Fairfield City Council
June 16, 2026

AMENDMENT NO. 1 TO THE PROFESSIONAL SERVICES AGREEMENT WITH WEST YOST

ASSOCIATES FOR THE NORTH BAY REGIONAL WATER TREATMENT PLANT EXPLANSION

PROGRAM

On December 19, 2024, the City of Fairfield, a municipal corporation, hereinafter referred to as “CITY,” and West Yost Associates hereinafter referred to as “CONSULTANT,” entered into a Professional Services A greement for engineering design consulting services for the North Bay Regional Water Treatment Plant Expansion Program (Project).

Based upon the revised scope of work and need for continued work outside the term of the agreement, the CITY and CONSULTANT do hereby agree to amend the existing Professional Services Agreement (Agreement) as follows:

WITNESSETH:

WHEREAS, CITY desires to contract to provide additional Project scope for California Environmental Quality Act (CEQA), consultation for financial assistance loan opportunities, and Vacaville pipeline alignment study; and

WHEREAS, CONSULTANT is willing and qualified to provide the additional design services for the PROJECT; and

WHEREAS, the initial Agreement contract price was for a not to exceed amount of $1,993,100; and

WHEREAS, Amendment No. 1 will increase the total Agreement authorization by $304,100; and

NOW, THEREFORE, in consideration of the mutual promises, covenants and agreements herein set forth, the parties do hereby agree as follows:

1. Section 1, SERVICES, of the Agreement , shall be amended to included Exhibit “A1” to this Amendment.

2. Section 8, TERM, of the Agreement, shall be amended to extend the agreement for one (1 year). The Contract Term shall extend through June 30, 2027.

3. Exhibit “B”, PAYMENT, Section 1 of the Agreement, shall be amended to the following:

The total contract price for services rendered by CONSULTANT under this Agreement shall not exceed $ 2,297,200 ($1,993,100+$304,100) without CITY authorization.

IN WITNESS WHEREOF, the parties hereto have executed this Amendment on the ___ day of __________________20___.

CITY OF FAIRFIELD
A municipal corporation (CITY)

City Manager

CONSULTANT
By: _______________________________

2020 Research Park Drive Suite 100 Davis CA 95618
530.756.5905 phone 530.756.5991 fax westyost.com

June 1, 2026 SENT VIA:EMAIL

David Vong, P.E.

City of Fairfield
Department of Public Works
1000 Webster Street
Fairfield, CA 94533

SUBJECT: Proposal for Budget Augmentation for Fairfield-Vacaville Water Works (NBRWTP Expansion) Program Management Services through Fall 2026

Dear Mr. Vong:

The purpose of this letter proposal is to request an amendment to West Yost’s existing contract for the North Bay Regional Water Treatment Plant (NBRWTP) Expansion Program (Program) to provide additional not-to-exceed funding consistent with the Budget Review and Cost Projection spreadsheet (v7.1, June 2026) as shown in Attachment 1. This amendment would extend/augment budget authority for continued program management services beyond the current authorization of June 30, 2026, and for initiating selected early activities needed to maintain the schedule. The requested amendment is $304,088 to accommodate anticipated services through Fall of 2026.

SCOPE OF SERVICES
The following tasks comprise the proposed additional scope for program management services. The program has been named the Fairfield-Vacaville Water Works (FVWW), which includes an expansion and rehabilitation of the NBRWTP and related water system improvements. The tasks align with the updated FVWW Program Schedule (v6.4.1, May 2026) and are further described below.

Task 1. Continued Program Management and Project Controls through September 2026
West Yost will continue to provide overall program management and coordination services to the Cities of Fairfield and Vacaville, including master program budget/cost tracking, master schedule tracking, executive leadership meetings, technical leadership team meetings, project controls/administration, and QA/QC review of West Yost deliverables. Work elements correspond generally to the following tasks and associated direct-cost allowances.
 Task 1.1: Program Management Plan
 Task 1.2: Master Program Budget
 Task 1.3: Master Program Schedule
 Task 1.4: Technical Leadership Team Meetings include Executive Team Meetings  Task 1.5: Project Controls and Administration
David Vong, P.E.

June 1, 2026

N-C-268 FAIRFIELD-40-24-26 NBR WTP EXPANSION-PM-PROPOSALS

 Task 1.6: QC of West Yost Documents
The original scope of work through June 2026 will be completed under budget. The remaining funds of $200,096 will support continuation of Task 1 services, but only to the extent the total authorized budget is sufficient.

Remaining budget is expected to be sufficient at least through September 2026.

Task 1 Assumptions
 City staff will continue to provide timely direction and decision-making through routine program meetings.  Existing program controls (SharePoint/document management, action/decision logs, and invoicing formats) will continue to be used unless revised by mutual agreement.  The level of effort will be limited to what can be accommodated within the overall authorized budget.

Task 1 Deliverables
 Updated cost tracking summaries (periodic).
 Updated master program schedule (periodic).
 Meeting agendas/minutes and action item tracking.

Task 2 – Joint Exercise of Powers Agreement and Memorandum of Understanding (MOU) – reduction in cost through December 2026 These two subjects were originally Tasks 1 and 2 in the contract. See Attachment 2 – Scope of Services for reference.

The Joint Exercise of Powers Agreement (JEPA) defining sharing of NBRWTP capacity and costs has served the two Cities well. However, with the undertaking of a major NBRWTP expansion project, the existing JEPA needed to be evaluated.

To date, West Yost has met with relevant Fairfield and Vacaville staff and legal counsel to discuss the existing JEPA. The Cities have determined that the JEPA could stand as is, supplemented by a new Memorandum of Understanding (MOU). The MOU is being developed by City staff and counsel from both Cities to address the FVWW program, ongoing operations and maintenance needs, and the cost sharing around both.

The legal teams are developing an MOU as of the date of this letter proposal. West Yost will continue to provide technical input as the MOU is developed. Just over half of the remaining funds, approximately $57,600, will be reallocated to other tasks and the remaining Task 2 budget will be retained to participate through completion of the MOU.

Task 3 – Data Collection and Additional Studies - reduction in cost The primary objective of this task was to provide the additional data necessary to ensure that the future design of NBRWTP improvements adequately balances the need for capacity, treated water quality, operational flexibility, and cost-effectiveness. Task 3 includes the following subtask:
 Task 3.1: Existing Information Review Workshop (completed)  Task 3.2: Sampling and Data Collection Plan (completed)  Task 3.3: Data Collection and Analysis (in progress)
 Task 3.4: Challenge Testing (completed)
 Task 3.5: Distributed Energy Resources Evaluation (in progress) David Vong, P.E.

June 1, 2026

N-C-268 FAIRFIELD-40-24-26 NBR WTP EXPANSION-PM-PROPOSALS

 Task 3.6: Defining Electrical, Instrumentation and Controls Requirements (in progress) The majority of this task will be completed by the end of June 2026. The current Task 3 budget will be reduced by approximately $21,600, which can be reallocated to other tasks.

Task 3 Assumptions
 Electrical, Instrumentation and Controls Requirements to be included in the Project Technical Requirements

Remaining Task 3 Deliverables
 Project Data (organized water quality and performance data, digitized archives)  Distributed Energy Resources TM
Task 4 – Vacaville Capacity Strategy – scope and budget augmentation Vacaville was faced with important decisions regarding the buildout of its water supply portfolio and needed to more clearly define its future surface water and groundwater supply mix. Of particular importance, the continued use of existing facilities needed to be defined, including its Diatomaceous Earth Water Treatment Plant (DEWTP) and several of its existing water supply wells, which are aging and experiencing water quality issues due to contaminants of concern (e.g, Cr6+ and PFAS). These issues directly impact the allocation of treatment capacity at the NBRWTP needed for Vacaville and cost allocations between the two Cities. Accordingly, West Yost has prepared an evaluation and technical memorandum (TM) documenting Vacaville’s plan for using NBRWTP capacity. Key subtasks performed under Task 4 included:
 Task 4.1. Refinement of Demand Projections
 Task 4.2. Evaluation of Surface Water and Groundwater Supply Options  Task 4.3. Vacaville Capacity Strategy TM
Task 4 will be completed by finalizing the Technical Memo by the end of June 2026, or shortly thereafter, barring additional scope changes. The scope and budget is increased to include performing and documenting additional analyses of future distribution system impacts and improvements, and consideration of various well production scenarios. Additional funding is required to cover the work. The requested amendment amount is $19,297 and will only accommodate minor changes.

Task 4 Deliverable
 Updated and finalized TM
Task 5: Facilities Planning – reduction in cost
Under this task, facilities planning and workshops with operations staff were performed to develop a Project Technical Requirements document (PTR) providing the basis for the later detailed design of NBRWTP improvements. The facilities planning defined and evaluated a potential capacity phasing for meeting near- and long-term capacity needs and includes a planning level cost estimate. The PTR will incorporate the findings and conclusions of the May 24, 2024 technical memorandum (TM) titled “NBRWTP Condition Assessment, Performance Evaluation, and Expansion Analysis” (May 2024 NBRWTP TM). The key subtasks performed under Task 5 include:
 Task 5.1. Raw and Treated Water Quality Characterization David Vong, P.E.

June 1, 2026

N-C-268 FAIRFIELD-40-24-26 NBR WTP EXPANSION-PM-PROPOSALS

 Task 5.2. Existing Facilities Description
 Task 5.3-5.5: Project Technical Requirements Development  Task 5.6. Project Implementation Plan
 Task 5.7. Cost Estimate
 Task 5.8. Project Technical Requirements Document
Task 5 is expected to be completed by the end of June 2026, producing Project Technical Requirements in lieu of a report.

Task 5 Assumptions
 The governing technical requirements defining the needed Fairfield infrastructure (e.g., Cement Hill reservoir) will be developed largely by the City or under separate contract.  Cost estimates for added Fairfield infrastructure will rely on cost information provided by the City.  The Implementation Plan will be a brief, general description of schedule, project delivery method(s) and management plan to be incorporated in the Business Case Report (Task 8) and/or the Program Management Plan (Task 1).

Remaining Task 5 Deliverables
 Project Technical Requirements to be referenced in the progressive design-build contract.  Update to the cost estimate and cost allocation incorporating the ongoing cost sharing evaluation.

Task 6. Outside Funding – scope and budget augmentation Task 6 includes substantial added scope, including preparation of multiple funding applications. The minimum amendment would cover requested work performed to date, plus a $10,000 allowance for ongoing coordination. Assistance with any further loan application materials is not included in the budget, so a further budget amendment would be needed to allow for preparation of an Engineering Report to support an SRF loan application.

Subtasks under this effort included:
 Task 6.1: Funding Research (future work not budgeted)  Task 6.2: Meetings with Funding Agencies (future work not budgeted)  Task 6.3: Funding Strategy TM (completed)
 Task 6.4: Ongoing Opportunity Monitoring (future work not budgeted)  Task 6.5: Emerging Contaminants Grant Application – Vacaville (future work not budgeted)  Task 6.6: SRF Loan Application – Vacaville (future work not budgeted)  Task 6.7: SRF Loan Application – Fairfield (future work not budgeted)  Task 6.8: I-Bank Loan Application – Vacaville (future work not budgeted)  Task 6.9: I-Bank Loan Application – Fairfield (future work not budgeted)  Task 6.10: Congressionally Directed Funding Applications – Vacaville (future work not budgeted)
The requested amendment amount is $141,754.

David Vong, P.E.

June 1, 2026

N-C-268 FAIRFIELD-40-24-26 NBR WTP EXPANSION-PM-PROPOSALS

Task 6 Assumptions
 City staff will conduct all ongoing coordination with funding agency(s).  No further progress on loan application documents will be needed unless and until the budget and scope are further amended.

Task 6 Deliverables
 None.

Task 7. Project Delivery Method Evaluation
A variety of project delivery methods are available for the NBRWTP expansion and related offsite projects, including traditional design-bid-build as well as collaborative project delivery methods such as progressive design-build. Key subtasks include:
 Task 7.1. Consultations with Staff and Legal Counsels of Both Cities  Task 7.2. Project Delivery Methods TM
 Task 7.3. Informational and Strategic Meetings/Workshops/Presentations West Yost has presented information and worked with the Cities to select progressive design build (PDB) for delivery of at least the NBRWTP improvements. The PDB contract will likely be used for the offsite improvements as well, unless a separate delivery method is more advantageous. Information was documented in a TM for presentation to both City Councils with a recommended approach based on the staff discussions.

This TM will now be on the same schedule to finalize as Task 8, the Business Case Documentation.

Task 7 will now include as-needed meetings or study sessions with staff and/or City Councils, as can be performed within the available budget. These may include strategic discussions to determine how various project elements might be phased within a single or multiple contracts.

Task 7 Assumptions
 One minor update to the draft memorandum may occur within the revised budget.  Preparation and participation in strategic meetings, workshops, or presentations will be provided within the limitation of available budget, according to project needs.

Task 7 Deliverables
 Final project delivery recommendations TM
Task 8: Business Case Documentation – scope augmentation The schedule for this task has shifted as the program has evolved. The current schedule for completion is early fall of 2026.
 Task 8.1. Business Case Report
 Task 8.2. City Council Presentations/Hearings
David Vong, P.E.

June 1, 2026

N-C-268 FAIRFIELD-40-24-26 NBR WTP EXPANSION-PM-PROPOSALS

Task 8 is currently projected through completion with no substantive change from the original budget; however, incorporating work by Bartle Wells was not originally anticipated. Completion of an initial draft is anticipated before the end of June 2026, with a finalized document by the end of 2026, allowing time for Council communications and incorporation of the financing plan, assuming it will be ready by then.

The original budget for Task 8 is adequate for the remaining work as currently projected.

Task 8 Assumptions
 Two City Council meetings/hearings (one for each City)  Bartle Wells is preparing a financing plan, the findings of which may be summarized in the Business Case Report if they are timely and easily incorporated.  Planning level costs with ample contingencies will be presented  The budget and scope for this task will be reviewed and updated (if necessary) as the project progresses

Task 8 Deliverables
 Draft and final Business Case Report
 Presentation materials for City Council meetings/hearings if needed.

Task 9: As-Needed Services – budget augmentation
Task 9 funds are for services not anticipated at the time of budgeting. After the initial budget was fully reallocated, $6,548 was invoiced under this task in July 2025 and is included in the requested amendment.

The charges were associated with early Outside Funding research related to a potential HMGP grant application, plus a small amount (4 hours) of internal management. The time was invoiced under Task 9 rather than Task 6 (or 1).

Task 10: Develop PDB Procurement Documents – scope and budget augmentation
This task includes creating the Request for Proposal (RFP) and assisting with preparation of a draft contract for progressive design build (PDB) services. This work was not included in the original scope.

West Yost has begun to develop a draft RFP, and has assisted in determining that a contract template from the Design Build Institute of America will be provided to legal counsel for consideration. The remaining budget less a small allowance for close out activities will be reallocated, such that no further progress on the draft RFP or PDB contract will be made absent a subsequent budget and scope amendment.

Task 10 Assumptions
 No further work on an RFP or PDB contract is needed at this time.  West Yost does not provide legal advice.

Task 10 Deliverables
 None.

Task 91: Environmental Review – scope and budget augmentation Task 91 was not included in the original scope and budget but was added to facilitate timely environmental review with the City’s concurrence that a budget amendment would be necessary. This task includes work David Vong, P.E.

June 1, 2026

N-C-268 FAIRFIELD-40-24-26 NBR WTP EXPANSION-PM-PROPOSALS

by LSA (as a subconsultant to West Yost) conducting field work, research and preparation of a CEQA document plus additional information to facilitate required federal consultations for SRF funding, and coordination and work by the project team to prepare mapping and documentation. Some funds in the original budget were reallocated to this task from Task 9 and Task 1. The minimum amendment in the amount of $297,300, includes all anticipated work through the end of 2026 for completion of the CEQA document. The amendment does not include funding for the environmental permitting assistance.

Please refer to separate scope of work documents defining LSA’s services, provided in Attachment 3.

Task 92: Pipeline Alignment Study – scope and budget augmentation This task includes a study to evaluate different pipeline alignment options for a new transmission main from the NBRWTP to the City of Vacaville. The original scope for this is provided in Attachment 4. The scope was modified to omit profile drawings and add analyses including mapping existing utilities in more detailed plan view at points of connection, evaluating constraints at the Putah South Canal crossing, and adding the Peabody Road alignment. Upon completion of a draft document, it was requested that an additional alignment option be added to the analysis.

Task 92 was funded by moving budget from Tasks 1 and 9. The scope was not included in the original budget. A revised memo with an added alignment (Peabody Rd) will be completed before June 30, 2026, requiring a 5% increase in the previously allocated task budget (approximately $5,400).

PROJECT BUDGET
West Yost’s proposed additional budget for the tasks described above is summarized in the column labeled “Amendment Amount” in Attachment 1. Work will be performed in accordance with the terms of the Professional Services Agreement between the City of Fairfield and West Yost dated December 18, 2024, as amended. The requested budget augmentation is $304,088, resulting in a revised total not-to-exceed amount of $2,297,188. The anticipated allocation to the tasks described above is shown in Attachment 1 and is subject to reallocation in accordance with program needs.

SCHEDULE
West Yost will continue working with the Cities to maintain the master program schedule and adjust task sequencing as needed. This amendment includes services at least through September 2026. We understand the contract duration will be extended to December 31, 2026 or later, such that services could continue if needed, to the extent the budget allows.

Thank you for the opportunity to continue supporting the Cities of Fairfield and Vacaville on this important Program. We look forward to working with your team to maintain momentum toward procurement and project delivery. Please contact us if you have any questions or would like to discuss this amendment request.

Sincerely,

WEST YOST

Jeffrey D. Pelz, PE Dianna Jensen, PE
Vice President Engineering Manager
RCE #46088 RCE #56636
David Vong, P.E.

June 1, 2026

N-C-268 FAIRFIELD-40-24-26 NBR WTP EXPANSION-PM-PROPOSALS

cc: Justen Cole, City of Vacaville
Michael Hether, City of Fairfield
Attachment(s): Attachment A. Budget Review and Cost Projection – Requested Budget Augmentation Attachment B: Original Attachment A: Scope of Services
Attachment C: LSA Scope of Services
Attachment D: Scope of work – Pipeline Alignment Study [Task 92]

Budget Review and Cost Projection – Requested Budget
Augmentation

Attachment A
Fairfield-Vacaville Water Works
Program Management / OA Services
Revised 6-1-2026
Continue Active High Priority Activities, $
Scope Item
Original
Budget
Reallocated
Original Budget
Amount Earned
Remaining
Budget (5/22/26)
Amendment
Amount
Resultant
Remaining
Budget
Resultant Total
Budget
Scope of Work and Budget Notes
Task 1: Project Management and Program Coordination
954,800

738,891

538,795

200,096

-

200,096

738,891

Continue Critical Tasks
Task 2: Joint Exercise of Powers Agreement MOU
112,300

112,400

6,062

106,338

(57,627)

48,711

54,773

Task 3: Data Collection and Additional Studies
199,500

228,709

139,415

89,294

(21,602)

67,692

207,107

Task 4: Vacaville Capacity Strategy
103,000

103,000

117,297

(14,297)

19,297

5,000

122,297

Task 5: Facilities Planning
296,400

296,400

136,341

160,059

-

160,059

296,400

Task 6: Outside Funding
49,600

49,700

181,454

(131,754)

141,754

10,000

191,454

Continue Critical Tasks
Task 7: Project Delivery Method Evaluation
56,200

56,200

21,462

34,738

-

34,738

56,200

Task 8: Business Case Documentation
60,100

60,100

27,989

32,111

-

32,111

60,100

Task 10: Develop PDB Procurement Documents
-

150,000

57,132

92,868

(87,000)

5,868

63,000

Progressive DB RFP and Draft Contract
Task 10 was not included in the original budget, but was funded using budget from the As-Needed Services (Task 9). Minor current charges and file organization will be conducted, but further work on
the documents will be halted.

Pre-RFP outreach or meetings with prospective PDB teams to promote interest in the project are not included.

Without an amendment, the current remaining budget will be sufficient through at least September
2026
. We will work with City staff to determine whether the duration can be extended further within available funds.

Task 2 will be completed by the end of 2026. The amendment reduces the scope and budget by more than 50%, reflecting current program needs, with the City attorney leading efforts to develop an MOU.

Task 3 will be completed by the end of June 2026, with expanded scope of analysis for Distributed Energy Resources and electrical requirements. The original budget will have been increased by a net 4%.

Task 4 will be completed by finalizing the Technical Memo by the end of June 2026, or shortly thereafter, barring additional scope changes. The scope and budget has increased to include performing and documenting additional analyses of future distribution system impacts and improvements, and consideration of various well production scenarios.

Only minor edits to the draft
TM will be accommodated within the amended budget.

Task 5 is expected to be completed by the end of June 2026, producing Project Technical Requirements in lieu of a report, within the original task budget.

Task 6 includes substantial new scope, including investigation and preparation of multiple funding applications (EC Grant, Congressionally Directed Funding, progress on SRF applications, investigation of I-Bank loan requirements, etc.). The amendment would cover requested work performed to date, plus a small amount of coordination with others preparing SRF loan application(s) by the end of 2026.

The budget does not allow for preparation of any further SRF application documentation such as an Engineering Report.

Task 7 will be completed with a 24% reduction from the original budget.

The revised budget allows for
finalizing the draft memorandum without substantive changes, procurement strategy discussions and/or workshops.

Task 8 is currently projected through completion with no substantive change from the original budget; however, incorporating work by Bartle Wells was not originally anticipated. Completion of an initial draft is anticipated before the end of June 2026, with a finalized document by the end of 2026, allowing time for Council communications and incorporation of the financing plan.

Budget Review and Cost Projection - June 2026 (V7.1).xlsx Fairfield-Vacaville Water Works
Program Management / OA Services
Revised 6-1-2026
Continue Active High Priority Activities, $
Scope Item
Original
Budget
Reallocated
Original Budget
Amount Earned
Remaining
Budget (5/22/26)
Amendment
Amount
Resultant
Remaining
Budget
Resultant Total
Budget
Scope of Work and Budget Notes
Without an amendment, the current remaining budget will be sufficient through at least September
Task 91: Environmental Review
-

102,500

236,214

(133,714)

297,300

163,586

399,800

91.01: Mapping, Documents and Coordination
Continue Critical Tasks

91.1x: LSA Subcontract
CEQA Documents
Task 92: Pipeline Alignment Study
-

95,200

96,869

(1,669)

5,384

3,715

100,584

Task 9: As-Needed Services
161,200

-

6,582

(6,582)

6,582

-

6,582

Total
1,993,100

1,993,100

1,565,612

427,488

304,088

731,577

2,297,188

Task 91 was not included in the original scope and budget but was added with the understanding that a budget amendment would be necessary. This task includes LSA's work conducting field work, research and preparation of a CEQA document plus additional information to facilitate required federal consultations for SRF funding, and coordination and work by the project team to prepare mapping and documentation. Some funds in the original budget were reallocated from Task 9 and Task 1. The amendment includes all anticipated work through the end of 2026 for completion of the CEQA document.

LSA permitting assistance and related services are not included.

Task 92 was funded from Tasks 1 and 9. The scope was not included in the original budget. A revised memo with an added alignment (Peabody Rd) will be completed before June 30, 2026, requiring a 5% increase in the task budget.

Task 9 funds are for services not anticipated at the time of budgeting. The original budget was fully reallocated, however $6,582 was invoiced in July 2025. The charges were associated with early Outside Funding research related to a potential HMGP grant application, plus a small amount (4 hours) of internal management. The time was invoiced under Task 9 rather than Task 6 (or 1).

Budget Review and Cost Projection - June 2026 (V7.1).xlsx

Original Attachment A: Scope of Services

Attachment B

OCTOBER 10, 2024
EARYEAR2020
Attachment 2

NBRWTP Expansion Program Management
Initial Scope of Services
(FY 24/25 and FY 25/26)

Prepared for

City of Fairfield
&
City of Vacaville

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
i City of Fairfield
City of Vacaville

Table of Contents
Task 1. Memorandum of Understanding ................................ ................................ ............................. 1 Task 2. Joint Powers Agreement Update ................................ ................................ ............................. 2 Task 3. Data Collection and Additional Studies ................................ ................................ ....................3 Task 3.1. Existing Information Review Workshop .................................................................................. 3 Task 3.2. Sampling and Data Collection Plan .......................................................................................... 3 Task 3.3. Data Collection and Analysis ................................................................................................... 3 Task 3.4. Additional Studies ................................................................................................................... 4 Task 4. Vacaville Capacity Planning ................................ ................................ ................................ .....5 Task 4.1. Refinement of Demand Projections ........................................................................................ 5 Task 4.2. Evaluation of Surface Water and Groundwater Supply Options............................................. 5 Task 4.3. Vacaville Capacity Strategy TM ............................................................................................... 7 Task 5. Facilities Planning ................................ ................................ ................................ ...................7 Task 5.1. Raw and Treated Water Quality Characterization .................................................................. 8 Task 5.2. Existing Facilities Description .................................................................................................. 8 Task 5.3. Need for Project ...................................................................................................................... 8 Task 5.4. Treatment Performance and Technology Goals ..................................................................... 8 Task 5.5. Benchmark Project Development ........................................................................................... 8 Task 5.6. Project Implementation and Schedule .................................................................................... 9 Task 5.7. Cost Estimates ......................................................................................................................... 9 Task 5.8. Benchmark Design Report ....................................................................................................... 9 Task 6. Outside Funding ................................ ................................ ................................ ................... 10 Task 7. Project Delivery Method Evaluation ................................ ................................ ...................... 11 Task 8. Business Case Documentation ................................ ................................ ............................... 12 Task 9. Project Management and Program Coordination ................................ ................................ ... 13 Task 9.1. Program Management Plan (PMP)........................................................................................ 13 Task 9.2. Program Budgeting and Cashflow Projections ...................................................................... 13 Task 9.3. Program Schedule ................................................................................................................. 13 Task 9.4. Progress Monitoring and Invoicing ....................................................................................... 13 Task 10. As-Needed Services ................................ ................................ ................................ ............ 14 General Assumptions ................................ ................................ ................................ ....................... 14 Unknowns Potentially Affecting Scope, Schedule and/or Budget ................................ ....................... 15

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
1 City of Fairfield
City of Vacaville

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management
for the Cities of Fairfield and Vacaville

West Yost Associates (West Yost) will provide management and engineering services related to increasing the capacity of the City of Fairfield (Fairfield) North Bay Regional Water Treatment Plant (NBRWTP) and addressing related treated water distribution needs. This scope of work includes overall management of the many interrelated activities, engineering services to assess and define needs both at the NBRWTP as well as offsite, and related professional services needed to advance all aspects of the program. A budget has been developed for initial elements of this scope. It is anticipated that this scope of work and the associated budget will be amended and adapted over the course of the project to meet the needs of the Cities of Fairfield and Vacaville.

The major tasks included in this scope of work include:
• Task 1. Memorandum of Understanding
• Task 2. Joint Powers Agreement Update
• Task 3. Data Collection and Additional Studies
• Task 4. Vacaville Capacity Strategy
• Task 5. Facilities Planning
• Task 6. Outside Funding
• Task 7. Project Delivery Method Evaluation
• Task 8. Business Case Documentation
• Task 9. Project Management and Program Coordination
• Task 10. As-Needed Services
TASK 1. MEMORANDUM OF UNDERSTANDING
Fairfield and Vacaville will need to work in tandem and to coordinate efforts, activities, and cost sharing throughout the planning phase of the NBRWTP expansion. A memorandum of understanding (MOU) will be developed at the outset of the Project to establish the major points of understanding between the two Cities. The framework of the MOU will be developed by the staff of both Cities with the assistance of West Yost. Thereafter a meeting will be held with the legal counsels for each City to refine the cont ent and structure of the MOU. West Yost will prepare technical content for incorporation into a full draft MOU by the Cities’ legal counsel. If desired, West Yost will then assist with optional study sessions for each City Council to discuss the MOU and the scope and status of the Project. City staff/legal counsel will adjust the draft MOU to reflect the input of the City Councils. West Yost will prepare a revised draft MOU based on cost projections and the initial cost sharing terms for the first phases of work. Following City review, West Yost will prepare a final MOU (for approval by the respective legal counsel and City Management) . Key subtasks to be performed under Task 1 include:
• Task 1.1. Framework for MOU
• Task 1.2. Meeting with Legal Counsels
• Task 1.3. City Council Study Sessions (Optional)
• Task 1.4. Draft, Revised Draft, and Final MOU

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
2 City of Fairfield
City of Vacaville

Task 1 Assumptions
• One meeting with the staff of both Cities to establish the MOU framework • One meeting with the legal counsels of both Cities
• One study session with each City Council (two sessions total, Optional)

Task 1 Deliverables
• Draft, revised draft, and final MOU document
• Agendas and summary notes for each meeting/study session TASK 2. JOINT POWERS AGREEMENT UPDATE
The Joint Powers Agreement (JPA) defining sharing of NBRWTP capacity and costs has served the two Cities well. However, with the undertaking of a major NBRWTP expansion project, the existing JPA needs to be reviewed and updated. The purpose of this task is to review the existing JPA with both Cities and to develop revisions to the JPA as appropriate. Accordingly, the key subtasks to be performed under Task 2 include:
• Task 2.1. JPA Review/Draft Modifications
• Task 2.2. Council Workshops
• Task 2.3. Revised JPA Draft
Initially, West Yost will meet with relevant Fairfield and Vacaville staff and with the legal counsels of both Cities to discuss the existing JPA, to consider potential shortcomings of the existing agreement, and to craft revised/augmented agreement language. A working draft of the revised JPA will be produced at this stage for review by staff and one further revision before being presented to each City Council via a workshop. During each of the two workshops, the need for and benefits of revising the agree ment language will be explained. West Yost will then prepare a revised draft JPA based on feedback from both Cities for attorney review and finalization.

Task 2 Assumptions
• One meeting with the staff and legal counsels of both Cities to craft revised JPA language • One follow-up discussion of revised draft
• One workshop with each City Council (two sessions total) • Legal counsel from one of the Cities will be responsible for final review, preparation of the final documents, and guiding the formal approval process
• The existing JPA will be updated through limited revisions focusing on cost sharing and other minor changes. An extension re-write will not be necessary

Task 2 Deliverables
• Draft and two revised draft JPA documents
• Agendas and summary notes for each meeting/workshop

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
3 City of Fairfield
City of Vacaville

TASK 3. DATA COLLECTION AND ADDITIONAL STUDIES
To support updated, detailed analyses of the performance of existing facilities and the need for additional facilities and/or operational changes, additional data collection and investigations are needed. The primary objective of this task is to provide the additional data necessary to ensure that the design of future NBRWTP improvements adequately balances the need for capacity, treated water quality, operational flexibility, and cost-effectiveness. The key subtasks to be performed under Task 3 include:
• Task 3.1. Existing Information Review Workshop
• Task 3.2. Sampling and Data Collection Plan
• Task 3.3. Data Collection and Analysis
• Task 3.4. Additional Studies
Task 3.1. Existing Information Review Workshop
West Yost will conduct a workshop with NBRWTP staff to determine what additional information, if collected ahead of time, would best aid design efforts for future NBRWTP expansion, including improved capabilities for treatment of source water during period s of more challenging raw water quality. As part of the workshop, West Yost staff will also review available hard copy documentation from past design and construction projects. West Yost will work with NBRWTP staff to identify documents that would be helpful to digitize and organize for future reference by designers, construction managers, and potential bidders.

Actual collection, digitization, organization and analysis of data and documents will be completed under Task 3.3.

Task 3.2. Sampling and Data Collection Plan
For the parameters identified in the workshop, West Yost will produce a sampling and data collection plan. The plan will describe recommended parameters, locations, frequencies, and durations for sampling.

For non -water quality-based data collection recomm endations, the plan will summarize the type and quantity of data to be collected, and will identify any instruments or other resources needed to gather the data. Additionally, the plan will include Excel -based templates recommended for storing collected data (primarily numerical data) and folder structures recommended for organizing and storing digitized hard copy documents.

Task 3.3. Data Collection and Analysis
Based on recommendations from the workshop, existing hard copy documentation will be digitized by West Yost with assistance from Fairfield staff and will be organized in a logical and searchable format.

Data collected in accordance with the sampling and data collection plan will be incorporated by West Yost into Excel-based spreadsheets. Raw data will be screened for outliers, and preliminary, high-level analysis of summary statistics and trends will be performed. The objective of the analysis will be to id entify any combination of: unforeseen results, confirmation of preliminary assessments, and/or indications that one or more additional studies or process modifications is clearly warranted. The results of the analysis will be presented in a technical memorandum (TM).

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
4 City of Fairfield
City of Vacaville

Task 3.4. Additional Studies
Beyond the sampling and data collection needs identified under Tasks 3.2 and 3.3, additional, targeted studies are needed to address concerns related to power availability, pretreatment (flocculation/ sedimentation) facilities, and filtration facilities. Accordingly, the following special studies are included in this scope:
• Distributed Energy Resources (DER) Evaluation
• Pretreatment Challenge Testing
• Filter Challenge Testing
The DER Evaluation involves assessing the potential for Fairfield to make use of its existing photovoltaic array in conjunction with a battery power storage system to allow for more flexible NBRWTP operations during peak demand periods and potentially provide seamless transition from and to the electric utility.

The Pretreatment Challenge Testing involves stress testing each of the three NBRWTP flocculation/ sedimentation units to determine the actual capacity of each unit in comparison to the rated capacity of each. As part of this effort, West Yost will assist with the development of a draft test protocol . Testing would be performed by Fairfield staff with assistance from West Yost.

The Filter Challenge Testing involves analyzing the performance of the existing filters over the full range of historical loading rates, evaluating the impact of the effective size of the granulated activated carbon and sand media layers on filter headloss and run times, and analyzing the relationship between clarified washwater parameters and filter runtimes under a variety of operational scenarios. Based upon the results of this analysis, a protocol will be developed and implemented to test the existing filters at a range of loading rates to better understand their ability to meet performance goals. Testing would be performed by Fairfield staff with assistance from West Yost.

It is expected that NBRWTP staff will conduct the challenge tests, however, 20 hours has been included to provide as needed on -site assistance. A subconsultant will be retained by West Yost to collect media core samples.

For each of these additional studies, draft and final TMs will be produced to document the findings.

Task 3 Assumptions
• Two workshops with NBRWTP staff; one ahead of testing protocol development and one to review the results of the data analysis and challenge tests.
• One meeting each (three total) with NBRWTP staff to discuss implementation of the three additional studies
• One meeting with DDW to discuss pretreatment testing protocol • City staff will extract data and collect and analyze samples with limited assistance from West Yost commensurate with an agreed budget allocation
• The budget includes an allowance for subconsultant services that will be adjusted when the media sampling scope is determined

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
5 City of Fairfield
City of Vacaville

Task 3 Deliverables
• Workshop/meeting agendas and summary notes
• Draft and final sampling and data collection plan (Task 3.2) • Draft and final TM of findings (Task 3.3)
• Draft and final pretreatment testing protocol (Task 3.4) • Draft and final filter testing protocol (Task 3.4)
• Draft and final DER evaluation TM (Task 3.4)
• Draft and final pretreatment testing results TM(Task 3.4) • Draft and final filtration testing results TM (Task 3.4) TASK 4. VACAVILLE CAPACITY PLANNING
Vacaville is faced with important decisions regarding the buildout of its water supply portfolio and needs to more clearly define its future surface water and groundwater supply mix. Of particular importance, the continued use of existing facilities needs to be defined, including its Diatomaceous Earth Water Treatment Plant (DEWTP) and several of its existing water supply wells, which are aging and experiencing water quality issues due to contaminants of concern (i.e., Cr6+). These issues are relevant to th e expansion of the NBRWTP as assumptions made for other City facilities directly impact the allocation of treatment capacity needed for Vacaville and cost allocations between the two Cities. Accordingly, Vacaville needs to finalize its plan for using NBRWTP capacity, in both the near/medium -term and the long -term. Key subtasks to be performed under Task 4 include:
• Task 4.1. Refinement of Demand Projections
• Task 4.2. Evaluation of Surface Water and Groundwater Supply Options • Task 4.3. Vacaville Capacity Strategy TM
Each of these tasks are described further in the following sections.

Task 4.1. Refinement of Demand Projections
The City of Vacaville completed a Water Master Plan Update (Vacaville WMPU) in February 2023 that examined different water supply alternatives in light of growing water demands and emerging water quality concerns. The demand projections developed as part of the Vacaville WMP are based on a series of conservative assumptions and development information available at the time of preparation of the Vacaville WMPU. In this task, demand projections will be reviewed to better define Vacaville’s surface water needs in both the near/medium -term and the long -term. This includes reviewing updated production information and determining if demand trends are growing at a rate similar to or less than what was defined in the Vacaville WMPU.

Task 4.2. Evaluation of Surface Water and Groundwater Supply Options The Vacaville WMPU considered two different surface water treatment options: (1) construction of a new WTP facility, (2) expansion of its share of the NBRWTP coupled with a rebuilding of the DEWTP. The WMPU did not, however, consider consolidating all surface water treatment at the NBRWTP. In addition, as mentioned above, the City’s existing groundwater well facilities have been impacted by CR6+. Recently issued regulations for Cr6+ have impacted Wells 3, 9, 14, 15, and 16, which all have concentrations of Cr6+ that exceed the MCL of 10 micrograms per liter. As a result, future surface water supply planning should factor in the need for blending and/or planned wellhead treatment options as well as considering

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
6 City of Fairfield
City of Vacaville

increased surface water supplies. Under near-term conditions the City will likely need to rely on additional surface water deliveries in the interim while it concurrently works on addressing wells with Cr6+.

Using the update d demand projections developed under Task 4.1, t he evaluation of additional supply alternatives will be accomplished as follows:

1. Conduct a Supply Strategy Alternatives Workshop to identify which new long-term and interim supply alternatives will be modeled to determine treatment and conveyance capacity needs under both near-term and long-term demand scenarios. During the workshop West Yost and City staff will agree on up to four scenarios to be evaluated using the City’s hydraulic model to identify infrastructure and associated sizing. The following parameters will be agreed upon for each scenario to be evaluated:
a. Demand Scenario: Buildout, Long-term (Pre-Buildout), or Interim (near term / mid term). b. Status of DE Plant: Converted to Storage/Blending facility, or Fully Abandoned. c. Treatment Location: NBR Capacity plus (if any) Capacity within Vacaville d. Groundwater Wells: Producing at Sustainable Yield, or Producing at Less Than Sustainable Yield due to loss of capacity for Cr6+ mitigation.

Based on conversations with City staff and internally, the following alternatives are likely examples of the four scenarios that will be refined and adopted at the workshop for subsequent modeling:

Option A: Buildout Scenario
• Demands: Buildout per the WMPU or refined based on Task 4.1 • Wells producing at the sustainable yield
• DE plant site used only for blending of water from selected wells • NBR producing the balance of supply needed to meet demands Option B: Highest Potential Need from NBR
• Same as Option A, except reduced well production
• Possible Variation: Use long-term (pre-buildout) demands Option C: Interim Conditions (tests near-term adequacy of existing conveyance) • Demands projected for near- to mid-term
• All wells impacted by Cr6+ assumed to be offline
• DE plant not operational
• NBR producing the balance of supply needed to meet demands Option D: Interim Condition with Full Groundwater
• Same as Option C, except wells producing at the sustainable yield • DE plant site used only for blending of water from selected wells

2. Perform a hydraulic evaluation of the identified alternatives to assess the improvements necessary to meet demands. The evaluation will include preparing planning-level estimates of capital costs for each evaluated scenario.

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
7 City of Fairfield
City of Vacaville

3. Meet with City staff to review the results and select project criteria for the NBRWTP Expansion Program. Specifically, what near -term and long -term capacity is needed at the NBRWTP for Vacaville, and what near-term and long-term offsite improvements are needed to accommodate the NBRWTP supply.

Task 4.3. Vacaville Capacity Strategy TM
Upon completion of the investigations performed under Tasks 4.1 and 4.2, a TM of findings will be produced that will document decisions about Vacaville’s capacity needs from the NBRWTP , including conceptual offsite transmission facilities. A draft TM will be produced for Vacaville staff review and will be finalized based on comments and input received. Fairfield’s NBRWTP capacity needs will be summarized under Task 5.

Task 4 Assumptions
• One workshop with Vacaville staff to discuss the parameters of the modeling to be performed under Tasks 4.2.
• Hydraulics will be evaluated for up to four scenarios • One meeting with Vacaville staff to discuss and agree on a basis for Vacaville’s NBR capacity needs and offsite infrastructure.

Task 4 Deliverables
• Agenda and summary notes for the workshop and meeting with Vacaville staff • Draft and final NBRWTP Capacity Strategy TM
TASK 5. FACILITIES PLANNING
Under this task, facilities planning will be performed that results in a Benchmark Project that will provide the basis for the detailed design of NBRWTP improvements by a suitable design team to be selected at a later time. The facilities planning will def ine and evaluate a potential capacity phasing for meeting near - and long-term capacity needs and will include a planning level cost estimate. The Facilities Plan will be based on the findings and conclusions of the May 24, 2024 technical memorandum (TM) titled “NBRWTP Condition Assessment, Performance Evaluation, and Expansion Analysis” (May 2024 NBRWTP TM), supplemented as described below. The key subtasks to be performed under Task 5 include:
• Task 5.1. Raw and Treated Water Quality Characterization • Task 5.2. Existing Facilities Description
• Task 5.3. Need for Project
• Task 5.4. Treatment Performance and Technology Goals
• Task 5.5. Benchmark Project Development
• Task 5.6. Project Implementation and Schedule
• Task 5.7. Cost Estimates
• Task 5.8. Benchmark Design Report

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
8 City of Fairfield
City of Vacaville

Task 5.1. Raw and Treated Water Quality Characterization West Yost will update historical raw and treated water quality characterizations prepared as part of Fairfield’s recent Public Utilities Master Plan (PUMP), which included available data from 2018 to 2022.

More recent data from 2022 through 2024, including parameters recorded as a result of data collection activities under Task 3, will be incorporated into the PUMP datasets and analyses. The intent of this task is to prepare a comprehensive set of relevant source water quality and plant performance data for use by a plant expansion design team.

Task 5.2. Existing Facilities Description
Descriptions of existing NBRWTP facilities from Fairfield’s recent PUMP will be updated and expanded, as appropriate, to provide additional background on the NBRWTP and its relationship with major treated drinking water infrastructure in Fairfield and Vacaville.

Task 5.3. Need for Project
West Yost will prepare a summary of the need for the proposed NBRWTP improvements, incorporating results from the PUMP (including condition-, capacity-, and performance-based drivers), as well as Tasks 3 and 4 from this scope of work. The principal changes to information previously developed as part of Fairfield’s PUMP will be an updated presentation of capacity -based improvement needs to reflect Vacaville’s capacity requirements, and to update discussion of performance -based improvements reflecting results from Tasks 3.3 and 3.4.

Task 5.4. Treatment Performance and Technology Goals
This task will focus on identifying and defining the Cities’ preferences and expectations for the characteristics and performance of an expanded and modified NBRWTP, including definition of acceptable treatment technologies and equipment. West Yost will le ad a workshop with representatives from both cities to identify and assess a range of technically feasible approaches to modifying and expanding the NBRWTP. A framework will be developed for screening options. Screening criteria may include (but are not limited to) constructability, capital and operating costs, treated water quality, operational flexibility, and ability to meet anticipated and/or potential changes to treated water quality regulations. A TM summarizing and documenting the Cities’ preferences and expectations will be prepared; the TM will serve as the basis for establishing relevant constraints and/or prescriptive requirements for incorporation into future project procurement documents. The purpose of this task is not to confine the future des ign to specific technologies, but rather to identify any constraints that the Cities desire to imposed on the future design.

Task 5.5. Benchmark Project Development
The purpose of the Benchmark Project will be to identify and define one approach to satisfying the Cities’ needs for improvements to the NBRWTP and related offsite infrastructure that would be included in a combined project. The Benchmark Project will establish the type, size, configuration, and performance of key project elements that the Cities’ believe would achieve the project’s capacity and performance requirements, and will serve as the basis for estimated capital and operating costs for the improved facilities. Where appropriate, the Benchmark Project is anticipated to include a degree of conservatism in terms of design criteria, operational complexity, cost, and site planning.

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
9 City of Fairfield
City of Vacaville

West Yost will lead a joint Project Scoping Workshop to identify which offsite infrastructure projects will be included in a combined project with the NBRWTP improvements, and which offsite project will proceed in parallel as separate projects. The scope of offsite projects to be considered for Vacaville will be based on findings developed under Task 4. The scope of offsite projects to be considered for Fairfield (if any) will be based on the PUMP with input from City staff.

Development of the Benchmark Project will include updates and refinements to facility -specific discussions in Fairfield’s PUMP, modified to reflect the results of Task 3, Task 4, and Task 5.4 of this scope of work. Design criteria will be presented in suff icient detail to communicate the Cities’ performance expectations and preferences, and to provide a basis for evaluation of future proposals for design and construction of the improvements.

Key deliverables prepared under this subtask will include design criteria tables and conceptual site plans for the NBRWTP and selected offsite improvements, including conceptual pipeline alignments.

Task 5.6. Project Implementation and Schedule
The objectives of this task will be to identify and characterize – in sufficient detail for planning purposes – the types, sequencing, and durations of the various steps necessary to implement the project. West Yost will work with the Cities to outline req uirements for environmental documentation and permitting, non - environmental permitting, land acquisition, procurement document development, bid/proposal evaluation, design and construction, facility startup and commissioning, and project closeout. A project schedule will be developed with appropriate durations, relationships, and sequencing of key activities.

Environmental consultant input may be warranted during this subtask, and may be added to the scope and budget if determined to be necessary.

Task 5.7. Cost Estimates
Capital and operating cost estimates will be developed for the Benchmark Project, as well as the supporting engineering, environmental, land acquisition, legal, other administrative activities necessary to support the project. Construction costs will rely primarily on parametric estimating tools incorporating actual facility cost data from recently constructed projects, and will be supported where necessary with more focused, quantity-based estimates for certain facilities. Operating costs will rely on the estimated power, chemical, labor, and equipment replacement and repair needs associated with the Benchmark Project. A 20- to 30-year lifecycle cost analysis will be prepared to combine capital and operating costs.

Task 5.8. Benchmark Design Report
Based on the May 2024 NBRWTP TM, depending on the updated capacity and phasing plan, treatment improvements are expected to include intake screening, ozonation facilities, flash mixing, pretreatment trains (i.e., flocculation/sedimentation basins), dual me dia filters, washwater equalization basins, washwater clarifiers, and sludge lagoons. Other onsite improvements include yard piping, electrical improvements, pumping and metering facilities, and chemical storage. Offsite improvements may include treated water transmission, blending, storage and pumping facilities. The capacity and phasing options will be based on those presented in the May 2024 NBRWTP TM and one of the options will be refined based on discussions with the staff of both Cities. The improveme nt and options defined in Tasks 5.1 through 5.4 will serve as the basis for preliminary site layouts showing the expanded NBRWTP.

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
10 City of Fairfield
City of Vacaville

The likely CEQA documentation and actions will be identified, and will affect both the costs and schedule for improvements. Similarly, an assessment of environmental permits and non -environmental permits (e.g., encroachment permits) will be performed. Additionally, potential property purchases an d/or easement acquisitions will be identified.

Upon completion of Tasks 5.1 through 5.7, all of the activities under Task 5 will be documented in a Benchmark Project Report that will be submitted to the appropriate staff from both Cities for review and comment.

Task 5 Assumptions
• Three meetings with the staff of both Cities to discuss improvements, options, layouts, criteria, costs, and schedule
• Hydraulic evaluations (if needed) to further define offsite improvements for Fairfield would be performed under separate contract, or under an added scope and budget for this task • Meetings with environmental and/or regional water agencies will be identified but are not included in this scope
• One meeting to discuss land/easement acquisition
• One meeting to review/discuss the Benchmark Project Report • Evaluation of North Bay Aqueduct and Putah South Canal conveyance capacity will be evaluated under an added scope item, if necessary
• The scope and design criteria for any Project elements addressing repair and rehabilitation needs will be specified by City staff and incorporated in the Benchmark Project Report.

Task 5 Deliverables
• Preliminary NBRWTP site layouts
• NBRWTP design criteria and performance goals (TM or Draft report section) • Offsite facility design criteria summary
• Preliminary cost and schedule summaries
• Draft and final Benchmark Project Report
• Agendas and summary notes for each meeting and workshop TASK 6. OUTSIDE FUNDING
Several potential funding mechanisms exist to support the expansion of the NBRWTP. Funding is expected to include some combination of water rates, connection fees, low-interest loans, and/or state and federal grants. Rate studies will be performed independently by both Cities, and it is assumed that a financing plan will be developed by others, as needed to support the internal funding strategy.

The focus of this task will be on the identification of loan and grant funding options available to support the NBRWTP expansion. If warranted, future scope and budget authorizations may include assistance in preparing funding applications, construction labor compliance monitoring, grant/loan administration, and reporting. The initial key subtasks include:
• Task 6.1. Funding Research
• Task 6.2. Meetings with Funding Agencies
• Task 6.3. Funding Strategy TM
• Task 6.4. Ongoing Opportunity Monitoring

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
11 City of Fairfield
City of Vacaville

Potential funding sources available for this project include:
• Federal Funding Programs
— U.S. Bureau of Reclamation WaterSMART Drought Response Program for Drought Resiliency Projects: Funding can be up to $3,000,000 per project, with a 50 percent cost share
— U.S. Bureau of Reclamation WaterSMART Planning and Project Design Program. Per project funding can be up to $400,000 with a 50 percent cost share — Federal Emergency Management Agency (FEMA) Hazard Mitigation Grant Program.

Maximum per project funding is not specified but awards are often in the tens of millions of dollars per project with a 25 percent cost share — U.S. Environmental Protection Agency (USEPA) Midsize and Large Drinking Water System Infrastructure Resilience and Sustainability Grant. Per project funding can be up to $5 million with a 10 percent cost share
• State Funding Programs
— Safe Drinking Water State Revolving Fund (SRF) loan program: Offers interest rates at less than half the municipal bond rate
— California Infrastructure Bank (I-Bank): Program funding is available in amounts ranging from $50,000 to $25,000,000, with loan terms of up to 30 years — Additional state funding program may become available in FY25/26 if the Safe Drinking Water, Wildfire Prevention, Drought Preparedness, and Clean Air Bond Act of 2024 (otherwise known as the Proposition 4 California Climate Bond) is passed by voters in November 2024. This bond proposes to allocate $3.8 billion to water projects The scope for Task 6 will involve investigating and tracking the status of available outside funding sources, meeting with relevant funding agencies, and documenting the efforts and findings in a TM. Ongoing monitoring and maintaining an up-to-date list of opportunities is also proposed.

Task 6 Assumptions
• One meeting with Fairfield and Vacaville staff to discuss potential available funding options • Three meetings with funding agencies
• Periodic meetings to review updates to the list of opportunities (Funding Opportunity Matrix or tracking spreadsheet) will be held in conjunction with routine project team meetings • A Financing Plan will be developed separately by others

Task 6 Deliverables
• Agendas and summary notes for each meeting
• Funding Opportunity Matrix or tracking spreadsheet
• Draft and final funding strategy TM
TASK 7. PROJECT DELIVERY METHOD EVALUATION
A variety of project delivery methods may be available for the NBRWTP expansion and related offsite projects, including traditional design-bid-build as well as collaborative project delivery methods such as progressive design-build. Key subtasks include:

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
12 City of Fairfield
City of Vacaville

• Task 7.1. Consultations with Staff and Legal Counsels of Both Cities • Task 7.2. Project Delivery Methods TM
• Task 7.3. Presentations to City Councils
One meeting with the staff of both Cities, and another one that includes legal counsels will be conducted to review and compare options, discuss needs and constraints, and develop a preferred delivery method.

In the initial meeting, West Yost will present a summary of the pros and cons of each available project delivery method as it relates specifically to this project. The information will be summarized and presented in a brief draft TM for presentation to both City Councils with a recommended approach bas ed on the staff discussions. The TM will then be finalized based on feedback from the City Councils.

Task 7 Assumptions
• One meeting with Fairfield and Vacaville staff and a second that includes legal counsels to discuss available/preferred project delivery methods
• Two presentations (one each) to City Councils

Task 7 Deliverables
• Agendas and summary notes for each meeting
• Presentation slides for delivery to City Councils
• Draft and final project delivery recommendations TM
TASK 8. BUSINESS CASE DOCUMENTATION
Upon completion of Tasks 3 through 7, West Yost will develop a business case document. The document will be useful to both Cities in presenting to their respective City management and councils regarding the need for the NBRWTP expansion and the participation of both Cities. Key subtasks to be performed under Task 8 include:
• Task 8.1. Business Case Report
• Task 8.2. City Council Presentations/Hearings
The Business Case Report will describe the key drivers behind the need for NBRWTP expansion and will rely heavily on the work products completed under the previous tasks. Key drivers include water quality concerns (especially emerging contaminants, such as chromium-VI and PFAS), future demand projections, and the need for water supply diversity. The report will also summarize the need for an updated JPA, the extent of facilities required for NBRWTP expansion, preliminary costs and schedule information, environmental and permitting steps, and the funding strategy. All relevant materials will be presented at City Council sessions/hearings for both Cities.

Task 8 Assumptions
• Two City Council meetings/hearings (one for each City) • A formal economic justification will not be required, given the nature of the project drivers • Planning level costs with ample contingencies will be presented • The budget and scope for this task will be reviewed and updated (if necessary) as the project is further defined

Task 8 Deliverables

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
13 City of Fairfield
City of Vacaville

• Agendas and summary notes for each meeting/hearing
• Draft and final Business Case Report
• Presentation materials for City Council meetings/hearings TASK 9. PROJECT MANAGEMENT AND PROGRAM COORDINATION
West Yost will serve as an advisor and program manager for both Cities from now through completion of construction. In this role, West Yost will guide the Cities through multiple aspects of the program, coordinating the combined efforts to advance the Project. This task is initially authorized through June 2026, and is expected to be extended and adapted as the Project and program management needs are further defined. Accordingly, the initial budget for Task 9 is based on an assumed level of effort that wil l be affected by many outside factors. The allocation of budget to program management activities under this task will be monitored and adjusted collaboratively with the Cities’ project manager.

Key subtasks to be performed under Task 9 include:
• Task 9.1. Program Management Plan (PMP)
• Task 9.2. Program Budgeting and Cashflow Projections
• Task 9.3. Program Schedule
• Task 9.4. Progress Monitoring and Invoicing
The subtasks are further described as follows.

Task 9.1. Program Management Plan (PMP)
The PMP will describe the processes and controls necessary to successfully execute the Project, and will be revised and updated as the Project proceeds. Accordingly, the PMP will address the roles and responsibilities of each Project team member, the project controls needed to manage various aspects of the program (such as document management, scheduling, change management, accounting, and budgeting), and the quality assurance/quality control (QA/QC) procedures to be followed.

Task 9.2. Program Budgeting and Cashflow Projections
Program budgeting will involve cost projections in both summary and line -item form for all elements of the Project. Updates will be performed at least semi -annually, and the task/line -item structure will be adapted as the Project progresses and the budget is refined over time. Annual cash flow projections will be maintained as part of the budgeting process.

Task 9.3. Program Schedule
A detailed Program schedule will be maintained, with updates on an as -needed basis, approximately quarterly. In the future, the Program schedule will incorporate or reference design and construction schedules developed by the entity(ies) selected to design and construct the facilities.

Task 9.4. Progress Monitoring and Invoicing
Biweekly virtual meetings with the Project Manager(s) for the Cities will be held to review Project progress, action items, critical path items, and upcoming meetings or decisions needed. West Yost will use a Project SharePoint site to post relevant inform ation and documents, including the Action Item Log

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
14 City of Fairfield
City of Vacaville

and Decision Log. Monthly invoices will be prepared that include a summary of the work completed under each task.

Task 9.5 Program Technical Team Meetings
Program technical team meetings will be held at least bi-monthly to make decisions and keep senior staff informed. These meetings will be an important tool for building and maintaining project momentum.

Monthly technical team meetings are planned for the first seven months of the program.

TASK 10. AS-NEEDED SERVICES
Services may be added to this scope of work based on project needs, for example:

Potential activities that may be initiated within the time frame of this initial scope of work, before the end of FY 25/26:
• Collaborative Delivery Procurement Document Development • Communications (Presentations, Management Briefings)
• Public Outreach
• SCADA Assessment and Implementation / Programming
• Cyber-Informed Engineering Review
• Specialty Subconsulting, including but not limited to:
— Environmental
— Financial Planning
— Surveying
— Right-of-Way / Property Acquisition
Potential activities beyond FY 25/26:
• Collaborative Delivery Contract Oversight
• Design Review
• Construction Monitoring
• Senate Bill 991 Reporting
A budget allowance is included for Task 10; however, a specific scope of work and associated budget will be agreed to and authorized by the Cities prior to performing services under this task or new tasks.

GENERAL ASSUMPTIONS
• The Project will include the first phase of expansion at the NBR • The Project will include some offsite transmission facilities to connect to Vacaville’s distribution system, and possibly blending facilities
• The Project may include some offsite facilities (prior to distribution system connection) for Fairfield

Initial Scope of Services (FY 24/25 and FY 25/26)
NBRWTP Expansion Program Management

N-M-C—FAIRFIELD-LP-2024 NBRWTP EXP PRO MANAGER
15 City of Fairfield
City of Vacaville

• Some data collection and analysis is needed to better define the Project. The Cities will collect and West Yost will evaluate raw data as time allows without unnecessarily delaying start of design
• Program Management: In addition to the Project encompassing the NBRWTP expansion plus any combined offsite improvements, West Yost will assist with monitoring, coordinating and performing tasks associated with other related activities and projects, including other capital projects
• West Yost’s scope and budget will be adapted to fit the needs of the Cities over the course of the program.
• The initial scope and budget authorization generally includes work that precedes preparation of project procurement documents; however, preparation of procurement documents could be initiated before the end of FY 25/26 if authorized as an additional task. • Environmental review (CEQA/NEPA) and permitting may be added under West Yost’s contract, but is not initially included
• Legal counsel will be provide through the Cities’ legal departments, including (if needed) outside specialty counsel for collaborative delivery contracting

UNKNOWNS POTENTIALLY AFFECTING SCOPE, SCHEDULE AND/OR BUDGET The following list identifies some of the unknowns that could change the schedule and budget:
• Environmental review (CEQA/NEPA) requirements for offsite facilities • Environmental review (CEQA/NEPA) requirements for treatment (onsite) facilities • Extent of offsite facilities needed
• The mix of offsite improvements to be included in the main Project contract vs. separate projects/contracts
• Design and construction procurement method(s) to be selected for each element of the Project
• Property acquisition needed for offsite facilities
• Number of alternatives and/or phases to be considered • Level of prescriptiveness included in Benchmark Design Report, which could affect the amount of analysis needed before design begins

LSA Scope of Services

Attachment C

Attachment 3 – LSA Scope of Services

This document includes the original (8.14.25) and the amended (12.19.25) scope of services for environmental support for the Fairfield-Vacaville Water Works Project.

8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP\North Bay Regional Water Treatment Plant Expansion_08.14.25.docx)

CARLSBAD
CLOVIS
IRVINE

LOS ANGELES

PALM SPRINGS

POINT RICHMOND

RIVERSIDE

ROSEVILLE

SAN LUIS OBISPO
860 Walnut Street, Suite B, San Luis Obispo, California 93401 805.782.0745 www.lsa.net

August 14, 2025
Jeff Pelz, Vice President
West Yost
2020 Research Park Drive. Suite 100
Davis, California 95618

Subject: North Bay Regional Water Treatment Plant Expansion and Pipeline Project Environmental Planning Support Services
Dear Mr. Pelz:

Thank you for the opportunity to assist you with the North Bay Regional Water Treatment Plant Expansion and Pipeline Project (Project). LSA will provide environmental planning services to support the development and environmental clearance of the North Bay Regional Water Treatment Plant Expansion and Pipeline Project (Project) in coordination with West Yost. The scope of work includes project mobilization, technical studies, environmental documentation under CEQA (and NEPA, if required), coordination to support the pipeline alignment study, and federal and State permitting. Optional services are also provided for NEPA compliance, additional cultural resource needs, and full MND or EIR preparation.

This proposal is divided into two phases. The first phase consists of preliminary assessment and the second phase consists of completion of CEQA (and NEPA, if required). The second phase is presented as a preliminary estimate and will be revised to reflect a more accurate scope and budget once the full Project details are confirmed.

PHASE 1: PRELIMINARY ASSESSMENT ASSISTANCE
Task 1.1: Project Mobilization and Background Review
This task includes time and budget for mobilization and background research efforts. LSA will coordinate with the project team, review existing documents, and gather relevant data to support West Yost’s technical efforts in determining treatment plant expansion and pipeline alignment.

Activities include:
• Internal meetings and schedule development
• Review of existing environmental documents, plans, and project information • Identify potential issues or constraints
• Coordination and information sharing with West Yost and the project team to understand project scope and objectives
2 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) • Preparation of a refined/revised work plan and proposal for Phase 2 • Evaluate whether CEQA tiering can be applied using existing Specific Plan environmental documents. LSA will review relevant CEQA documents and identify opportunities to streamline the environmental review process, with the goal of reducing costs and maintaining schedule efficiency.

Task 1.2: Support for Treatment Plant Expansion and Pipeline Alignment Study LSA will assist West Yost by identifying potential environmental constraints and considerations for alternative pipeline alignments and expansion needs at the existing treatment facility. This will include:
• LSA to share relevant geospatial data compiled from previous City of Fairfield project within the Project vicinity including, but not limited to, sensitive habitat delineated information, environmental data, and GIS data
• Preliminary fatal flaw screening of alternatives
• Participation in pipeline alignment workshops or meetings Task 1.3: Project Management and Coordination
Project Management will include the oversight of all LSA staff working on the Project and will be responsible for managing the day-to-day activities associated with the Project. Responsibilities include regular coordination with West Yost staff, contract management, oversight of the Project team, schedule coordination, and development of work products.

PHASE 2: EXECUTION OF PROPOSED PROJECT
For planning purposes, the scope and budget provided for Phase 2 are preliminary estimates only and will be refined as the full Project scope and requirements are further defined.

Task 2.1: Technical Studies to Support CEQA/NEPA
LSA will prepare the necessary technical studies to support CEQA compliance and NEPA compliance with Section 7 and 106. Anticipated studies include:

Task 2.1.1 Biological Evaluation
LSA will prepare a Biological Resource Assessment (BRA) report including a summary of the results of the literature review, biological resources survey, and an assessment of whether focused surveys are needed. The following details the scope of work.
• Review of relevant background information, including but not limited to California Natural Diversity Database, the California Native Plant Society’s Inventory of Rare and Endangered Vascular Plants of California, United States Fish and Wildlife Service’s (USFWS’s) Information, 3 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) Planning, and Conservation (IPaC) System, technical reports regarding flora and fauna with potential to occur near the Project areas, and other planning documents completed for projects within the region that have potential relevance to the Project area. • Perform a reconnaissance-level field survey. Goals of the biological field survey include identification of existing biological resources within the Project area, including land uses and biotic habitats, constituent plants and animals, and suitable habitat for special status species. • Prepare a Biological Evaluation memorandum evaluating potential project impacts to State and federally listed or special status species, habitats, and other sensitive biological resources and include NEPA Section 7 consultation analysis to assist with federal grant compliance needs. The memo will also provide avoidance and minimization measures to assist design and provide possible mitigation reductions, where possible. This estimate includes one set of comments from the client and one round of minor comments from the City (requiring a total of 8 hours or less) in response to the Draft Report.

Task 2.1.2 Cultural Resources Study
LSA proposes to conduct an archaeological and architectural inventory, including a Class III intensive pedestrian survey and a cultural resources inventory report summarizing the results of the study, to assist in compliance requirements set for the by the City of Fairfield as lead agency. LSA will complete the report in accordance with the Secretary of the Interior’s Standards and Guidelines for Archaeology and Historic Preservation (48 FR 44716, September 29, 1983) and the California Office of Historic Preservation (OHP). The cultural resources inventory report is a summary document used by the applicant as a consultation and decision-making document. The preparation of the report includes the following tasks as necessary components, and the results of these tasks will be summarized in the report:
• GIS Mapping. LSA will develop project area mapping in consultation with the owner/ representative that depicts location, vicinity, project area footprint, records search, and ethnographic maps. The project area, developed in coordination with the applicant, is defined as the area within which a project may directly or indirectly cause changes in the character or use of historic properties, should any be present. For historic architectural resources, indirect changes (such as visual or vibratory effects) may occur in parcels adjacent to the proposed project area.
• Record Search/Research. LSA will conduct a records search of the project area and surrounding

0.5-mile radius through the Northwest Information Center (NWIC) of the California Historical Resources Information System (CHRIS) housed at California State University, Sonoma. The purpose of this records search is to obtain and review archaeological reports and cultural resources previously recorded within the project area and 0.5-mi buffer, to inform assessments of built environment and other cultural resources that may be at risk of adverse effects as a result of proposed project activities. LSA will also consult other sources, including historic-period 4 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) maps and aerial photographs, to inform land use patterns and the site’s sensitivity for surface and subsurface archaeological cultural resources within the project area. • Pedestrian Survey. After receiving the records search results, an LSA archaeologist will conduct a cultural resource inventory of the project area. This cultural resource inventory will be implemented as a Class III intensive pedestrian survey of the project area, in accordance with the Secretary of the Interior’s (SOI) Standards and Guidelines for Archaeology and Historic Preservation (48 FR 44716, September 29, 1983). Fieldwork will be directed and documented by an LSA archaeologist individually meeting the SOI Professional Qualifications Standards (36 CFR 61 and 48 FR 44716) for archaeology and an archaeologist crew member supervised by the SOI- Professionally Qualified archaeologist. As there is currently no specified project area footprint, this scope assumes the pedestrian survey will take place on an approximately 148-acre area containing and immediately surrounding the North Bay Regional Water Treatment Plant (NBRWTP) facility in Solano County, California. Any necessitated increase in survey area will require a contract amendment and a schedule adjustment may be necessary. • Cultural Resources Inventory Report. Upon completion of the preceding tasks, LSA will prepare a Draft and Final Cultural Resources Inventory Report. The report will include the natural context and historic and ethnographic contexts pertaining to the project region, along with a records search and literature review, Tribal consultation summaries if applicable, field methodologies, survey results, anticipated negative findings (see below), and recommendations for cultural resource management strategies (if applicable). This estimate includes one set of comments from the client and one round of minor comments from the City (requiring a total of 8 hours or less) in response to the Draft Report.

Task 2.1.3 Air Quality and Greenhouse Gas Emissions Analysis LSA will prepare an Air Quality and Greenhouse Gas Technical Memorandum for the proposed project in response to the Environmental Checklist questions. LSA will assess the proposed project’s impacts related to air quality and climate change (greenhouse gas [GHG] emissions). LSA will perform the analysis consistent with applicable City of Fairfield and the Bay Area Air District (Air District) procedures and requirements.

Construction activities associated with project development, including grading and ground disturbance, could increase concentrations of particular matter. This increase could contribute to existing air pollution and has the potential to exceed regional air emission thresholds established by the City of Fairfield and the Air District. The proposed project would also generate GHG emissions.

Typically, an individual project does not generate sufficient GHG emissions to influence climate change significantly on its own; therefore, the issue of climate change is cumulative in nature. The proposed project would generate GHG emissions that would cumulatively contribute to climate change.

Following the Air District guidelines, LSA will prepare a draft Air Quality and Greenhouse Gas Technical Memorandum to identify existing air quality conditions and potential air quality and greenhouse gas impacts resulting from the proposed project, by undertaking the following subtasks:
5 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) • Describe Existing Environmental Setting: LSA will provide a brief summary of information related to air quality and global climate change along with the climate/meteorological conditions in the project vicinity.
• Describe the Existing Regulatory Framework: The existing regulatory framework for air quality and global climate change will identify applicable federal, State, and City of Fairfield policies, regulations, and programs.
• Determine the Project's Consistency with Adopted Plans. LSA will review adopted plans related to clean air and the reduction of greenhouse gas emissions in the State of California, the Bay Area Air District, and the City of Fairfield, and determine the project's consistency with these plans.
• Assess Project Construction Emissions. Construction activities associated with the proposed project would generate increased particulate emissions associated with site preparation, grading, soil hauling, and other construction activities on the project site. Construction equipment exhaust would also be a known source of air pollution. LSA will calculate the regional construction emissions using the California Emissions Estimator Model version 2022.1 (CalEEMod).
• Assess Project Operation-Period Air Quality Impacts. Regional emissions of criteria air pollutants associated with long-term operations from vehicle trips will be calculated with CalEEMod. In addition, emissions associated with stationary sources, such as on-site energy consumption and landscaping equipment will be estimated. • Health Risk Assessment: Based on the project location and nearby sensitive receptors, LSA will prepare a construction health risk assessment (HRA) that will summarize cancer risk and non- cancer risk (chronic and acute) and will compare the results of the HRA with the SJVAPCD’s recommended thresholds. Supporting modeling and technical information for the HRA will be attached to the memorandum as an appendix.
• Assess Project Greenhouse Gas Emissions. LSA will qualitatively evaluate the project’s impact on greenhouse gas (GHG) emissions by providing an assessment of greenhouse gas thresholds identified in the Bay Area Air District’s 2022 CEQA Guidelines. Consistent with the Air District’s CEQA Guidelines and State CEQA Guidelines Section 15183.5, if a project is consistent with an adopted qualified Greenhouse Gas Reduction Strategy that meets the standards, it can be presumed that the project would not have a significant greenhouse gas emission impact. The City’s Climate Action Plan (CAP) meets the requirements for a qualified Greenhouse Gas Reduction Strategy. As such, LSA will evaluate whether the proposed project would be consistent with the City’s CAP. LSA will also recommend mitigation measures to be consistent with the CAP, as necessary.
• Identify Mitigation Measures: LSA will identify, where necessary, practical mitigation measures to address any significant project or cumulative impacts. Measures established by the Air District 6 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) for dust suppression will be identified to reduce construction impacts. Mitigation measures designed to reduce the project's short-term construction and long-term air quality and GHG impacts to the extent feasible will be identified, if needed. Both an evaluation of the potential mitigation measures and a discussion of their effectiveness will be provided. • Prepare Memorandum. LSA will submit one digital copy of the draft Memorandum to the project team for review. Based on one set of comments, LSA will prepare a final Memorandum.

This estimate includes one set of comments from the client and one round of minor comments from the City (requiring a total of 8 hours or less) in response to the Draft Report.

LSA will submit a digital copy of the draft Air Quality and Greenhouse Gas Technical Memorandum to the project applicant for review. Based on one set of consolidated comments, LSA will prepare a final Air Quality and Greenhouse Gas Technical Memorandum, to be delivered to the project applicant in PDF Format.

Task 2.1.4 Noise Impact Analysis
LSA will prepare a noise and vibration analysis for the project in response to the Environmental Checklist questions in Appendix G of the State CEQA Guidelines. LSA will prepare a technical noise and vibration impact analysis consistent with all applicable local jurisdiction procedures and requirements as well as applicable vibration standards identified by the California Department of Transportation (Caltrans) and the Federal Transit Administration (FTA). The Noise and Vibration Impact Analysis will be completed by undertaking the following subtasks:
• Applicable Standards and Existing Environment: LSA will prepare a technical noise and vibration impact analysis consistent with all applicable City procedures and requirements and applicable vibration standards identified by the California Department of Transportation (Caltrans) and the Federal Transit Administration (FTA). LSA will analyze the potential noise and vibration impacts compared to the Cities of Fairfield and Vacaville Noise Elements and Municipal Code Noise Ordinance criteria, as applicable.

LSA will conduct up to two long-term ambient noise level measurements within the project area.

The long-term ambient noise level will be documented for 24 hours. These ambient noise levels will be used to assess the existing ambient noise environment in the project vicinity. • Construction Noise Impact Analysis: LSA will analyze the short -term construction noise and vibration impacts on adjacent noise-sensitive uses. Construction would occur during implementation of the project. Noise impacts from construction sources will be analyzed based on the equipment expected to be used, the length of a specific construction task, the equipment power type (gasoline or diesel engine), horsepower, load factor, and the percentage of time in use. FTA-recommended or industry -recognized empirical noise emission levels will be used for the construction equipment. The construction noise impact will be evaluated in terms of maximum levels (L
max), and the frequency of occurrence at adjacent sensitive locations. Analysis requirements will be based on the sensitivity of the area and the Cities’ criteria. Noise abatement 7 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) measures designed to reduce short-term impacts to acceptable noise levels in the vicinity of the project site will be determined where necessary.
• Construction Vibration Impact Analysis: Vibration impacts from construction sources will be analyzed based on the equipment expected to be used. The FTA -recommended equipment vibration levels will be used for the construction equipment expected to be used. The construction vibration impact will be evaluated in terms of peak particle velocity (PPV, or inches per second [in/sec]) and the vibration decibel levels for building damage and human annoyance, respectively.

Analysis requirements will be provided based on the sensitivity of the ar ea directly adjacent to the project site.

• Off-site Stationary Noise Analysis : Long-term noise impacts associated with the proposed equipment will be evaluated. The City and County noise criteria for stationary sources will be used to assess potential stationary source noise impacts. Using the project site plan, LSA will determine future stationary sources noise impacts from proposed project incorporating equipment noise specifications from the manufacturers or published noise levels from similar equipment.

• Mitigation Measures: If necessary, LSA will determine temporary construction-related noise and vibration reduction features which can be incorporated into the project plans, designed to reduce short-term construction noise and vibration impacts, as well as long-term operational impacts. • Noise and Vibration Report: LSA will summarize the above findings in a draft technical report that will also include the settings and regulatory requirements. LSA Noise Staff will respond to one round of consolidated comments from the client and Cities after which a Final Noise and Vibration Impact Analysis memorandum will be provided. This estimate includes one set of comments from the client and one round of minor comments from the City (requiring a total of 8 hours or less) in response to the Draft Report.

Task 2.1.5 Water Quality and Hydrology Technical Memorandum.

LSA will prepare a Hydrology and Water Quality Report that evaluates project-related and cumulative impacts to water quality, groundwater, hydrology, and floodplains. • The Hydrology and Water Quality Report: LSA will prepare a report that includes a discussion of the existing setting, applicable federal, State, regional and local regulations, and applicable CEQA significance thresholds related to hydrology and water quality. The impact analysis will include a qualitative response to each of the CEQA thresholds in Appendix G of the State CEQA Guidelines. LSA will evaluate the need for best management practices (BMPs) to ensure compliance with federal, State, and local National Pollutant Discharge Elimination System (NPDES) permit requirements and local ordinances during construction and operation. However, because the analysis is at a programmatic level, the Hydrology and Water Quality Report will not specify specific construction, source control, site design, low impact development, design pollution prevention, or treatment control Best Management Practices (BMPs) or drainage improvements. This estimate includes one set of comments from the client and one round of 8 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) minor comments from the City (requiring a total of 8 hours or less) in response to the Draft Report.

Task 2.2: Initial Study and CEQA Determination
LSA will prepare an Initial Study (IS) consistent with Appendix G of the CEQA Guidelines. The IS will incorporate findings from the technical studies and determine whether a Mitigated Negative Declaration (MND) or Environmental Impact Report (EIR) is warranted. Supporting figures (e.g., project location, study area, site photographs, alignment concepts) will be prepared. This task includes:
• Technical Studies will be used to determine appropriate mitigation measures, as appropriate.
• Preparation of administrative and screencheck draft IS for review • CEQA determination recommendation memorandum
• Provide figures to support resource analysis to assist with environmental determinations • Final IS based on agency review and feedback
Deliverables
• Draft and Final Technical Studies (Biological, Cultural, Air Quality and GHGs, and Noise) • All figures (mapbook) to support environmental resource determinations • Draft CEQA Initial Study

Task 2.3: Permitting
Based on the final pipeline alignment, project description, and technical study findings, LSA will assist with identifying, preparing, and submitting permit applications and supporting documentation required for federal and state regulatory compliance. The Project area may cross multiple jurisdictional boundaries, including aquatic resources regulated by federal and State agencies. As such, the following permits and coordination are anticipated.

Task 2.3.1: Agency Permits
Based on potential impacts to jurisdictional waters, sensitive biological resources, and other regulated features, the following regulatory authorizations may be required:
• U.S. Army Corps of Engineers (USACE) – Nationwide Permit (NWP) under Section 404 of the Clean Water Act for discharges of dredged or fill material into waters of the U.S. (Aquatic Resources Delineation to support the permitting efforts is discuss in Task 2.3.2). • State Water Resources Control Board (SWRCB) – Clean Water Act Section 401 Water Quality Certification. Given that the Project spans two Regional Water Quality Control Board 9 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) (RWQCB) jurisdictions (San Francisco Bay and Central Valley/Sacramento), coordination with both boards will be required.
• California Department of Fish and Wildlife (CDFW) – Lake and Streambed Alteration Agreement (LSAA) under Section 1600 et seq. of the California Fish and Game Code for activities affecting the bed, bank, or channel of a stream or associated riparian habitat. A Section 2081 of the California Fish and Game Code Incidental Take Permit for effects to state listed threatened and endangered species.
• US Fish and Wildlife Service (USFWS) – Incidental take authorized under either a Section 7 consultation through the USACE permit process or Section 10 Habitat Conservation Plan.

LSA will assist in preparing draft permit applications, including required maps, technical reports, and attachments. Once reviewed and approved by the Cities, LSA will finalize and submit the applications on their behalf.

Task 2.3.2: Supporting Documentation
• Aquatic Resources Delineation. An Aquatic Resources Delineation Report (ARDR) will be prepared in accordance with the USACE Minimum Standards for Acceptance of Aquatic Resources Delineation Reports, dated January 2016 and the USACE Regulatory Guidance Letter 16-01 (October 2016) regarding Preliminary Jurisdictional Delineations. The report will include a description of the setting, a discussion of the methods and results, the completed wetland data forms, location and vicinity maps, and a preliminary delineation map showing the limits of all potential jurisdictional waters of the United States/State on the site.
• Alternatives Analysis. A narrative alternatives analysis will be prepared to support the Section 404 with USACE and Section 401 with SWRCB permitting processes. The analysis will describe the range of considered alternatives, including the preferred alignment, and provide justification for why the selected alternative represents the Least Environmentally Damaging Practicable Alternative (LEDPA) in accordance with Clean Water Act guidelines. • Initial Take Permit. If the Project has the potential to result in take of state-listed species, LSA will provide technical input to support preparation of an Incidental Take Permit (ITP) application to CDFW under the California Endangered Species Act (CESA), including relevant biological survey data, avoidance and minimization measures, and proposed mitigation. • Travis Air Force Base Coordination. Due to the proximity of the Project to Travis Air Force Base and the associated County’s Land Use Compatibility Plan (LUCP) restrictions regarding wildlife hazards, LSA will coordinate with the appropriate environmental and airspace compliance contacts at the base to ensure that the Project does not conflict with the LUCP precluded uses. Potential wildlife hazard compatibility issues include new settling ponds and construction of mitigation wetlands. A summary of coordination, correspondence, and any resulting conditions will be documented for inclusion in CEQA and permit filings. 10 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP)

Deliverables
• Draft and Final Permit Application Packages (USACE NWP, SWRCB 401 Certification, CDFW LSAA), including all appropriate figures to support the application and project • Aquatic Resources Delineation Report (ARDR) with maps and data forms • Alternatives Analysis Report (required for SWRCB permitting and possibly USACE depending on amount of wetland fill)
• Incidental Take Permit (ITP) supporting materials (if applicable) • Documentation of coordination with Travis Air Force Base

Task 2.2.3: Project Management and Coordination
Project Management will include the oversight of all LSA staff working on the Project and will be responsible for managing the day-to-day activities associated with the Project. Responsibilities include regular coordination with West Yost staff, contract management, oversight of the Project team, schedule coordination, and development of work products. Each month, the Project Manager will provide West Yost Project Manager with regular updates regarding the status of work and scheduled deliverables. The budget includes 2 one-hour meetings a month for 6 months following 1 one-hour meeting for an additional 6 months.

PHASE 2 – OPTIONAL OR AS NEEDED
Optional tasks, including NEPA compliance and preparation of a Mitigated Negative Declaration (MND) or Environmental Impact Report (EIR), are not included in this scope and will be addressed under a separate scope of work and budget once the Initial Study is complete and the appropriate level of CEQA/NEPA documentation is determined.

Optional Task A: NEPA Compliance for Federally Funded Projects If NEPA documentation is required due to federal funding or permitting, LSA will assist in preparation of the appropriate level of NEPA compliance documentation (e.g., Categorical Exclusion, Environmental Assessment). This task may include:
• Coordination with the grant funding federal lead agency • Preparation of cross-cutting federal environmental compliance documentation • If an Environmental Assessment is needed, an additional scope and budget will be provided.

Optional Task B: Mitigated Negative Declaration Preparation LSA will provide environmental planning services to support the development and environmental clearance of the North Bay Regional Water Treatment Plant Expansion and Pipeline Project. Based 11 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) on the completed CEQA Guidelines Appendix G Initial Study, the appropriate CEQA document has been determined to be a Mitigated Negative Declaration (MND). LSA will prepare the MND and provide all supporting services needed to ensure CEQA compliance and public circulation.

LSA will prepare the Draft IS/MND based on the completed Initial Study and available technical studies discussed above. The document will describe the Project, its environmental setting, the results of the environmental analysis, and the proposed mitigation measures to avoid or reduce impacts to less-than-significant levels.

The Draft IS/MND will be provided to the City of Fairfield and City of Vacaville staff for review in Administrative Draft form. Following one round of consolidated comments each, LSA will produce the Public Review Draft IS/MND.

The MND will be circulated for the full 30-day public review period. LSA will prepare the Notice of Intent (NOI) to adopt an MND, Notice of Completion (NOC), and State Clearinghouse Summary Form, and will submit the IS/MND and all associated documents electronically to the State Clearinghouse.

It is assumed that the City of Fairfield, as the CEQA Lead Agency, will be responsible for:
• Preparing and providing the agency and public distribution list • Publishing the NOI in a newspaper of general circulation • Provide the IS/MND on the City’s website for public review • Noticing adjacent and nearby property owners in accordance with CEQA requirements • File the NOI with the Solano County Clerk-Recorder
At the conclusion of the public review period, LSA will review all public and agency comments received on the Draft IS/MND and prepare written responses to up to three (3) comment letters.

Draft responses will be submitted to the City for review and approval. Should more than three substantive comment letters be received, or should additional technical studies be necessary, LSA may require a budget adjustment and written authorization to proceed.

If mitigation measures are identified in the IS/MND, LSA will prepare a Mitigation Monitoring and Reporting Program (MMRP) in accordance with CEQA Guidelines Section 15097. The MMRP will include mitigation measures in a matrix format to facilitate implementation and tracking. The MMRP will be included as an appendix to the Final IS/MND.

Based on the City’s review and approval of the draft Final IS/MND, LSA will prepare a Final IS/MND that incorporates the response to comments and MMRP. Upon project approval and adoption of the MMRP, LSA will prepare the Notice of Determination (NOD) and submit it electronically to the State Clearinghouse within five (5) days of its adoption.
12 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) It is assumed that the City will file the NOD with the Solano County Clerk-Recorder and will be responsible for paying the California Department of Fish and Wildlife (CDFW) environmental filing fee and any applicable county filing fees.

Deliverables
• Administrative Draft IS/MND (electronic format)
• Public Review Draft IS/MND (electronic format)
• NOI, NOC, and State Clearinghouse Summary Form
• Certified mail documentation and proof of notice
• Draft and Final Response to Comments
• Draft and Final MMRP
• Final IS/MND (with appendices)
• Draft Notice of Determination (NOD)
Optional Task C: EIR Preparation
LSA will provide environmental planning services to support the development and environmental clearance of the Project. Based on the outcome of the completed CEQA Guidelines Appendix G Initial Study, if the Project is found to have the potential to result in one or more significant environmental impacts that cannot be mitigated to less-than-significant levels, a Project-level Environmental Impact Report (EIR) will be prepared to comply with CEQA.

LSA will prepare a NOP and NOC, along with a full Draft EIR that includes a detailed Project Description, environmental setting, impact analysis, cumulative impacts, alternatives analysis, and feasible mitigation measures. The EIR will be prepared in accordance with the State CEQA Guidelines and will build upon the completed Initial Study and available technical studies.

An Administrative Draft EIR will be provided to the City of Fairfield and City of Vacaville for internal review and comment. Based on one round of consolidated City comments each, LSA will revise and produce a Public Review Draft EIR.

The Draft EIR will be circulated for a 45-day public review period. As part of this process, LSA will also prepare a Notice of Availability (NOA). These documents will be submitted electronically to the State Clearinghouse and distributed to the City’s list of responsible and trustee agencies, interested organizations, and members of the public.

It is assumed that the City of Fairfield, as the CEQA Lead Agency, will:
• Provide the mailing/distribution list
• Publish the NOA in a local newspaper of general circulation 13 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) • Notify adjacent and nearby property owners in accordance with CEQA Guidelines • Provide the EIR on the City’s website for public review • File the NOA with the Solano County Clerk-Recorder
At the conclusion of the public review period, LSA will review and prepare written responses to all public and agency comments received on the Draft EIR. The responses will be submitted to the City for review prior to finalization. A Final EIR will be prepared that includes the Draft EIR, written responses to comments, and any necessary text revisions. If substantial changes are made to the Draft EIR that warrant recirculation under CEQA Guidelines Section 15088.5, LSA will notify the City and provide a separate scope and budget for recirculation.

LSA will also prepare a MMRP pursuant to CEQA Guidelines Section 15097, which will include adopted mitigation measures in a matrix format to facilitate implementation and compliance tracking.

Following the City’s certification of the Final EIR and adoption of findings, mitigation measures, and the MMRP, LSA will prepare the NOD and submit it electronically to the State Clearinghouse. It is assumed that the City will file the NOD with the Solano County Clerk-Recorder and will be responsible for paying the California Department of Fish and Wildlife (CDFW) environmental filing fee and any applicable county filing fees.

Deliverables
• Administrative Draft EIR (electronic format)
• Public Review Draft EIR and Technical Appendices
• NOP, NOC, NOA, and State Clearinghouse Summary Form
• Proof of certified mailings and public notices
• Response to Comments Document
• Final EIR (including Draft EIR, comments, responses, and revisions) • Mitigation Monitoring and Reporting Program (MMRP)
• Notice of Determination (NOD)

Optional Task D: Native American Consultation Assistance At the request of the lead agency, LSA will request a record search of the Sacred Lands File (SLF) held by the Native American Heritage Commission (NAHC) for any information regarding cultural resources of traditional or cultural value to Tribal organizations located within the project area. In addition, LSA may draft and distribute AB 52 consultation letters via email (or USPS Certified Mail, if necessary) to Tribal contacts identified by the NAHC, and will conduct up to two rounds of follow-up 14 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) emails on behalf of the applicant if no responses are received. Should NEPA documentation be required due to federal funding or permitting, LSA will notify interested Tribal parties of project details for comment as part of the Section 106 consultation and maintain communications with Tribal parties. All correspondence with Tribal parties, including letters and emails, will be compiled in an administrative record and included as an attachment to the final report. This scope assumes no meetings with Tribal stakeholders.

In the event of positive archaeological findings, more than one set of comments requiring response, or other potential issues necessitating any substantive unanticipated effort and/or expenditure of budget (i.e., not within this scope of work or cost estimate), a contract amendment will be required.

ASSUMPTIONS
• This proposal does not include focused surveys, handling of special status species, or documentation beyond what has been described in this scope of work. If after the biological field survey, focused surveys are warranted, an additional scope and fee will be provided. • West Yost will provide all additional project details required for completion of the required permit applications beyond what is described in this proposal. • In the event of positive archaeological findings, more than one set of comments requiring response, or other potential issues necessitating any substantive unanticipated effort and/or expenditure of budget (i.e., not within this scope of work or cost estimate), a contract amendment will be required.
• This proposal does not include the preparation of a long-term routine maintenance Agreement or any other long-term maintenance permits.
• This proposal does not include mitigation and permitting fees which may be required by regulatory agencies. The client will pay all permits, notifications, and processing fees directly to each applicable agency.
• LSA has no influence on the timeliness of review or issuance of permits by outside agencies such as CDFW, USACE, SWRCB and RWQCB.
• The client will provide access to the site for field surveys. • All mitigation costs and fees will be paid by the client.

COST ESTIMATE
Table A. Cost Estimate
Task Cost Estimate
PHASE 1 - Preliminary Assessment
15 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) Table A. Cost Estimate
Task Cost Estimate
Project Mobilization, Background, and Pipeline Alignment Assistance $50,000 Subtotal $50,000
PHASE 2 – Execution of Proposed Project (to be updated once final project confirmed) Technical Studies
Biological Resources $14,100
Cultural Resources $15,500
Air Quality and Greenhouse Gases $11,500
Noise Assessment $10,100
Water Quality Assessment $6,550
California Environmental Quality Act
CEQA Initial Study $31,000
Subtotal $88,750
Agency Permitting
United States Army Corps of Engineers 404 Nationwide Permit $7,100 State Water Resources Control Board 401 Certification $12,850 California Department of Fish and Wildlife Streambed Alteration Agreement $17,000 Subtotal $36,950
Supporting Documentation
Aquatic Resources Delineation $8,250
Alternatives Analysis $20,300
Initial Take Permit (ITP) $14,900
Travis Airforce Base Coordination $7,100
Subtotal $50,550
Project Management
Project Management and Coordination Meetings $12,000
Reimbursables
Reimbursables (Record Search, Mileage, Lodging, Meals) $3,000 TOTAL COST $241,250

Table B. OPTIONAL Cost Estimate
Task Cost Estimate

OPTION A
NEPA Compliance $22,000

OPTION B
CEQA Mitigated Negative Declaration $34,000

OPTION C
CEQA Environmental Impact Report $115,000

OPTION D
Native American Consultation Assistance $5,300
TOTAL COST $176,300

THE ABOVE STATED TERMS ARE HEREBY ACCEPTED AND AUTHORIZED. 16 8/14/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) CONSULTANT: CLIENT:

LSA Associates, Inc. West Yost
Company Company

Authorized Signature Authorized Signature

Name Name

Title Title

Date Date

12/19/25 (\\aznasunifiler2\projects\2025\20252567.02_West Yost North Regional WTP\ADMIN\Proposal\North Bay Regional WTP Expansion Update_12.19.25.docx)

CARLSBAD
CLOVIS
IRVINE

LOS ANGELES

PALM SPRINGS

POINT RICHMOND

RIVERSIDE

ROSEVILLE

SAN LUIS OBISPO
860 Walnut Street, Suite B, San Luis Obispo, California 93401 805.782.0745 www.lsa.net

December 19, 2025
Jeff Pelz, Vice President
West Yost
2020 Research Park Drive. Suite 100
Davis, California 95618

Subject: North Bay Regional Water Treatment Plant Expansion and Pipeline Project Environmental Planning Support Services
Dear Mr. Pelz:

Thank you for the opportunity to assist you with the North Bay Regional Water Treatment Plant Expansion and Pipeline Project (Project). LSA will provide environmental planning services to support the development and environmental clearance of the North Bay Regional Water Treatment Plant Expansion and Pipeline Project (Project) in coordination with West Yost. The scope of work includes environmental documentation under CEQA (and NEPA, if required, technical studies, and federal and State permitting.

Note: This scope and budget builds upon the previously executed NTP for Phase 1: Preliminary Assessment Assistance (Tasks 1.1 and 1.2), and therefore starts at Phase 2.

PHASE 2: PROJECT MANAGEMENT
Task 2.1: Project Management and Coordination
Project Management will include the oversight of all LSA staff working on the Project and will be responsible for managing the day-to-day activities associated with the Project. Responsibilities include regular coordination with West Yost staff, contract management, oversight of the Project team, schedule coordination, and development of work products. Each month, the Project Manager will provide West Yost Project Manager with regular updates regarding the status of work and scheduled deliverables. The budget includes 2 one-hour meetings a month for 6 months following 1 one-hour meeting for an additional 6 months.

Task 2.2: Project Description
LSA will prepare a Project Description that includes a description of the Project site’s location and characteristics, background information, Project components, and the required City approvals. A location map and graphics illustrating the Project will also be developed based on materials provided by the Project Applicant. LSA will submit the draft Project description to City staff for review and comment and will subsequently prepare a final Project description for distribution to the LSA team technical specialists before initiating technical analyses.

2 12/19/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) PHASE 3: TECHNICAL STUDIES
LSA will prepare the necessary technical studies to support CEQA compliance and NEPA compliance with Section 7 and 106. Anticipated studies include:

Task 3.1 Biological Evaluation
LSA will prepare a Biological Resource Assessment (BRA) report including a summary of the results of the literature review, biological resources survey, and an assessment of whether focused surveys are needed. The following biological resources scope includes:
• Research. Review of relevant background information, including but not limited to California Natural Diversity Database, the California Native Plant Society’s Inventory of Rare and Endangered Vascular Plants of California, United States Fish and Wildlife Service’s (USFWS’s) Information, Planning, and Conservation (IPaC) System, technical reports regarding flora and fauna with potential to occur near the Project areas, and other planning documents completed for projects within the region that have potential relevance to the Project area.
• Reconnaissance-Level Survey. Perform a reconnaissance-level field survey. Goals of the biological field survey include identification of existing biological resources within the Project area, including land uses and biotic habitats, constituent plants and animals, and suitable habitat for special status species.
• Report. Prepare a Biological Evaluation memorandum evaluating potential project impacts to State and federally listed or special status species, habitats, and other sensitive biological resources and include NEPA Section 7 consultation analysis to assist with federal grant compliance needs. The memo will also provide avoidance and minimization measures to assist design and provide possible mitigation reductions, where possible. This estimate includes one set of comments from the client and one round of minor comments from the City (requiring a total of 8 hours or less) in response to the Draft Report. This document will be used to support CEQA and NEPA findings. • Focused Surveys. LSA will also conduct protocol level surveys for Contra Costa goldfields and Crotch’s bumble bee which we do not have direct information on presence or absence. Protocol surveys for Contra Costa goldfields will be conducted in April/May 2026 (depending on blooming conditions for nearby populations) and for Crotch’s bumblebee a minimum of three surveys between April through August 2026.
• Report. LSA will also prepare a supplemental survey report addressing Contra Costa goldfields and Crotch’s bumble bee protocol surveys. These studies and report will support permitting and preconstruction efforts.

Task 3.2 Cultural Resources Study
LSA proposes to conduct an archaeological and architectural inventory, including a Class III intensive pedestrian survey and a cultural resources inventory report summarizing the results of the study, to assist in compliance requirements set for the by the City of Fairfield as lead agency. LSA will complete the report in accordance with the Secretary of the Interior’s Standards and Guidelines for Archaeology and Historic Preservation (48 FR 44716, September 29, 1983) and the California Office of Historic 3 12/19/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) Preservation (OHP). The cultural resources inventory report is a summary document used by the applicant as a consultation and decision-making document. The preparation of the report includes the following tasks as necessary components, and the results of these tasks will be summarized in the report:
• GIS Mapping. LSA will develop project area mapping in consultation with the owner/ representative that depicts location, vicinity, project area footprint, records search, and ethnographic maps. The project area, developed in coordination with the applicant, is defined as the area within which a project may directly or indirectly cause changes in the character or use of historic properties, should any be present. For historic architectural resources, indirect changes (such as visual or vibratory effects) may occur in parcels adjacent to the proposed project area. • Record Search/Research. LSA will conduct a records search of the project area and surrounding 0.5- mile radius through the Northwest Information Center (NWIC) of the California Historical Resources Information System (CHRIS) housed at California State University, Sonoma. The purpose of this records search is to obtain and review archaeological reports and cultural resources previously recorded within the project area and 0.5-mi buffer, to inform assessments of built environment and other cultural resources that may be at risk of adverse effects as a result of proposed project activities. LSA will also consult other sources, including historic-period maps and aerial photographs, to inform land use patterns and the site’s sensitivity for surface and subsurface archaeological cultural resources within the project area.
• Pedestrian Survey. After receiving the records search results, an LSA archaeologist will conduct a cultural resource inventory of the project area. This cultural resource inventory will be implemented as a Class III intensive pedestrian survey of the project area, in accordance with the Secretary of the Interior’s (SOI) Standards and Guidelines for Archaeology and Historic Preservation (48 FR 44716, September 29, 1983). Fieldwork will be directed and documented by an LSA archaeologist individually meeting the SOI Professional Qualifications Standards (36 CFR 61 and 48 FR 44716) for archaeology and an archaeologist crew member supervised by the SOI-Professionally Qualified archaeologist. As there is currently no specified project area footprint, this scope assumes the pedestrian survey will take place on an approximately 148-acre area containing and immediately surrounding the North Bay Regional Water Treatment Plant (NBRWTP) facility in Solano County, California. Any necessitated increase in survey area will require a contract amendment and a schedule adjustment may be necessary.
• Cultural Resources Inventory Report. Upon completion of the preceding tasks, LSA will prepare a Draft and Final Cultural Resources Inventory Report. The report will include the natural context and historic and ethnographic contexts pertaining to the project region, along with a records search and literature review, Tribal consultation summaries if applicable, field methodologies, survey results, anticipated negative findings (see below), and recommendations for cultural resource management strategies (if applicable). This estimate includes one set of comments from the client and one round of minor comments from the City (requiring a total of 8 hours or less) in response to the Draft Report.

In the event of positive archaeological findings, more than one set of comments requiring response, or other potential issues necessitating any substantive unanticipated effort and/or expenditure of budget (i.e., not within this scope of work or cost estimate), a contract amendment will be required. 4 12/19/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) Task 3.3 Air Quality and Greenhouse Gas Emissions Analysis LSA will prepare an Air Quality and Greenhouse Gas Technical Memorandum for the proposed project in response to the Environmental Checklist questions. LSA will assess the proposed project’s impacts related to air quality and climate change (greenhouse gas [GHG] emissions). LSA will perform the analysis consistent with applicable City of Fairfield and the Bay Area Air District (Air District) procedures and requirements.

Construction activities associated with project development, including grading and ground disturbance, could increase concentrations of particular matter. This increase could contribute to existing air pollution and has the potential to exceed regional air emission thresholds established by the City of Fairfield and the Air District. The proposed project would also generate GHG emissions. Typically, an individual project does not generate sufficient GHG emissions to influence climate change significantly on its own; therefore, the issue of climate change is cumulative in nature. The proposed project would generate GHG emissions that would cumulatively contribute to climate change.

Following the Air District guidelines, LSA will prepare a draft Air Quality and Greenhouse Gas Technical Memorandum to identify existing air quality conditions and potential air quality and greenhouse gas impacts resulting from the proposed project, by undertaking the following subtasks:
• Describe Existing Environmental Setting: LSA will provide a brief summary of information related to air quality and global climate change along with the climate/meteorological conditions in the project vicinity.
• Describe the Existing Regulatory Framework: The existing regulatory framework for air quality and global climate change will identify applicable federal, State, and City of Fairfield policies, regulations, and programs.
• Determine the Project's Consistency with Adopted Plans. LSA will review adopted plans related to clean air and the reduction of greenhouse gas emissions in the State of California, the Bay Area Air District, and the City of Fairfield, and determine the project's consistency with these plans. • Assess Project Construction Emissions. Construction activities associated with the proposed project would generate increased particulate emissions associated with site preparation, grading, soil hauling, and other construction activities on the project site. Construction equipment exhaust would also be a known source of air pollution. LSA will calculate the regional construction emissions using the California Emissions Estimator Model version 2022.1 (CalEEMod). • Assess Project Operation-Period Air Quality Impacts. Regional emissions of criteria air pollutants associated with long-term operations from vehicle trips will be calculated with CalEEMod. In addition, emissions associated with stationary sources, such as on-site energy consumption and landscaping equipment will be estimated.
• Health Risk Assessment: Based on the project location and nearby sensitive receptors, LSA will prepare a construction health risk assessment (HRA) that will summarize cancer risk and non-cancer risk (chronic and acute) and will compare the results of the HRA with the SJVAPCD’s recommended thresholds. Supporting modeling and technical information for the HRA will be attached to the memorandum as an appendix.
5 12/19/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) • Assess Project Greenhouse Gas Emissions. LSA will qualitatively evaluate the project’s impact on greenhouse gas (GHG) emissions by providing an assessment of greenhouse gas thresholds identified in the Bay Area Air District’s 2022 CEQA Guidelines. Consistent with the Air District’s CEQA Guidelines and State CEQA Guidelines Section 15183.5, if a project is consistent with an adopted qualified Greenhouse Gas Reduction Strategy that meets the standards, it can be presumed that the project would not have a significant greenhouse gas emission impact. The City’s Climate Action Plan (CAP) meets the requirements for a qualified Greenhouse Gas Reduction Strategy. As such, LSA will evaluate whether the proposed project would be consistent with the City’s CAP. LSA will also recommend mitigation measures to be consistent with the CAP, as necessary. • Identify Mitigation Measures: LSA will identify, where necessary, practical mitigation measures to address any significant project or cumulative impacts. Measures established by the Air District for dust suppression will be identified to reduce construction impacts. Mitigation measures designed to reduce the project's short-term construction and long-term air quality and GHG impacts to the extent feasible will be identified, if needed. Both an evaluation of the potential mitigation measures and a discussion of their effectiveness will be provided. • Prepare Memorandum. LSA will submit one digital copy of the draft Memorandum to the project team for review. Based on one set of comments, LSA will prepare a final Memorandum. This estimate includes one set of comments from the client and one round of minor comments from the City (requiring a total of 8 hours or less) in response to the Draft Report.

LSA will submit a digital copy of the draft Air Quality and Greenhouse Gas Technical Memorandum to the project applicant for review. Based on one set of consolidated comments, LSA will prepare a final Air Quality and Greenhouse Gas Technical Memorandum, to be delivered to the project applicant in PDF Format.

Task 3.4: Noise Impact Analysis
LSA will prepare a noise and vibration analysis for the project in response to the Environmental Checklist questions in Appendix G of the State CEQA Guidelines. LSA will prepare a technical noise and vibration impact analysis consistent with all applicable local jurisdiction procedures and requirements as well as applicable vibration standards identified by the California Department of Transportation (Caltrans) and the Federal Transit Administration (FTA). The Noise and Vibration Impact Analysis will be completed by undertaking the following subtasks:
• Applicable Standards and Existing Environment: LSA will prepare a technical noise and vibration impact analysis consistent with all applicable City procedures and requirements and applicable vibration standards identified by the California Department of Transportation (Caltrans) and the Federal Transit Administration (FTA). LSA will analyze the potential noise and vibration impacts compared to the Cities of Fairfield and Vacaville Noise Elements and Municipal Code Noise Ordinance criteria, as applicable.

LSA will conduct up to two long-term ambient noise level measurements within the project area. The long-term ambient noise level will be documented for 24 hours. These ambient noise levels will be used to assess the existing ambient noise environment in the project vicinity. 6 12/19/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) • Construction Noise Impact Analysis: LSA will analyze the short-term construction noise and vibration impacts on adjacent noise -sensitive uses. Construction would occur during implementation of the project. Noise impacts from construction sources will be analyzed based on the equipment expect ed to be used, the length of a specific construction task, the equipment power type (gasoline or diesel engine), horsepower, load factor, and the percentage of time in use. FTA -recommended or industry- recognized empirica l noise emission levels will be used for the construction equipment. The construction noise impact will be evaluated in terms of maximum levels (L max), and the frequency of occurrence at adjacent sensitive locations. Analysis requirements will be based on the sensitivity of the area and the Cities’ criteria. Noise abatement measures designed to reduce short -term impacts to acceptable noise levels in the vicinity of the project site will be determined where necessary. • Construction Vibration Impact Analysis: Vibration impacts from construction sources will be analyzed based on the equipment expected to be used. The FTA-recommended equipment vibration levels will be used for the construction equipment expected to be used. The construction vibration impact will be evaluated in terms of peak particle velocity (PPV, or inches per second [in/sec]) and the vibration decibel levels for building damage and human annoyance, respectively. Analysis requirements will be provided based on the sensitivity of the area directly adjacent to the project site.

• Off-site Stationary Noise Analysis: Long-term noise impacts associated with the proposed equipment will be evaluated. The City and County noise criteria for stationary sources will be used to assess potential stationary source noise impacts. Using the project site plan, LSA will determine future stationary sources noise impacts from proposed project incorporating equipment noise specifications from the manufacturers or published noise levels from similar equipment. • Mitigation Measures: If necessary, LSA will determine temporary construction-related noise and vibration reduction features which can be incorporated into the project plans, designed to reduce short-term construction noise and vibration impacts, as well as long-term operational impacts. • Noise and Vibration Report: LSA will summarize the above findings in a draft technical report that will also include the settings and regulatory requirements. LSA Noise Staff will respond to one round of consolidated comments from the client and Cities after which a Final Noise and Vibration Impact Analysis memorandum will be provided. This estimate includes one set of comments from the client and one round of minor comments from the City (requiring a total of 8 hours or less) in response to the Draft Report.

Task 3.5 Water Quality and Hydrology Technical Memorandum.

LSA will prepare a Hydrology and Water Quality Report that evaluates project-related and cumulative impacts to water quality, groundwater, hydrology, and floodplains. • The Hydrology and Water Quality Report: LSA will prepare a report that includes a discussion of the existing setting, applicable federal, State, regional and local regulations, and applicable CEQA significance thresholds related to hydrology and water quality. The impact analysis will include a qualitative response to each of the CEQA thresholds in Appendix G of the State CEQA Guidelines.

LSA will evaluate the need for best management practices (BMPs) to ensure compliance with federal, State, and local National Pollutant Discharge Elimination System (NPDES) permit requirements and local ordinances during construction and operation. However, because the 7 12/19/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) analysis is at a programmatic level, the Hydrology and Water Quality Report will not specify specific construction, source control, site design, low impact development, design pollution prevention, or treatment control Best Management Practices (BMPs) or drainage improvements. This estimate includes one set of comments from the client and one round of minor comments from the City (requiring a total of 8 hours or less) in response to the Draft Report.

PHASE 4: CEQA COMPLIANCE- INITIAL STUDY/ MITIGATED NEGATIVE DECLARATION Task 4.1: Administrative Draft IS/MND
LSA will provide environmental planning services to support the development and environmental clearance of the North Bay Regional Water Treatment Plant Expansion and Pipeline Project. LSA will prepare an Administrative Draft Initial Study/Mitigated Negative Declaration based on the Applicant- provided technical studies and independent analysis and prescribe mitigation where necessary to reduce environmental impacts of the project to less than significant levels. LSA will review the relevant General Plans, project plans, pertinent environmental data, and other relevant documents to ascertain the extent of potential environmental impacts. LSA will address the following environmental factors presented in Appendix G of the CEQA Guidelines as they relate to the project, applicable City standards, and/or the standards of State or federal entities:
 Aesthetics  Mineral Resources
 Agriculture and Forestry Resources  Noise
 Air Quality  Population and Housing
 Biological Resources  Public Services
 Cultural Resources  Recreation
 Energy  Transportation
 Geology and Soils  Tribal Cultural Resources
 Greenhouse Gas Emissions  Utilities and Service Systems  Hazards and Hazardous Materials  Wildfire
 Hydrology and Water Quality  Mandatory Findings of Significance  Land Use and Planning
The Administrative Draft IS/MND will be provided to the City of Fairfield for review and comment.

Following one round of consolidated comments, LSA will produce the Public Review Draft IS/MND.

LSA will complete the Administrative Draft Initial Study within four weeks of receipt of all required project materials, final technical studies and completion of Assembly Bill 52 (AB52) consultation results.

Task 4.2: Native American Consultation Assistance
At the request of the lead agency, LSA will request a record search of the Sacred Lands File (SLF) held by the Native American Heritage Commission (NAHC) for any information regarding cultural resources of traditional or cultural value to Tribal organizations located within the project area. In addition, LSA may draft and distribute AB 52 consultation letters via email (or USPS Certified Mail, if necessary) to Tribal contacts identified by the NAHC, and will conduct up to two rounds of follow-up emails on behalf of the applicant if no responses are received. Should NEPA documentation be required due to federal funding or permitting, LSA will notify interested Tribal parties of project details for comment as part of the 8 12/19/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) Section 106 consultation and maintain communications with Tribal parties. All correspondence with Tribal parties, including letters and emails, will be compiled in an administrative record and included as an attachment to the final report. This scope assumes no meetings with Tribal stakeholders.

Task 4.3: Public Review Draft IS/MND
LSA will make any minor necessary revisions to the Administrative Draft and prepare a Screencheck Draft IS/MND for approval by the City. LSA will make any minor necessary revisions to the Screencheck Draft IS/MND to prepare the Public Review Draft IS/MND. The MND will be circulated for the full 30-day public review period. LSA will prepare the Notice of Intent (NOI) to adopt an MND, Notice of Completion (NOC), and State Clearinghouse Summary Form, and will submit the IS/MND and all associated documents electronically to the State Clearinghouse.

It is assumed that the City of Fairfield, as the CEQA Lead Agency, will be responsible for:
• Preparing and providing the agency and public distribution list • Publishing the NOI in a newspaper of general circulation • Provide the IS/MND on the City’s website for public review • Noticing adjacent and nearby property owners in accordance with CEQA requirements • File the NOI with the Solano County Clerk-Recorder
Task 4.4: Public Review/Response to Comments
At the conclusion of the public review period, LSA will review all public and agency comments received on the Draft IS/MND and prepare written responses to up to three (3) comment letters. Draft responses will be submitted to the City for review and approval. Should more than three substantive comment letters be received, or should additional technical studies be necessary, LSA may require a budget adjustment and written authorization to proceed.

Task 4.5: Mitigation Monitoring and Reporting Program
LSA will prepare a Mitigation Monitoring and Reporting Program (MMRP) to implement the mitigation measures outlined in the Initial Study for the project in accordance with CEQA Guidelines Section 15097.

The mitigation measures would be included in a matrix check -off format for ease of tracking their implementation.

Task 4.6: Final IS/MND and Notice of Determination
Based on the City’s review and approval of the draft Final IS/MND, LSA will prepare a Final IS/MND that incorporates the response to comments and MMRP. Upon project approval and adoption of the MMRP, LSA will prepare the Notice of Determination (NOD) and submit it electronically to the State Clearinghouse within five (5) days of its adoption.

It is assumed that the City will file the NOD with the Solano County Clerk-Recorder and will be responsible for paying the California Department of Fish and Wildlife (CDFW) environmental filing fee and any applicable county filing fees.
9 12/19/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) Deliverables
• Administrative Draft IS/MND (MS Word and PDF format)
• Public Review Draft IS/MND (MS Word and PDF format)
• NOI, NOC, and State Clearinghouse Summary Form
• Draft and Final Response to Comments
• Draft and Final MMRP
• Final IS/MND (with figures and appendices)
• Draft Notice of Determination (NOD)
PHASE 5: PERMITTING
Based on the final pipeline alignment, project description, and technical study findings, LSA will assist with identifying, preparing, and submitting permit applications and supporting documentation required for federal and State regulatory compliance. The Project area may cross multiple jurisdictional boundaries, including aquatic resources regulated by federal and State agencies. As such, the following permits and coordination are anticipated.

Task 5.1: Agency Permits
Based on potential impacts to jurisdictional waters, sensitive biological resources, and other regulated features, the following regulatory authorizations may be required:
• U.S. Army Corps of Engineers (USACE) – Nationwide Permit (NWP) under Section 404 of the Clean Water Act for discharges of dredged or fill material into waters of the U.S. (Aquatic Resources Delineation to support the permitting efforts is discuss in Task 2.3.2). • State Water Resources Control Board (SWRCB) – Clean Water Act Section 401 Water Quality Certification. Given that the Project spans two Regional Water Quality Control Board (RWQCB) jurisdictions (San Francisco Bay and Central Valley/Sacramento), coordination with both boards will be required.
• California Department of Fish and Wildlife (CDFW) – Lake and Streambed Alteration Agreement (LSAA) under Section 1600 et seq. of the California Fish and Game Code for activities affecting the bed, bank, or channel of a stream or associated riparian habitat. A Section 2081 of the California Fish and Game Code Incidental Take Permit for effects to state listed threatened and endangered species.
• CDFW and US Fish and Wildlife Service (USFWS) – Incidental take authorized.

LSA will assist in preparing draft permit applications, including required maps, technical reports, and attachments. Once reviewed and approved by the Cities, LSA will finalize and submit the applications on their behalf.
10 12/19/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) Task 5.2: Aquatic Resources Delineation.

An Aquatic Resources Delineation Report (ARDR) will be prepared in accordance with the USACE Minimum Standards for Acceptance of Aquatic Resources Delineation Reports, dated January 2016 and the USACE Regulatory Guidance Letter 16-01 (October 2016) regarding Preliminary Jurisdictional Delineations. The report will include a description of the setting, a discussion of the methods and results, the completed wetland data forms, location and vicinity maps, and a preliminary delineation map showing the limits of all potential jurisdictional waters of the United States/State on the site.

Task 5.3: Alternatives Analysis.

A narrative alternatives analysis will be prepared to support the Section 404 with USACE and Section 401 with SWRCB permitting processes. The analysis will describe the range of considered alternatives, including the preferred alignment, and provide justification for why the selected alternative represents the Least Environmentally Damaging Practicable Alternative (LEDPA) in accordance with Clean Water Act guidelines.

Task 5.4: Initial Take Permit.

If the Project has the potential to result in take of State-listed species, LSA will provide technical input to support preparation of an Incidental Take Permit (ITP) application to CDFW under the California Endangered Species Act (CESA), including relevant biological survey data, avoidance and minimization measures, and proposed mitigation. Additionally, USFWS will need to provide Incidental take authorized under either a Section 7 consultation through the USACE permit process or Section 10 Habitat Conservation Plan.

Task 5.5: Travis Air Force Base Coordination.

Due to the proximity of the Project to Travis Air Force Base and the associated County’s Land Use Compatibility Plan (LUCP) restrictions regarding wildlife hazards, LSA will coordinate with the appropriate environmental and airspace compliance contacts at the base to ensure that the Project does not conflict with the LUCP precluded uses. Potential wildlife hazard compatibility issues include new settling ponds and construction of mitigation wetlands. A summary of coordination, correspondence, and any resulting conditions will be documented for inclusion in CEQA and permit filings.

Deliverables
• Draft and Final Permit Application Packages (USACE NWP, SWRCB 401 Certification, CDFW LSAA), including all appropriate figures to support the application and project • Aquatic Resources Delineation Report (ARDR) with maps and data forms • Alternatives Analysis Report (required for SWRCB permitting and possibly USACE depending on amount of wetland fill)
• Incidental Take Permit (ITP) supporting materials (if applicable) • Documentation of coordination with Travis Air Force Base 11 12/19/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP) OPTIONAL: NEPA COMPLIANCE FOR FEDERALLY FUNDED PROJECTS If NEPA documentation is required due to federal funding or permitting, LSA can assist in preparing the appropriate level of NEPA compliance documentation, such as a Categorical Exclusion or Environmental Assessment. This may include:
• Coordination with the federal lead agency identified for the grant or permitting process • Preparation of cross-cutting federal environmental compliance documentation, including Section 106 and Section 7 consultations as applicable
• Integration of environmental analyses, technical studies, impact assessments, and mitigation measures into NEPA documentation
Please note: Identification of the NEPA lead agency is not included in this scope. If an Environmental Assessment or additional NEPA documentation is required, a separate scope of work and budget will be provided at that time, specific to the needs and requirements of the individual federal agency. All technical studies prepared under this proposal will be completed at a level suitable for NEPA, facilitating efficient incorporation into federal compliance documents and supporting timely project review.

ASSUMPTIONS
• This proposal does not include focused surveys, handling of special status species, or documentation beyond what has been described in this scope of work. If after the biological field survey, focused surveys are warranted, an additional scope and fee will be provided. • West Yost will provide all additional project details required for completion of the required permit applications beyond what is described in this proposal. • In the event of positive archaeological findings, more than one set of comments requiring response, or other potential issues necessitating any substantive unanticipated effort and/or expenditure of budget (i.e., not within this scope of work or cost estimate), a contract amendment will be required. • This proposal does not include the preparation of a long-term routine maintenance Agreement or any other long-term maintenance permits.
• This proposal does not include mitigation and permitting fees which may be required by regulatory agencies. The client will pay all permits, notifications, and processing fees directly to each applicable agency.
• LSA has no influence on the timeliness of review or issuance of permits by outside agencies such as CDFW, USACE, SWRCB and RWQCB.
• The client will provide access to the site for field surveys. • All mitigation costs and fees will be paid by the client. • NEPA documentation and assistance will be provided under a different scope and budget, if requested.
12 12/19/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP)

COST ESTIMATE
Table A. Cost Estimate
Task Cost Estimate
PHASE 2: Project Management
Project Management and Coordination $12,000
Project Description $5,700
PHASE 3: Technical Studies
Biological Resources $22,100
Cultural Resources $15,500
Air Quality and Greenhouse Gases $11,500
Noise Assessment $10,100
Water Quality Assessment $6,600
PHASE 4: CEQA Compliance Initial Study Mitigated Negative Declaration (IS/MND) Administrative Draft IS/MND $25,000
Native American Consultation (AB 52) $5,300
Public Review Draft and Notices (NOC and NOI) $7,200
Public Review Response to Comments $3,000
MMRP $2,000
Final IS/MND and NOD $3,000
PHASE 5: Agency Permitting
United States Army Corps of Engineers 404 Nationwide Permit $10,700 State Water Resources Control Board 401 Certification $14,800 California Department of Fish and Wildlife Streambed Alteration Agreement $18,100 Aquatic Resources Delineation $11,600
Alternatives Analysis $20,300
CDFW and USFWS Initial Take Permit (ITP) and Section 7 Authorization $18,100 Travis Airforce Base Coordination $7,100
Reimbursables
Reimbursables (Record Search, Mileage, Lodging, Meals) $3,000 TOTAL COST $232,700
Note: This scope and budget continues from the NTP for Phase 1: Preliminary Assessment Assistance (Tasks 1.1 and 1.2) and therefore starts at Phase 2.

THE ABOVE STATED TERMS ARE HEREBY ACCEPTED AND AUTHORIZED.

CONSULTANT: CLIENT:

LSA Associates, Inc. West Yost
Company Company

Authorized Signature Authorized Signature

Name Name

Title Title

Date Date
13 12/19/25 (Z:\01-Proposals\01-Proposals by Year\2025\Environmental Planning\20252263.P West Yost_North Bay WTP)

Scope of Work – Pipeline Alignment Study [Task 92]

Attachment D

100 Howe Avenue
Suite 110S
Sacramento CA 95825
916.306.2250 phone
530.756.5991 fax
westyost.com

Engineering Services Scope of Work - Pipeline Alignment Study for Transmission Mains associated with the North Bay Regional Water Treatment Plant Expansion Program
This scope pr ovides the City of Vacaville (City) with recommended services, budget and schedule for a pipeline alignment study for transmission mains identified as part of the North Bay Regional Water Treatment Plant (NBR WTP) Expansion Program (Program). The proposed work would be conducted as a separate task under West Yost’s existing NBR WTP Program Management contract administered by the City of Fairfield. The work would consume a portion of the as -needed budget currently reserved for services such as are proposed here.

BACKGROUND
West Yost is supporting the Cities of Fairfield and Vacaville in developing contract documents for a future expansion of the North Bay Regional Water Treatment Plant (NBR WTP). As part of this effort, several studies and tests are being conducted to inform the scope of the expansion. For the City of Vacaville, a hydraulic evaluation was completed to determine the transmission mains needed to convey the increased water supply from the expanded NBR WTP. The evaluation identified three critical segments of new or replacement transmission mains that must be implemented for the City to be able to hydraulically convey the expanded water supply.

One of the proposed pipeline segments will span the distance from the NBR WTP to existing transmission mains near the south boundary of Vacaville, most likely at the intersection of Vanden Road and Leisure Town Road. This alignment was originally proposed in the 2023 Water Master Plan and has since been confirmed through recent hydraulic modeling. Figure 8 -1 from the 2023 Water Master Plan, included as Attachment A, on the ri ght figure tit led “DE Plant Site / NBR Plant Ex pansion” illustrates this pipeline alignment (refer to H-XP-PIPE-05).

The conceptual alignment of this pipeline presents implementation challenges, as it is currently crosses a conservation easement. Therefore, the purpose of this scope of work is to identify up to three alternative alignments, each beginning at the NBR WTP and terminating at the intersection of Vanden Road and Leisure Town Road. The findings and recommendations of this study will define the pipeline improvements to support development of a detailed design scope and budget. This will enable the City to advance the pipeline construction either independently, or in conjunction with the NBR WTP expansion.

SCOPE OF SERVICES
The following are the proposed tasks for this scope of services, each further described in the sections below:
• Task 1. Project Management
August 22, 2025

X-X-XXX-XXX-XXX

• Task 2. Pipeline Alignment Study
Task 1. Project Management
In this task, West Yost will perform project team management and quality assurance/quality control (QA/QC) reviews.

Task 1.1. Project Administration
Monitor progress of tasks and coordinate completion of work products, including monitoring task budgets and project schedule . A report of budget status on a task -by-task basis, in addition to any schedule changes, will be provided with each invoice.

Task 1.2. Kickoff Meeting
Lead an in-person kickoff meeting to discuss the study activities and any action items as necessary to initiate the project. The kickoff meeting will also include identification of the alternatives to be evaluated further by engaging a diverse group of staff (planning and engineering/leadership) from both Fairfield and Vacaville, as well as a representative from the environmental review team for the NBR Expansion Program.

Task 1.2. Project Workshops
Attend up to two virtual project workshops to review and discuss findings of the pipeline alignment study following the draft and final submissions.

Task 1 Assumptions
• The kickoff meeting will be an in-person meeting at the NBR WTP or Easterly WWTP, for a duration of 1.5 to 2 hours.
• Steve Foreman of LSA will provide insights and share knowledge of the environmental considerations in the vicinity of the NBR WTP under a separate budget on behalf of the overall NBR Expansion Program.
• It is assumed that the project workshops will be held virtually, via Microsoft teams, for a duration of one hour.

Task 1 Deliverables
• West Yost will provide meeting agendas and an action item list.

Task 2. Pipeline Alignment Study
In this task, West Yost will conduct a study to assist the Cities in selecting the preferred alignment alternative.

Task 2.1. Alignment Study Technical Memorandum
The pipeline alignment study will be informed by a combination of field reconnaissance and a review of existing documentation and records provided by both Vacaville and Fairfield . West Yost will first summarize the applicable design requirements as provided by the City of Vacaville, or agreed upon at the kick-off meeting. Any alternatives unlikely to meet those criteria will be eliminated from further consideration.

Evaluation of the remaining potential alignments, up to three, will consider several key criteria, including but not limited to the following:

August 22, 2025

X-X-XXX-XXX-XXX

• Right-of-Way (ROW) Availability and Constraints. This includes identifying existing public and private ROWs, easements, and utility corridors, as well as assessing the need for new easement acquisitions or coordination with other agencies and property owners. • Constructability. This will include an assessment of physical and/or logistical factors that may affect construction, such as: topography, existing infrastructure, utility conflicts, access limitations, and geotechnical conditions.
• Environmental Impacts: Potential environmental constraints will be reviewed, including impacts to sensitive habitats, wetlands, protected species, and cultural resources. The study will also consider permitting requirements and mitigation strategies. • Cost Considerations: Preliminary cost estimates will be developed for each viable alignment alternative, taking into account construction, materials, permitting, land acquisition, long- term maintenance, and implementation.

Findings and recommendations will be documented in a technical memorandum (TM). The memorandum will include a map of the alignments evaluated, a comparative analysis of alternatives, a summary of key constraints and opportunities , and a summary of the recommended design criteria . The TM will also include preliminary plan and profile drawings of the preferred alternative showing surface features based on readily available imagery and topographic data. Potential utility conflicts will be shown in plan view only, and only to the extent they can be identified by existing information. An Underground Service Alert inquiry will not be performed at this preliminary phase of the project.

It is important to note that the scope does not include updates to the Vacaville hydraulic model. However, a desktop hydraulic performance evaluation will be prepared to assess the relative hydraulic performance of the different alignments considered.

Task 2 Assumptions
• Vacaville and Fairfield will supply existing records of infrastructure that the pipeline will cross or will be connected to.
• Vacaville and Fairfield will provide a single consolidated set of comments to the Draft Pipeline Alignment Study Technical Memorandum.
• West Yost will evaluate up to three (3) alignment alternatives. • West Yost will provide LSA a preliminary draft for review and comment on environmental aspects of the evaluation.

Task 2 Deliverables
• Draft Pipeline Alignment Study Technical Memorandum
• Final Pipeline Alignment Study Technical Memorandum

PROJECT BUDGET
West Yost’s proposed level of effort and budget for each of the tasks described above is shown in Table 1.

West Yost will perform the scope of services described above on a time-and-expenses basis, tracked as a separate task under the existing NBR WTP Expansion Program Management contract. A budget augmentation for the NBR WTP Expansion Program Management budget is not requested at this time; however, the proposed work will consume a portion of the existing “As Needed Services” budget. Any additional related services not included in this scope of services will be performed only after receiving authorization and agreement on budget allocation.

August 22, 2025

X-X-XXX-XXX-XXX

Table 1. Estimated Project Hours and Budget
Task
Level of Effort,
hours
Estimated Budget,
dollars
Task 1. Project Management 34 11,800
Task 2. Project Alignment Study 288 83,400
Total Project Hours and Budget 322 95,200

SCHEDULE
West Yost anticipates providing the draft Technical Memorandum within ten (10) weeks after receiving notice to proceed and all required data.

Attachments: A. Figure 8-1 from 2023 Water Master Plan

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Figure 8-1 from 2023 Water Master Plan
Attachment A
0 1

0.5 Miles
Notes:

1. The Lower Lagoon Valley, Montessa, and Vanden Meadows projects are already in the development phase, therefore the infrastructure associated with these projects isn't included in the CIP .

2. The only CIP Projects not shown on this figure are the studies listed in Table 8-2 (EX-BASE-STU-01 through EX-BASE-STU-06).

3. The recommended pipeline rehabilitation and replacement priority improvements are presented on Figure 8-2.
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