TO:Andrew P. Powers, City Manager
FROM:Nader Heydari, Public Works Director
DATE:July 7, 2026
SUBJECT: Hill Canyon Treatment Plant Miscellaneous Repairs FY 2025-27 (MI 2646)
RECOMMENDATION:
1. Authorize staff to advertise for construction bids for the Hill Canyon Treatment Plant (HCTP) Miscellaneous Repairs FY 2025-27 (MI 2646).
2. Find that the project is Categorically Exempt from California Environmental Quality Act pursuant to 14 CCR 15301 (repair/maintenance of an existing facility).
LEVINE ACT ITEM: No
FINANCIAL IMPACT:
No Additional Funding Requested. $500,000 is available in the Adopted FY 2026-27 Wastewater Capital Fund Budget for HCTP Miscellaneous Repairs FY 2025-27 (MI 2646). The estimated project cost is $290,000.
BACKGROUND:
The City’s HCTP is located at 9600 Santa Rosa Road, in a canyon in the northwest section of the City and sits at the confluence of the North and South Arroyo Conejo Creeks (Attachment #1). The facility has two reinforced concrete flow equalization basins (FEB) near the south headworks and a cover over the chlorine contact channel. The FEBs hold wastewater that enters the plant when there is an exceedance in capacity during daily high flows, storm events, or when staff are attempting to maximize portions of the treatment process and some of the incoming flow needs to be temporarily stored. The FEBs are an important resiliency and safety measure that allow flexibility in managing the plant’s treatment flows.
HCTP also has a chlorine contact channel (CCC) that is covered with concrete panels. The panels help reduce debris entering the channels (e.g., dust, leaves), to improve water quality issues.
HCTP Miscellaneous Repairs FY 2025-27 (MI 2646)
July 7, 2026
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DISCUSSION/ANALYSIS:
Over time, the caulking on the FEBs’ reinforced concrete expansion joints fails when exposed to sunlight or when submerged in aggressive environments (e.g., wastewater). As part of regular maintenance, the caulking and backer rod material must be removed and replaced. The project includes the removal of existing caulking material and backer rod from the reinforced concrete expansion joints at the FEB and CCC, and replacement with new caulking and backer rod materials.
The caulking provides a seal at the expansion joints and helps preserve the reinforced concrete. The proposed caulking is anticipated to last up to 10 years before replacement is warranted.
The project plans and specifications are complete and available for review upon request to the Public Works Department by e-mail at [email protected] or by phone at (805) 449-2400.
Staff recommends that this project be advertised for bid. Once bids are received, staff will make a recommendation at a future City Council meeting for the award of the construction contract.
The overall project cost (including contingencies, design and engineering support services during construction/testing, and project management) is estimated at $290,000.
A summary of the estimated project cost is shown below.
ESTIMATED PROJECT COST SUMMARY
Design and Engineering (previous) $ 15,000
Design Services During Construction (future) $ 25,000 Construction + Contingency Estimate (future) $ 250,000 Total Estimated Project Cost $ 290,000
The tentative schedule for completion of the project is as follows:
Bidding July 2026
Award of Construction Contract August/September 2026
Start of Construction October 2026
Construction Completion December 2026
HCTP Miscellaneous Repairs FY 2025-27 (MI 2646)
July 7, 2026
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Community Outreach: This project will be limited to work at the HCTP and is not expected to impact neighboring residences. The work will be at the south end of the plant and will have a limited impact on plant operation. Construction-related impacts on hiking trail users will be minimal.
This project meets City Council’s Top Ten Priorities #9, “Public Works Infrastructure & Sustainability.”
CIP PROJECT PRIORITY (as outlined in FY 2025-26 and 2026-27 CIP Program Budget)
Priority Two – Necessary, but not essential, and there could be consequences if deferred.
COUNCIL GOAL COMPLIANCE:
Meets the following City Council goals:
C. Operate City government in a fiscally and managerially responsible and prudent manner to ensure that the City of Thousand Oaks remains one of California's most desirable places to live, work, visit, recreate, and raise a family.
F. Provide and enhance essential infrastructure to ensure that the goals and policies of the Thousand Oaks General Plan are carried out and the City retains its role and reputation as a leader in protecting the environment and preserving limited natural resources.
PREPARED BY: Paul Weinstein, Associate Analyst
Attachments:
Attachment #1 – Vicinity and Location Maps
DPW: 850-20\ev\Council\2026\070726\MI2646\ HCTP Miscellaneous Repairs FY 2025-27 Project staff report.docx