Agenda packet — San Juan Bautista City Council, March 25, 2025

City of San Juan Bautista
The “City of History”
www.san-juan-bautista.ca.us

CITY COUNCIL

SPECIAL MEETING
TUESDAY, MARCH 25, 2025, 5:30 P.M.

HYBRID MEETING
City Hall, Council Chambers
311 Second Street, San Juan Bautista, California
AGENDA

ZOOM WEBINAR PARTICIPATION
The meeting can also be accessed by the public in the following methods: Through Zoom (https://zoom.us/join) per the instruction stated below, and on Facebook.

Please note: If all Council Members are present in person, public participation by Zoom or viewing on Facebook is for convenience only and is not required by law. If the Zoom or Facebook feed is lost for any reason the meeting may be paused while a fix is attempted but the meeting may continue at the discretion of the presiding officer.

JOIN ZOOM WEBINAR TO PARTICIPATE LIVE
https://us02web.zoom.us/j/88373320235

To participate telephonically:
call 1 (669) 900-6833
Webinar ID: 883 7332 0235

PUBLIC COMMENT - ADVISEMENT
Public comments are limited to items on this special meeting agenda pursuant to California Government Code section § 54954.3(b). Public comments are generally limited to three (3) minutes per speaker; the Mayor may further limit the time for public comments depending on the agenda schedule.

1. CALL TO ORDER
A. Pledge of Allegiance
B. Roll Call
Page | 2 City Council March 25, 2025

2. CONSENT
All matters listed under the San Juan Bautista City Council Consent Agenda may be enacted by one motion unless a member of the City Council or the public requests discussion or a separate vote.

A. Approve the Affidavit of Posting Agenda.

B. San Juan Bautista Water Transmission Pipeline Design Services Recommendation: Approve a RESOLUTION Authorizing Staff to publish a Request for Proposals (“RFP”) for San Juan Bautista Water Transmission Pipeline Design Services.

3. WORKSHOP
A. Workshop Regarding Water and Waste Water Compliance Project Recommendation: No Action. Receive report and provide feedback. i. Wastewater Pipeline Update
ii. Drinking Water Pipeline RFP
iii. Water and Wastewater Project Finance Strategy Update

4. ADJOURNMENT – 7:30 P.M.

AGENDA MATERIAL / ADDENDUM
Any addendums will be posted not later than 72 hours before regular meetings or 24 hours of special meetings unless otherwise allowed under the Brown Act. City Council reports may be viewed at the City of San Juan Bautista City Hall at 311 Second Street San Juan Bautista and are posted on the City website www.san-juan-bautista.ca.us subject to Staff’s ability to post the documents before the meeting, or City Clerk Elizabeth Soto at [email protected] or calling (831) 623-4661 during normal business hours.

In compliance with the Americans with Disabilities Act, and Govt. Code 54953(a), the city will make reasonable arrangements to ensure accessibility to this meeting. If you need special assistance to participate in this meeting, please contact the City Clerk, a minimum of 48 hours prior to the meeting at (831) 623-4661.

If you challenge any planning or land use decision made at this meeting in court, you may be limited to raising only those issues you or someone else raised at the public hearing held at this meeting, or in written correspondence delivered to the City Council at, or prior to, the public hearing. Please take notice that the time within which to seek judicial review of any final administrative determination reached at this meeting is governed by Section 1094.6 of the California Code of Civil Procedure.

A Closed Session may be called during this meeting pursuant to Government Code §54956.9 (d)(2) if a point has been reached where, in the opinion of the legislative body of the City on the advice of its legal counsel, based on existing facts and circumstances, there is a significant exposure to litigation against the City.

PUBLIC COMMENT PROCEDURES
If you wish to make a public comment and are attending in person, please fill out a speaker card. If you are attending via Zoom, join the Zoom Webinar, and use the "Raise Hand" or if joining by telephone, press *9 on your telephone keypad icon.

SUBMISSION OF PUBLIC COMMENTS
Written comments may be submitted via mail to the City Clerk at City Hall (P.O. Box 1420, San Juan Bautista, CA 95045), or emailed to [email protected] no later than 3:00 p.m. on the day of the meeting. Written comments will be read into the record provided that the reading does not exceed three (3) minutes.

PUBLIC NOTIFICATION
This agenda was posted on Friday, March 21, 2025, on the bulletin board at City Hall, 311 Second Street, the bulletin board at the City Library, 801 Second Street, the bulletin board at the entrance to the United States Post Office, 301 The Alameda, and the City’s website. Meetings are streamed live at https://www.facebook.com/cityofsanjuanbautista/.

Item: 2.A
City Council Meeting
March 25, 2025

AFFIDAVIT OF POSTING
I, Elizabeth Soto, Do Now Declare, Under the Penalties of Perjury That I Am the Acting City Clerk / Administrative Services Manager in the City of San Juan Bautista and That I Posted Three (3) True Copies of the attached City Council Agenda. I Further Declare That I Posted Said Agenda on the 21st day of March 2025, and in the Following Locations in said City of San Juan Bautista, County of San Benito, California.

1. On The Bulletin Board at City Hall, 311 Second Street.

2. On The Bulletin Board at The City Library, 801 Second Street.

3. On The Bulletin Board at The Entrance to The United States Post Office, 301 The Alameda
Signed at San Juan Bautista, County of San Benito, California, on the 21st day of March 2025.
____________________________________________
Elizabeth Soto, CMC, CPMC
City Clerk / Administrative Services Director
Item: # 2.B
City Council Meeting
March 25, 2025
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CITY OF SAN JUAN BAUTISTA

CITY COUNCIL STAFF REPORT
DATE: MARCH 25, 2025
DEPARTMENT: CITY MANAGER
FROM: ASHLEY COLLICK, INTERIM CITY MANAGER

TITLE: REQUEST FOR PROPOSALS FOR SAN JUAN BAUTISTA

WATER TRANSMISSION PIPELINE DESIGN SERVICES
RECOMMENDED MOTION:

Approve a Resolution Authorizing Staff to publish a Request for Proposals (“RFP”) for San Juan Bautista Water Transmission Pipeline Design Services.

BACKGROUND:

The City of San Juan Bautista is a municipality in San Benito County that is home to approximately 2,000 residents, an iconic Mission, and a historic State Park. The city is largely an agricultural community. Currently, the largest producer of organic salads in The United States is based in San Juan Bautista.

The city is run by a City Manager/City Council form of government. The City Manager oversees daily operations, while the 5-member Council is elected at-large to represent Citywide interests. The city employs 12 full-time employees, half of which are committed to its water and wastewater utilities. The city relies heavily upon contract service providers, including its City engineering and building departments.

San Juan Bautista’s proximity to Santa Clara’s Silicon Valley makes the city a vital neighbor to the nation’s technology industry.

PROJECT DESCRIPTION
The development of a drinking water pipeline and connecting it to the West Hills Water Treatment Plant is part 2 of the compliance project to address salinity in the city’s drinking water.

This project will provide a new source of drinking water to the City of San Juan Bautista (City).

The City needs additional capacity to meet current and future demands for a system that relies on multiple groundwater wells. The existing wells have had high levels of nitrate and hardness and are not a reliable source of drinking water.

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The project will provide a new 12” transmission pipeline from the San Benito County Water District’s (District) West Hills Water Treatment Plant (WHWTP) to the city is proposed to be constructed along HWY 156 to the City’s water system near the Well No. 6 treatment system.

The goal of this transmission pipeline is to improve water reliability and provide additional capacity to the City system.

We anticipate circulating the RFP in March 2025, evaluations in April 2025, and coming back to the City Council for approval in May 2025. The RFP will be on file with the City Clerk’s office and will be posted on the City’s website and advertised.

Request for Proposal (RFP) Purpose
The goal of the city is to retain a Professional Contractor familiar with “Best Practice” management techniques in their particular line of work. The city is requesting proposals from consultants specializing in the required services outlined in the Scope of Services section of the Request for Proposal.

Item: # 2.B
City Council Meeting
March 25, 2025
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Staff have directed a request for proposals to be prepared for the process of selecting a consultant for the Design and Environmental phase of the Water Transmission Pipeline project.

The selected consultant will perform all engineering and project management-related work necessary to prepare plans and specifications suitable for Public Works bidding per the details of the Basis of Design Report, the RFP, and its appendices.

Consultant services shall include, but are not limited to: Project management, preliminary design, design development, permitting, bid documents, bidding support, and construction support services.

Selection Process:

Proposals will be evaluated based upon, but not limited to, the following criteria (not listed in order of importance):

1. Project methodology and approach

2. Firm’s standing and capability to provide the required services

3. Qualifications and experience of the firm and the personnel named in the proposal

4. Technical expertise and resources

5. Past performance on governmental engagements on similar projects, based on client references and other verifiable information

6. Overall cost
Proposals will be reviewed and evaluated by the city. Oral interviews of the most responsive firms may be scheduled shortly after the deadline submission date and may be conducted remotely or by phone at the option of the city.

The City reserves the right to award a contract based on proposal submittal only, without benefit of an oral interview.

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Ranked Responses
The City will rank two or more offerors based on their professional qualifications and proposed services, in order of preference. Negotiations will begin with the highest-ranked offeror.

If a satisfactory and advantageous contract can be negotiated at a fair and reasonable price, the award will be made to that offeror. If not, negotiations with the highest-ranked offeror will be formally terminated, and discussions will proceed with the next-ranked offeror, and so on until a fair and reasonable contract is reached. The City reserves the right to make multiple awards as a result of this solicitation
Evaluation Criteria
The following weighting and points will be assigned to this Request for Proposals:

Award
The contract will be awarded based on what is in the City's best overall interest. Award will be made to the lowest, responsive, and responsible respondent(s) who, in the City’s sole judgment, has the necessary experience, skill, business standing, equipment, staffing, and financial stability to provide professional civil engineering services.

Accordingly, the City reserves the right to award one or more contracts based on professional qualifications and areas of expertise.

NO COMMITMENT TO AWARD
Issuance of this RFP and receipt of proposals does not commit the city to award a contract. The City expressly reserves the right to postpone proposal opening for its own convenience, to accept or reject any and/or all proposals received in response to this RFP, to negotiate with more than one respondent concurrently, or to cancel all or part of this proposal.

The City further reserves the right to negotiate material aspects of proposals received, including costs, services, and scheduling, when determined to be in the best overall interest of the city.

Item: # 2.B
City Council Meeting
March 25, 2025
Page | 5
FISCAL IMPACT:

The funding for this project will be provided by the Water Enterprise Fund.

ATTACHMENTS:

1. Request for proposals for San Juan Bautista water transmission pipeline design services Page | 1
RESOLUTION NO. 2025-XX

A RESOLUTION OF THE CITY OF SAN JUAN BAUTISTA APPROVING REQUEST

FOR PROPOSALS (RFP) FOR SAN JUAN BAUTISTA WATER TRANSMISSION

PIPELINE DESIGN SERVICES
WHEREAS, the City of San Juan Bautista has identified the need for professional design services related to the San Juan Bautista Water Transmission Pipeline; and WHEREAS, the City of San Juan Bautista desires to solicit proposals from qualified firms to provide the necessary engineering, planning, and design services for the development of the San Juan Bautista Water Transmission Pipeline; and
WHEREAS, the City of San Juan Bautista has determined that the most appropriate and effective method to select a firm for the project is through a competitive Request for Proposals ("RFP") process; and
WHEREAS, the publication of an RFP will allow the City of San Juan Bautista to evaluate and select a qualified consultant based on their qualifications, experience, and proposed approach to the project; and
WHEREAS, it is in the best interest of the City of San Juan Bautista to proceed with publishing an RFP to solicit proposals for the San Juan Bautista Water Transmission Pipeline Design Services.

NOW, THEREFORE, BE IT RESOLVED, BY THE CITY COUNCIL OF THE CITY SAN JUAN BAUTISTA, AS FOLLOWS:

1. The City of San Juan Bautista City Council hereby authorizes staff to prepare and publish a Request for Proposals ("RFP") for the San Juan Bautista Water Transmission Pipeline Design Services.

2. The RFP shall be published in accordance with the applicable procurement procedures and shall invite proposals from qualified firms to provide the necessary design services for the San Juan Bautista Water Transmission Pipeline.

3. The City of San Juan Bautista shall evaluate the proposals received in response to the RFP and select a qualified consultant based on their qualifications, experience, proposed approach, and pricing.

4. Staff is directed to return to the City Council with a recommendation for the selection of a consultant following the evaluation of proposals.

5. The City Council further directs staff to undertake all necessary actions to implement this resolution.

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PASSED AND APPROVED by the San Juan Bautista City Council on this 25th day of March, 2025, by the following vote:

AYES:

NOES:

ABSENT:

ABSTAIN:

APPROVED:
______________________
Leslie Q. Jordan, Mayor
ATTEST:
________________________
Elizabeth Soto, City Clerk
ATTACHMENT:

1. Staff Report

2. Request for proposal for San Juan Bautista water transmission pipeline design services

REQUEST FOR PROPOSAL
FOR

SAN JUAN BAUTISTA WATER

TRANSMISSION PIPELINE

DESIGN SERVICES
Proposal Release Date 03/26/2025
Last Date/Time for Questions 04/11/2025
2:00 pm PST
Proposals Due at City 05/01/2025
2:00 pm PST
Submit Proposals to:

Ashley Collick, Interim City Manager
[email protected]

Page 2 ends

Table of Contents
BACKGROUND..................................................................................................................................... 3 NOTICE TO PROPOSERS ....................................................................................................................... 4 Request for Proposal (RFP) Purpose .................................................................................... 4 Terminology ............................................................................................................................. 4 Description of Work................................................................................................................. 4 Availability and Clarification of Documents.......................................................................... 4 Regulatory Requirement ......................................................................................................... 4 Question Submittal.................................................................................................................. 5 Estimated Timeline.................................................................................................................. 5 PROPOSAL PREPARATION.................................................................................................................... 5 Pre-Award Expenses............................................................................................................... 7 Cost Proposal........................................................................................................................... 8 PROPOSAL SUBMITTAL ........................................................................................................ 8 Late Proposals ......................................................................................................................... 8 Withdrawal or Modifications of Proposals ........................................................................... 8 Confidential Information ......................................................................................................... 8 Proposal Acceptance and Rejection ..................................................................................... 8 SCOPE OF SERVICES............................................................................................................................10 SELECTION PROCESS...........................................................................................................................15 Award...................................................................................................................................... 16 KEY PERSONNEL .................................................................................................................................17 FAITHFUL PERFORMANCE BOND .........................................................................................................17 INSURANCE........................................................................................................................................17 BOND/INSURANCE SUBMITTAL ...........................................................................................................17 INDEMNIFICATION .............................................................................................................................18 TERMINATION....................................................................................................................................19 PROTESTS ..........................................................................................................................................19 NO COMMITMENT TO AWARD............................................................................................................19 OWNERSHIP OF WORK PRODUCT........................................................................................................20 NON-ENDORSEMENT..........................................................................................................................20 GOVERNING LAW ...............................................................................................................................20 COMMENTS/EXCEPTIONS ...................................................................................................................20 ATTACHMENT 1: Basis of Design Report Update - San Juan Bautista Transmission Pipeline................................................................................................................................... 21 ATTACHMENT 2: Congratulations on Your U.S. EPA Region 9 Grant Award!.............. 22

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BACKGROUND
The City of San Juan Bautista is a municipality in San Benito County that is home to approximately 2,000 residents, an iconic Mission, and a historic State Park. The City is largely an agricultural community. Currently, the largest producer of organic salads in the United States is based in San Juan Bautista.

San Juan Bautista is also a popular tourist destination, rich in historic and cultural sites.

One local attraction, the Fremont Peak Observatory situated atop Fremont Peak in the Gabilan Range, is a non-profit astronomical institution serving the local community.

The City is run by a City Manager/City Council form of government. The City Manager oversees daily operations, while the 5-member Council is elected at-large to represent Citywide interests. The City employees 10-full-time employees, half of which are committed to its water and wastewater utilities. The Assistant City Manager also serves as its Community Development Director. The City Manager supports Public Works. The City relies heavily upon contract service providers, including its City Engineer and Building departments.

San Juan Bautista’s proximity to Santa Clara’s Silicon Valley makes the City a vital neighbor to the nation’s technology industry.

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SAN JUAN BAUTISTA

NOTICE TO PROPOSERS
Notice is hereby given that the City of San Juan Bautista (City) will receive proposals for SAN JUAN BAUTISTA WATER TRANSMISSION PIPELINE DESIGN SERVICES at:

City of San Juan Bautista
ATTN: Ashley Collick, Interim City Manager
311 Second Street
P.O. Box 1420
San Juan Bautista, CA 95045
until 05/01/2025 at 2:00 PM, PST. Email submission may be made in lieu of mailing a hard copy of the proposal to: [email protected] There will be no public bid opening.

Request for Proposal (RFP) Purpose
The goal of the City is to retain a Professional Contractor familiar with “Best Practice” management techniques in their particular line of work. The City is requesting proposals from consultants specializing in the required services outlined in the Scope of Services section of this Request for Proposal.

Terminology
For purposes of this Request for Proposal, “Contractor” may also be referred to as Company, Consultant, Firm, Respondent, Proposer, Supplier or Vendor.

Description of Work
The proposed work is officially known as the Specifications, as further described in the SCOPE OF SERVICES section of this RFP.

Availability and Clarification of Documents
This RFP and any addendums may be posted on the City website at:
https://www.san-juan-bautista.ca.us
Regulatory Requirement
Consultants must possess a valid Civil Engineering License (C) issued by the California Department of Consumer Affairs, Board for Professional Engineers, Land Surveyors, and Geologists.

Page 5 ends

Question Submittal
Any questions related to this RFP should be submitted in writing to Ashley Collick, Interim City Manager, at [email protected]. Questions received by the City, including responses, will be consolidated and posted on the City website. The deadline for submitting questions is 2:00 pm PST March 28, 2025. Material changes, if any, to the Request for Proposal will be addressed by written addendum.

Respondents will provide written acknowledgment of each addendum issued with their proposal submission. Oral explanations will not be binding. No clarifications, interpretations or addenda may be issued after 5:00 pm PST on April 04, 2025. It is the sole responsibility of the respondent to check the City website to determine if an addendum has been posted.

Estimated Timeline
RFP Release Date 3/26/2025
Questions Due 4/11/2025, 2:00 PM PST
Clarifications/Addenda Issued 4/18/2025
RFP Response Submittal 05/01/2025 2:00 PM PST
Possible Interviews 05/122025
Evaluation Complete 05/15/2025
Contract Award 05/20/2025
Note: Timeline is an estimate only. The City reserves the right to change the dates listed.

PROPOSAL PREPARATION
Your proposal should highlight the experience, qualifications and competencies of your firm, and of the particular staff to be assigned to this project. It should also specify a detailed approach that will meet the Request for Proposal (RFP) requirements.

The proposal should include:
• Title Page showing the Request for Proposal subject; the firm’s name; the name, address, and telephone number of the contact person; and the date of the proposal.
• Signed Transmittal Letter briefly stating the firm’s understanding of the work to be done; a commitment to perform the work throughout the contract period (including option renewals); and, the name of the person authorized to represent the firm, title, address, email and telephone number.
• Cost information should be submitted separately as indicated in the Cost Proposal instructions.
• Your proposal should be prepared simply and economically, providing a straightforward, concise description of the firm’s capabilities to satisfy the requirements of this Request for Proposal. Please refrain from submitting superfluous literature, promotional material or sales brochures with your response.

While additional information may be presented, the following subjects must be included. They represent the criteria against which the proposal will be evaluated.

1. Authorized to Practice in California
An affirmative statement must be included verifying the firm and all assigned key professional staff are properly licensed and/or authorized to practice in California.

2. Independence
The firm must provide an affirmative statement that it is independent of the City of San Juan Bautista and no member of the proposed project team, or family member, is an employee of the City.

2.1 The firm must provide an affirmative statement that it is independent of the City. The firm should also list and describe the firm’s professional relationships involving the City for the past five (5) years, together with a statement explaining why such relationships do not constitute a conflict of interest relative to performing the services required by this RFP. In addition, the firm shall give the City written notice of any professional relationships entered into during this period of this agreement.

3. Firm Qualifications and Experience
The firm must have extensive experience in the Scope of Services described herein.

The proposal should include the size of the firm and the geographic location of the office from which the work on this engagement is to be performed. Include the firm’s organizational chart (block diagram).

4. Project Understanding
Consultant’s proposal that adequately demonstrate an understanding of the project and familiarity with the project area, requirements, and constraint(s) for the project.

Additionally, identify any “critical issues,” and other elements of concerns to the project such as addressing utility relocations and coordination with other agencies as identified in the scope of work.

5. Project Work Plan & Approach
Present a well-developed approach to the Scope of Work, including procedures, methodologies, measures of effectiveness, organization, and scheduling of tasks to be performed as well as a statement outlining the anticipated involvement of City staff, as outlined in the Scope of Work (Attachment A). Describe the proposed approach for addressing the required services and the firm’s ability to meet the City’s schedule, outlining the approach that would be undertaken in providing the requested services. Additionally, identify approaches to resolve potential critical issues and other elements of concern.

Proposers are encouraged to suggest technical or procedural innovations that have been used successfully on similar projects and optional services that may be used for the benefit of this Project.

Proposers are encouraged to suggest technical or procedural innovations that have been used successfully on similar projects and optional services may be used for the benefit of this Project. Proposers shall specify anticipated CEQA determination.

6. Project Schedule
Propose a time schedule, including a description of the ability of the proposer to perform services within the proposed time frame identified in the Scope of Work (Attachment A) while providing a quality product. Proposers shall include as part of their proposal package a detailed project schedule listing the consultant services identified in the detailed scope of services and the time required to complete each of the specified tasks. Provide a detailed Gantt chart schedule showing tasks, subtasks, and milestones.

7. Partner, Supervisory and Staff Qualifications & Experience Identify the principal supervisory and management staff, including engagement partners, managers, other supervisors and specialists who would be assigned to this project. Indicate the staff to be employed in this engagement on a full-time basis; and, on a part-time basis. Include resumes indicating specialized training, professional certifications and licenses.

Provide information on the government experience of each person, including information on relevant professional education and membership in professional organizations. Indicate steps your firm takes to maximize consistent assignment of your staff over the term of the agreement.

8. Similar Engagements with Other Government Entities
For the firm’s staff that will be assigned responsibility for this project, list three (3) to five (5) completed engagements similar to the work described in this Request for Proposal. California Public Agency experience is desirable. Indicate the scope of work, date, engagement partners, total hours, and the name and telephone number of the principal client contact.

The City reserves the right to contact any or all of the listed references regarding services performed by your firm.

9. Litigation and Claims
Respondent shall disclose any lawsuit, litigation or arbitration resulting from:
(a) Any government engagement where litigation is still pending or has occurred within the last five (5) years; or,
(b) Any type of project where claims or settlements were paid by your firm or its insurers within the last five (5) years.

Describe circumstances and outcome for any incident disclosed.

Pre-Award Expenses
Pre-award expenses are defined as costs incurred by the respondent in:

1. Preparing its proposal in response to this RFP;

2. Submitting its proposal to the City;

3. Negotiating with the City on any matter related to the proposal; or,

4. Any other expenses incurred by the respondent prior to date of the award.

There is no expressed nor implied obligation for the City to reimburse pre-award expenses incurred in the preparation of a proposal. Furthermore, the proposals received shall become the property of the City and will not be returned.

Cost Proposal
The Cost Proposal should contain detailed pricing relative to performing the Scope of Services as described in this Request for Proposal. Itemize regular hourly rates, overtime hourly rates, and callback hourly rates by job classification.

Hourly rates shall contain all direct and indirect costs, including out-of-pocket expenses, and may be used for additional work that may be required.

The Cost Proposal shall be submitted in a separate, sealed envelope; or, as a separate file if submitted via email.

Billing shall be made on a monthly basis. Interim billings shall cover a period of not less than a calendar month. The City shall pay only for productive hours spent on Job Tasks.

Note: Any supplemental fuel charges; energy surcharges; required licenses, training, travel, insurance and bond costs; pandemic-related and Personal Protective Equipment (PPE) expenses will not be allowed.

PROPOSAL SUBMITTAL
One (1) signed original and one (1) copy of the proposal must be submitted to the City of San Juan Bautista, 311 Second Street, San Juan Bautista, CA 95202 no later than 04/17/2025 at 2:00 PM, PST. Proposals shall be submitted in a sealed envelope clearly marked with proposal name and number. Email submission may be made in lieu of mailing a hard copy of the proposal to: [email protected] There will be no public bid opening.

Late Proposals
Proposals arriving after the specified date and time shall not be considered, nor will late proposals be opened. Each prospective respondent assumes responsibility for timely submission of their proposal.

Withdrawal or Modifications of Proposals
Any proposal may be withdrawn or modified by written request signed by the respondent and received by the City prior to the final time and date for the receipt of proposals. Once the deadline is past, respondents will be obligated to fulfill the terms of their proposal.

Confidential Information
Any information deemed confidential or proprietary should be clearly identified by the respondent as such. It may then be protected and treated with confidentiality only to the extent permitted by state law. Otherwise, the information shall be considered a public record. Information or data submitted with a proposal will not be returned.

Proposal Acceptance and Rejection
The City reserves the right to accept any proposal, reject any and all proposals, make a partial award, make multiple awards, call for new proposals, or dispense with the proposal process in its entirety. Furthermore, the City may waive any minor deficiencies or technicalities in proposals received.

SCOPE OF SERVICES
This project will provide a new source of drinking water to the City of San Juan Bautista (City). The City needs additional capacity to meet current and future demands for a system that relies on multiple groundwater wells. The existing wells have had high levels of nitrate and hardness and are not a reliable source of drinking water.

A new 12” transmission pipeline from the San Benito County Water District’s (District) West Hills Water Treatment Plant (WHWTP) to the City is proposed to be constructed along HWY 156 to the City’s water system near the Well No. 6 treatment system. The goal of this transmission pipeline is to improve water reliability and provide additional capacity for the City system.

A Basis of Design Report was submitted in 2021. Since the previous report was submitted, the District requested changes to the pipeline alignment. HDR provided a Basis of Design Report Update (BOD) dated August 9, 2024 (Attachment 1). This report provides a summary of updated right-of-way assessment, alternative alignment analysis, methods of construction, chemical stabilization, hydraulic analysis, and a cost estimate for a revised pipeline alignment. A portion of the pipeline trench will incorporate a conduit for broadband communication. This report will be used for the design parameters. Any changes will need to be documented and verified including any chemical treatment or stabilization.

The consultant will perform all engineering and project management related work necessary to prepare plans and specifications suitable for Public Works bidding per the details of the BOD, and this RFP and its appendices.

Consultant services shall include, but are not limited to: Project management, preliminary design, design development, permitting, bid documents, bidding support, and construction support services, as further detailed below:

A. Project Management
The consultant will be the primary responsible party for managing the project’s schedule and consultant contract budget. In addition, the consultant is expected to attend a monthly progress meeting and prepare action item logs for subsequent follow-up. Additional meetings include kickoff, preliminary design, 60%, 90%, 100% review and lesson learned meetings. The consultant is expected to maintain frequent and timely communication with City staff throughout the duration of the project. Additional coordination will be needed with Caltrans, the County, and the District.

All project schedules shall be prepared in Gantt chart format, utilizing Microsoft Project software. Three weeks for each City review of submitted design package shall be included. Schedule updates shall be provided at all progress meetings.

Consultant’s own team shall perform quality assurance/quality control (QAQC) over work products prepared for the City. A statement of peer review will be required for overall constructability, coordination, and reasonable reduction in errors and omissions.

The total project budget, including both design and construction with the contingencies, is financed with EPA Grant. The guidelines for the grant award are in Attachment 2 “Congratulations on Your U.S. EPA Region 9 Grant Award”.

Consultant is expected to communicate often and early with respect to the schedule and budget.

B. Preliminary Design
Preliminary Design phase shall include a technical memo, a field or topographic survey, base mapping, utility locating and coordination, conceptual design and provision of horizontal alignment options, preliminary cost estimate and project schedule with each option. The technical memo shall be provided to summarize the design options, outlining pros and cons for each option, and evaluation of C.3 requirements for regulated projects. Additionally, a draft notification for the proposed pothole work shall be included as needed, Right of Way evaluations, geotechnical investigation needed, and other tasks as recommended by the proposer.

Field surveys shall include but not be limited to the following:
• Horizontal locations of existing valve cans in the roadway, in addition to top of valve nut elevations, to assist in estimating elevations of existing water pipes. • Horizontal locations of utility potholes (Survey files shall be updated following completion of pothole investigation work).
• Horizontal locations of any visible and accessible sewer cleanouts up to 20 feet behind back of walk, or further away where easily accessible. Full manhole data at all manholes in the roadway, and any visible and accessible drop inlets up to 20 feet behind back of walk. Manhole / DI data to include elevations of rim and inverts of all connected pipes. Pipe data shall include whether they flow in or out, and their compass direction such as S., NW, etc.
• Above ground utility boxes and underground vaults, including designation of whether they are water-related or not.
• Water meter box and fire backflow preventer locations, including for meters and fire BFPs that may be some distance behind back of walk. For fire BFPs, survey shall designate their size, the size of their lateral, their detector meter number, and whether they are aboveground or in a vault.
• Accurate depictions of features on private property shall extend up to 20 feet behind back of walk, or extend to existing water meter boxes and fire BFPs, whichever is further. These features include but are not limited to hardscape walkways, landscaped areas, any trees, walls, etc.
• Approximate right-of-way boundary locations shall be shown in relation to the proposed improvements for reference.

C. Environmental Constraints and Permitting
At this juncture, it is unclear what level of environmental documentation is needed as the scope is not fully settled without engineering analysis performed. Preliminary analysis has been conducted with the BOD in Attachment 1. With the potential federal funding source CEQA and NEPA analysis will be required. As this is a new alignment and system. The Consultant will determine the level of environmental permitting needed for this project and develop all the documentation needed. For the purpose of the environmental documentation and design, this new pipeline will connect to the existing system at the West Hills WTP. This will also include any permitting needed with State or Federal agencies.

Additional permits may be required with Caltrans, County of San Benito, City of Hollister, or other agencies.

D. Design Development
Consultants shall be the Engineer of Record and responsible for design and preparation of complete plans and technical specifications for the project. The consultant must perform an adequate field investigation to confirm existing conditions.

All work is to comply with all applicable rules, regulations, code, law, and good practice for public facilities. When possible, the Consultant shall incorporate “green” building/construction practices, sustainability, energy efficiency, and low operations and maintenance costs into recommendations and subsequent design.

Use of contractors, and all applicable subcontractors which are required to pay prevailing wages, requires registration with the State of California, Department of Industrial Relations (DIR) through the Public Works Contractor Registration Program (PWC Registration) before bidding, being awarded, or performing work on public works projects in California. This includes those performing surveying work, material testing, inspection, trucking, boring, potholing, concrete deliveries and temporary service companies who provide workers to prevailing wage contractors.

Plans and specifications shall provide sufficient detail to result in a good quality product while allowing competitive pricing where possible and appropriate, and provide options to the contractor where appropriate to obtain the same good level of quality for the best bid price. Plans and specifications shall not specify proprietary products or services. Specifications shall be prepared in CSI 2020 format or approved format.

Consultant shall be responsible for development of environmental documentation as warranted by the Project. Coordination and preparation of documentation to facilitate permits and outreach with utility companies including PG&E, regulatory agencies such as the State Water Resources Control Board - Division of Drinking Water (DDW), and other stakeholders will also be the responsibility of the consultant. Coordination with DDW shall be an optional service and, if necessary, be initiated at the 90% design stage for concurrence on proposed design exceptions.

The Consultant shall obtain any necessary encroachment permits. If any of the agencies require that the design includes traffic control plans, these plans shall be prepared by the Consultant.

Surveying, utility locating (e.g. GPRS services), and selective potholing of existing utility crossings prior to design of water line profile, shall be included in this scope (up to forty (40) potholes). Provide the unit price of potholing. Additional potholes may be proposed as an optional service (if applicable). Potholing shall include any necessary soil testing for disposal classification of construction spoils for offhauling to landfill, groundwater elevations for shoring and dewatering requirements, existing pavement thickness information, note the presence of any pavement fabric, and backfilling and patching the pavement. Traffic control plans shall also be included where proposed pothole locations are within roadway lanes and/or shoulders.

All submittals shall include hard copies (number specified below) and digital copies (PDF and native format) of all documents.

1. Preliminary Design: Submit a PDF set of 24” x 36” plans and supporting documents:
a. 30% plans: Cover sheet and plan sheet with main alignment, base mapping and preliminary details.
b. Cut sheets for equipment/appurtenances.
c. Documentation of outreach with franchise utility companies for facilities needed to be relocated or adjusted to grade as a result of the proposed construction activities.
d. Project schedule update.
e. 30% construction cost estimate.
f. Table of Contents list for technical specifications. g. Proposed Pothole Location Exhibit

2. 60% Submittal: All major issues have been resolved prior to this stage. The intent of this submittal is to provide plans and project documents in sufficient detail to allow for thorough and complete review. Submit a PDF set of 24” x 36” plans and supporting documents.
a. 60% Plans: All subcontracted work shall be accounted for in this submittal.

All project details and pothole information have been accounted for and incorporated.
• Updated field survey file to include all pothole locations. b. 60% specifications:
• Technical specifications
• Special Provisions, with recommended changes in track changes format. The Special Provisions shall also include the following:
o Bid item descriptions and measurement and payment provisions o A list of minimum required submittals during construction o List of information available to Bidders, with disclaimer o A table listing all material testing and associated responsibility o A table list of materials requiring warranties, and associated warranty periods
c. Project schedule update.
d. 60% construction cost estimate in the form of the bid schedule. e. Utility conflicts have been resolved or a timeline for resolution of issues has been determined.
f. CEQA Exemption documentation, suitable for filing at the County Recorder’s Office.
g. Responses to the City’s review comments on the 30% submittal, along with return of mark- ups.
h. Other supporting documentation as necessary, including, but not limited to, documentation of DDW package submittal, SWPPP, list of information available to Bidders, etc.

3. 100% Submittal: All issues, prior comments, and concerns must be addressed in this submittal. DDW letter of acceptance has been obtained, if applicable.

Submit a PDF set of 24” x 36” plans and supporting documents. a. 100% plans
• Peer review shall have been accomplished by this stage, with the statement and signature on the cover sheet. The professional shall sign, date, and seal the following Certification of Peer Review on a letterhead document with the transmittal of the final plans and specifications:
“The undersigned hereby certifies that a professional peer review of these plans and the required designs was conducted by me, a professional engineer with expertise and experience in the appropriate fields of engineering equal to or greater than the Engineer of Record, and that appropriate corrections have been made.”
b. 100% specifications
• Reviewed bid instructions
• Finalized technical specifications
• Finalized Special Provisions
c. Project schedule update
d. 100% construction cost estimate and bid schedule.
e. Responses to the City’s review comments on the 75% submittal, along with return of mark- ups.
f. DDW letter of acceptance, if applicable.
g. Other supporting documentation as necessary.

E. Bid Package
The bid package shall be finalized upon incorporation of the City’s final comments from the 100% submittal. Submit hard copies and digital format (PDF and native format) of each of the documents listed below:

1. One digital copy of full-sized plans (24” x 36”), stamped and signed on each sheet by the Engineer of Record and by discipline. a. An optional service to provide one hard copy of the full-sized plans should be included in the fee proposal.

2. One digital copy of the specifications.
a. Special Provisions
b. Technical specifications, with cover sheet stamped and signed by all necessary disciplines.

3. Final project schedule update.

4. Final construction cost estimate and bid schedule.

F. Bidding Services
Consultant will respond to all bidder’s requests for information (RFIs) and support the City’s coordination efforts to inform plan-holders of significant responses to RFIs and prepare addenda as necessary. During bidding, all proposers’ communications will be directed through the City’s Purchasing Officer.

If addenda to bid documents are extensive and are as a result of consultant’s work product, conformed documents shall be prepared at no expense to the City. City will provide reproduction services.

G. Design Support Services During Construction
The City’s construction management team will have primary responsibility for construction management and inspection. The consultant’s point of contact will be the City’s construction manager, not the contractor.

The following is a minimum list of services and submittals required.

1. Attend and prepare information for an internal handoff meeting from the design team to the construction management team. Consultant shall be prepared to address:
possible construction pitfalls, items for the construction management team to be aware of (special working hours, shortened timelines for submittal reviews, etc.).

2. Attend the pre-construction meeting.

3. Attend up to three (3) periodic construction progress meetings.

4. Participate in the final inspection and development of punch lists.

5. Respond to RFIs, which includes clarifying or providing revisions or additional detail where necessary on the plans and specifications. Response to RFIs shall be timely in order to avoid construction delays and claims.

6. Review and respond to all submittals within the period allocated in the contract documents and as necessary to avoid construction delays and claims.

7. Review proposed substitutions, if any, for conformance to plans and technical specifications.

8. Review and make recommendations on proposed changes to the contract (Request for Quotations and Contract Change Orders).

9. Prepare Record Drawings based upon red-lines provided by the contractor and field reviews. All changes shall be indicated in red and clouded. All plan sheets shall be stamped with red “Record Drawings” stamp. The stamp shall include Engineer of Record Company Name, name of Engineer of Record, date of the Record Drawing update, and standard disclaimer. The Record Drawings shall be prepared digitally, using AutoCAD. Final Record Drawings shall be submitted electronically, in PDF and CAD format.

Independent Contractor Respondent understands that they are an independent contractor, and not an employee of the City of San Juan Bautista. In addition, personnel performing work under this agreement shall be direct employees of the contractor. At no time shall contractor, nor contractor’s employees, represent themselves as City staff.

SELECTION PROCESS
Proposals will be evaluated based upon, but not limited to, the following criteria (not listed in order of importance):

1. Project methodology and approach

2. Firm’s standing and capability to provide the required services

3. Qualifications and experience of firm and the personnel named in the proposal

4. Technical expertise and resources

5. Past performance on governmental engagements on similar projects, based on client references and other verifiable information

6. Overall cost
Proposals will be reviewed and evaluated by the City. Oral interviews of the most responsive firms may be scheduled shortly after the deadline submission date and may be conducted remotely or by phone at the option of the City.

The City reserves the right to award a contract based on proposal submittal only, without benefit of an oral interview.

Ranked Responses
The City shall rank, in the order of preference, two or more offerors whose professional qualifications and proposed services are deemed most meritorious. Negotiations shall then be conducted, beginning with the offeror ranked first. If a contract satisfactory and advantageous to the City can be negotiated at a price considered fair and reasonable, the award shall be made to that offeror. Otherwise, negotiations with the offeror ranked first shall be formally terminated and negotiations conducted with the offeror ranked second, and so on, until such a contract can be negotiated at a fair and reasonable price.

The City reserves the right to make multiple awards as a result of this solicitation.

Evaluation Criteria
The following weighting and points will be assigned to this Request for Proposal for evaluation purposes:

CRITERIA MAX POINTS
Project Understanding 20
Work Plan and Approach 35
Qualifications of Personnel 15
Experience and Resources 20
Past Performance/References 10
Total 100
Award
Award of contract will be made as may be in the City’s best overall interest. Award will be made to the lowest, responsive and responsible respondent(s) who, in the City’s sole judgement, has the necessary experience, skill, business standing, equipment, staffing, and financial stability to provide professional civil engineering services.

Accordingly, the City reserves the right to award one or more contracts based on professional qualifications and areas of expertise.

KEY PERSONNEL
If the City, in its sole discretion, is dissatisfied with the contact person or the person or persons actually performing services, then the consultant will recommend a different person or persons to be designated as the contact person or to perform required services.

The City reserves the right to terminate, without penalty, any contract awarded under this Request for Proposal when key personnel identified are not available. Substitution may only occur with advance explicit approval of the City. Substitute personnel must have equal or greater education and experience.

It is further understood that respondent, and its employees, in performing the required services of this RFP, operate as an independent contractor and not as an employee or agent of the City.

Note: Subcontracting of any services required under this Request for Proposal is prohibited unless pre-authorized by the City Manager, or designee.

FAITHFUL PERFORMANCE BOND
Successful respondent may be required to furnish the City with a surety bond conditioned upon the faithful performance of the contract. This may take the form of a bond executed by a surety company authorized to do business in the State of California and approved by the City, an endorsed Certificate of Deposit, or a money order or a certified check. The bond shall be in a sum equal to one hundred percent (100%) of the amount of the first year of the contract price.

INSURANCE
Respondent shall provide proof of Commercial Liability and Property Damage Insurance prior to performance of duties. Coverage shall be from a company authorized to transact business in the State of California and shall be in an amount not less than $5,000,000 combined single limit (CSL). The City shall be named as an additional insured and thirty (30) days notice of cancellation shall be indicated.

Professional Liability coverage in an amount not less than $2,000,000 per occurrence is required.

Automobile Liability coverage in an amount not less than $1,000,000 per accident for bodily injury and property damage is required.

Worker’s Compensation coverage in an amount not less than $1,000,000 per claim for each employee engaged in work on City premises is required.

Respondent is solely responsible for all insurance premium payments.

BOND/INSURANCE SUBMITTAL
Within ten (10) consecutive calendar days after the notice of award is issued, the respondent to whom a contract is awarded shall deliver to the City bonds and insurance in the form and amounts authorized by the City as outlined in the RFP documents.

INDEMNIFICATION
Respondent shall defend, indemnify, protect and hold harmless the City, its elected and appointed officers, employees, and agents, from and against all claims for damages, liability, and expenses (including attorney’s fees) arising out of this agreement and/or respondent’s performance hereunder, except as to such damages, liability, and expenses due to the sole negligence or willful acts of the City, its officers, employees or agents.

TERMINATION
The City may terminate this agreement and be relieved of any consideration to the respondent should respondent fail to perform in the manner required. Furthermore, the City may terminate this agreement for any reason without penalty upon giving thirty (30) days written notice to the respondent. In the event of termination, the full extent of City liability shall be limited to an equitable adjustment and payment for materials and/or services authorized by and received to the satisfaction of the City prior to termination.

PROTESTS
Protests by unsuccessful respondents to the selection for award shall be submitted in writing to the City Manager no later than five (5) business days after award recommendation. Failure to submit a timely written protest to the City Manager shall bar consideration of any such protest.
a) The written protest shall state in detail the specific facts and law or ordinance upon which the protest of the proposed award is based and shall include all pertinent documents and evidence.
b) A written protest may not challenge the relative weight of the evaluation criteria or formula for assigning points.
c) Only a respondent whose proposal is timely received and fully complies with all terms and conditions of the Request for Proposal may protest an award. d) Any and all costs incurred by a protesting party in connection with the protest of a solicitation shall be the sole responsibility of the protesting party.

The City Manager shall evaluate the protest and issue a written decision within five (5) business days after receipt of the protest. The protester shall be notified if additional time is needed to adequately investigate the claim. During the evaluation process, the City may, at its sole discretion, suspend further action on the solicitation, or proceed with an award.

The decision of the City Manager for contract awards valued at $50,000 or less shall be final. For awards exceeding $50,000, an unsuccessful respondent shall have the right to appear before the City Council to protest any award requiring Council approval.

NO COMMITMENT TO AWARD
Issuance of this RFP and receipt of proposals does not commit the City to award a contract. The City expressly reserves the right to postpone proposal opening for its own convenience, to accept or reject any and/or all proposals received in response to this RFP, to negotiate with more than one respondent concurrently, or to cancel all or part of this proposal.

The City further reserves the right to negotiate material aspects of proposals received, including costs, services and scheduling, when determined to be in the best overall interest of the City.

OWNERSHIP OF WORK PRODUCT
All reports, studies, information, data, forms, designs, plans, procedures, systems and any other materials or properties produced for this project shall be the sole and exclusive property of the City. No such materials or properties produced, in whole or in part, shall be subject to private use, copyrights, or patent rights by respondent without the express written consent of the City.

NON-ENDORSEMENT
As a result of the selection of a respondent to provide services; the City is neither endorsing nor suggesting that the respondent’s services are the best or only solution.

Respondent agrees to make no reference to the City in any literature, promotional material, brochures, sales presentation or the like without the express written consent of City.

GOVERNING LAW
This Agreement shall be governed by the laws of the State of California. Venue shall be the County of Monterey.

COMMENTS/EXCEPTIONS
Respondents are responsible to become familiar with all instructions, terms, conditions, and contract documents governing this Request for Proposal, including the City’s standard Consultant Services Agreement, a copy of which is available upon request.

Submission of a proposal will be considered specific evidence of having performed the above.

Successful respondent shall be required to sign the City’s standard Consultant Services Agreement prior to commencement of work. Please note any comments or exceptions with your submittal. Once the award has been made, failure to have read all the terms, conditions, and specifications of this RFP shall not be cause to alter the original proposal nor to request additional compensation.

Note: Excessive and/or material exceptions to the RFP may be cause for the rejection of your proposal.

ATTACHMENT 1: Basis of Design Report Update - San Juan Bautista Transmission Pipeline
HDR
August 9, 2024
Basis of Design
Report Update
San Juan Bautista Transmission
Pipeline
Hollister, CA
August 9, 2024
San Benito County Water District | San Juan Bautista Transmission Pipeline Table of Contents
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i
Table of Contents
Objectives.................................................................................................................................. 1 Preliminary Investigations .......................................................................................................... 1 Right-of-Way and Easements................................................................................................. 1 Utility Investigation.................................................................................................................. 4 Geotechnical Investigation...................................................................................................... 4 Topographic Survey ............................................................................................................... 4 Water Quality.......................................................................................................................... 4 City of San Juan Bautista Water System............................................................................. 4 West Hills Water Treatment Plant ....................................................................................... 5 Environmental Constraints and Permitting.............................................................................. 5 Design Standards ...................................................................................................................... 6 Pipe and Valves ..................................................................................................................... 6 Road Work ............................................................................................................................. 7 Water and Sewer Separation.................................................................................................. 7 Hydraulics .................................................................................................................................. 7 Flow Monitoring and Control................................................................................................... 9 Construction Methods ................................................................................................................ 9 Trench Installation............................................................................................................... 9 Trenchless Installation .......................................................................................................10 Chemical Stabilization...............................................................................................................14 Pipeline Alignment ....................................................................................................................15 Alternative Analysis ...............................................................................................................15 Segment 1A – WTP On-Site ..............................................................................................15 Segment 1B – WTP On-Site ..............................................................................................16 Segment 2A – Access Road ..............................................................................................19 Segment 2B – Private Property..........................................................................................19 Segment 3 – Union Road And San Juan Hollister Road.....................................................22 Environmental Alternative Analysis ....................................................................................22 Alternative Recommendation .............................................................................................24 Segment 4 – Highway 156 (Future Frontage Road)...............................................................26 Segment 5 – Connection to San Juan Bautista......................................................................26 Class 4 Cost Estimate...............................................................................................................29 San Benito County Water District | San Juan Bautista Transmission Pipeline Table of Contents
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ii
List of Figures
Figure 1: Transmission Pipeline Overall Alignment .................................................................... 2 Figure 2: Union Road Encroachment and Existing Easement for Hollister Conduit .................... 3 Figure 3: Hydraulic Grade Line Maximum Day (367 gpm, 99 psi at Connection)........................ 9 Figure 4: Horizontal Directional Drilling (HDD) ..........................................................................11 Figure 5: Auger Boring..............................................................................................................12 Figure 6: Microtunneling............................................................................................................12 Figure 7: Segment 1A Pipeline Plan..........................................................................................17 Figure 8: Segment 1B Pipeline Plan..........................................................................................18 Figure 9: Segment 2A Pipeline Plan..........................................................................................20 Figure 10: Segment 2B Pipeline Plan........................................................................................21 Figure 11: Segment 3A Pipeline Plan........................................................................................25 Figure 12: Segment 4 Pipeline Plan..........................................................................................27 Figure 13: Segment 5 Pipeline Plan..........................................................................................28 List of Tables
Table 1: Summary of Utilities in the Project Area ....................................................................... 4 Table 2: City of San Juan Bautista Water Quality Data .............................................................. 5 Table 3: West Hills Water Treatment Plant Water Quality Data.................................................. 5 Table 4: Special-Status Species with the Potential to Occur in the Project Area ........................ 6 Table 5: City of San Juan Bautista Flow Demands..................................................................... 8 Table 6: Hydraulic Design Criteria.............................................................................................. 8 Table 7: Segment 1A – WTP On-Site Challenges and Solutions...............................................15 Table 8: Segment 1B – WTP On-Site Challenges and Solutions...............................................16 Table 9: Segment 2A – Access Road Challenges and Solutions...............................................19 Table 10: Segment 2B Private Property Challenges and Solutions ...........................................19 Table 11: Segment 3A – Union Road and San Juan Hollister Land Challenges and Solutions..22 Table 12: Permitting Requirements and Recommendations......................................................23 Table 13: Segment 4 – Highway 156 (Future Frontage Road) Challenges and Solutions .........26 Table 14: Segment 5 – Connection to San Juan Bautista Challenges and Solutions ................26 Table 15: Class 4 OPCC...........................................................................................................30 Appendices
Appendix A – Basis of Design Report (2021)
San Benito County Water District | San Juan Bautista Transmission Pipeline Objectives
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1 Objectives
This project will provide a new source of drinking water to the City of San Juan Bautista (City).

A new transmission pipeline from the San Benito County Water District’s (District) West Hills Water Treatment Plant (WHWTP) to the City is proposed to be constructed along HWY 156 to the City’s water system near the Well No. 6 treatment system. The goal of this transmission pipeline is to improve water reliability and provide additional capacity to the City system.

A Basis of Design Report was submitted in 2021. Since the previous report was submitted, the District requested changes to the pipeline alignment. This report provides a summary of updated right-of-way assessment, alignment alternatives analysis, methods of construction, chemical stabilization, hydraulic analysis, and a cost estimate for a revised pipeline alignment.

Preliminary Investigations
Right-of-Way and Easements
The overall alignment of the pipeline is shown in Figure 1. As described in more detail in the Pipeline Alignment section, Alternative A shows the pipeline alignment through existing District easements on the WHWTP Access Road as it leaves the WHWTP and will require an encroachment permit from San Benito County (County) along Union Road. An encroachment permit is required along Union Road in County right of way (ROW). The pipeline is proposed to be under the northern shoulder (outside the west-bound lane), see Figure 2.

The Subsystem 10 raw water system (including the Hollister Conduit) provides raw water to the WHWTP and provides an existing easement for the transmission pipeline to follow once in the agricultural area for about 2,000 feet. The remainder of the alignment in the agricultural area will require a new easement.

The alternative pipeline alignment, Alternative B, will require new private easements from at least four owners once it leaves the WHWTP, until the alignment connects to the existing 12” City of Hollister water line. The new pipeline alignment continues along Mitchell Road and requires another County encroachment.

The two alternative alignments converge where before crossing Hwy 156 in the existing 12” City of Hollister water line. The alignment in Hwy 156 is currently in the Caltrans ROW but will be transferred to County ROW once the construction of the new Highway 156 is completed. This portion of the alignment will require a County encroachment along the frontage road and where the alignment turns down Mission Vineyard Road to connect to the City system.

Private property will need to be acquired near the City’s Well 6 to house the orthophosphate dosing system, control valve, and flow meter vault, if these cannot fit in the well site.

MISSION

VINEYARD ROAD

HOLLISTER
WEST
HILLS
WTP HWY 156 WELL NO. 6

SAN JUAN

BAUTISTA
LEGEND

TREATED WATER TRANSMISSION PIPELINE

TREATED WATER TRANSMISSION PIPELINE - ALT B
SUBSYSTEM 10 RAW WATER PIPELINE

HOLLISTER CONDUIT RAW WATER PIPELINE

EXISTING ACCESS ROAD EASEMENT
EXISTING SUBSYSTEM 10 EASEMENT

COUNTY ENCROACHMENT

FUTURE COUNTY ENCROACHMENT

NEW PRIVATE EASEMENT ACCESS ROAD

UNION ROAD
San Benito County Water District | San Juan Bautista Transmission Pipeline Preliminary Investigations
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3 Figure 2: Union Road Encroachment and Existing Easement for Hollister Conduit PROPOSED 12”

TRANSMISSION PIPELINE

UNDER SHOULDER
(ALTERNATIVE A)
San Benito County Water District | San Juan Bautista Transmission Pipeline Preliminary Investigations
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4 Utility Investigation
The utilities in the area are summarized in Table 1. Letters have been sent to the utilities requesting their alignments and potential conflicts. Once their responses are provided the utility alignments will be included in the detailed design.

Table 1: Summary of Utilities in the Project Area
Company Utility Type
Charter Communications Communications
Lumen Communications
AT&T Communications
PG&E Electric/Gas
City of San Juan Bautista Water, Sewer, Storm Drain
Geotechnical Investigation
The geotechnical investigation for this project phase included a conceptual desktop study based on previous geotechnical reports and any available information on the area. The draft conceptual geotechnical study is included as Appendix A. The results from the study have been used to inform the design criteria of this report. This study should be followed up with borings, testing, and a more detailed geotechnical report in the next phase of design.

Once a final alignment is agreed upon, a new survey will need to be performed to include easements, property lines, and boundary work.

Water Quality
City of San Juan Bautista Water System
According to the City Water Master Plan (2020), the existing groundwater wells produce very hard water (greater than 300 mg/L as CaCO3) and, as a result, many of the City’s residents have installed domestic self-regenerating water softeners to provide local treatment. The water quality data currently being monitored at the City wells are provided in Table 2. As stated in the Master Plan, the City currently uses Well No. 1 as their primary water source for much of the year because Well No. 5 requires additional iron and manganese treatment prior to distribution, and Well No. 6 has been taken off-line due to high nitrate levels. The City is currently implementing a nitrate treatment project to address the issue.

San Benito County Water District | San Juan Bautista Transmission Pipeline Preliminary Investigations
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5 Table 2: City of San Juan Bautista Water Quality Data Constituent MCL City Well 1
(Raw)
City Well 5
(Raw)
City Well 6
(Inactive)
pH 6.5 – 8.5 6.7 – 8.0 7.5 7.7 – 8.1
Hardness as CaCO3 (mg/L) - 353 – 485 321 334 – 371
Alkalinity as CaCo3 (mg/L) - 278 – 360 320 380
Notes:

1. Source: City of San Juan Bautista Water Master Plan (November 2020), Akel Engineering

2. MCL = Maximum contaminant level
West Hills Water Treatment Plant
The water quality data from WHWTP provides the constituents that will be found in the transmission pipeline before blending with the City system. WHWTP treated water quality data is provided in Table 3.

Table 3: West Hills Water Treatment Plant Water Quality Data Constituent MCL WHWTP
Effluent
pH 6.5 – 8.5 8.1
Hardness as CaCO3 (mg/L) - 112
Alkalinity as CaCo3 (mg/L) - 66
Source: Safe Drinking Water Information System, California Water Board An increase for future demand plus the high hardness in the City’s wells are the main reasons for blending the City water with WHWTP treated water at a ratio of 15% to 85%, respectively.

This blend ratio is chosen to achieve a hardness of 150 mg/L as CaCO3 as written in the San Juan Bautista Water Supply MOU.

Environmental Constraints and Permitting
As part of the predesign for the original alignment for this project, a preliminary biological constraints and U.S. Fish and Wildlife Service coordination memorandum was prepared. A site visit was conducted on September 24, 2021 to review that original alignment and document areas of concern for potential impacts to sensitive species. Additional environmental concerns for the revised alternative segments are included in the Pipeline Alignment section. No additional environmental assessment was performed for the portion of the alignment along the Hwy 156 frontage road and no additional field assessments were performed.

Table 4 below shows the special-status species with the potential to occur in the Project area, a description of their status, and a designation of which alignments there is a potential of the species to occur in. The different alignment alternatives are defined in the Pipeline Alignment section. These data were obtained from a search of the California Native Plant Society (CNPS) Rare Plant Inventory and California Natural Diversity Database (CNDDB) for the USGS 7.5- minute quadrangle in which the project area occurs and the three bordering quadrangles; Hollister, San Juan Batista, San Felipe, and Chittenden. As the proposed alignments are within such close proximity, there is potential for all wildlife species to occur in both areas. Plant species included in the table only have the potential of occurring in the area of Alternative B.

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6 Table 4: Special-Status Species with the Potential to Occur in the Project Area Common Name Scientific Name
Federal
Status
State
Status
Rare Plant
Rank Project Area
Golden Eagle Aquila chrysaetos BGEPA FP - Alternative A and B Tricolored blackbird Agelaius tricolor - ST - Alternative A and B California tiger
salamander – central
California DPS
Ambystoma
californiense FT ST - Alternative A and B
Crotch’s bumble bee Bombus crotchii - SC - Alternative A and B Monarch butterfly Danaus plexippus FC SSC - Alternative A and B California red-legged
frog Rana draytonii FT SSC - Alternative A and B
San Joaquin kit fox Vulpes macrotis
mutica FE ST - Alternative A and B
Western spadefoot Spea hammondii FPT SSC - Alternative A and B San Joaquin spearscale Extriplex
joaquinana - - 1B.2 Alternative B only
Hall’s tarplant Deinandra halliana - - 1B.1 Alternative B only While all special-status species have the potential to occur in each alternative, the potential impacts resulting from Alternative A would be significantly less. The majority of Alternative A would be constructed within existing roadways and agricultural fields, thereby avoiding potential habitats that could support sensitive species. The amphibians and the kit fox generally utilize undeveloped, unpaved open spaces such as grasslands interspersed between their breeding grounds (e.g. wetlands, ponds, streams, woodlands). Therefore, Alternative B has a higher likelihood to impact suitable breeding and/or dispersal habitats for these listed species.

The two special-status plants species may also occur in the grasslands within the Alternative B alignment and if not avoided could be impacted directly by the removal of individuals or temporary loss of suitable habitat or indirectly by the potential introduction of dust, sedimentation, and/or nonnative invasive plant species. These indirect impacts may affect suitable or occupied habitats by sensitive plant species adjacent to Alternative B work areas during and/or after construction.

Design Standards
Pipe and Valves
The 12” diameter pipe will be iron pipe size (IPS) high-density polyethylene (HDPE) standard dimensional ratio (SDR) 13.5, 160 psi, conforming to AWWA C906 which contains the standards for polyethylene pressure pipe from 4 inches to 65 inches. All HDPE joints will be restrained. Thrust blocks may be required at connections to existing pipelines, these locations will be evaluated further during detailed design.

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7 AWWA C900 PVC (DR 25 or stiffer) could be considered during design based on cost and constructability. Thrust restraint will be more considerable for PVC than HDPE. It is recommended to use thrust blocks over the use of restrained mechanical couplings with gripping wedges.

Isolation valves will be provided at the tie-in locations at either end of the alignment and spaced every mile along the pipeline for easy isolation in case of repairs. These isolation valves will be 12” diameter butterfly valves complying with AWWA C504.

Any high points or low points along the alignment will be configured with air release valves or blow offs, respectively. These locations, sizing, and installation details will be developed during detailed design.

Road Work
Road resurfacing and traffic control design will follow County standards to meet the requirement of the encroachment permit.

The project will follow the 2023 CalTrans Standard Specifications for general construction traffic control. Traffic control will be needed for trenching of the pipeline under roadway shoulders.

During construction, it is likely that one lane will be completely shut down during working hours.

At the end of each construction day, the contractor will be required to place trench plates over the open trench and reopen the lane to traffic. The contractor will be required to prepare and submit a traffic control plan to the County to be stamped and signed by a registered California engineer.

Water and Sewer Separation
Separation of water and sewer utilities will comply with California Department of Public Health (CDPH) and Division of Drinking Water (DDW) requirements. Typically, 10-foot horizontal and 1- foot vertical separation must be maintained when new potable water lines and raw water or sewer pipelines are aligned parallel and minimum 1-foot vertical separation when crossing perpendicular. However, a variance can be obtained if it can be shown that the potable water utility is adequately protected. The standard which DDW requires is laid out in the California Code of Regulations, Title 22, Division 4, Chapter 16, Waterworks Standards (WWS), Section 64572. It is up to the designer to justify what is considered an upgraded material and how it meets or exceeds the requirements laid out in Section 64572.

Hydraulics
The flow demands for the City system are shown in Table 5 based on the City Water Master Plan (2020). The intent of control of the water is to provide water to a predetermined maximum flow rate and to match demand based on pressure below that maximum.

San Benito County Water District | San Juan Bautista Transmission Pipeline Hydraulics
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8 Table 5: City of San Juan Bautista Flow Demands
Existing Demands
Minimum Month
Average Day
Maximum Day
Supplied by WHWTP
(85%)
Flow (gpm)
110
183
411
349
2035 Demands
Minimum Month
Average Day
Maximum Day
Supplied by WHWTP
(85%)
146
244
549
467
Buildout Demands
Minimum Month
Average Day
Maximum Day
Supplied by WHWTP
(85%)
236
393
884
TBD
The SDR 13.5 transmission pipeline diameter is 12 inches nominal and 10.75 inches inside diameter. Therefore, the minimum velocity is 0.3 ft/s at the existing minimum month (85% of 110 gpm is 93.5 gpm) and the maximum velocity is 1.6 ft/s at 2035 maximum day. While this is a low velocity through the transmission pipeline, the sizing of the pipeline is adequate to maintain the required pressures in the City water system. Pressures at the point of connection to the City system (near the Inactive Well 6 Site) under Maximum Day Demand conditions are as follows:
• Minimum Pressure – 64.8 psi
• Average Pressure – 82.4 psi
• Maximum Pressure – 99.0 psi
The criteria for hydraulic design are provided in Table 6. Bends were assumed to be 90-degrees where needed.

Table 6: Hydraulic Design Criteria
Criteria Unit Value
C-value - 130
Treated Water Storage Tank Elevation ft. MSL 487
90-degree bend K-value - 0.3
Figure 3 shows the hydraulic grade line across the transmission pipeline to maintain the maximum pressure of 99 psi at the connection at maximum day demand (439 gpm). A control valve loss at 310+40 is based on a control valve placed along the pipeline near the new orthophosphate dosing system and existing Well 6 site. Based on these calculations, the maximum working pressure in the pipeline is 114.5 psi.

San Benito County Water District | San Juan Bautista Transmission Pipeline Construction Methods
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9 Figure 3: Hydraulic Grade Line Maximum Day (367 gpm, 99 psi at Connection) As part of final design, it is recommended that a transient analysis be performed. This analysis will help in determining system pressure during a surge event and if any surge relief is required as part of the design, plus will determine flow control valve closing and opening speed to mitigate the effects of transient events.

Flow Monitoring and Control
Flow monitoring is required for regulatory purposes and a control valve is required to ensure the treated water storage tank is not drained. At the area near the City’s Well 6 a vault will contain a flow control valve, flow meter, and chemical injection port. The flow meter power and communications can be routed to the orthophosphate dosing control system or to Well 6, if there is capacity, to communicate with the City’s system. The control valve is a Rate of Flow Control Valve, Cla-Val 40-01 (or equal), that is hydraulically operated and pilot-controlled keeping flow below a preset maximum based on pressure drop across an orifice plate. Based on City demands and preventing cavitation at the valve, the valve will be sized at 6 inches. The valve will fail closed. The flow meter will also be 6 inches to ensure adequate velocity for accurate readings.

Construction Methods
Trench Installation
All trench installation shall be bedded with crushed rock and backfilled with suitable engineered material and/or acceptable native material. The bedding, backfill, and compaction requirements will follow the recommendations of the geotechnical report and follow County standards for trench installation in their roadway.
100
150
200
250
300
350
400
450
500
550
0+00 50+00 100+00 150+00 200+00 250+00 300+00 350+00
Elevation (ft)
STA (ft)
12" Transmission Pipeline
HGL
WHWTP
CITY
Control
Valve
San Benito County Water District | San Juan Bautista Transmission Pipeline Construction Methods
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10 Trenchless Installation
Trenchless construction will be necessary where the pipeline alignment crosses under the future Highway 156. Trenchless may also be utilized in areas where excavation will significantly disturb traffic or commerce or is deep enough that trenching is cost prohibitive.

Trenchless construction will likely be horizontal directional drilling (HDD) or a jack and bore method like auger boring, or pilot tube microtunneling and will require a casing per Caltrans requirements. Per Caltrans Encroachment Permit Manual, a casing should have an inside diameter that is four inches larger than the outside diameter of the carrier pipe, meaning in this project a 16” steel or 20” HDPE casing.

HDD, shown in Figure 4, is a technique used in diameters ranging from 2 in to 65 inches. It is commonly used to install pipelines beneath water bodies or other surface features. Small pits are excavated at the entrance and exit points to facilitate containment of drilling fluids and entry of the pipe during pullback operations. HDD also typically requires room for a long spool of pipe stretched out at the receiving pit for pullback after pilot boring and reaming. The insertion pits do not need to be large or deep as the HDD machine is on the surface, but that means the length of the crossing is typically longer than a jack and bore installation due to the setback required to get to a 10 feet minimum cover under the Highway (required by Caltrans) using an entry angle of 8-16°. The pipe material that is suitable for HDD in this project is HDPE. Caltrans allows for the casing pipe to also be HDPE if using HDD.

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11 Figure 4: Horizontal Directional Drilling (HDD)
Source: North American Society for Trenchless Technology Jack and bore installation is typically used for pipe diameters ranging from 8 in to 72 inches depending on the specific method. Two typical jack and bore installation methods, auger boring and pilot tube microtunneling, are shown in Figure 5 and Figure 6, respectively. Jack and bore would require launch and receiving pits, approximately 20 feet deep to maintain a minimum 15 feet of cover from Caltrans as installation happens level with the pits instead of the sump style of HDD. Trenchless installation by jack and bore requires pipe casing materials that can handle the installation forces. The casing and pipe material associated with jack and bore for water pipes are usually steel as a casing pipe and HDPE, ductile iron or PVC installed inside as a carrier pipe. The depth of cover for the Hwy 156 crossing will be determined by geotechnical conditions and Caltrans requirements.

San Benito County Water District | San Juan Bautista Transmission Pipeline Construction Methods
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12 Figure 5: Auger Boring
Source: North American Society for Trenchless Technology Figure 6: Microtunneling
Source: North American Society for Trenchless Technology San Benito County Water District | San Juan Bautista Transmission Pipeline Construction Methods
hdrinc.com 2365 Iron Point RoadSuite 300Folsom, CA 95630-8709 (916) 817-4700
13 CALTRANS
Requirements for crossing under Caltrans highways for HDD and jack and bore, as per the Caltrans Encroachment Permits Guidelines and Specifications for Trenchless Projects, are summarized below. Timing for permit approval should not vary between the two installation methods.

HDD
• Recommended minimum depth of cover, 10 feet.
• A soil investigation is required, suitable for the proposed complexity of the installation to confirm ground conditions that will be encountered during the HDD operation. The HDD process is a continual and extensive soil analysis as the pilot bore is made encountering the varying soils and formations.
• For projects where the product or casing is 16" or greater in diameter:
o A geotechnical evaluation by a qualified soil engineer to determine the following. ▪ subsurface strata, fill, debris and material,
▪ particle size distribution (particularly percent gravel and cobble), ▪ cohesion index, internal angle of friction, and soil classification, ▪ plastic and liquid limits (clays), expansion index (clays), soil density ▪ water table levels, and soil permeability,
• A borehole or test pit should be undertaken on both sides and in the median when conditions permit.
• The plans set submittal should contain the following information in support of the permit application.
o Location of entry and exit point.
o Equipment and pipe layout areas.
o Proposed drill path alignment (both plan & profile view). o Location, elevations and proposed clearances of all utility crossings and structures.
o Proposed Depth of cover.
o Soil analysis.
o Product material (HDPE/steel), length, diameter-wall thickness, reamer diameter. o Detailed pipe calculations, confirming ability of product pipe to withstand installation loads and long-term operational loads including H20. o Proposed composition of drilling fluid (based on soil analysis) viscosity and density.
o Drilling fluid pumping capacity, pressures and flow rates proposed. o State right-of-way lines, property, and other utility right-of-way or easement lines. o Elevations.
o Type of tracking method/system.
o Survey Grid establishment for monitoring ground surface movement (settlement or heave) due to the drilling operation.

San Benito County Water District | San Juan Bautista Transmission Pipeline Chemical Stabilization
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14 Bore and Jack Installation
• At minimum, pits must be located 10 feet from the edge of pavement in rural areas, at least 5 feet beyond the concrete curb and gutter or asphalt concrete dike in urban areas, or at least 5 feet beyond the toe of slope of embankments. • Pits must be located outside of access-controlled right-of-way. Those portions of the installation not placed by jack and bore must be encased by the open trench method. • Pits must be protected by placement of 6-foot chain link fence or Type-K barrier around them.
• Pits must be shored in accordance with Cal-OSHA requirements. • Reflectors must be affixed to the shoring on all sides facing traffic. • Pits must not affect any State facilities or create a hazard to the traveling public.

Damaged State facilities must be replaced in-kind or repaired to their original state. • All pits should have crushed rock and sump areas to clear groundwater and water used to clean the casings. Pits must be lined with filter fabric when groundwater is found, and pumping is required.
• Temporary Type-K railing must be placed at a 10:1 taper or as otherwise directed by the Caltrans’ representative to maintain the integrity of the adjacent travel lane. • Any installation that is 30 inches in diameter or greater is defined as tunnel.

Chemical Stabilization
Because the City’s water system uses groundwater and much of the system piping is cast iron, the chemical orthophosphate must be injected into the transmission pipeline so that when the surface water is blended with the groundwater, it will not leach the iron and other heavy metals from the pipe scale, leading to elevated levels of heavy metals and possibly a red color. The chemical coats the inside of the pipe and keeps the scale intact.

Orthophosphate dosing into the transmission pipeline will occur along Mission Vineyard Road or San Juan Hollister Road near the connection to the City system. Property adjacent to Well 6 will need to be acquired to house the orthophosphate system. Orthophosphate can be dosed in the form of Zinc orthophosphate or phosphoric acid. The system will include the following components:
• Chemical holding tank with two chemical metering pumps (sized to dose 1 mg/L as orthophosphate)
• Wafer-type or in-line static mixer with injection port • Associated electrical and controls.

The exact dose of orthophosphate, and whether Zinc orthophosphate or phosphoric acid is used for this system will need to be determined with jar testing utilizing District and City water samples and pipe coupons.

San Benito County Water District | San Juan Bautista Transmission Pipeline Pipeline Alignment
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15 Pipeline Alignment
For the purposes of this report, the alignment is broken down into five segments. The plans for each segment are shown in Figure 7 through Figure 13. Challenges and corresponding solutions associated with each segment are listed.

Alternative Analysis
The District has requested analysis of an alternative route to the Highway 156 frontage road.

Below, segments are broken into A or B. Route A leaves the WTP site down the access road, goes west down Union Road, turns off Union Road onto San Juan Hollister Road before crossing Highway 156 at a connection to the existing 12” water line to Mitchell Road then turns to get to the frontage road. Route B leaves the WTP site in the northwest and stays along the edge of some undeveloped properties, meets up with San Juan Hollister Road and connects to an existing 12” water line that crosses the existing Highway 156 and then extends that existing line along Mitchell Road before meeting up with the frontage road.

Segment 1A – WTP On-Site
The pipeline will start with a connection to the treated water pipeline leaving the storage tank on the eastern edge of the WHWTP paved area, see Figure 7. The connection to the 20-inch treated water pipe is at a centerline elevation of 461.27 and is approximately 26 feet deep. The pipeline goes south along the eastern edge of the site crossing existing utility water, fire water, and sewer piping. An existing septic tank is in the unpaved area south of the Administration and Operations Buildings. The pipeline must maintain a 10-foot horizontal clearance from the sewer piping and septic system or cross perpendicularly and above with 1-foot separation. Because of the depth of the pipeline on the WHWTP site, trenchless construction will be considered to avoid costly excavation and shoring, but for this report it is assumed this segment will be trenched.

Table 7: Segment 1A – WTP On-Site Challenges and Solutions Challenges Solutions
Existing utility crossings The pipeline will remain deep enough that it will be below the existing utilities.

Separation from sewer and septic system A 10-foot horizontal and 1-foot vertical separation will be maintained.

Deep construction Trench shoring will be required, trenchless construction will be considered so only two
excavations would be needed.

Environmental concerns due to possible
biological activity in wetland
Construction will be limited to the paved area,
avoiding disturbance of non-disturbed areas.

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16 Segment 1B – WTP On-Site
The pipeline will connect at the same location as Segment 1A, but the pipeline will be routed to the northwestern edge of the site needing to travel through the bulk of the treatment plant, see Figure 8.

Table 8: Segment 1B – WTP On-Site Challenges and Solutions Challenges Solutions
Existing utility crossings The pipeline will remain deep enough that it will be below the existing utilities and avoid
conflicts when possible, using the District’s
existing utility plans.

Limited space at the WHWTP The pipeline alignment will be coordinated with the design and construction of the
WHWTP Expansion Project.

Environmental concerns due to possible
biological activity in wetland and undisturbed
areas of the WHWTP
Construction will be limited, when possible, to
the paved area, avoiding non-disturbed
areas.

Deep construction Trench shoring will be required, trenchless construction will be considered so only two
excavations would be needed.

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17 Figure 7: Segment 1A Pipeline Plan
12” TREATED WATER
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18 Figure 8: Segment 1B Pipeline Plan
N

ADMINISTRATION /

OPERATIONS

BUILDING

TREATED WATER

STORAGE TANK
SEPTIC TANK LEACHFIELD 4" SANITARY SEWER 20" WATER 4" FIRE WATER

PLANT UTILITY WATER

PUMP STATION
4" WATER

WASHWATER SUPPLY

AND FIRE PUMP STATION
STEEP
SLOPE
CONNECT AT ELE 461.27
GRADE AT ELE 488.00
RELICT

WETLAND

DRIVEWAY

ENTRANCE
GATE
12" TREATED WATER

ON DISTRICT

PROPERTY
FUTURE

TREATED WATER

STORAGE TANK
12" TREATED WATER

NEW PRIVATE

EASEMENT
20" WWW/FTW
24" OF

FUTURE DRYING
BED
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19 Segment 2A – Access Road
The pipeline will continue from the WHWTP site down the hill to Union Road in the south/east side of the access road. An existing 20” raw water pipeline is on the north/west side of the access road. Trenching is the preferred method of construction for this segment. Staying in the road avoids excavation in the undisturbed areas on either side of the road that may contain biological activity. Traffic control in this area is limited to two single family residences and WHWTP deliveries and employees.

Table 9: Segment 2A – Access Road Challenges and Solutions Challenges Solutions
Separation from raw water pipeline A 10-foot horizontal and 1-foot vertical separation will be maintained.

Environmental concerns due to possible
biological activity in undisturbed land
Construction will be limited to the access
road, avoiding disturbance of non-paved
areas.

Segment 2B – Private Property
The pipeline will continue from the WHWTP site to San Juan Hollister Road through the existing private property as shown in Figure 10. While there are no significant utilities expected in this area and no traffic control required, there are significant environmental concerns given this area is currently undisturbed and potentially has protected biological activity. Trenching is the preferred method of construction for this segment, but trenchless could be used to avoid specifically sensitive areas that would need to be identified for design.

Table 10: Segment 2B Private Property Challenges and Solutions Challenges Solutions
Multiple new private easements required The alignment will be routed to minimize the number of private properties affected.

Environmental concerns due to possible
biological activity in undisturbed land
Trenchless installation will be considered to
avoid environmentally sensitive areas. Early
coordination with permitting agencies would
occur during design.

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20 Figure 9: Segment 2A Pipeline Plan
12” TREATED WATER
San Benito County Water District | San Juan Bautista Transmission Pipeline Pipeline Alignment
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21 Figure 10: Segment 2B Pipeline Plan

SAN JUAN

HOLLISTER ROAD
WEST
HILLS
WTP
12" TREATED WATER

IN NEW PRIVATE EASEMENT
N

PROPERTY LINE, TYP

TO CONNECTION WITH
EXISTING 12" CITY OF

HOLLISTER WATER LINE
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22 Segment 3 – Union Road And San Juan Hollister Road
An existing 10-foot easement for the Hollister Conduit runs through the properties to the north of Union Road. Because the easement is only 10 feet, and the 42-inch pipe is in the middle of that easement there is not enough room for proper separation or for constructability. Construction in the easement involves difficult topography with small rolling hills and steep drop-offs right at the edge of the easement down to Union Road. For these reasons, the transmission pipeline is proposed to be installed in Union Road under the northern shoulder. Trench construction of the pipe under the shoulder allows for adequate space to avoid disturbing the unpaved area outside the road, while allowing as much space as possible for traffic to be maintained around construction. Traffic control will be difficult along Union Road as the road is busy and the bends and hillsides don’t allow for optimal visibility.

The pipeline turns east onto San Juan Hollister Road and then connects to the City of Hollister water system to utilize an existing 12” water line crossing Highway 156. This connection will need to include isolation valves, pressure reducing valves, and communication with City of Hollister and SBCWD SCADA.

Table 11: Segment 3A – Union Road and San Juan Hollister Land Challenges and Solutions Challenges Solutions
No room in existing easement Pipe will be installed in Union Road away from the easement. Where the pipe must be
in the easement, separation will be
maximized, and a variance will need to be
requested from CDPH.

Environmental concerns due to possible
biological activity in undisturbed land
Construction will be limited to paved area,
avoiding disturbance of non-disturbed areas.

Heavy traffic along Union Road Construct pipe as far to the north as possible, leaving space for traffic control. Engage
County traffic team early for best practices.

Valving of connection to City of Hollister
system
Modeling of the system will be completed to
size valves and ensure customers on north
side of the highway don’t see a reduction in
service pressures.

Environmental Alternative Analysis
Alternative B construction would have a much larger impact footprint on suitable species habitats listed in Table 4 as approximately 1 mile of the alignment would occur in undeveloped grasslands that are interspersed with seasonal wetlands. Potential impacts to special-status species and their habitats from Alternative B would be significantly greater than that of Alternative A. Alternative B would require more extensive environmental permitting due to the likely presence of wetlands and construction in undisturbed areas. The permitting requirements and recommendations for each alternative are summarized in Table 12.

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23 Table 12: Permitting Requirements and Recommendations Permitting Entity Requirement Alternative Recommendation US Army Corps of
Engineers (ACE) and
the State Water
Resources Control
Board (SWRCB)
Jurisdictional
Aquatic
Delineation
Alternative B only Alternative A is
recommended due to the
presence of potential
wetlands in Alternative B.

US Fish and Wildlife
Service (USFWS)
Compliance with
the Endangered
Species Act
Both Alternative A
and Alternative B
Alternative A is
recommended due to
more severe impacts in
Alternative B.

US Fish and Wildlife
Service (USFWS)
Section 7 –
Formal
Consultation
Alternative B only Alternative A is
recommended since
Alternative B will likely be
determined to adversely
affect federally listed
species
US Fish and Wildlife
Service (USFWS)
Section 7 -
Informal
Consultation, if
needed
Alternative A only Alternative A is
recommended. No
formal consultation is
needed since work would
be restricted to paved or
active agricultural fields
concluding it would not
likely adversely affect
listed species or their
habitats
US Fish and Wildlife
Service (USFWS)
Section 10
Consultation
Alternative B only Early coordination with
the EPA is
recommended to
determine if they can
function as the lead
federal agency for
USFWS consultation. A
pre-consultation meeting
with USFWS is
recommended to solicit
early comments on the
project and address any
concerns in a Biological
Assessment report,
streamlining the process.

California Department
of Fish and Wildlife
(CDFW)
Additional
approvals for
state listed
species and
potential rare
plants
Alternative A and
Alternative B
Alternative A is
recommended due to
more severe impacts in
Alternative B.

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24 Alternative Recommendation
HDR recommends utilizing Route A for this pipeline. Route A remains in currently disturbed areas, avoiding extensive environmental permitting and easement acquisition, instead relying on encroachment permits with the County.

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25 Figure 11: Segment 3A Pipeline Plan
N

UNION ROAD
12" TREATED WATER

ENCROACHMENT IN COUNTY ROW

UNDER NORTHERN FOG LINE
42" HOLLISTER CONDUIT
EXISTING 10' EASEMENT

UNION ROAD

PACIFIC SCIENTIFIC

RAW WATER PUMP

STATION
HWY 156

SAN JUAN OAKS ROAD

CONNECTION TO
EXISTING 12" CITY OF

HOLLISTER WATER LINE
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26 Segment 4 – Highway 156 (Future Frontage Road)
The pipeline follows the Highway 156 alignment in the eastbound lane for approximately 3 miles. By the time of construction, this portion of Hwy 156 will be converted to a frontage road with the construction of the new Hwy 156 and the ROW will be transferred from Caltrans to the County. An encroachment permit from the County will be required for this section of pipeline.

Over half of Segment 4 runs parallel to the Subsystem 10 Raw Water Pipeline.

Table 13: Segment 4 – Highway 156 (Future Frontage Road) Challenges and Solutions Challenges Solutions
Separation from raw water pipeline A 10-foot horizontal and 1-foot vertical separation will be maintained.

Traffic along Hwy 156 Construct pipe as far to the south as possible, leaving space for traffic control.

Engage County traffic team early for best
practices.

Segment 5 – Connection to San Juan Bautista
At the end of the agricultural properties the pipeline turns south along the western shoulder of Mission Vineyard Road and will require a trenchless crossing of the future highway to the south.

The transmission pipeline will terminate with a connection to the City system to an existing 12” water main near the Well No. 6 treatment system on San Juan Hollister Road. Traffic control will be required along this road although this is not a heavily travelled road. Existing utilities in San Juan Hollister Road include water, raw water, and sewer. The transmission pipeline will need to maintain 10-foot horizontal separation from the sewer and raw water piping.

Near the connection to the City system is where a flow control valve, flow meter, and chemical injection vault will be located.

Connection of the HDPE transmission pipeline is to the existing cast iron. A connection detail will be drafted during design.

Table 14: Segment 5 – Connection to San Juan Bautista Challenges and Solutions Challenges Solutions
Existing utility crossings The pipeline will avoid crossing where possible using the best available information
from the City.

Separation from sewer and raw water A 10-foot horizontal and 1-foot vertical separation will be maintained.

Crossing future Highway 156, currently under
construction
Trenchless construction will be used cross
the highway, will need early coordination with
Caltrans.

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27 Figure 12: Segment 4 Pipeline Plan
N

AGRICULTURAL

FIELDS RAW WATER PIPELINE
12" TREATED WATER

ENCROACHMENT IN FUTURE COUNTY ROW

IN EASTBOUND LANE MISSION

VINEYARD ROAD
HWY 156
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28 Figure 13: Segment 5 Pipeline Plan

SAN JUAN HOLLISTER ROAD

CITY OF SAN JUAN
BAUTISTA WELL 6

TREATMENT
SYSTEM
4" SEWER FORCEMAIN
6" SANITARY SEWER
12" WATER
8" WATER
8" RAW WATER SEWER PUMP STATION WELL

CONNECTION TO CITY

OF SAN JUAN BAUTISTA
SYSTEM
N
HWY 156
12" TREATED WATER

ENCROACHMENT IN FUTURE COUNTY ROW

IN EASTBOUND LANE

RAW WATER

PIPELINE MISSION VINEYARD ROAD
San Benito County Water District | San Juan Bautista Transmission Pipeline Class 4 Cost Estimate
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29 Class 4 Cost Estimate
A Class 4 engineer’s opinion of probable construction cost is provided in Table 15. The cost estimate is based on the best available data. Because of the uncertainty surrounding construction costs in the current climate, inflation, and escalating material costs, a 20% contingency for items not yet designed is supplemented by a 10% market uncertainty contingency and a 15% escalation to mid-point of construction.

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30 Table 15: Class 4 OPCC
Cost Estimate
Client: San Benito County Water District
Project: San Juan Bautista Transmission Pipeline By: TH Subject: Basis of Design Report Date: 8/9/2024
Task: Class 4 Opinion of Probable Construction Cost Reviewed by: KC Date: 8/9/2024

QUANTITY UNITS UNIT COST TOTAL COST
DIVISION 1 - GENERAL REQUIREMENTS
Mobilization/Demobilization 1 LS 3.00% $154,900
Bonds and Insurance 1 LS 1.50% $76,300
Permitting/ROW 1 LS 5.00% $263,600
Traffic Control 1 LS $150,000 $150,000
General Conditions 1 LS 4.00% $208,700
Shop Drawings and O&M Manuals 1 LS 1.00% $50,600
Facilities Start-up & Testing 1 LS 1.00% $50,600
DIVISION SUBTOTAL $955,000
DIVISION 2 - SITE WORK
Flow Meter Vault
Excavation 37 CY $25 $933
Bedding/Backfill 5 CY $40 $213
Grading for Chemical Feed 60 CY $30 $1,800
Transmission Pipeline
Excavation 24,781 CY $25 $619,537
Bedding/Backfill 23,891 CY $40 $955,655
Unpaved Road Resurfacing 17,304 SF $3 $51,912
Paving 135,696 SF $10 $1,356,960
DIVISION SUBTOTAL $2,987,100
DIVISION 3 - CONCRETE
Precast Flow Meter Valve Vault 1 EA $15,000 $15,000
Slab on Grade for Chemical Storage Tank 57 CY $1,000 $56,549 Miscellaneous Concrete 1 LS $1,500 $1,500
DIVISION SUBTOTAL $73,100
DIVISION 5 - MISCELLANEOUS METALS
Pipe Supports 1 LS $5,000 $5,000
Miscellaneous metals 1 LS $5,000 $5,000
DIVISION SUBTOTAL $10,000
DIVISION 9 - FINISHES
Painting and Protective Coatings (Piping and Equipment) 1 LS $10,000 $10,000 DIVISION SUBTOTAL $10,000
DIVISION 10 - SPECIALTIES
Identification, Stenciling and Tagging System 1 LS $5,000 $5,000 DIVISION SUBTOTAL $5,000
DIVISION 11 - EQUIPMENT
Chemical feed pumps 1 LS $15,000 $15,000
Chemical storage tank 1 LS $50,000 $50,000
DIVISION SUBTOTAL $65,000
DIVISION 13 - SPECIAL CONSTRUCTION
Trenchless Crossings 600 LF $1,000 $600,000
Trenchless Mobilization and Rental 1 LS $75,000 $75,000 DIVISION SUBTOTAL $675,000
DIVISION 15 - MECHANICAL
6" Butterfly Valve 2 EA $4,500 $9,000
12" Butterfly Valve 8 EA $8,000 $64,000
6" HDPE, Exposed 15 LF $100 $1,500
12" HDPE, Buried 30,600 LF $30 $918,000
6" Flow Control Valve 1 EA $10,000 $10,000
Air Release Valve/Blowoff 10 EA $5,000 $50,000
Magnetic Flowmeter 1 EA $10,000 $10,000
Miscellaneous Joints, Couplings, and Fittings 1 LS $30,000 $30,000 Connection to Existing Pipelines 3 EA $30,000 $90,000
DIVISION SUBTOTAL $1,182,500
DIVISION 16 - ELECTRICAL
Electrical 1 LS $40,000 $40,000
DIVISION SUBTOTAL $40,000
SUBTOTAL (TAXABLE) $5,008,000
SUBTOTAL (NONTAXABLE INCLUDING DIV 1, DIV 16) $995,000
SALES TAX (8.75%) $438,200
SUBTOTAL $6,442,000
CONTINGENCY (20%) $1,289,000
MARKET UNCERTAINTY (10%) $645,000
ESCALATION TO MID-POINT OF CONSTRUCTION (15%) $967,000
TOTAL $9,343,000
Notes: 1. This cost opinion does not include any County administrative costs.

2. This cost opinion does not include costs for engineering, and/or construction management.

3. The contingency is for unknown items left out of the cost estimate.

DESCRIPTION
San Benito County Water District | San Juan Bautista Transmission Pipeline hdrinc.com 2365 Iron Point RoadSuite 300Folsom, CA 95630-8709 (916) 817-4700
Appendix A – Basis of Design Report (2021)
Basis of Design
Report
San Juan Bautista Transmission
Pipeline
Hollister, CA
October 29, 2021
San Benito County Water District | San Juan Bautista Transmission Pipeline Table of Contents
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i
Table of Contents
Objectives.................................................................................................................................. 1 Preliminary Investigations .......................................................................................................... 1 Right-of-Way and Easements................................................................................................. 1 Utility Investigation.................................................................................................................. 4 Geotechnical Investigation...................................................................................................... 4 Topographic Survey ............................................................................................................... 4 Water Quality.......................................................................................................................... 4 City of San Juan Bautista Water System............................................................................. 4 West Hills Water Treatment Plant ....................................................................................... 5 Environmental Constraints and Permitting.............................................................................. 5 Design Standards ...................................................................................................................... 5 Pipe and Valves ..................................................................................................................... 5 Road Work ............................................................................................................................. 6 Water and Sewer Separation.................................................................................................. 6 Hydraulics .................................................................................................................................. 6 Flow Monitoring and Control................................................................................................... 8 Construction Methods ................................................................................................................ 8 Trench Installation............................................................................................................... 8 Trenchless Installation ........................................................................................................ 8 Chemical Stabilization................................................................................................................ 8 Pipeline Alignment ..................................................................................................................... 9 Segment 1 – WTP On-Site ..................................................................................................... 9 Segment 2 – Access Road ....................................................................................................16 Segment 3 –Union Road .......................................................................................................16 Segment 4 –Existing Easement in Agricultural Area..............................................................17 Segment 5 – New Easement in Agricultural Area ..................................................................18 Segment 6 – Connection to San Juan Bautista......................................................................18 Class 4 Cost Estimate...............................................................................................................19 San Benito County Water District | San Juan Bautista Transmission Pipeline Table of Contents
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ii
List of Figures
Figure 1: Transmission Pipeline Overall Alignment .................................................................... 2 Figure 2: Union Road Encroachment and Existing Easement for Hollister Conduit .................... 3 Figure 3: Hydraulic Grade Line Maximum Day (357 gpm, 99 psi at Connection)........................ 7 Figure 4: Segment 1 Pipeline Plan............................................................................................10 Figure 5: Segment 2 Pipeline Plan............................................................................................11 Figure 6: Segment 3 Pipeline Plan............................................................................................12 Figure 7: Segment 4 Pipeline Plan............................................................................................13 Figure 8: Segment 5 Pipeline Plan............................................................................................14 Figure 9: Segment 6 Pipeline Plan............................................................................................15 List of Tables
Table 1: Summary of Utilities in the Project Area ....................................................................... 4 Table 2: City of San Juan Bautista Water Quality Data .............................................................. 5 Table 3: West Hills Water Treatment Plant Water Quality Data.................................................. 5 Table 4: City of San Juan Bautista Flow Demands..................................................................... 6 Table 5: Hydraulic Design Criteria.............................................................................................. 7 Table 6: Segment 1 – WTP On-Site Challenges and Solutions .................................................. 9 Table 7: Segment 2 – Access Road Challenges and Solutions .................................................16 Table 8: Segment 3 – Union Road Challenges and Solutions ...................................................17 Table 9: Segment 4 – Existing Easement in Agricultural Area Challenges and Solutions..........17 Table 10: Segment 5 – New Easement in Agricultural Area Challenges and Solutions .............18 Table 11: Segment 6 – Connection to San Juan Bautista Challenges and Solutions ................18 Table 12: Class 4 OPCC...........................................................................................................20 Appendices
Appendix A – Draft Conceptual Geotechnical Study
Appendix B – Biological Constraints Memo
Appendix C – Horizontal Directional Drilling
San Benito County Water District | San Juan Bautista Transmission Pipeline Objectives
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1 Objectives
This project will provide a new source of drinking water to the City of San Juan Bautista (City).

A new transmission pipeline from the San Benito County Water District’s (District) West Hills Water Treatment Plant (WHWTP) to the City is proposed to be constructed across the agricultural area to connect to the City’s water system near the Well No. 6 treatment system.

The goal of this transmission pipeline is to improve water reliability and additional capacity to the City system.

This report provides a summary of initial investigations, standards for design of the pipeline, hydraulic analysis, methods of construction, details on the alignment, and a cost estimate.

Preliminary Investigations
Right-of-Way and Easements
The overall alignment of the pipeline is shown in Figure 1. The pipeline alignment travels through existing District easements and will require new easements from San Benito County (County) and private agricultural land from three properties.

The pipeline from the connection at WHWTP to Union Road will be on District property or within an existing District easement along the driveway.

An encroachment is required along Union Road in County right of way (ROW). The pipeline is proposed to be under the northern shoulder (outside the west-bound lane), see Figure 2. An encroachment permit from the County will be required.

The Subsystem 10 raw water system (including the Hollister Conduit) provides raw water to the WHWTP and provides an existing easement for the transmission pipeline to follow once in the agricultural area for about 2.5 miles. The remainder of the alignment in the agricultural area will require a new easement. A new easement will follow along the edge of three agricultural properties in their access road.

Another County encroachment is required along Mission Vineyard Road in the east shoulder and where the alignment turns onto San Juan Hollister Road.

WEST HILLS WTP ACCESS ROAD

UNION ROAD

OLIVE GROVE

SAN JUAN OAKS

LEGEND DEVELOPMENT

TREATED WATER TRANSMISSION PIPELINE
SUBSYSTEM 10 RAW WATER PIPELINE

HOLLISTER CONDUIT RAW WATER PIPELINE

EXISTING ACCESS ROAD EASEMENT
EXISTING SUBSYSTEM 10 EASEMENT

COUNTY ENCROACHMENT
NEW PRIVATE EASEMENT HWY 156 WELL NO. 6

SAN JUAN

BAUTISTA HOLLISTER MISSION VINEYARD
ROAD

HEAVILY ROTATED

AGRICULTURAL AREA
San Benito County Water District | San Juan Bautista Transmission Pipeline Preliminary Investigations
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3 Figure 2: Union Road Encroachment and Existing Easement for Hollister Conduit

UNION ROAD
PROPOSED 10"

TRANSMISSION PIPELINE

UNDER SHOULDER
42" HOLLISTER

CONDUIT ACCESS MANHOLE

PROPERTY LINE

PROPERTY LINE N

EXISTING

EASEMENT
San Benito County Water District | San Juan Bautista Transmission Pipeline Preliminary Investigations
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4 Utility Investigation
The utilities in the area are summarized in Table 1. Letters have been sent to the utilities for their alignments and potential conflicts. Once their responses are provided the utility alignments will be included in the detailed design if there are alignment conflicts.

Table 1: Summary of Utilities in the Project Area
Company Utility Type
Charter Communications Communications
Level 3 Communications Communications
Pacific Bell Communications
PG&E Electric/Gas
City of San Juan Bautista Water, Sewer, Storm Drain
Geotechnical Investigation
The geotechnical investigation for this project phase included a conceptual desktop study based on previous geotechnical reports and any available information on the area. The draft conceptual geotechnical study is included as Appendix A. The results from the study have been used to inform the design criteria of this report. This study will be followed up with borings, testing, and a more detailed geotechnical report in the next phase of design.

Topographic Survey
San Benito Engineering & Surveying performed a topographical survey with one-foot contours and orthophotography by aerial survey flown on September 23, 2021. The results from the survey have not yet been provided to HDR. The survey will include easements, property lines, and boundary work.

San Benito County Water District | San Juan Bautista Transmission Pipeline Design Standards
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5 Table 2: City of San Juan Bautista Water Quality Data Constituent MCL City Well 1
(Raw)
City Well 5
(Raw)
City Well 6
(Inactive)
pH 6.5 – 8.5 6.7 – 8.0 7.5 7.7 – 8.1
Hardness as CaCO3 (mg/L) - 353 – 485 321 334 – 371
Alkalinity as CaCo3 (mg/L) - 278 – 360 320 380
Notes:

1. Source: City of San Juan Bautista Water Master Plan (November 2020), Akel Engineering

Table 3: West Hills Water Treatment Plant Water Quality Data Constituent MCL WHWTP
Effluent
pH 6.5 – 8.5 8.1
Hardness as CaCO3 (mg/L) - 105
Alkalinity as CaCo3 (mg/L) - 66
Source: Safe Drinking Water Information System, California Water Board Environmental Constraints and Permitting
As part of the predesign for this project, a preliminary biological constraints and U.S. Fish and Wildlife Service coordination memorandum was prepared. A site visit was conducted on September 24, 2021 to review the pipeline alignment and document areas of concern for potential impacts to sensitive species. This memo is provided in Appendix B. The identified areas of concern and measures to reduce the possible impact to sensitive species or required mitigation discussed in the memo are used for the analysis described in this report.

Design Standards
Pipe and Valves
The 10” diameter pipe will be high-density polyethylene (HDPE) standard dimensional ratio (SDR) 17, 125 psi, conforming to AWWA C906 which contains the standards for polyethylene pressure pipe from 4 inches to 65 inches. All joints will be restrained and any bends in the alignment will include thrust blocks.

Isolation valves will be provided at the tie-in locations at either end of the alignment and spaced every mile along the pipeline for easy isolation in case of repairs. These isolation valves will be 10” diameter butterfly valves complying with AWWA C504.

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6 Road Work
Road resurfacing design will follow County standards to meet the requirement of the encroachment permit.

The project will follow the 2018 CalTrans Standard Specifications for general construction traffic control. Traffic control will be needed on the north side of Union Road for trenching of the pipeline under the shoulder. During construction, it is likely that one lane will be completely shutdown during working hours. At the end of each construction day, the contractor will be required to place trench plates over the open trench and reopen the lane to traffic. The contractor will be required to prepare a traffic control plan to be stamped and signed by a registered California engineer.

The standard which DDW requires is laid out in the California Code of Regulations, Title 22, Division 4, Chapter 16, Waterworks Standards (WWS), Section 64572. It is up to the designer to justify what is considered an upgraded material and how it meets or exceeds the requirements laid out in Section 64572.

Hydraulics
The flow demands for the City system are from the Water Master Plan (2020) and are shown in Table 4.

Table 4: City of San Juan Bautista Flow Demands
Existing Demands
Minimum Month
Average Day
Maximum Day
Supplied by WHWTP (65%)
Flow (gpm)
110
183
411
267
2035 Demands
Minimum Month
Average Day
Maximum Day
Supplied by WHWTP (65%)
146
244
549
357
Buildout Demands
Minimum Month
Average Day
Maximum Day
Supplied by WHWTP (65%)
236
393
884
TBD
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7 The SDR 17 transmission pipeline diameter is 10 inches nominal and 9.41 inches inside diameter. Therefore, the minimum velocity is 0.3 ft/s at the existing minimum month (65% of 110 gpm is 71.5 gpm) and the maximum velocity is 1.6 ft/s at 2035 maximum day. While this is a low velocity through the transmission pipeline, the sizing of the pipeline is adequate to maintain the required pressures in the City water system. Pressures at the point of connection to the City system (near the Inactive Well 6 Site) under Maximum Day Demand conditions are as follows:
• Minimum Pressure – 64.8 psi
• Average Pressure – 82.4 psi
• Maximum Pressure – 99.0 psi
The criteria for hydraulic design are provided in Table 5. Bends were assumed to be 90-degrees where needed.

Table 5: Hydraulic Design Criteria
Criteria Unit Value
C-value - 130
Treated Water Storage Tank Elevation ft. MSL 487
90-degree bend K-value - 0.3
Figure 3 shows the hydraulic grade line across the transmission pipeline to maintain the maximum pressure of 99 psi at the connection at maximum day demand (357 gpm). A control valve loss at 34+00 is based on a control valve placed along the pipeline near the raw water pump station.

Figure 3: Hydraulic Grade Line Maximum Day (357 gpm, 99 psi at Connection) 100
150
200
250
300
350
400
450
500
550
0+00 50+00 100+00 150+00 200+00 250+00 300+00 350+00 400+00 Elevation (ft)
STA (ft)
10" Transmission Pipeline

HGL WHWTP
CITY
San Benito County Water District | San Juan Bautista Transmission Pipeline Construction Methods
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8 As part of final design, it is recommended that a transient and surge pressure analysis be performed. This analysis will help in determining system pressure during a surge event and if any surge relief is required as part of the design.

Flow Monitoring and Control
Flow monitoring is required for regulatory purposes and a control valve is required to ensure the treated water storage tank is not drained. At the base of the access road near Union Road a vault will contain a flow control valve, flow meter, and chemical injection port. The flow meter power and communications can be routed to the raw water pump station to communicate with the WHWTP. The control valve is a Cla-Val 40-01 (or equal) that is hydraulically operated and pilot-controlled keeping flow below a preset maximum based on pressure drop across an orifice plate. Based on City demands and preventing cavitation at the valve, the valve will be sized at 6 inches. The flow meter will also be 6 inches to ensure adequate velocity for accurate readings.

Construction Methods
Trench Installation
All trench installation shall be bedded with crushed rock and backfilled with suitable engineered material or acceptable native material. The bedding, backfill, and compaction requirements will follow the recommendations of the geotechnical report.

Trenchless Installation
As the proposed pipeline alignment leaves Union Road and goes into the agricultural area, it must cross an olive grove (see Figure 1). The olive grove perimeter has the potential for biological activity and trenching through this grove would prove difficult. Horizontal directional drilling (HDD) will be utilized to cross under Union Road and the olive grove and in areas where excavation will significantly disturb traffic or commerce or is deep enough that trenching is cost prohibitive.

HDD is a technique that can be used to install pipe in new alignments without trenching in diameters ranging from 2 in to 65 inches. It is commonly used to install pipelines beneath water bodies or other surface features. HDD requires excavation at its launching and receiving pits.

Installation is flexible enough to be able to plan excavation areas in advance and avoid areas with existing surface obstructions or areas with sensitive species. A more detailed description of HDD is provided for reference in Appendix C.

San Benito County Water District | San Juan Bautista Transmission Pipeline Pipeline Alignment
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9 Orthophosphate dosing into the transmission pipeline will occur along the access road north of Union Road near the raw water pump station. The existing 40-foot-wide utility construction and maintenance easement at the raw water pump station should provide room to expand the area inside the fencing and include the orthophosphate system. Orthophosphate can be dosed in the form of Zinc orthophosphate or phosphoric acid. The system will include the following components:
• Chemical holding tank with two chemical metering pumps (sized to dose 1 mg/L as orthophosphate)
• Wafer-type static mixer with injection port
• Associated electrical and controls
The exact dose of orthophosphate needed for this system will need to be determined with jar testing utilizing District and City water samples and pipe coupons.

Pipeline Alignment
For the purposes of this report, the alignment is broken down into six segments. The plans for each segment are shown in Figure 4 through Figure 9. Challenges and corresponding solutions associated with each segment are listed.

Segment 1 – WTP On-Site
The pipeline will start with a connection to the treated water pipeline leaving the storage tank on the eastern edge of the WHWTP paved area. The connection to the 20-inch treated water pipe is at a centerline elevation of 461.27 and is approximately 26 feet deep. The pipeline goes south along the eastern edge of the site crossing existing utility water, fire water, and sewer piping. An existing septic tank is in the unpaved area south of the Administration and Operations Buildings.

The pipeline must maintain a 10-foot horizontal clearance from the sewer piping and septic system or cross perpendicularly and above with 1-foot separation. Because of the depth of the pipeline on the WHWTP site, trenchless construction will be considered to avoid costly excavation and shoring, but for this report it is assumed this segment will be trenched.

Table 6: Segment 1 – WTP On-Site Challenges and Solutions Challenges Solutions
Existing utility crossings The pipeline will remain deep enough that it will be below the existing utilities.

Separation from sewer and septic system A 10-foot horizontal and 1-foot vertical separation will be maintained.

Deep construction Trench shoring will be required, trenchless construction will be considered so only two
excavations would be needed.

Environmental concerns due to possible
biological activity in wetland
Construction will be limited to the paved area,
avoiding disturbance of non-disturbed areas.

San Benito County Water District | San Juan Bautista Transmission Pipeline Pipeline Alignment
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10 Figure 4: Segment 1 Pipeline Plan

ADMINISTRATION /

OPERATIONS

BUILDING

ADMINISTRATION /

OPERATIONS

BUILDING

TREATED WATER

STORAGE TANK

ENTRANCE GATE
SEPTIC TANK LEACHFIELD4" SANITARY SEWER
20" WATER
4" FIRE WATER

PLANT UTILITY WATER

PUMP STATION
4" WATER WASHWATER SUPPLY
AND FIRE PUMP STATION 10" TREATED WATER

STEEP SLOPE
CONNECT AT ELE 461.27
GRADE AT ELE 488.0
RELICT

WETLAND

DRIVEWAY
20" RAW WATER N
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11 Figure 5: Segment 2 Pipeline Plan
RELICT
WETLAND ENTRANCE GATE 10" TREATED WATER 42" HOLLISTER

CONDUIT
20" RAW WATER RAW WATER

PUMP STATION

N UNION ROAD
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12 Figure 6: Segment 3 Pipeline Plan
N

UNION ROAD
42" HOLLISTER CONDUIT
EXISTING 10' EASEMENT
10" TREATED WATER

ENCROACHMENT IN COUNTY ROW

UNDER NORTHERN FOG LINE

TRENCHLESS INSTALLATION
OLIVE 1,000 FEET

GROVE SAN JUAN OAKS ROAD PACIFIC SCIENTIFIC

RAW WATER

PUMP STATION UNION ROAD
San Benito County Water District | San Juan Bautista Transmission Pipeline Pipeline Alignment
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13 Figure 7: Segment 4 Pipeline Plan
N
10" TREATED WATER

EXISTING EASEMENT
42" HOLLISTER CONDUIT

EXISTING EASEMENT AGRICULTURAL
FIELD

SAN JUAN OAKS

DEVELOPMENT

EXISTING EASEMENT ENDS

SAN JUAN OAKS ROAD

UNION ROAD
OLIVE
GROVE
San Benito County Water District | San Juan Bautista Transmission Pipeline Pipeline Alignment
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14 Figure 8: Segment 5 Pipeline Plan
10" TREATED WATER

NEW EASEMENT

ALONG ACCESS ROAD
42" HOLLISTER CONDUIT

EXISTING EASEMENT

AGRICULTURAL
FIELD

SAN JUAN OAKS

DEVELOPMENT

MISSION VINEYARD ROAD

MISSION VINEYARD ROAD
N

DRAINAGE DITCH CROSSING

RESIDENCE
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15 Figure 9: Segment 6 Pipeline Plan
10" TREATED WATER

ENCROACHMENT IN COUNTY ROW

IN EASTERN SHOULDER N

MISSION VINEYARD ROAD

SAN JUAN HOLLISTER ROAD

CITY OF SAN JUAN
BAUTISTA WELL 6

TREATMENT
SYSTEM
4" SEWER FORCEMAIN
6" SANITARY SEWER
12" WATER
8" WATER
8" RAW WATER SEWER PUMP STATION WELL

CONNECTION TO CITY OF SAN JUAN

BAUTISTA SYSTEM
10" TREATED WATER

NEW EASEMENT

ALONG ACCESS ROAD
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16 Segment 2 – Access Road
The pipeline will continue from the WHWTP site down the hill to Union Road in the south/east side of the access road. An existing 20” raw water pipeline is on the north/west side of the access road. Trenching is the preferred method of construction for this segment. Staying in the road avoids excavation in the undisturbed areas on either side of the road that may contain biological activity. Traffic control in this area is limited to two single family residences and WHWTP deliveries and employees.

At the base of the access road near Union Road is where a flow control valve, flow meter, and chemical injection vault will be located. The flow meter power and communications can be routed to the raw water pump station to communicate with the WHWTP. The control valve is a Cla-Val 40-01 (or equal) that is hydraulically operated and pilot-controlled to ensure the pipeline does not exceed a preset maximum flowrate. The orthophosphate chemical injection for scale will stabilize the City water system.

Table 7: Segment 2 – Access Road Challenges and Solutions Challenges Solutions
Separation from raw water pipeline A 10-foot horizontal and 1-foot vertical separation will be maintained.

Environmental concerns due to possible
biological activity in undisturbed land
Construction will be limited to the access
road, avoiding disturbance of non-paved
areas.

Segment 3 –Union Road
An existing 10-foot easement for the Hollister Conduit runs through the properties to the north of Union Road. Because the easement is only 10 feet and the 42-inch pipe is in the middle of that easement there is not enough room for proper separation or for constructability. Construction in the easement provides difficult topography with small rolling hills and steep drop-offs right at the edge of the easement down to Union Road. For these reasons, the transmission pipeline is proposed to be installed in Union Road under the northern shoulder. Trench construction of the pipe under the shoulder allows for adequate space to avoid disturbing the unpaved area outside the road, while allowing as much space as possible for traffic to be maintained around construction. Traffic control will be difficult along Union Road as the road is busy and the bends and hillsides don’t allow for optimal visibility.

The pipeline crosses Union Road, through an olive grove and continues into the agricultural area. To avoid trenching through the olive grove and undisturbed areas surrounding it (with potentially protected biology) trenchless construction in recommended. The crossing will be about 1,000 feet and most likely constructed using horizontal directional drilling. Once leaving Union Road, the pipeline will need to join the Hollister Conduit in the existing easement so that a new easement will not be needed from the property owners. As the two pipes go through and around the olive grove the separation of the pipes may be closer than the recommended 10 San Benito County Water District | San Juan Bautista Transmission Pipeline Pipeline Alignment
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17 feet. Because the pipe is HDPE (no joints where leaks are likely to permeate) and under pressure it is likely to be an acceptable variance from CDPH.

Table 8: Segment 3 – Union Road Challenges and Solutions Challenges Solutions
No room in existing easement Pipe will be installed in Union Road away from the easement. Where the pipe must be
in the easement, separation will be
maximized, and a variance will need to be
requested from CDPH.

Environmental concerns due to possible
biological activity in undisturbed land
Construction will be limited to paved area,
avoiding disturbance of non-disturbed areas.

Heavy traffic along Union Road Construct pipe as far to the north as possible, leaving space for traffic control. Engage
County traffic team early for best practices.

Trenching through the olive grove and
undisturbed land is undesirable
Trenchless construction will be used to go
under Union Road and the olive grove.

Segment 4 –Existing Easement in Agricultural Area
A 20-foot easement surrounds the Subsystem 10 (including the Hollister Conduit) raw water piping in the agricultural area. This easement provides enough room for the transmission pipeline to maintain the necessary 10-foot separation requirements. Construction schedule will need to be coordinated with the property owners and managers to ensure that the trench will not be disturbing any crops.

The area to the south of the agricultural area is part of the San Juan Oaks development. During the site visit on September 24, 2021 this was an area of concern due to high likelihood of biological activity and protected species. Upon further investigation, the area is currently undergoing mitigation measures to avoid disturbance of protected species and thus the pipeline route in the adjacent agricultural area is unlikely to encounter any of those species.

Table 9: Segment 4 – Existing Easement in Agricultural Area Challenges and Solutions Challenges Solutions
Trenching through active agricultural land Schedule will be coordinated with property owners and managers, so those sections of
land are not being used at the time of
construction. Land will be restored to
preconstruction state.

Land to the south appears to have a high
likelihood of biological activity
Mitigation measures are already being taken
in this area due to the San Juan Oaks
development.

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18 Segment 5 – New Easement in Agricultural Area
The pipeline will be constructed through an access road along the southern edge of three properties from the end of the Subsystem 10 piping until Mission Vineyard Road. Preliminary discussions with the property owners and managers were positive that they would allow a new easement through this area. Areas of concern along this alignment are crossing an irrigation ditch and passing a residence. The ditch can be repaired following trenching and the alignment can fit between the house and the property line. The construction schedule can be coordinated with the residents to avoid conflicts. Staying in the access road adjacent to the heavily rotated agriculture likely avoids encounters with sensitive species.

Table 10: Segment 5 – New Easement in Agricultural Area Challenges and Solutions Challenges Solutions
Trenching through active agricultural land Schedule will be coordinated with property owners and managers, so those sections of
land are not being used at the time of
construction. Land will be restored to
preconstruction state.

Land to the south appears to have a high
likelihood of biological activity
Staying in the access road on the north side
of the fence reduces the possible impact to
sensitive species.

Segment 6 – Connection to San Juan Bautista
At the end of the agricultural properties the pipeline turns north along the eastern shoulder of Mission Vineyard Road. An encroachment permit will be required from the County for this stretch of pipeline. The transmission pipeline will terminate with a connection to the City system to an existing 12” water main near the Well No. 6 treatment system on San Juan Hollister Road.

Traffic control will be required along this road although this is not a heavily travelled road.

Existing utilities in San Juan Hollister Road include water, raw water, and sewer. The transmission pipeline will need to maintain 10-foot horizontal separation from the sewer and raw water piping.

Connection of the HDPE transmission pipeline to the existing pipe (assumed to be cast iron) will require a HDPE flange adapter with a backing ring.

Table 11: Segment 6 – Connection to San Juan Bautista Challenges and Solutions Challenges Solutions
Existing utility crossings The pipeline will avoid crossing where possible using the best available information
from the City.

Separation from sewer and raw water A 10-foot horizontal and 1-foot vertical separation will be maintained.

San Benito County Water District | San Juan Bautista Transmission Pipeline Class 4 Cost Estimate
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19 Class 4 Cost Estimate
A Class 4 engineer’s opinion of probable construction cost is provided in Table 12. The cost estimate is based on the best available data. Because of the uncertainty surrounding construction costs in the current climate, inflation, and escalating material costs, a 20% contingency for items not yet designed is supplemented by a 10% market uncertainty contingency and a 15% escalation to mid-point of construction.

San Benito County Water District | San Juan Bautista Transmission Pipeline Class 4 Cost Estimate
hdrinc.com 2365 Iron Point RoadSuite 300Folsom, CA 95630-8709 (916) 817-4700
20 Table 12: Class 4 OPCC
Cost Estimate
Client: San Benito County Water District
Project: San Juan Bautista Transmission Main 30% Design By: TH Subject: 30% Design Date: 10/25/2021
Task: Class 4 Opinion of Probable Construction Cost Reviewed by: LK Date: 10/28/2021

QUANTITY UNITS UNIT COST TOTAL COST
DIVISION 1 - GENERAL REQUIREMENTS
Mobilization/Demobilization 1 LS 3.00% $128,700
Bonds and Insurance 1 LS 1.50% $63,400
Permitting/ROW 1 LS 5.00% $219,000
Easement Acquisition 1 LS $50,000 $50,000
Traffic Control 1 LS $35,000 $35,000
General Conditions 1 LS 4.00% $173,400
Shop Drawings and O&M Manuals 1 LS 1.00% $42,100
Facilities Start-up & Testing 1 LS 1.00% $42,100
DIVISION SUBTOTAL $754,000
DIVISION 2 - SITE WORK
Flow Meter Vault
Excavation 37 CY $25 $933
Bedding/Backfill 5 CY $40 $213
Grading for Chemical Feed 60 CY $30 $1,800
Transmission Pipeline
Excavation 27,515 CY $25 $687,870
Bedding/Backfill 26,814 CY $40 $1,072,554
Unpaved Road Resurfacing 118,060 SF $3 $354,180
Paving 55,440 SF $10 $554,400
DIVISION SUBTOTAL $2,672,000
DIVISION 3 - CONCRETE
Precast Flow Meter Valve Vault 1 EA $15,000 $15,000
Slab on Grade for Chemical Storage Tank 57 CY $1,000 $56,549 Miscellaneous Concrete 1 LS $1,500 $1,500
DIVISION SUBTOTAL $73,100
DIVISION 5 - MISCELLANEOUS METALS
Pipe Supports 1 LS $5,000 $5,000
Miscellaneous metals 1 LS $5,000 $5,000
DIVISION SUBTOTAL $10,000
DIVISION 9 - FINISHES
Painting and Protective Coatings (Piping and Equipment) 1 LS $10,000 $10,000 DIVISION SUBTOTAL $10,000
DIVISION 10 - SPECIALTIES
Identification, Stenciling and Tagging System 1 LS $3,000 $10,000 DIVISION SUBTOTAL $10,000
DIVISION 11 - EQUIPMENT
Chemical feed pumps 1 EA $15,000 $15,000
Chemical storage tank 1 EA $50,000 $50,000
DIVISION SUBTOTAL $65,000
DIVISION 13 - SPECIAL CONSTRUCTION
Horizontal Directional Drilling 1,000 LF $50 $50,000
HDD Mobilization and Rental 1 LS $10,000 $10,000
DIVISION SUBTOTAL $60,000
DIVISION 15 - MECHANICAL
6" Butterfly Valve 2 EA $4,000 $8,000
10" Butterfly Valve 8 EA $7,500 $60,000
6" HDPE, Exposed 15 LF $100 $1,500
10" HDPE, Buried 34,700 LF $32 $1,110,400
6" Flow Control Valve 1 EA $10,000 $10,000
Air Release Valve/Blowoff 4 EA $5,000 $20,000
Magnetic Flowmeter 1 EA $10,000 $10,000
Miscellaneous Joints, Couplings, and Fittings 1 LS $30,000 $30,000 Connection to Existing Pipelines 1 LS $10,000 $10,000
DIVISION SUBTOTAL $1,259,900
DIVISION 16 - ELECTRICAL
Electrical 1 LS $25,000 $25,000
DIVISION SUBTOTAL $25,000
SUBTOTAL (TAXABLE) $4,160,000
SUBTOTAL (NONTAXABLE INCLUDING DIV 1, DIV 16) $779,000
SALES TAX (8.75%) $364,000
SUBTOTAL $5,303,000
CONTINGENCY (20%) $1,061,000
MARKET UNCERTAINTY (10%) $531,000
ESCALATION TO MID-POINT OF CONSTRUCTION (15%) $796,000
TOTAL $7,691,000
Notes: 1. This cost opinion does not include any County administrative costs.

2. This cost opinion does not include costs for engineering, and/or construction management.

3. The contingency is for unknown items left out of the cost estimate.

DESCRIPTION
San Benito County Water District | San Juan Bautista Transmission Pipeline hdrinc.com 2365 Iron Point RoadSuite 300Folsom, CA 95630-8709 (916) 817-4700
Appendix A – Draft Conceptual Geotechnical
Study
San Benito County Water District | San Juan Bautista Transmission Pipeline Technical Memorandum
hdrinc.com 2365 Iron Point Road, Suite 300 Folsom, CA 95630-8709 (916) 817-4700
1 Technical Memorandum
Date: Wednesday, July 21, 2021
Project: City of San Juan Bautista Transmission Pipeline Project Author: Jimmy Wong
Reviewed by: Edwin Woo, PE, GE
Subject: Preliminary Geotechnical Evaluation
Introduction
San Benito County Water District (SBCWD) has retained HDR to evaluate the addition of a treated water transmission pipeline from the West Hills Water Treatment Plant (WHWTP) to the City of San Juan Bautista. This technical memorandum (TM) presents the results of a preliminary geotechnical evaluation performed in support of the design and construction of the proposed pipeline. It is our understanding that the proposed pipeline will be 10 inches in diameter, and extend for a length of approximately 35,000 feet. The proposed pipeline alignment will begin at the WHWTP, run through agricultural fields in the San Juan Valley, and connect to the existing Well No. 6 in the City of San Juan Bautista, as presented on Figures 1 through 5.

This TM presents the following:
 Discussion of regional and site geology and seismicity;  Discussion of general soil, bedrock, and groundwater conditions in the site area;  Potential for seismic hazards, including fault rupture and liquefaction;  Pipeline trench excavation and shoring considerations;  Anticipated groundwater conditions and construction dewatering considerations; and  Suitability for trenchless pipeline construction for the anticipated subsurface conditions.

Regional and Site Geology
The project site is located in the western portion of the Central California Area in the Coast Ranges geomorphic province of California, which is characterized by northwest-southeast trending valleys and ridges. These valleys and ridges are controlled by folds and faults that resulted from the collision of the Pacific and North American plates, subduction of the Pacific Plate beneath the North American Plate, and subsequent strike-slip faulting along the San Andreas Fault zone and the plate boundary fault systems. Bedrock underlying the region is primarily of the Franciscan Complex, characterized by a diverse assemblage of sandstone, shale, chert, greenstone and mélange.

Figure 6 presents the proposed pipeline alignment superimposed on a surficial geology map prepared by Wagner et al (2002). Based on this map, the majority of the pipeline alignment from Well No. 6 to approximately San Juan Oaks Road is underlain by alluvium consisting of San Benito County Water District | San Juan Bautista Transmission Pipeline Regional and Site Seismicity
hdrinc.com 2365 Iron Point Road, Suite 300 Folsom, CA 95630-8709 (916) 817-4700
2 unconsolidated stream and basin deposits. The remainder of the proposed pipeline alignment east of approximately San Juan Oaks Road is underlain by marine sandstone and siltstone of the Etchegoin Formation and Unnamed Pliocene Continental Deposits consisting mostly of mudstone.

Regional and Site Seismicity
Geologists and seismologists recognize the San Francisco Bay Area and Central California Area as among the most active seismic regions in the United States. Active faults extending through these areas have produced at least 11 large (moment magnitude, Mw 6.0 or greater) earthquakes over the last two centuries that have damaged buildings and other infrastructure.

The faults causing such earthquakes are part of a system of faults along the boundary of the Pacific and North American plates and locally include the San Andreas and Calaveras faults.

The major fault in the system is the San Andreas fault that extends for at least 450 miles along the coast of California.

Table 1 summarizes the approximate distances between the general pipeline area and the eight closest mapped active or potentially active faults based on the 2008 update to the United States National Seismic Hazard Maps (NSHM) online Fault Parameter database (USGS, 2008).

Table 1. Regional Faults and Seismicity
Fault
(segments)
Approximate
Distance from
Site, mi (3)
Direction from
Site
Maximum Moment
Magnitude
N. San Andreas;SAO+SAN+SAP+SAS1 0.2 West 7.94
Calaveras;CN+CC+CS2 1.8 East 7.03
Zayante-Vergeles 2.8 Southwest 7.00
Quien Sabe 9.2 East 6.60
Rinconada 18.3 South 7.50
Ortigalita 24.5 East 7.10
Monterey Bay-Tularcitos 26.5 West 7.30
Monte Vista-Shannon 32.1 North 6.50
1 San Andreas segments: SAO = Offshore, SAN = North Coast, SAP = Peninsula, SAS = Santa Cruz Mountains 2 Calaveras segments: CN = Northern, CC = Central, CS = Southern 3 The distances from the San Andreas and Calaveras faults were measured from the west and east ends, respectively, of the proposed pipeline alignment.

The online information is documented by the United States Geological Survey (USGS) Open File Report 2008–1128 (USGS, 2008). We note that the 2008 NSHM Fault Parameter Database is not a complete list of area faults that could cause ground shaking at the site.

As shown on Figure 7, the western end of the proposed pipeline at Well No. 6 is located within or very near the edge of the Fault-Rupture Hazard Zone for the San Andreas fault, as designated by the Alquist-Priolo Earthquake Fault Zoning Act (1972).

San Benito County Water District | San Juan Bautista Transmission Pipeline Subsurface Conditions
hdrinc.com 2365 Iron Point Road, Suite 300 Folsom, CA 95630-8709 (916) 817-4700
3 Another fault of note due to its close proximity to the general project site is the northwest trending strike-slip Sargent fault that runs through Santa Cruz and San Benito Counties, approximately 4 miles north of the pipeline alignment area. This fault is considered potentially active and has been included in recent USGS online Quaternary fault maps with a slip rate between 1 and 5 mm/year (USGS, n.d.). The fault map lists the Sargent fault as a latest Quaternary fault (with movement within the last 15 thousand years), and its location is inferred.

Earthquakes on these or other active faults (including unmapped faults) could cause strong ground shaking at the site. Earthquake intensities vary throughout the Bay Area and Central California Area depending on the magnitude of the earthquake, the distance of the site from the causative fault, the type of materials underlying the site, and other factors.

Subsurface Conditions
The anticipated subsurface conditions in the project area presented below are based on available published information, information provided to us by SBCWD, and information in our files. Our interpretation of subsurface conditions is based on the following:
 Borings and cone penetrometer tests (CPTs) performed by Caltrans for the San Juan Creek Bridge and San Juan Bautista 4-Lane Designs (Caltrans, 2009 and Caltrans, 2002). These explorations were performed along State Route 156, located up to 2,500 feet north of the proposed pipeline alignment;
 Borings and test pits performed by Jacobs Associates (Jacobs) for the West Hills Water Treatment Plant and Raw and Treated Water Pipeline Project (Jacobs, 2014); and  Test pits performed by HDR as part of the West Hills Access Road Design (HDR, 2014).

In addition, we reviewed the results of selected laboratory tests performed on samples taken from the Caltrans and Jacobs borings and test pits. The approximate locations of relevant borings, CPTs and test pits from these past studies are presented on Figures 1 through 5.

Borings and test pits performed by Jacobs at the WHWTP indicate that the near surface soil generally consists of sandy lean to fat clay extending to depths of about 3 to 5 feet at the time of exploration. Shallow bedrock was encountered underlying the clay at the treatment plant. The bedrock encountered was classified as moderately to heavily weathered claystone and sandstone.

Explorations performed along the treatment plant access road toward Union Road generally encountered lean clay with sand to depths of about 5 feet. Explorations performed closer to Union Road suggest that the lean clay layer becomes sandier, as indicated by clayey sand and silty sand encountered near the ground surface in borings B-3 and B-4. The lean clay/clayey sand layer is underlain by a very stiff to hard layer of lean to fat clay to depths of about 8 to 10 feet below grade. The lean to fat clay layer becomes sandier with depth, transitioning to a sandy lean clay for the reminder of the explorations’ depths. No historical explorations were available along the proposed pipe alignment along Union Road. Based on the referenced geologic map by Wagner et al, near surface material along Union Road is anticipated to consist of residual clayey and silty soil from Pliocene-age mudstone and sandstone.

San Benito County Water District | San Juan Bautista Transmission Pipeline Groundwater
hdrinc.com 2365 Iron Point Road, Suite 300 Folsom, CA 95630-8709 (916) 817-4700
4 Based on the geologic map, the remainder of the pipeline alignment runs through the San Juan Valley, an area underlain by Quaternary-age alluvium consisting of unconsolidated silt, clay and sand. CPTs performed by Caltrans along State Route 156 indicate that near surface soil in the area generally consists of silty sand/clayey sand underlain by clay, with interbedded layers of silt and silty sand.

Groundwater
Groundwater was not encountered or its depth was not determined in any of the historical explorations that were reviewed. SBCWD noted in their 2018 annual groundwater report that groundwater elevations in the project area range between about Elevation 160 to Elevation 180 feet from the western to eastern ends of the proposed alignment (SBCWD, 2018). Based on topographic maps of the area, this corresponds groundwater depths ranging from about 30 below existing grade at the western end of the alignment to well over 50 feet below existing grade in the eastern part of the alignment. Figure 8 presents the project site superimposed on the regional groundwater map of this portion of San Benito County.

Groundwater monitoring data presented in a 2009 Caltrans Preliminary Foundation Report for the San Juan Creek Bridge (Caltrans, 2009), located along State Route 156 near the western end of the proposed pipeline alignment, indicate groundwater levels ranging from about 25 to 39 feet. This is generally consistent with the groundwater depths estimated from the San Benito County regional groundwater map.

Groundwater monitoring data presented in a 2002 Caltrans Preliminary Geotechnical Report for the widening of State Route 156 through the San Juan Valley (Caltrans, 2002) indicate groundwater levels ranging from about 3 to 15 feet.

Jacobs noted in their WHWTP geotechnical investigation report that historic high groundwater levels are deeper than 50 feet at the water treatment plant site (Jacobs, 2014).

Preliminary Geotechnical Conclusions and
Considerations
Preliminary geotechnical-related conclusions and considerations are discussed in the following sections.

Groundwater
Historical investigations suggest that groundwater depths in the project area are generally at least 25 feet below existing grades along the western portion of the proposed alignment, and deepening toward the east. As described above, much shallower water level readings (as shallow as about 3 feet) have been reported in certain locations along State Route 156 in the San Juan Valley (Caltrans, 2002). Caltrans reported that these shallower water level readings may be from other sources, such as local agricultural activities. Although groundwater controls such as dewatering may not be anticipated for pipeline installation excavations, dewatering may be needed to control water from other sources, such as agricultural activities and surface runoff.

San Benito County Water District | San Juan Bautista Transmission Pipeline Preliminary Geotechnical Conclusions and Considerations hdrinc.com 2365 Iron Point Road, Suite 300 Folsom, CA 95630-8709 (916) 817-4700
5 Fluctuations in groundwater level could occur due to changes in seasons, variations in rainfall, agricultural activities, and other factors.

Seismic Hazards
The site is located in a seismically active region of California. Significant earthquakes in the area have been associated with movements along well-defined fault zones. Earthquakes occurring along any of a number of faults have the potential to produce strong ground shaking at the site.

Soil liquefaction is a phenomenon in which saturated (submerged), cohesionless soil experiences a temporary loss of strength due to buildup of excess pore water pressure during cyclic loading induced by an earthquake. The liquefaction susceptibility of a soil is a function of the gradation, density, aging/cementation, and fines content of the soil. The soils most susceptible to liquefaction are loose, clean, saturated, poorly (uniformly) graded sand, and nonto low-plasticity silt or silty sand. Denser soils are more resistant to liquefaction than looser soils, and soils with significant fines content are more resistant to liquefaction than clean soils.

Based on HDR’s review of the historical explorations, the majority of the project area between approximately Well No. 6 and San Juan Oaks Road is primarily underlain by alluvial silt, clay, sand. The remainder of the alignment east of approximately San Juan Oaks Road is underlain by shallow bedrock. The silt and sand could be considered to be susceptible to liquefaction with the presence of groundwater. Jacobs noted in their 2014 geotechnical investigation report that the potential for liquefaction at the WHWTP and along the access road to Union Road is very low to nil.

As noted above, the western end of the proposed pipeline at Well No. 6 is located within or very near the edge of the Fault-Rupture Hazard Zone for the San Andreas fault, as designated by the Alquist-Priolo Earthquake Fault Zoning Act (1972), as shown on Figure 7.

Excavation Considerations
Based on information presented on the logs of the Jacobs borings, excavations in the WHWTP area will likely encounter bedrock within the anticipated depth of excavations. The bedrock encountered in the borings generally ranges from severely weathered to decomposed claystone and sandstone with soil-like hardness characteristics. Conventional, heavy construction excavators equipped with rippers may be needed to excavate at least some of the rock. Based on the descriptions of the near surface bedrock, more specialized excavation equipment, such as hoe rams, are not anticipated to be needed.

Based on the available explorations by Caltrans, we do not anticipate bedrock will be encountered within the anticipated depths of excavation in the San Juan Valley area. It is anticipated that conventional heavy construction excavators will be able to excavate the soil in these areas.

San Benito County Water District | San Juan Bautista Transmission Pipeline Preliminary Geotechnical Conclusions and Considerations hdrinc.com 2365 Iron Point Road, Suite 300 Folsom, CA 95630-8709 (916) 817-4700
6 Temporary Excavations
Excavations will be required to construct the proposed pipeline. Due to spatial constraints and to reduce the amount of excavation required, we anticipate that temporary shoring may be used to perform at least some of the excavations. The shoring system should be designed by a qualified design professional experienced in shoring design.

All excavations that will be deeper than 5 feet and will be entered by workers should be shored or sloped for safety in accordance with applicable local, state, and/or federal safety regulations, such as the Occupational Safety and Health Administration (OSHA) guidelines (29 CFR Part 1926, Subpart P). The selection, design, and installation of the shoring system(s) or temporary excavation slopes needed for the project should be made the responsibility of the contractor.

If temporary slopes are selected, the contractor should be aware that in no case should slope height, inclination, and excavation depths exceed those specified in the applicable regulations.

The contractor, or responsible subcontractor, should determine temporary slope inclinations based on the subsurface conditions exposed at the time of construction. If temporary slopes are left open for extended periods of time, exposure to weathering and rain could have detrimental effects such as sloughing and erosion. We recommend that all vehicles and other surcharge loads be kept at least 10 feet away from the top of temporary slopes and that the temporary slopes are protected from excessive drying or saturation during construction.

Trenchless Excavations
From a geotechnical perspective, it is anticipated that the entire proposed pipeline can be constructed in excavated trenches with temporary slopes or shoring. However, trenchless pipeline installation may be needed at specific locations where trenching cannot be performed, such as at road crossings where road or lane closures are not possible. Based on the limited available information on subsurface conditions in the site area, we anticipate that trenchless jack and bore pipeline installation would be a suitable method. The jack and bore method consists of simultaneously advancing a horizontal pipe casing using hydraulic jacks while removing the soil using an auger inside of a casing. The method requires both a jacking and receiving pit. The casing is advanced toward the receiving pit by jacking against the back of the jacking pit. The casing supports the hole against collapse and the pipeline is installed within the casing.

Jack and bore operations have the potential to disturb the ground surface in the form of heave or settlement if sufficient cover over the pipe casing is not provided or if the removal of soil extends past the end of the casing. The casing should have sufficient soil cover during jack and bore operations to limit the potential for ground disturbance.

Temporary shoring will be needed to support the jacking and receiving pits. It is not anticipated that pit excavations would extend below the groundwater table. However, dewatering and control of water from other sources, such as irrigation, may be required.

From a technical perspective, other trenchless methods may also be suitable. However, it is anticipated that other methods may require more working space and/or be more costly. As the San Benito County Water District | San Juan Bautista Transmission Pipeline Limitations
hdrinc.com 2365 Iron Point Road, Suite 300 Folsom, CA 95630-8709 (916) 817-4700
7 project advances, additional information will be needed to further evaluate suitable trenchless methods, if such methods are to be needed. Determination of the trenchless method(s) used, if required, should be performed by a qualified contractor experienced in such methods and knowledgeable of the subsurface conditions at the site.

Limitations
This technical memorandum has been prepared for the use of San Benito County Water District and their consultants for specific application to the proposed treated water transmission pipeline from the West Hills Water Treatment Plant (WHWTP) to Well No. 6 in the City of San Juan Bautista in accordance with generally accepted geotechnical engineering practice. No warranty, express or implied, is made. The conclusions presented herein are based on the data available to HDR at the time of this memorandum. This memorandum does not reflect subsurface soil variations that may occur between the locations of the explorations or variations in groundwater conditions which may occur over a period of time. Variations in conditions may become evident during construction, at which time re-evaluation of the conclusions may become necessary. In the event of design changes in the project after this memorandum is submitted, the conclusions should be reviewed and possibly modified with HDR’s participation.

Historical explorations and testing performed by others were used. HDR cannot vouch for the accuracy of data and information obtained by others. The historical information and subsurface data by others that are referenced herein are an attempt to include data relevant to this project in one document.

This geotechnical study did not include an investigation regarding the existence, location, or type of possible hazardous materials. If any hazardous materials are encountered during construction of the project, the proper regulatory officials should be notified immediately.

References
California Division of Mines and Geology (1974), Revised official map of Alquist-Priolo Earthquake Fault Hazard Zones, San Benito Quadrangle, California Department of Conservation, California Geological Survey.

California Division of Mines and Geology (1986), Revised official map of Alquist-Priolo Earthquake Fault Hazard Zones, Hollister Quadrangle, California Department of Conservation, California Geological Survey.

Caltrans (2002), Memorandum, Preliminary Geotechnical Report, File 05-344900, San Juan Bautista 4-Lane, June 10.

Caltrans (2009), Memorandum, Preliminary Foundation Report – San Juan Creek Bridge No. 43-0029R, File 05-SBt-156-PM 3.0/R8.2, 05-344901, September 14.

HDR (2014), “Technical Memorandum, West Hills Water Treatment Plant, Access Road and Raw Water Pipeline Geotechnical Recommendations,” June 4.

San Benito County Water District | San Juan Bautista Transmission Pipeline References
hdrinc.com 2365 Iron Point Road, Suite 300 Folsom, CA 95630-8709 (916) 817-4700
8 Jacobs Associates (2014), “Geotechnical Engineering Investigation Report, San Benito County Water District, West Hills Water Treatment Plant, Hollister, California,” October 24.

San Benito County Water District (2018), “San Benito County Annual Groundwater Report,” prepared by Todd Groundwater, December.

United States Geological Survey (2008), “2008 National Seismic Hazard Maps - Source Parameters” based on the United States National Seismic Hazard Maps (NSHMP). <https://earthquake.usgs.gov/cfusion/hazfaults_2008_search/query_main.cfm> Wagner, D.L. et al (2002), “geologic Map of the Monterey 30’ x 60’ Quadrangle and Adjacent Areas, California,” California Department of Conservation, California Geological Survey.

CPT-01-006
CPT-01-007
CPT-01-8 CPT-01-9 CPT-01-10 CPT-01-12 CPT-01-13
CPT-01-14
CPT-01-3
CPT-08-001
CPT-08-002
CPT-08-004
CPT-01-4
CPT-08-006
CPT-01-005
CPT-08-008
B-08-006 B-08-005 B-08-007
B-08-004 CPT-08-005 B-08-008 CPT-08-003
Figure
Date

SAN BAUTISTA PIPELINE PRELIMINARY DESIGN

CONTRA COSTA COUNTY, CALIFORNIA

SAN BENITO COUNTY WATER DISTRICT
MAY 2021
1 HISTORICAL EXPLORATION MAP
CPT-01-15 CPT-01-16 CPT-01-17 CPT-01-18 CPT-01-19 CPT-01-20 CPT-01-21 CPT-01-22 CPT-01-23 CPT-01-24 CPT-01-25 CPT-01-26 Figure
Date

SAN BAUTISTA PIPELINE PRELIMINARY DESIGN

CONTRA COSTA COUNTY, CALIFORNIA

SAN BENITO COUNTY WATER DISTRICT
MAY 2021
2 HISTORICAL EXPLORATION MAP
CPT-01-27 CPT-01-28 CPT-0129 CPT-01-30 CPT-01-31 CPT-01-33 CPT-01-34 CPT-01-35 CPT-01-36 CPT-01-37 Figure
Date

SAN BAUTISTA PIPELINE PRELIMINARY DESIGN

CONTRA COSTA COUNTY, CALIFORNIA

SAN BENITO COUNTY WATER DISTRICT
MAY 2021
3 HISTORICAL EXPLORATION MAP

PIPELINE

PROPOSED

ALIGNMENT
CPT-01-38
CPT-01-39
B-3
HTP-1
Figure
Date

SAN BAUTISTA PIPELINE PRELIMINARY DESIGN

CONTRA COSTA COUNTY, CALIFORNIA

SAN BENITO COUNTY WATER DISTRICT
MAY 2021
4 HISTORICAL EXPLORATION MAP

PIPELINE

PROPOSED

ALIGNMENT
B-3
B-4
B-11
B-5
HTP-1
HTP-2
HTP-3
HTP-4
HTP-5
HTP-6
HTP-7
Test Pit 1
B-2 B-10
B-1
B-9 B-8
B-6
Test Pit 2
B-7
Test Pit 3
Figure
Date

SAN BAUTISTA PIPELINE PRELIMINARY DESIGN

CONTRA COSTA COUNTY, CALIFORNIA

SAN BENITO COUNTY WATER DISTRICT
MAY 2021
5 HISTORICAL EXPLORATION MAP

PIPELINE

PROPOSED

ALIGNMENT

WEST HILLS

WASTEWATER

TREATMENT PLANT

APPROXIMATE LOCATION OF EXPLORATORY
BORINGS BY JACOBS ASSOCIATES (2014)
LEGEND:

APPROXIMATE LOCATION OF EXPLORATORY
TEST PITS BY JACOBS ASSOCIATES (2014)
B-1

APPROXIMATE LOCATION OF EXPLORATORY
TEST PITS BY HDR (2014) HTP-3
Test Pit 1
Figure
Date

SAN BAUTISTA PIPELINE PRELIMINARY DESIGN

CONTRA COSTA COUNTY, CALIFORNIA

SAN BENITO COUNTY WATER DISTRICT
MAY 2021
6 FAULT MAP

PIPELINE

PROPOSED

ALIGNMENT

WEST HILLS WATER
TREATMENT PLANT WELL #6
MAY 2021

SAN BENITO COUNTY WATER DISTRICT

SAN BAUTISTA PIPELINE PRELIMINARY DESIGN

CONTRA COSTA COUNTY, CALIFORNIA

PROJECT SITE GEOLOGY MAP
Reference:

Wagner, D.L., Greene. G.H., Saucedo. G.J., Pridmore, C.L. (2002). Geologic Map of the Monterey 30’x60’ Quadrangle and Adjacent Areas, California., California Department of Conservation, California Geological Survey.

LEGEND:
7 MAY 2021

SAN BENITO COUNTY WATER DISTRICT

SAN BAUTISTA PIPELINE PRELIMINARY DESIGN

CONTRA COSTA COUNTY, CALIFORNIA
Reference:
[SBCWD] San Benito County Water District (2018). San Benito County Annual Groundwater Report.

Prepared by Todd Groundwater, December 2018.

Datum: NGVD29
Project Site

SAN BENITO COUNTY GROUNDWATER MAP
8 San Benito County Water District | San Juan Bautista Transmission Pipeline hdrinc.com 2365 Iron Point RoadSuite 300Folsom, CA 95630-8709 (916) 817-4700
Appendix B – Biological Constraints Memo
1 HDR
Technical Memorandum
Date: Friday, October 29, 2021
Project: City of San Bautista Transmission Pipeline
To: Mr. Jeff Cattaneo, General Manager
From: Summer Pardo, PWS, CWB
cc: Holly Kennedy, Tom Hoffman
Subject: Biological Constraints Analysis
Purpose
The purpose of this technical memorandum is to provide the San Benito County Water District (District) with refined details regarding potential impacts on federally listed species from the proposed City of San Juan Bautista transmission pipeline project (proposed pipeline), along with recommendations regarding consultation with the U.S. Fish and Wildlife Service (USFWS). The proposed pipeline is a new 10-inch-diameter, gravity-fed, treated water transmission pipeline that will extend approximately 6.75 miles from the West Hills Water Treatment Plant to the City of San Juan Bautista. The proposed pipeline is a key element of the City’s planned approach to comply with their settlement agreement with the U.S. Environmental Protection Agency over violations of the federal Clean Water Act.

Site Biology
A review of documented federally listed species occurrence records, available on the California Natural Diversity Database, revealed the presence of recent occurrences in the immediate vicinity (within 0.25 mile) of the proposed pipeline. Three federally listed species of particular concern – the California tiger salamander, California red-legged frog, and San Joaquin kit fox – were determined to have the highest likelihood of occurrence along the proposed pipeline. To further clarify the location and extent of suitable habitat for these species along the proposed pipeline, HDR biologists conducted a site visit on September 24, 2021.

The site visit determined that relatively high-quality habitat for the aforementioned species occurs along the access road from the West Hills Water Treatment Plant to its intersection with Union Road. Given the higher volume of disturbance generated by traffic on Union Road, suitability for the California tiger salamander, California red-legged frog, and San Joaquin kit fox declines somewhat along the segment of the proposed pipeline that follows Union Road and extends to the point at which the alignment encounters heavy agriculture, just west of the olive grove and San Juan Oaks Road. There is an occurrence for California tiger salamander right on Union Road dated 2006, approximately 0.35-mile southeast of its intersection with the treatment plant access road; however, the accuracy of the ranking is listed as fair in the California Natural Diversity Database. The remainder of the proposed pipeline is sited within or adjacent to heavily 2 HDR
used and managed agricultural roads. Please refer to figures provided in the Basis of Design Report for a visual representation of the proposed pipeline and relevant landmarks.

Adjacent Site Biology
A portion of the proposed pipeline is associated with agricultural roads but is immediately adjacent to open grasslands that would be considered suitable habitat for the California tiger salamander, California red-legged frog, and San Joaquin kit fox. During the site visit it was documented that the adjacent grasslands were enclosed in silt fence with wildlife escape ramps incorporated into the structure. Further discussion revealed that the adjacent suitable grasslands were slated for development associated with the San Juan Oaks senior housing facility beginning in October 2021. Additional desktop research determined that impacts on and mitigation for California tiger salamander, California red-legged frog, and San Joaquin kit fox habitat were analyzed under a previous consultation and biological opinion issued by USFWS for the senior housing facility. In addition, extensive relocation efforts for these federally listed species have already been undertaken, prior to initiation of ground disturbance activities; as a result, the suitability of the adjacent grassland habitats through this segment of the proposed pipeline would be considered similar to fully developed lands.

Potential Impacts
Given the highly impacted nature (heavy rotation agriculture) of the vast majority of the proposed pipeline, there is limited potential for impacts on California tiger salamander, California redlegged frog, and San Joaquin kit fox; however, the portion of the proposed pipeline from the water treatment plant to just west of the olive grove encounters a higher likelihood of conflict with these species due to higher relative habitat value and proximity of recent occurrence records. To minimize impacts on suitable habitat from the water treatment plant to west of the olive grove, the proposed pipeline has been sited in the water treatment plant access road, in Union Road under the FOG line, and will be installed using trenchless techniques under Union Road and the olive grove. Although the access road and Union Road are considered disturbed/developed habitats, USFWS could consider trenching activities for this portion of the proposed pipeline an impact on California tiger salamander, California red-legged frog, and San Joaquin kit fox habitats.

U.S. Fish and Wildlife Service
Impacts on federally listed species habitats trigger the need for compliance with the Endangered Species Act. The site visit confirmed that the proposed pipeline would not result in impacts on waters of the U.S., which indicates that no nexus with this federal agency exists for the proposed pipeline. In the absence of a Corps federal nexus, the only other option would be to explore whether the U.S. Environmental Protection Agency (EPA) would be willing and able to take on the lead federal agency role for USFWS consultation regarding the proposed pipeline and its effects on the federally listed species.

If the EPA is willing to function as the lead federal agency, then Section 7 consultation with USFWS would be possible. Under Section 7 consultation, USFWS is bound by statutory review timelines that require consultation to be complete in 135 days. If the EPA, is not willing and able to function as the lead federal agency, consultation with USFWS would still be required, but via a Section 10 Endangered Species Act consultation and/or technical assistance process. The 3 HDR
Section 10 consultation process can be somewhat long and arduous as there are no statutory timeframes binding USFWS to complete reviews within specified timeframes; therefore, this process can take anywhere from 8 – 24 months.

Recommendations
Given the time sensitivity of the proposed pipeline for compliance with the Clean Water Act, HDR is recommending early coordination with the EPA to determine if they can function as the lead federal agency for USFWS consultation. If the EPA will function as the lead federal agency, then HDR recommends we hold a pre-consultation meeting with USFWS to describe the project, findings of the September 2021 site visit, and proposed avoidance and minimization measures.

The purpose of this meeting will be to allow USFWS to provide early comments on the project, which allows us to pre-emptively address their concerns in a Biological Assessment report. This early coordination and incorporation of information into the Biological Assessment to address USFWS comments, serves to streamline the overall consultation process once initiated by the EPA. With this regulatory pathway, it is anticipated that the USFWS consultation process could be completed within 6 months of the EPA initiating consultation with USFWS.

If the EPA is not able to function as the lead federal agency, HDR recommends that we use the data already collected during the September 2021 site visit to prepare a site assessment report in accordance with USFWS requirements for the relevant species, including a description of the proposed pipeline activities and proposed avoidance and minimization measures. This report would then be submitted to USFWS with a request for review and recommendations regarding whether, with implementation of the proposed pipeline as described or with additional avoidance and minimization measures recommended by USFWS, the District could install the proposed pipeline without exceeding federally listed species take thresholds and thereby avoid the need for Section 10 consultation.

The outcome of the proposed USFWS technical assistance process, would be a letter from USFWS documenting their concurrence with our findings; documenting concurrence with our findings but adding avoidance and minimization measure requirements to stay below take thresholds; or stating Section 10 consultation is required. USFWS is not well equipped to handle Section 10 consultations, so they are more apt to work with a project proponent to identify solutions that will keep a project below federally listed species take thresholds, thus keeping their involvement at the technical assistance level in lieu of triggering Section 10 consultation.

If USFWS agrees with our findings, and states no Section 10 is required, then the proposed technical assistance process could be completed in 3-6 months. If USFWS responds to the technical assistance request stating that Section 10 consultation is required, the technical assistance process is still a valuable endeavor to obtain questions, comments, and concerns related to the project that can inform the development of a Habitat Conservation Plan and associated National Environmental Policy Act document to support and streamline the Section 10 consultation process. Based on the heavily disturbed nature of the proposed pipeline footprint, it is likely that the technical assistance process with USFWS would allow us to bring the level of impact down significantly enough to fall within the thresholds for a low-effect Habitat Conservation Plan, which can typically be completed in less than 12 months. 4 HDR
Thank you for allowing HDR the opportunity to assist the District in this important project. Please feel free to contact Summer Pardo at (916) 217-7350 or [email protected], if you would like to discuss the findings presented herein further.

San Benito County Water District | San Juan Bautista Transmission Pipeline hdrinc.com 2365 Iron Point RoadSuite 300Folsom, CA 95630-8709 (916) 817-4700
Appendix C – Horizontal Directional Drilling
1 HDR
Horizontal Directional Drilling
Horizontal directional drilling (HDD) will be utilized to cross under Union Road and the olive grove and in areas where excavation will significantly disturb traffic or commerce or is deep enough that trenching is cost prohibitive.

Installation is flexible enough to be able to plan excavation areas in advance and avoid areas with existing surface obstructions or areas with sensitive species.

Horizontal directional drilling process
The HDD process includes three stages: 1) pilot bore; 2) reaming; and 3) pullback as shown in Figure 1. The pilot bore is drilled along the planned alignment from entry to exit. The bore begins with a straight tangent section declined at an angle of entry of 8 to 16° to the ground surface. That section is needed to gain enough depth to provide better steering. The cover achieved within the straight tangent section also provides a reduction in hydrofracture and heave and settlement risk. The drill head is then steered in an upward curve transitioning into a horizontal segment before turning upward again and continuing to the exit point along an incline at the angle of exit of 5 to 12° to the ground surface. Bends must be minimized along individual drilling segments as it can overstress the drill pipe and product pipe, or significantly increase the necessary thrust/pull force on the drill rig. Bend radius and stress calculations related to the product pipe are important parts of the design that can be compared to the manufacturer’s specifications for allowable bend radius. Typically, with plastic pipe installation the minimum bend radius will not exceed that of the drill pipe. An industry standard for determining the design radius of curvature for bends used in HDD installation is to multiply the nominal diameter in inches by 100 to determining the allowable radius in feet. Small pits are excavated at the entrance and exit points to facilitate containment of drilling fluids and entry of the pipe during pullback operations.

Figure 1: HDD boring process
2 HDR
The reaming process involves enlarging the pilot bore to facilitate installation of the product pipe. A reamer is attached to the drill pipe and then rotated and pushed or pulled back through the pilot bore to enlarge the bore in one or more reaming passes. The number of reaming passes (commonly varies from zero to three) depends on the diameter of the product compared to the diameter of the pilot bore, ground conditions, and driller preferences.

The pullback operation involves pulling the entire drill length in one segment back through the drilling mud along the reamed-hole pathway as shown in Figure 2. Proper pipe handling, cradling, bending minimization, surface inspection, and fusion welding procedures need to be followed. Axial tension force readings, constant insertion velocity, mud flow circulation/exit rates, and footage length installed are recorded. The pullback speed ranges usually between 1 to 2 feet per minute.

Figure 2: HDD pullback process
Ground Conditions
HDD installations can be completed in most ground conditions since tooling and drilling fluid design can be matched to the anticipated geology. Ideal conditions are medium to stiff clays, which provide the best steering response. Additionally, because the goal is to suspend and transport the cuttings to the surface entrance or exit pits, drilling through cobbles and gravels can pose challenges, as the large particles tend to drop to the bottom of the borehole. Drilling in rock can be accomplished if it is identified ahead of time. Testing to obtain unconfined compressive strength and abrasivity is critical in ensuring that the correct drill bits and reamers are selected.

Work Area
Required work area is dependent on product pipe size and length of installation, which dictates sizing of drill rigs and ancillary equipment. Rig side work areas are generally 20 x 60 ft for installations involving small drill rigs (<40,000 lbs thrust/pullback), and 100 x 150 ft for medium rigs (40,000 – 100,000 lbs thrust/pullback, similar to the one shown in Figure 3). For this application, a drill rig with thrust/pullback less than 100,000 lbs is expected. There is enough space outside the roadway for the drill rig and pipe laydown. 3 HDR
Figure 3: Example medium sized drill rig (up to 100,000 lbs thrust/pullback) Drilling Fluid
Drilling fluids and additives are an integral component of any HDD installation. Proper design of fluids to match anticipated geological conditions is critical to project success. Drilling fluids are comprised of water with small percentages of bentonite clay (sodium montmorillonite) or polymers and may include other additives to enhance performance. For example, when drilling in loose cohesionless formations, an additive can be mixed into the drilling fluid to provide added gel strength and enhance bore stability, while reducing fluid losses to the formation.

There are numerous field and laboratory tests that may be conducted on drilling fluids to ensure proper performance. It should be noted that fluid design can be changed (or adjusted) during drilling operations if geological conditions change. Additionally, care must be taken to control downhole fluid pressures to reduce the likelihood of hydrofracture. Hydrofracture and inadvertent drilling fluid returns can lead to surface heave, damage to existing structures, and drilling fluid encountering sensitive features.

Accuracy
Guidance during the pilot bore is based on "real-time" information on drill head positioning provided by either a walkover or non-walkover system. Regardless of the system used, the information provided includes magnetic bearing or azimuth, pitch, and clock-face position of the steering tool. Walkover systems involve interpretation of data captured through an electromagnetic signal from a transmitter mounted at the drill head by a surface handheld receiver. Non-walkover systems involve the use of a steering tool mounted in a non-magnetic drill collar or drill pipe section behind the drill bit. The signal is transmitted from the probe to the operator control cabin at the surface through a wire inside the drill pipe. Tracking accuracy of non-walkover systems can often be significantly improved by using a supplemental surface monitoring system consisting of surveyed wire coil laid out in a grid. This coil is periodically energized with an electrical current that creates an induced magnetic field that transmits additional location data to the control cabin at the surface. Appropriate steering inputs can then be made to maintain the bore along the design drill path. Steering corrections should begin 4 HDR
promptly when deflections are detected or changes in the bore path's direction are needed. The corrections should be gradual and remain within the allowable bend radius.

ATTACHMENT 2: Possible U.S. EPA Region 9 Grant Award

POST-AWARD CHECKLIST & REMINDERS USEFUL EPA GRANT RESOURCES Applying for a Grant
• EPA Grants Management Training for
Applicants and Recipients
An online training course that covers the complete grant cycle from initial application to closeout.
• EPA Grants Webinars
Grant trainings provided by the EPA Office of Grants &
Debarment.
• How to Fastrack Your Grant Application
Package for Awards Review & Approval
EPA Region 9 checklist for securing a grant.
• Grantee Forms
Grant application and reporting forms you can download. • How to Develop a Budget
An online training course on how to prepare a grant
budget and workplan.

Managing a Grant and Closing out a Grant
• Best Practice Guide for Procuring Services,
Supplies, and Equipment Under EPA
Assistance Agreement
Procurement guidelines for administering EPA grant
funds.
• EPA Region 9 Grants Handbook
A handy grant reference guide covering preaward,
postaward and closeout topics.

U.S. Environmental Protection Agency - Region 9
75 Hawthorne Street, San Francisco CA 94105
Serving Arizona, California, Hawaii, Nevada, Pacific Islands and 148 Tribes June 2022
 In meeting the 21-day award acceptance, do I
understand and agree with the administrative and
programmatic terms and conditions of the grant?
Yes/No
 My grant workplan/performance-progress reports are
due to my Project Officer:

Quarterly/Bi-annually/Annually
The due date(s) is/are ____________________
 The due date for submitting my bi-annual/quarterly or annual Federal Financial Report (FFR) Form F425 to the
Research Triangle Park Finance Center (rtpfc-grants.gov) is ___________________________________________
The final FFR for it is due on ______________________
(Required 120 days after grant expires)
 Does the grant require a MBE/WBE annual reporting
with a due date of October 30 to grantsregion9.gov?
Yes/No
Congratulations
on Your
U.S. EPA Region 9 Grant Award!
What to expect
Congratulations on your EPA grant! Now, you’re ready to roll up your sleeves and begin working on your environmental project. But first, there are a few things to know. All EPA grant recipients must comply with the Uniform Administrative
Requirements, Cost Principles, and Audit Requirements for Federal awards under 2 CFR Part 200, 2 CFR Part 1500, 40 CFR Part 33, and if applicable, 40 CFR Part 35. Even if you’ve received an EPA grant before, it’s important that you carefully review the terms and conditions of the grant, which includes general, administrative, and programmatic terms and
conditions. The grant award includes the contact information for your EPA Project Officer (PO) and Grants Specialist (GS) who will help you successfully manage your grant.

What are my EPA grant recipient
responsibilities?
1 Read and review the grant award document. You accept the terms and conditions of the grant when you:
• start drawing down funds within 21 days after the award date or
• do not send a letter disagreeing with the grant’s terms and conditions within 21 days of receiving the award
2 If this is your first EPA grant, register on the grant payment system. You will receive a form from EPA Research Triangle Park Finance Center (RTP-FC) to establish your account. 3 When drawing down funds, ensure they’re approved and
permitted under the workplan activities. Grant drawdowns must only be for actual and immediate cash needs and must be tied to workplan commitments/components.
4 Submit your biannual, quarterly or annual performance/ project reports on time and keep in touch with your EPA Project Officer.
5 Submit your annual and final Federal Financial Reports (Form SF425) on a timely basis by emailing RTPFC at rtpfc[email protected] 6 Review the administrative terms and conditions of your grant to find out which month your FFR report is due (either June 30 or December 30). If required, submit the annual Minority Business Enterprise Woman-owned Business Enterprise report (Form 5700-52A) to [email protected], which is due every Oct 30.

If you plan on issuing a subaward, you must comply with several applicable federal grant provisions. There’s also a subaward reporting requirement.

Need more information? Refer to EPA’s General Terms and Conditions on Establishing and Managing Subawards and EPA’s Subaward Policy.

What are the rules and guidelines for
purchasing goods and services under my
grant?
You must comply with the procurement requirements for
federal grants. In addition, EPA’s Best Practice Guide for Procuring Services, Supplies & Equipment Under EPA Assistance Agreement provides helpful information regarding the rules for purchasing goods and services.

How do I address post-award issues in my
grant project?
We want you to succeed in advancing EPA’s mission of
protecting human health and the environment. EPA’s Project Officer and Grant Specialist are here to help you with your grant.

Your Project Officer helps you with programmatic and technical issues, monitoring activities, progress in meeting outputs and outcomes, and resolving issues with your grant. Your Grants Specialist helps you with administrative policies, regulations and oversight of your assistance agreement.

It’s important to keep in touch with your Project Officer for various grant issues including but not limited to completing your grant, workplan or budget. Certain changes to your workplan or budget may require EPA prior written approval so you will need to work with both your Project Officer and Grants Specialist.

What do I need to know about grant
monitoring and audits?
EPA reviews and monitors your grants. In some instances, the EPA Grants Branch or the EPA Office of Inspector General (OIG) may conduct a formal audit of your grant. Our offices
undertake these activities to ensure that grant funds are used properly. Examples of documents that we may review are your administrative reports, performance/project reports, drawdown activities, invoices, and your workplan commitments/
components.

To ensure your grant passes a review or the audit complies with regulatory requirements you must: Set up a comprehensive and organized grant file, maintain a sound financial management system (acceptable accounting system, internal controls and accurate time records), establish written policies, follow procurement rules and keep copies of signed approvals,
receipts and source documents.

I’ve completed all requirements of the
grant project. How do I close out the grant?
Congratulations on reaching this milestone! Federal regulations require that you close out the grant within 120 days after the performance period ends. Submit the following documents to close out the grant:
• Final Performance/Project Report
• Final Federal Financial Report
• Final MBE/WBE Report (if applicable)
• Personal Property Report and disposition instructions (if applicable)
• Any additional report or deliverables identified in the terms and conditions of the award.
• Liquidate all obligations incurred under the grant (e.g. pay vendors within 120 days of the end of the performance period) The Research Triangle Park Finance Center, the EPA Program Office and the Grants Branch will conduct their closeout process of your expired grant. The grant is officially closed when all three offices have certified and completed their closeout actions.
(Placeholder photo inspiration)
ATTACHMENT 3: Possible Phasing Plan
LIMITS OF UNION ROAD OVERLAY PROJECT:

HIGHWAY 156 TO APPROX. 200' PAST GORDON WAY

CITY OF SAN

JUAN BAUTISTA

CITY OF

HOLLISTER

CITY OF SAN JUAN BAUTISTA -
WELL 6 SITE

SAN BENITO COUNTY WATER DISTRICT -

WEST HILLS WATER TREATMENT PLANT

UNION ROAD
NEW HIGHWAY 156
OLD HIGHWAY 156
(FUTURE COUNTY FRONTAGE ROAD)

ACCESS ROAD

MISSION VINEYARD ROAD

SAN JUAN HOLLISTER ROAD
PHASE 1: DISTRICT DESIGNED AND CONSTRUCTED
TO WHWTP GATE. COORDINATION REQUIRED

BETWEEN CITY CONSULTANT AND HDR/DISTRICT

FOR CONNECTION POINT
PHASE 2: DISTRICT WTP ACCESS ROAD -

FROM WHWTP GATE TO UNION ROAD
PHASE 3: UNION ROAD - HIGH PRIORITY

FOR COUNTY PAVING PROJECT
PHASE 4: UNION ROAD - FUTURE FRONTAGE

ROAD - MISSION VINEYARD ROAD - SAN JUAN
HOLLISTER ROAD - WELL 6 SITE

LOCATION OF HDD REQUIRED IN CALTRANS ROW

CITY OF SAN JUAN BAUTISTA

WATER TRANSMISSION MAIN PROJECT

PHASING PLAN
1000' 0' 1000'
SCALE: 1"=1000'

PHASING PLAN
Item: 3.A (i)
City Council Meeting
March 25, 2025
Page | 1

CITY OF SAN JUAN BAUTISTA

CITY COUNCIL STAFF REPORT
DATE: MARCH 25, 2025
DEPARTMENT: CITY MANAGER
FROM: ASHLEY COLLICK, INTERIM CITY MANAGER
BY: GABE ARONOW PE, DESIGN ENGINEER
TITLE: WASTEWATER PIPELINE UPDATE
RECOMMENDED MOTION:

Receive a presentation on the Wastewater Treatment Plant and Infrastructure Improvement Project.

PROJECT OVERVIEW:

This project was undertaken to address several critical issues impacting the City’s wastewater treatment operations. The primary drivers for this project include water quality concerns, the deteriorating condition of the existing wastewater treatment plant, and compliance issues, including Notices of Violations (NOVs) and fines imposed by the Regional Water Quality Control Board (Regional Board). This project is essential to bringing the City’s wastewater infrastructure into compliance with regulatory standards and improving overall service delivery.

Project Elements:

Infrastructure Improvements:
• New Pump Station: A new pump station will be constructed at the existing treatment plant site to convey City of San Juan Bautista wastewater to the City of Hollister’s wastewater treatment plant.
• Force Main Installation: A new force main will be laid along County roads, connecting the new pump station to the City of Hollister’s influent manhole, as part of the to convey conveyance system.
• Upgrades to Influent Screen and Pumps: The existing influent screen and pumps will be upgraded and repurposed as storage pumps, enhancing the plant’s capacity to handle wastewater flow effectively.

Page | 2
• Storage Improvements: the existing treatment ponds will be repurposed to serve to provide emergency storage, and infrastructure for pipe flushing will be incorporated to maintain operational capacity.
• Decommissioning of Existing Infrastructure: The old infrastructure, which will be replaced by the new pump station facilities, will be properly decommissioned demolished to streamline new operations.
• Site Improvements: Various site improvements, including grading and paving at the pump station site, and resurfacing and striping along County roads, will be carried out to ensure safe and effective access to the new City and along County roads.

Non-Infrastructure Elements:
• Environmental Permitting and Compliance: Environmental permitting, mitigation, and monitoring will be required throughout the construction phase, ensuring the project adheres to all regulatory and environmental standards.
• Funding Approvals: The project will be funded through a combination of USDA project approval and funding, SRF grants, and a Regional Board Environmental Compliance Project. Notably, this compliance project allows the violation fines to be directed toward the project itself rather than being paid to the State. • Sludge Management: Existing sludge (a product of wastewater treatment) in the current ponds will be assessed and managed to leave them empty and available for emergency storage.

Project Status:

Completed Work to Date:
• Assessments and planning have been completed, including the evaluation of environmental impacts (CEQA) and permitting requirements.
• Approvals have been secured for USDA funding and SRF grants. • Environmental Mitigation impacts have been paid
Environmental permits have been secured, requiring on-going monitoring during construction.
• Final design is complete and the project bid
• Construction work is considered 78% complete, based on construction completed • Construction Completed includes:
o 100% of the force main
o The wet well and pumps
Item: 3.A (i)
City Council Meeting
March 25, 2025
Page | 3
o Procurement of the new screen and storage pumps (they cannot be installed until the existing treatment plant comes offline)
o Tie-in to the Hollister manhole
o Piping on the new pump station site
o Electrical conduit and initial equipment
o Standby generator
Remaining Work:
• Completion of electrical controls and switch gear
• Installation of the new screen and storage pumps
• Resurfacing of the existing wet well
• Installation of the odor control system
• Installation of the emergency storage return pump station • Storage improvements
• Ongoing environmental monitoring and reporting during construction. • Decommissioning of old infrastructure and final site improvements. • Sludge management and disposal.

Timeline:
• Planning occurred in 2020-2021
• Design started in 2022
• Started construction in August 2024
• The project is expected to be operational Summer 2025. Sludge removal will extend into 2026.

Budget:
• The project’s 25-million-dollar budget is fully funded, with resources allocated for construction, permitting, and contingency. The funding sources include the USDA project approval, SRF grants, and Regional Board fines redirected to the project.

Conclusion:

This project is a critical step in ensuring the City’s wastewater treatment plant meets water quality standards, resolves ongoing compliance issues, and improves the overall reliability and efficiency Page | 4
of the system. The work completed to date sets a solid foundation, and the remaining tasks will address the infrastructure and environmental needs to ensure long-term operational success.

The city is committed to adhering to all regulatory requirements while utilizing available funding sources to complete this important project.

Item: 3.A (iii)
City Council Meeting
March 25, 2025
Page | 1

CITY OF SAN JUAN BAUTISTA

CITY COUNCIL STAFF REPORT
DATE: MARCH 25, 2025
DEPARTMENT: CITY MANAGER
FROM: ASHLEY COLLICK, INTERIM CITY MANAGER
BY: DMITRY SEMONOV, RIDGELINE MUNICIPAL STRATEGIES
TITLE: WATER AND WASTEWATER COMPLIANCE PROJECTS:

FUNDING UPDATE
RECOMMENDATION:

Receive a presentation on the water and wastewater compliance projects.

PRESENTATION OVERVIEW:

Funding Update:
• Wastewater System
• Drinking Water Pipeline
• Water Funding Strategy
Water and Wastewater
Compliance Projects:

Funding Update
March 25, 2025
Municipal Advisory | Financial Planning | Pension Optimization City of San Juan
Bautista
City of San Juan Bautista – Water and Wastewater Compliance Projects: Funding Strategy Update 03/25/2025 2 Wastewater System Compliance Project
• Pipeline to convey City’s wastewater to
Hollister’s Regional Treatment Plant
• Total project budget: $25,205,000
Funding Sources Amount
Grants
EPA Grant $1,000,000
State Funding Allocation $3,000,000
USDA Grants $6,527,000
Subtotal: Grants $10,527,000
Debt - USDA Loan $10,268,000
San Benito Co Contribution $4,000,000
STBG Funding $410,000
TOTAL $25,205,000
City of San Juan Bautista – Water and Wastewater Compliance Projects: Funding Strategy Update 03/25/2025 3 Wastewater Project Debt: USDA Loan
• USDA Loan:
• Loan amount: $10,268,000
• 40-year term
• 2.75% interest rate
• Annual payment: ≈$426,500
• The most cost-effective way to finance the Project
City of San Juan Bautista – Water and Wastewater Compliance Projects: Funding Strategy Update 03/25/2025 4 Water System Compliance Project
• Pipeline to import water from West Hills
Water Treatment Plant (San Benito County
Water District)
• Current Budget: ≈$15 million (preliminary)
• Not included:
• Microvi (≈$750,000)
• ADRoP (≈$2.56 million)
Description 2024 Budget
Hollister Urban Area Project Buy-In $3,000,000
Construction Costs $9,000,000
WTP Capital Reserve Contribution $360,000
Water Blending Equipment $150,000
Water Softeners Buy-Back $200,000
ROW Acquisition $50,000
Soft Costs $1,600,000
Financing Fees $240,000
Construction Interest $400,000
TOTAL PROJECT COST $15,000,000
City of San Juan Bautista – Water and Wastewater Compliance Projects: Funding Strategy Update 03/25/2025 5 Water Funding Strategy
• Priority #1: Grants and Earmarks
• FY 2025:
• $1.1 million Lofgren earmark (cancelled through Congress’ Continuing Resolution – all earmarks) • $10 million ACOE WRDA – unfunded authorization
• State did not award any funds to anyone
• FY 2026:
• New earmark applications to Fed and State
• CDBG application
• Interviewing for grant writing services
• Monitoring California Climate Bond process
• Community income survey
City of San Juan Bautista – Water and Wastewater Compliance Projects: Funding Strategy Update 03/25/2025 6 Water Funding Strategy
• Priority #2: Project Design
• RFP ready to be released
• Initially expected to pay for by $1.1 Lofgren earmark + City cash / other grants • City has built up water fund cash – sufficient to pay for the design • Pay with cash and seek reimbursement through earmarks later, BUT earmark funding is not guaranteed
• Having a shovel-ready project increases chances of future funding City of San Juan Bautista – Water and Wastewater Compliance Projects: Funding Strategy Update 03/25/2025 7 Water Funding Strategy
• Priority #3: Debt Financing
• USDA has proven to be a good partner – have begun conversations • State Revolving Fund – requires substantial design progress • Bonds or bank loans if needed
City of San Juan Bautista – Water and Wastewater Compliance Projects: Funding Strategy Update 03/25/2025 8 Additional Projects: Microvi
• Estimated Total Cost: ≈$750,000
• Potential Funding Sources:
• Bureau of Reclamation Grant secured by Microvi
• Earmarks / Other Grants
• If all else fails – roll into overall Water Compliance Project City of San Juan Bautista – Water and Wastewater Compliance Projects: Funding Strategy Update 03/25/2025 9 Additional Projects: ADRoP
• Estimated SJB Cost Share: ≈$2.56 million
• Potential Funding Sources:
• Grant / Earmark Funding – above and beyond Water Compliance Project funding • District willing to fund ADRoP project and be paid back thru monthly charges • Estimated PRELIMINARY total annual cost of $87,000 or ≈$9.10 per account per month • Not covered by current rate structure
03/25/2025 10
Questions?
Dmitry Semenov
Ridgeline Municipal Strategies, LLC
(916) 250-1590
[email protected]
RidgelineMuni.com

San Juan Bautista City CouncilMarch 25, 2025

San Juan Bautista City Council
March 25, 2025