V| 21+25       0.2617      0.00  Q         |         |         |        V| 21+30       0.2617      0.00  Q         |         |         |        V| 21+35       0.2617      0.00  Q         |         |         |        V| 21+40       0.2617      0.00  Q         |         |         |        V| 21+45       0.2617      0.00  Q         |         |         |        V| 21+50       0.2617      0.00  Q         |         |         |        V| 21+55       0.2617      0.00  Q         |         |         |        V| 22+ 0       0.2617      0.00  Q         |         |         |        V| 22+ 5       0.2617      0.00  Q         |         |         |        V| 22+10       0.2617      0.00  Q         |         |         |        V| 22+15       0.2617      0.00  Q         |         |         |        V| 22+20       0.2617      0.00  Q         |         |         |        V| 22+25       0.2617      0.00  Q         |         |         |        V| 22+30       0.2617      0.00  Q         |         |         |        V| 22+35       0.2617      0.00  Q         |         |         |        V| 22+40       0.2617      0.00  Q         |         |         |        V| 22+45       0.2617      0.00  Q         |         |         |        V| 22+50       0.2617      0.00  Q         |         |         |        V| 22+55       0.2617      0.00  Q         |         |         |        V| 23+ 0       0.2617      0.00  Q         |         |         |        V| 23+ 5       0.2617      0.00  Q         |         |         |        V| 23+10       0.2617      0.00  Q         |         |         |        V| 23+15       0.2617      0.00  Q         |         |         |        V| 23+20       0.2617      0.00  Q         |         |         |        V| 23+25       0.2617      0.00  Q         |         |         |        V| 23+30       0.2617      0.00  Q         |         |         |        V| 23+35       0.2617      0.00  Q         |         |         |        V| 23+40       0.2617      0.00  Q         |         |         |        V| 23+45       0.2617      0.00  Q         |         |         |        V| 23+50       0.2617      0.00  Q         |         |         |        V| 23+55       0.2617      0.00  Q         |         |         |        V| 24+ 0       0.2617      0.00  Q         |         |         |        V| 24+ 5       0.2617      0.00  Q         |         |         |        V| 750
24+10       0.2617      0.00  Q         |         |         |        V| 24+15       0.2617      0.00  Q         |         |         |        V| 24+20       0.2617      0.00  Q         |         |         |        V| 24+25       0.2617      0.00  Q         |         |         |        V| ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐ 751
U n i t   H y d r o g r a p h    A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 ‐ 2004, Version 7.0 Study date  07/24/24
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ San Bernardino County Synthetic Unit Hydrology Method
Manual date ‐ August 1986
Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ JN 4113 UNIT HYDROGRAPH
25 YEAR 3 HOUR STORM  POST‐DEVELOPED
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Storm Event Year = 25
Antecedent Moisture Condition = 2
English (in‐lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
Area averaged rainfall intensity isohyetal data:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 10

3.98 24 0.29
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ********
752
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 2) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)

0.52 0.130 32.0 32.0 5.71 0.000

Rainfall depth area reduction factors:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 10

3.98 24 0.29
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 756
******** Area‐averaged max loss rate, Fm ********
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 2) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)

0.52 0.130 32.0 32.0 5.71 0.000

Rainfall depth area reduction factors:

Using a total area of       3.98(Ac.) (Ref: fig. E‐4)
5‐minute factor = 1.000     Adjusted rainfall =  0.422(In) 30‐minute factor = 1.000    Adjusted rainfall =  0.864(In) 1‐hour factor = 1.000       Adjusted rainfall =  1.140(In) 3‐hour factor = 1.000       Adjusted rainfall =  1.140(In) 6‐hour factor = 1.000       Adjusted rainfall =  1.141(In) 24‐hour factor = 1.000      Adjusted rainfall =  1.142(In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ U n i t  H y d r o g r a p h
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Interval          'S' Graph          Unit Hydrograph
Number            Mean values             ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ (K =        48.13 (CFS))
757
1                6.397                   3.079
2               40.927                  16.620
3               81.152                  19.361
4               95.299                   6.810
5               98.613                   1.595
6              100.000                   0.668
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Total soil rain loss =      0.13(In)
Total effective rainfall =      1.01(In)
Peak flow rate in flood hydrograph =     10.27(CFS)
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 ‐ H O U R    S T O R M
R u n o f f      H y d r o g r a p h
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Hydrograph in   5   Minute intervals ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Time(h+m) Volume Ac.Ft   Q(CFS)  0        5.0      10.0      15.0      20.0 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 0+ 5       0.0000      0.00  Q         |         |         |         | 0+10       0.0000      0.00  Q         |         |         |         | 0+15       0.0000      0.00  Q         |         |         |         | 0+20       0.0000      0.00  Q         |         |         |         | 0+25       0.0000      0.00  Q         |         |         |         | 0+30       0.0000      0.00  Q         |         |         |         | 0+35       0.0000      0.00  Q         |         |         |         | 0+40       0.0000      0.00  Q         |         |         |         | 0+45       0.0000      0.00  Q         |         |         |         | 0+50       0.0000      0.00  Q         |         |         |         | 0+55       0.0000      0.00  Q         |         |         |         | 1+ 0       0.0000      0.00  Q         |         |         |         | 1+ 5       0.0000      0.00  Q         |         |         |         | 1+10       0.0000      0.00  Q         |         |         |         | 1+15       0.0000      0.00  Q         |         |         |         | 1+20       0.0000      0.00  Q         |         |         |         | 1+25       0.0000      0.00  Q         |         |         |         | 1+30       0.0000      0.00  Q         |         |         |         | 1+35       0.0000      0.00  Q         |         |         |         | 1+40       0.0000      0.00  Q         |         |         |         | 1+45       0.0000      0.00  Q         |         |         |         | 1+50       0.0000      0.00  Q         |         |         |         | 1+55       0.0000      0.00  Q         |         |         |         | 2+ 0       0.0000      0.00  Q         |         |         |         | 2+ 5       0.0000      0.00  Q         |         |         |         | 2+10       0.0000      0.00  Q         |         |         |         | 2+15       0.0000      0.00  Q         |         |         |         | 2+20       0.0000      0.00  Q         |         |         |         | 2+25       0.0000      0.00  Q         |         |         |         | 758
2+30       0.0000      0.00  Q         |         |         |         | 2+35       0.0000      0.00  Q         |         |         |         | 2+40       0.0000      0.00  Q         |         |         |         | 2+45       0.0000      0.00  Q         |         |         |         | 2+50       0.0000      0.00  Q         |         |         |         | 2+55       0.0000      0.00  Q         |         |         |         | 3+ 0       0.0000      0.00  Q         |         |         |         | 3+ 5       0.0000      0.00  Q         |         |         |         | 3+10       0.0000      0.00  Q         |         |         |         | 3+15       0.0000      0.00  Q         |         |         |         | 3+20       0.0000      0.00  Q         |         |         |         | 3+25       0.0000      0.00  Q         |         |         |         | 3+30       0.0000      0.00  Q         |         |         |         | 3+35       0.0000      0.00  Q         |         |         |         | 3+40       0.0000      0.00  Q         |         |         |         | 3+45       0.0000      0.00  Q         |         |         |         | 3+50       0.0000      0.00  Q         |         |         |         | 3+55       0.0000      0.00  Q         |         |         |         | 4+ 0       0.0000      0.00  Q         |         |         |         | 4+ 5       0.0000      0.00  Q         |         |         |         | 4+10       0.0000      0.00  Q         |         |         |         | 4+15       0.0000      0.00  Q         |         |         |         | 4+20       0.0000      0.00  Q         |         |         |         | 4+25       0.0000      0.00  Q         |         |         |         | 4+30       0.0000      0.00  Q         |         |         |         | 4+35       0.0000      0.00  Q         |         |         |         | 4+40       0.0000      0.00  Q         |         |         |         | 4+45       0.0000      0.00  Q         |         |         |         | 4+50       0.0000      0.00  Q         |         |         |         | 4+55       0.0000      0.00  Q         |         |         |         | 5+ 0       0.0000      0.00  Q         |         |         |         | 5+ 5       0.0000      0.00  Q         |         |         |         | 5+10       0.0000      0.00  Q         |         |         |         | 5+15       0.0000      0.00  Q         |         |         |         | 5+20       0.0000      0.00  Q         |         |         |         | 5+25       0.0000      0.00  Q         |         |         |         | 5+30       0.0000      0.00  Q         |         |         |         | 5+35       0.0000      0.00  Q         |         |         |         | 5+40       0.0000      0.00  Q         |         |         |         | 5+45       0.0000      0.00  Q         |         |         |         | 5+50       0.0000      0.00  Q         |         |         |         | 5+55       0.0001      0.00  Q         |         |         |         | 6+ 0       0.0001      0.00  Q         |         |         |         | 6+ 5       0.0001      0.00  Q         |         |         |         | 6+10       0.0001      0.00  Q         |         |         |         | 6+15       0.0001      0.00  Q         |         |         |         | 6+20       0.0001      0.00  Q         |         |         |         | 6+25       0.0001      0.00  Q         |         |         |         | 6+30       0.0001      0.00  Q         |         |         |         | 6+35       0.0001      0.00  Q         |         |         |         | 759
6+40       0.0001      0.00  Q         |         |         |         | 6+45       0.0001      0.00  Q         |         |         |         | 6+50       0.0001      0.00  Q         |         |         |         | 6+55       0.0001      0.00  Q         |         |         |         | 7+ 0       0.0001      0.00  Q         |         |         |         | 7+ 5       0.0001      0.00  Q         |         |         |         | 7+10       0.0001      0.00  Q         |         |         |         | 7+15       0.0001      0.00  Q         |         |         |         | 7+20       0.0001      0.00  Q         |         |         |         | 7+25       0.0001      0.00  Q         |         |         |         | 7+30       0.0001      0.00  Q         |         |         |         | 7+35       0.0001      0.00  Q         |         |         |         | 7+40       0.0001      0.00  Q         |         |         |         | 7+45       0.0001      0.00  Q         |         |         |         | 7+50       0.0001      0.00  Q         |         |         |         | 7+55       0.0001      0.00  Q         |         |         |         | 8+ 0       0.0001      0.00  Q         |         |         |         | 8+ 5       0.0001      0.00  Q         |         |         |         | 8+10       0.0001      0.00  Q         |         |         |         | 8+15       0.0001      0.00  Q         |         |         |         | 8+20       0.0001      0.00  Q         |         |         |         | 8+25       0.0001      0.00  Q         |         |         |         | 8+30       0.0001      0.00  Q         |         |         |         | 8+35       0.0001      0.00  Q         |         |         |         | 8+40       0.0001      0.00  Q         |         |         |         | 8+45       0.0001      0.00  Q         |         |         |         | 8+50       0.0001      0.00  Q         |         |         |         | 8+55       0.0001      0.00  Q         |         |         |         | 9+ 0       0.0001      0.00  Q         |         |         |         | 9+ 5       0.0001      0.00  Q         |         |         |         | 9+10       0.0001      0.00  Q         |         |         |         | 9+15       0.0001      0.00  Q         |         |         |         | 9+20       0.0001      0.00  Q         |         |         |         | 9+25       0.0001      0.00  Q         |         |         |         | 9+30       0.0001      0.00  Q         |         |         |         | 9+35       0.0001      0.00  Q         |         |         |         | 9+40       0.0001      0.00  Q         |         |         |         | 9+45       0.0001      0.00  Q         |         |         |         | 9+50       0.0001      0.00  Q         |         |         |         | 9+55       0.0001      0.00  Q         |         |         |         | 10+ 0       0.0001      0.00  Q         |         |         |         | 10+ 5       0.0001      0.00  Q         |         |         |         | 10+10       0.0001      0.00  Q         |         |         |         | 10+15       0.0001      0.00  Q         |         |         |         | 10+20       0.0001      0.00  Q         |         |         |         | 10+25       0.0001      0.00  Q         |         |         |         | 10+30       0.0001      0.00  Q         |         |         |         | 10+35       0.0001      0.00  Q         |         |         |         | 10+40       0.0001      0.00  Q         |         |         |         | 10+45       0.0001      0.00  Q         |         |         |         | 760
10+50       0.0001      0.00  Q         |         |         |         | 10+55       0.0001      0.00  Q         |         |         |         | 11+ 0       0.0001      0.00  Q         |         |         |         | 11+ 5       0.0001      0.00  Q         |         |         |         | 11+10       0.0001      0.00  Q         |         |         |         | 11+15       0.0001      0.00  Q         |         |         |         | 11+20       0.0001      0.00  Q         |         |         |         | 11+25       0.0001      0.00  Q         |         |         |         | 11+30       0.0001      0.00  Q         |         |         |         | 11+35       0.0001      0.00  Q         |         |         |         | 11+40       0.0001      0.00  Q         |         |         |         | 11+45       0.0001      0.00  Q         |         |         |         | 11+50       0.0001      0.00  Q         |         |         |         | 11+55       0.0002      0.00  Q         |         |         |         | 12+ 0       0.0002      0.00  Q         |         |         |         | 12+ 5       0.0002      0.00  Q         |         |         |         | 12+10       0.0002      0.00  Q         |         |         |         | 12+15       0.0002      0.00  Q         |         |         |         | 12+20       0.0002      0.00  Q         |         |         |         | 12+25       0.0002      0.00  Q         |         |         |         | 12+30       0.0002      0.00  Q         |         |         |         | 12+35       0.0002      0.00  Q         |         |         |         | 12+40       0.0002      0.00  Q         |         |         |         | 12+45       0.0002      0.00  Q         |         |         |         | 12+50       0.0002      0.00  Q         |         |         |         | 12+55       0.0002      0.00  Q         |         |         |         | 13+ 0       0.0002      0.00  Q         |         |         |         | 13+ 5       0.0002      0.00  Q         |         |         |         | 13+10       0.0002      0.00  Q         |         |         |         | 13+15       0.0002      0.00  Q         |         |         |         | 13+20       0.0002      0.00  Q         |         |         |         | 13+25       0.0002      0.00  Q         |         |         |         | 13+30       0.0003      0.00  Q         |         |         |         | 13+35       0.0003      0.00  Q         |         |         |         | 13+40       0.0003      0.00  Q         |         |         |         | 13+45       0.0003      0.00  Q         |         |         |         | 13+50       0.0003      0.00  Q         |         |         |         | 13+55       0.0003      0.00  Q         |         |         |         | 14+ 0       0.0003      0.00  Q         |         |         |         | 14+ 5       0.0003      0.00  Q         |         |         |         | 14+10       0.0003      0.00  Q         |         |         |         | 14+15       0.0003      0.00  Q         |         |         |         | 14+20       0.0003      0.00  Q         |         |         |         | 14+25       0.0003      0.00  Q         |         |         |         | 14+30       0.0003      0.00  Q         |         |         |         | 14+35       0.0003      0.00  Q         |         |         |         | 14+40       0.0003      0.00  Q         |         |         |         | 14+45       0.0003      0.00  Q         |         |         |         | 14+50       0.0003      0.00  Q         |         |         |         | 14+55       0.0003      0.00  Q         |         |         |         | 761
15+ 0       0.0003      0.00  Q         |         |         |         | 15+ 5       0.0003      0.00  Q         |         |         |         | 15+10       0.0003      0.00  Q         |         |         |         | 15+15       0.0003      0.00  Q         |         |         |         | 15+20       0.0003      0.00  Q         |         |         |         | 15+25       0.0009      0.09  Q         |         |         |         | 15+30       0.0048      0.57  VQ        |         |         |         | 15+35       0.0129      1.17  |VQ       |         |         |         | 15+40       0.0233      1.51  | VQ      |         |         |         | 15+45       0.0355      1.77  |  QV     |         |         |         | 15+50       0.0499      2.10  |   QV    |         |         |         | 15+55       0.0675      2.55  |    Q  V |         |         |         | 16+ 0       0.0908      3.39  |     Q   V         |         |         | 16+ 5       0.1289      5.52  |         |Q   V    |         |         | 16+10       0.1989     10.17  |         |         Q  V      |         | 16+15       0.2697     10.27  |         |         Q         | V       | 16+20       0.3057      5.24  |         Q         |         |     V   | 16+25       0.3238      2.62  |    Q    |         |         |       V | 16+30       0.3329      1.33  | Q       |         |         |        V| 16+35       0.3353      0.34  Q         |         |         |        V| 16+40       0.3358      0.08  Q         |         |         |        V| 16+45       0.3360      0.02  Q         |         |         |        V| 16+50       0.3360      0.00  Q         |         |         |        V| 16+55       0.3360      0.00  Q         |         |         |        V| 17+ 0       0.3360      0.00  Q         |         |         |        V| 17+ 5       0.3360      0.00  Q         |         |         |        V| 17+10       0.3360      0.00  Q         |         |         |        V| 17+15       0.3360      0.00  Q         |         |         |        V| 17+20       0.3360      0.00  Q         |         |         |        V| 17+25       0.3360      0.00  Q         |         |         |        V| 17+30       0.3360      0.00  Q         |         |         |        V| 17+35       0.3360      0.00  Q         |         |         |        V| 17+40       0.3360      0.00  Q         |         |         |        V| 17+45       0.3361      0.00  Q         |         |         |        V| 17+50       0.3361      0.00  Q         |         |         |        V| 17+55       0.3361      0.00  Q         |         |         |        V| 18+ 0       0.3361      0.00  Q         |         |         |        V| 18+ 5       0.3361      0.00  Q         |         |         |        V| 18+10       0.3361      0.00  Q         |         |         |        V| 18+15       0.3361      0.00  Q         |         |         |        V| 18+20       0.3361      0.00  Q         |         |         |        V| 18+25       0.3361      0.00  Q         |         |         |        V| 18+30       0.3361      0.00  Q         |         |         |        V| 18+35       0.3361      0.00  Q         |         |         |        V| 18+40       0.3361      0.00  Q         |         |         |        V| 18+45       0.3361      0.00  Q         |         |         |        V| 18+50       0.3361      0.00  Q         |         |         |        V| 18+55       0.3361      0.00  Q         |         |         |        V| 19+ 0       0.3361      0.00  Q         |         |         |        V| 19+ 5       0.3361      0.00  Q         |         |         |        V| 762
19+10       0.3361      0.00  Q         |         |         |        V| 19+15       0.3361      0.00  Q         |         |         |        V| 19+20       0.3361      0.00  Q         |         |         |        V| 19+25       0.3361      0.00  Q         |         |         |        V| 19+30       0.3361      0.00  Q         |         |         |        V| 19+35       0.3361      0.00  Q         |         |         |        V| 19+40       0.3361      0.00  Q         |         |         |        V| 19+45       0.3361      0.00  Q         |         |         |        V| 19+50       0.3361      0.00  Q         |         |         |        V| 19+55       0.3361      0.00  Q         |         |         |        V| 20+ 0       0.3361      0.00  Q         |         |         |        V| 20+ 5       0.3361      0.00  Q         |         |         |        V| 20+10       0.3361      0.00  Q         |         |         |        V| 20+15       0.3361      0.00  Q         |         |         |        V| 20+20       0.3361      0.00  Q         |         |         |        V| 20+25       0.3361      0.00  Q         |         |         |        V| 20+30       0.3361      0.00  Q         |         |         |        V| 20+35       0.3361      0.00  Q         |         |         |        V| 20+40       0.3361      0.00  Q         |         |         |        V| 20+45       0.3361      0.00  Q         |         |         |        V| 20+50       0.3361      0.00  Q         |         |         |        V| 20+55       0.3361      0.00  Q         |         |         |        V| 21+ 0       0.3361      0.00  Q         |         |         |        V| 21+ 5       0.3361      0.00  Q         |         |         |        V| 21+10       0.3361      0.00  Q         |         |         |        V| 21+15       0.3361      0.00  Q         |         |         |        V| 21+20       0.3361      0.00  Q         |         |         |        V| 21+25       0.3361      0.00  Q         |         |         |        V| 21+30       0.3361      0.00  Q         |         |         |        V| 21+35       0.3361      0.00  Q         |         |         |        V| 21+40       0.3361      0.00  Q         |         |         |        V| 21+45       0.3361      0.00  Q         |         |         |        V| 21+50       0.3361      0.00  Q         |         |         |        V| 21+55       0.3361      0.00  Q         |         |         |        V| 22+ 0       0.3361      0.00  Q         |         |         |        V| 22+ 5       0.3361      0.00  Q         |         |         |        V| 22+10       0.3361      0.00  Q         |         |         |        V| 22+15       0.3361      0.00  Q         |         |         |        V| 22+20       0.3361      0.00  Q         |         |         |        V| 22+25       0.3361      0.00  Q         |         |         |        V| 22+30       0.3361      0.00  Q         |         |         |        V| 22+35       0.3361      0.00  Q         |         |         |        V| 22+40       0.3361      0.00  Q         |         |         |        V| 22+45       0.3361      0.00  Q         |         |         |        V| 22+50       0.3361      0.00  Q         |         |         |        V| 22+55       0.3362      0.00  Q         |         |         |        V| 23+ 0       0.3362      0.00  Q         |         |         |        V| 23+ 5       0.3362      0.00  Q         |         |         |        V| 23+10       0.3362      0.00  Q         |         |         |        V| 23+15       0.3362      0.00  Q         |         |         |        V| 763
23+20       0.3362      0.00  Q         |         |         |        V| 23+25       0.3362      0.00  Q         |         |         |        V| 23+30       0.3362      0.00  Q         |         |         |        V| 23+35       0.3362      0.00  Q         |         |         |        V| 23+40       0.3362      0.00  Q         |         |         |        V| 23+45       0.3362      0.00  Q         |         |         |        V| 23+50       0.3362      0.00  Q         |         |         |        V| 23+55       0.3362      0.00  Q         |         |         |        V| 24+ 0       0.3362      0.00  Q         |         |         |        V| 24+ 5       0.3362      0.00  Q         |         |         |        V| 24+10       0.3362      0.00  Q         |         |         |        V| 24+15       0.3362      0.00  Q         |         |         |        V| 24+20       0.3362      0.00  Q         |         |         |        V| 24+25       0.3362      0.00  Q         |         |         |        V| ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐ 764
U n i t   H y d r o g r a p h    A n a l y s i s
Copyright (c) CIVILCADD/CIVILDESIGN, 1989 ‐ 2004, Version 7.0 Study date  06/28/24
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐ San Bernardino County Synthetic Unit Hydrology Method
Manual date ‐ August 1986
Program License Serial Number 5016
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ JN 4113 UNIT HYDROGRAPH
100 YEAR 3 HOUR STORM  POST‐DEVELOPED
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Storm Event Year = 100
Antecedent Moisture Condition = 3
English (in‐lb) Input Units Used
English Rainfall Data (Inches) Input Values Used
English Units used in output format
Area averaged rainfall intensity isohyetal data:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 100

3.98 24 0.29
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ********
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 3) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)

32.0      52.0          3.98      1.000     0.785    0.130    0.102 Area‐averaged adjusted loss rate Fm (In/Hr) =  0.102
********* Area‐Averaged low loss rate fraction, Yb ********** Area       Area          SCS CN    SCS CN      S     Pervious 765
(Ac.)      Fract         (AMC2)    (AMC3)           Yield Fr

0.52 0.130 32.0 52.0 7.41 0.000

Rainfall depth area reduction factors:

Sub‐Area Duration Isohyetal
(Ac.) (hours) (In)
Rainfall data for year 100

3.98 24 0.29
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ******** Area‐averaged max loss rate, Fm ********
SCS curve SCS curve Area Area Fp(Fig C6) Ap Fm No.(AMCII) NO.(AMC 3) (Ac.) Fraction (In/Hr) (dec.) (In/Hr)

32.0      52.0          3.98      1.000     0.785    0.130    0.102 Area‐averaged adjusted loss rate Fm (In/Hr) =  0.102
********* Area‐Averaged low loss rate fraction, Yb ********** Area       Area          SCS CN    SCS CN      S     Pervious 769
(Ac.)      Fract         (AMC2)    (AMC3)           Yield Fr

0.52 0.130 32.0 52.0 7.41 0.000

Rainfall depth area reduction factors:

Using a total area of       3.98(Ac.) (Ref: fig. E‐4)
5‐minute factor = 1.000     Adjusted rainfall =  0.548(In) 30‐minute factor = 1.000    Adjusted rainfall =  1.121(In) 1‐hour factor = 1.000       Adjusted rainfall =  1.480(In) 3‐hour factor = 1.000       Adjusted rainfall =  1.480(In) 6‐hour factor = 1.000       Adjusted rainfall =  1.481(In) 24‐hour factor = 1.000      Adjusted rainfall =  1.482(In) ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ U n i t  H y d r o g r a p h
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Interval          'S' Graph          Unit Hydrograph
Number            Mean values             ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ (K =        48.13 (CFS))
1                6.442                   3.101
2               41.188                  16.724
3               81.358                  19.335
4               95.384                   6.751
5               98.630                   1.562
6              100.000                   0.659
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Total soil rain loss =      0.10(In)
Total effective rainfall =      1.38(In)
770
Peak flow rate in flood hydrograph =     13.57(CFS)
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 24 ‐ H O U R    S T O R M
R u n o f f      H y d r o g r a p h
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Hydrograph in   5   Minute intervals ((CFS))
‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐ Time(h+m) Volume Ac.Ft   Q(CFS)  0        5.0      10.0      15.0      20.0 ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐‐‐ 0+ 5       0.0000      0.00  Q         |         |         |         | 0+10       0.0000      0.00  Q         |         |         |         | 0+15       0.0000      0.00  Q         |         |         |         | 0+20       0.0000      0.00  Q         |         |         |         | 0+25       0.0000      0.00  Q         |         |         |         | 0+30       0.0000      0.00  Q         |         |         |         | 0+35       0.0000      0.00  Q         |         |         |         | 0+40       0.0000      0.00  Q         |         |         |         | 0+45       0.0000      0.00  Q         |         |         |         | 0+50       0.0000      0.00  Q         |         |         |         | 0+55       0.0000      0.00  Q         |         |         |         | 1+ 0       0.0000      0.00  Q         |         |         |         | 1+ 5       0.0000      0.00  Q         |         |         |         | 1+10       0.0000      0.00  Q         |         |         |         | 1+15       0.0000      0.00  Q         |         |         |         | 1+20       0.0000      0.00  Q         |         |         |         | 1+25       0.0000      0.00  Q         |         |         |         | 1+30       0.0000      0.00  Q         |         |         |         | 1+35       0.0000      0.00  Q         |         |         |         | 1+40       0.0000      0.00  Q         |         |         |         | 1+45       0.0000      0.00  Q         |         |         |         | 1+50       0.0000      0.00  Q         |         |         |         | 1+55       0.0000      0.00  Q         |         |         |         | 2+ 0       0.0000      0.00  Q         |         |         |         | 2+ 5       0.0000      0.00  Q         |         |         |         | 2+10       0.0000      0.00  Q         |         |         |         | 2+15       0.0000      0.00  Q         |         |         |         | 2+20       0.0000      0.00  Q         |         |         |         | 2+25       0.0000      0.00  Q         |         |         |         | 2+30       0.0000      0.00  Q         |         |         |         | 2+35       0.0000      0.00  Q         |         |         |         | 2+40       0.0000      0.00  Q         |         |         |         | 2+45       0.0000      0.00  Q         |         |         |         | 2+50       0.0000      0.00  Q         |         |         |         | 2+55       0.0000      0.00  Q         |         |         |         | 3+ 0       0.0000      0.00  Q         |         |         |         | 3+ 5       0.0000      0.00  Q         |         |         |         | 3+10       0.0000      0.00  Q         |         |         |         | 3+15       0.0000      0.00  Q         |         |         |         | 3+20       0.0000      0.00  Q         |         |         |         | 771
3+25       0.0000      0.00  Q         |         |         |         | 3+30       0.0000      0.00  Q         |         |         |         | 3+35       0.0000      0.00  Q         |         |         |         | 3+40       0.0000      0.00  Q         |         |         |         | 3+45       0.0000      0.00  Q         |         |         |         | 3+50       0.0000      0.00  Q         |         |         |         | 3+55       0.0000      0.00  Q         |         |         |         | 4+ 0       0.0000      0.00  Q         |         |         |         | 4+ 5       0.0000      0.00  Q         |         |         |         | 4+10       0.0000      0.00  Q         |         |         |         | 4+15       0.0000      0.00  Q         |         |         |         | 4+20       0.0000      0.00  Q         |         |         |         | 4+25       0.0000      0.00  Q         |         |         |         | 4+30       0.0000      0.00  Q         |         |         |         | 4+35       0.0000      0.00  Q         |         |         |         | 4+40       0.0000      0.00  Q         |         |         |         | 4+45       0.0000      0.00  Q         |         |         |         | 4+50       0.0000      0.00  Q         |         |         |         | 4+55       0.0000      0.00  Q         |         |         |         | 5+ 0       0.0000      0.00  Q         |         |         |         | 5+ 5       0.0000      0.00  Q         |         |         |         | 5+10       0.0000      0.00  Q         |         |         |         | 5+15       0.0000      0.00  Q         |         |         |         | 5+20       0.0000      0.00  Q         |         |         |         | 5+25       0.0000      0.00  Q         |         |         |         | 5+30       0.0000      0.00  Q         |         |         |         | 5+35       0.0000      0.00  Q         |         |         |         | 5+40       0.0001      0.00  Q         |         |         |         | 5+45       0.0001      0.00  Q         |         |         |         | 5+50       0.0001      0.00  Q         |         |         |         | 5+55       0.0001      0.00  Q         |         |         |         | 6+ 0       0.0001      0.00  Q         |         |         |         | 6+ 5       0.0001      0.00  Q         |         |         |         | 6+10       0.0001      0.00  Q         |         |         |         | 6+15       0.0001      0.00  Q         |         |         |         | 6+20       0.0001      0.00  Q         |         |         |         | 6+25       0.0001      0.00  Q         |         |         |         | 6+30       0.0001      0.00  Q         |         |         |         | 6+35       0.0001      0.00  Q         |         |         |         | 6+40       0.0001      0.00  Q         |         |         |         | 6+45       0.0001      0.00  Q         |         |         |         | 6+50       0.0001      0.00  Q         |         |         |         | 6+55       0.0001      0.00  Q         |         |         |         | 7+ 0       0.0001      0.00  Q         |         |         |         | 7+ 5       0.0001      0.00  Q         |         |         |         | 7+10       0.0001      0.00  Q         |         |         |         | 7+15       0.0001      0.00  Q         |         |         |         | 7+20       0.0001      0.00  Q         |         |         |         | 7+25       0.0001      0.00  Q         |         |         |         | 7+30       0.0001      0.00  Q         |         |         |         | 772
7+35       0.0001      0.00  Q         |         |         |         | 7+40       0.0001      0.00  Q         |         |         |         | 7+45       0.0001      0.00  Q         |         |         |         | 7+50       0.0001      0.00  Q         |         |         |         | 7+55       0.0001      0.00  Q         |         |         |         | 8+ 0       0.0001      0.00  Q         |         |         |         | 8+ 5       0.0001      0.00  Q         |         |         |         | 8+10       0.0001      0.00  Q         |         |         |         | 8+15       0.0001      0.00  Q         |         |         |         | 8+20       0.0001      0.00  Q         |         |         |         | 8+25       0.0001      0.00  Q         |         |         |         | 8+30       0.0001      0.00  Q         |         |         |         | 8+35       0.0001      0.00  Q         |         |         |         | 8+40       0.0001      0.00  Q         |         |         |         | 8+45       0.0001      0.00  Q         |         |         |         | 8+50       0.0001      0.00  Q         |         |         |         | 8+55       0.0001      0.00  Q         |         |         |         | 9+ 0       0.0001      0.00  Q         |         |         |         | 9+ 5       0.0001      0.00  Q         |         |         |         | 9+10       0.0001      0.00  Q         |         |         |         | 9+15       0.0001      0.00  Q         |         |         |         | 9+20       0.0001      0.00  Q         |         |         |         | 9+25       0.0001      0.00  Q         |         |         |         | 9+30       0.0001      0.00  Q         |         |         |         | 9+35       0.0001      0.00  Q         |         |         |         | 9+40       0.0001      0.00  Q         |         |         |         | 9+45       0.0001      0.00  Q         |         |         |         | 9+50       0.0001      0.00  Q         |         |         |         | 9+55       0.0001      0.00  Q         |         |         |         | 10+ 0       0.0001      0.00  Q         |         |         |         | 10+ 5       0.0001      0.00  Q         |         |         |         | 10+10       0.0001      0.00  Q         |         |         |         | 10+15       0.0001      0.00  Q         |         |         |         | 10+20       0.0001      0.00  Q         |         |         |         | 10+25       0.0001      0.00  Q         |         |         |         | 10+30       0.0001      0.00  Q         |         |         |         | 10+35       0.0001      0.00  Q         |         |         |         | 10+40       0.0001      0.00  Q         |         |         |         | 10+45       0.0001      0.00  Q         |         |         |         | 10+50       0.0001      0.00  Q         |         |         |         | 10+55       0.0001      0.00  Q         |         |         |         | 11+ 0       0.0001      0.00  Q         |         |         |         | 11+ 5       0.0001      0.00  Q         |         |         |         | 11+10       0.0001      0.00  Q         |         |         |         | 11+15       0.0001      0.00  Q         |         |         |         | 11+20       0.0001      0.00  Q         |         |         |         | 11+25       0.0001      0.00  Q         |         |         |         | 11+30       0.0001      0.00  Q         |         |         |         | 11+35       0.0001      0.00  Q         |         |         |         | 11+40       0.0002      0.00  Q         |         |         |         | 773
11+45       0.0002      0.00  Q         |         |         |         | 11+50       0.0002      0.00  Q         |         |         |         | 11+55       0.0002      0.00  Q         |         |         |         | 12+ 0       0.0002      0.00  Q         |         |         |         | 12+ 5       0.0002      0.00  Q         |         |         |         | 12+10       0.0002      0.00  Q         |         |         |         | 12+15       0.0002      0.00  Q         |         |         |         | 12+20       0.0002      0.00  Q         |         |         |         | 12+25       0.0002      0.00  Q         |         |         |         | 12+30       0.0002      0.00  Q         |         |         |         | 12+35       0.0002      0.00  Q         |         |         |         | 12+40       0.0002      0.00  Q         |         |         |         | 12+45       0.0002      0.00  Q         |         |         |         | 12+50       0.0002      0.00  Q         |         |         |         | 12+55       0.0002      0.00  Q         |         |         |         | 13+ 0       0.0002      0.00  Q         |         |         |         | 13+ 5       0.0002      0.00  Q         |         |         |         | 13+10       0.0002      0.00  Q         |         |         |         | 13+15       0.0002      0.00  Q         |         |         |         | 13+20       0.0002      0.00  Q         |         |         |         | 13+25       0.0003      0.00  Q         |         |         |         | 13+30       0.0003      0.00  Q         |         |         |         | 13+35       0.0003      0.00  Q         |         |         |         | 13+40       0.0003      0.00  Q         |         |         |         | 13+45       0.0003      0.00  Q         |         |         |         | 13+50       0.0003      0.00  Q         |         |         |         | 13+55       0.0003      0.00  Q         |         |         |         | 14+ 0       0.0003      0.00  Q         |         |         |         | 14+ 5       0.0003      0.00  Q         |         |         |         | 14+10       0.0003      0.00  Q         |         |         |         | 14+15       0.0003      0.00  Q         |         |         |         | 14+20       0.0003      0.00  Q         |         |         |         | 14+25       0.0003      0.00  Q         |         |         |         | 14+30       0.0003      0.00  Q         |         |         |         | 14+35       0.0003      0.00  Q         |         |         |         | 14+40       0.0003      0.00  Q         |         |         |         | 14+45       0.0003      0.00  Q         |         |         |         | 14+50       0.0003      0.00  Q         |         |         |         | 14+55       0.0003      0.00  Q         |         |         |         | 15+ 0       0.0003      0.00  Q         |         |         |         | 15+ 5       0.0004      0.00  Q         |         |         |         | 15+10       0.0004      0.00  Q         |         |         |         | 15+15       0.0004      0.00  Q         |         |         |         | 15+20       0.0004      0.00  Q         |         |         |         | 15+25       0.0013      0.13  Q         |         |         |         | 15+30       0.0071      0.84  VQ        |         |         |         | 15+35       0.0190      1.73  |V Q      |         |         |         | 15+40       0.0341      2.20  | V Q     |         |         |         | 15+45       0.0517      2.55  |   VQ    |         |         |         | 15+50       0.0722      2.98  |    QV   |         |         |         | 774
15+55       0.0968      3.57  |      QV |         |         |         | 16+ 0       0.1289      4.66  |        Q|V        |         |         | 16+ 5       0.1801      7.44  |         |   QV    |         |         | 16+10       0.2731     13.50  |         |         |  V   Q  |         | 16+15       0.3666     13.57  |         |         |      Q  | V       | 16+20       0.4150      7.02  |         |   Q     |         |     V   | 16+25       0.4399      3.62  |      Q  |         |         |       V | 16+30       0.4527      1.86  |  Q      |         |         |        V| 16+35       0.4560      0.49  Q         |         |         |        V| 16+40       0.4568      0.12  Q         |         |         |        V| 16+45       0.4571      0.03  Q         |         |         |        V| 16+50       0.4571      0.00  Q         |         |         |        V| 16+55       0.4571      0.00  Q         |         |         |        V| 17+ 0       0.4571      0.00  Q         |         |         |        V| 17+ 5       0.4571      0.00  Q         |         |         |        V| 17+10       0.4571      0.00  Q         |         |         |        V| 17+15       0.4571      0.00  Q         |         |         |        V| 17+20       0.4571      0.00  Q         |         |         |        V| 17+25       0.4571      0.00  Q         |         |         |        V| 17+30       0.4571      0.00  Q         |         |         |        V| 17+35       0.4571      0.00  Q         |         |         |        V| 17+40       0.4571      0.00  Q         |         |         |        V| 17+45       0.4571      0.00  Q         |         |         |        V| 17+50       0.4571      0.00  Q         |         |         |        V| 17+55       0.4571      0.00  Q         |         |         |        V| 18+ 0       0.4572      0.00  Q         |         |         |        V| 18+ 5       0.4572      0.00  Q         |         |         |        V| 18+10       0.4572      0.00  Q         |         |         |        V| 18+15       0.4572      0.00  Q         |         |         |        V| 18+20       0.4572      0.00  Q         |         |         |        V| 18+25       0.4572      0.00  Q         |         |         |        V| 18+30       0.4572      0.00  Q         |         |         |        V| 18+35       0.4572      0.00  Q         |         |         |        V| 18+40       0.4572      0.00  Q         |         |         |        V| 18+45       0.4572      0.00  Q         |         |         |        V| 18+50       0.4572      0.00  Q         |         |         |        V| 18+55       0.4572      0.00  Q         |         |         |        V| 19+ 0       0.4572      0.00  Q         |         |         |        V| 19+ 5       0.4572      0.00  Q         |         |         |        V| 19+10       0.4572      0.00  Q         |         |         |        V| 19+15       0.4572      0.00  Q         |         |         |        V| 19+20       0.4572      0.00  Q         |         |         |        V| 19+25       0.4572      0.00  Q         |         |         |        V| 19+30       0.4572      0.00  Q         |         |         |        V| 19+35       0.4572      0.00  Q         |         |         |        V| 19+40       0.4572      0.00  Q         |         |         |        V| 19+45       0.4572      0.00  Q         |         |         |        V| 19+50       0.4572      0.00  Q         |         |         |        V| 19+55       0.4572      0.00  Q         |         |         |        V| 20+ 0       0.4572      0.00  Q         |         |         |        V| 775
20+ 5       0.4572      0.00  Q         |         |         |        V| 20+10       0.4572      0.00  Q         |         |         |        V| 20+15       0.4572      0.00  Q         |         |         |        V| 20+20       0.4572      0.00  Q         |         |         |        V| 20+25       0.4572      0.00  Q         |         |         |        V| 20+30       0.4572      0.00  Q         |         |         |        V| 20+35       0.4572      0.00  Q         |         |         |        V| 20+40       0.4572      0.00  Q         |         |         |        V| 20+45       0.4572      0.00  Q         |         |         |        V| 20+50       0.4572      0.00  Q         |         |         |        V| 20+55       0.4572      0.00  Q         |         |         |        V| 21+ 0       0.4572      0.00  Q         |         |         |        V| 21+ 5       0.4572      0.00  Q         |         |         |        V| 21+10       0.4572      0.00  Q         |         |         |        V| 21+15       0.4572      0.00  Q         |         |         |        V| 21+20       0.4572      0.00  Q         |         |         |        V| 21+25       0.4572      0.00  Q         |         |         |        V| 21+30       0.4572      0.00  Q         |         |         |        V| 21+35       0.4572      0.00  Q         |         |         |        V| 21+40       0.4572      0.00  Q         |         |         |        V| 21+45       0.4572      0.00  Q         |         |         |        V| 21+50       0.4572      0.00  Q         |         |         |        V| 21+55       0.4572      0.00  Q         |         |         |        V| 22+ 0       0.4572      0.00  Q         |         |         |        V| 22+ 5       0.4572      0.00  Q         |         |         |        V| 22+10       0.4572      0.00  Q         |         |         |        V| 22+15       0.4572      0.00  Q         |         |         |        V| 22+20       0.4572      0.00  Q         |         |         |        V| 22+25       0.4572      0.00  Q         |         |         |        V| 22+30       0.4572      0.00  Q         |         |         |        V| 22+35       0.4572      0.00  Q         |         |         |        V| 22+40       0.4572      0.00  Q         |         |         |        V| 22+45       0.4572      0.00  Q         |         |         |        V| 22+50       0.4572      0.00  Q         |         |         |        V| 22+55       0.4572      0.00  Q         |         |         |        V| 23+ 0       0.4572      0.00  Q         |         |         |        V| 23+ 5       0.4572      0.00  Q         |         |         |        V| 23+10       0.4572      0.00  Q         |         |         |        V| 23+15       0.4572      0.00  Q         |         |         |        V| 23+20       0.4572      0.00  Q         |         |         |        V| 23+25       0.4572      0.00  Q         |         |         |        V| 23+30       0.4572      0.00  Q         |         |         |        V| 23+35       0.4572      0.00  Q         |         |         |        V| 23+40       0.4572      0.00  Q         |         |         |        V| 23+45       0.4572      0.00  Q         |         |         |        V| 23+50       0.4572      0.00  Q         |         |         |        V| 23+55       0.4572      0.00  Q         |         |         |        V| 24+ 0       0.4572      0.00  Q         |         |         |        V| 24+ 5       0.4572      0.00  Q         |         |         |        V| 24+10       0.4572      0.00  Q         |         |         |        V| 776
24+15       0.4572      0.00  Q         |         |         |        V| 24+20       0.4572      0.00  Q         |         |         |        V| 24+25       0.4572      0.00  Q         |         |         |        V| ‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐‐ ‐‐‐‐‐‐‐‐ 777

Fontana City CouncilJune 23, 2026

Fontana City Council
June 23, 2026