TO:Andrew P. Powers, City Manager
FROM:Nader Heydari, Public Works Director
DATE:April 14, 2026
SUBJECT: Permanent Disinfection Boosting Systems at La Granada Reservoir (CI 5771) and Lang Ranch Reservoir (CI 5791)
Projects
RECOMMENDATION:
1. Authorize staff to advertise the Permanent Disinfection Boosting Systems at La Granada Reservoir (CI 5771) and Lang Ranch Reservoir (CI 5791) projects for construction bids.
2. Find that this action is not a project as defined under the California Environmental Quality Act.
LEVINE ACT ITEM: No
FINANCIAL IMPACT:
No Additional Funding Requested. $858,270 is available in the FY 2025-27 Water Capital Fund for the Improvements at the La Granada Reservoir (CI 5771), including $38,270 in FY 2025-26 and $820,000 in FY 2026-27. $876,758 is available in the FY 2025-27 Water Capital Fund for the Improvements at the Lang Ranch Reservoir (CI 5791) projects, including $56,758 in FY 2025-26 and $820,000 in FY 2026-27. The construction cost is estimated at $1,019,800 for CI 5771 and $933,300 for CI 5791. Therefore, additional appropriation from Water Capital Fund Budget may be required at the time of construction award depending on the actual bids received.
BACKGROUND:
The City’s Public Works Department manages the City’s water storage and distribution facilities consisting of 11 Calleguas turnouts (connections to the Calleguas Municipal Water District supply), four hydropneumatic pump stations, 16 pump stations, 16 reservoirs, and two boosting stations. Many of these sites need improvements to address enhanced wildfire resiliency, site drainage, accidental tank overflow containment, pump and electrical equipment enclosures,
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fencing, and the addition of emergency generators and disinfection boosting stations.
In December 2023, Kennedy/Jenks Consultants Inc. (K/J) concluded a comprehensive citywide Water Storage Optimization Study, addressing water quality improvements within the City's water distribution network due to reduced demand and longer water age in the reservoirs after the 2022 drought. The study identified La Granada and Lang Ranch Reservoirs as high-priority sites for the installation of a permanent disinfection boosting system, following Willow and Pederson Reservoirs, which were completed in 2025.
On November 4, 2025, City Council approved a Professional Services Agreement (under CI 5791 and CI 5771) to AECOM Technical Services Inc. (AECOM) of Westlake Village, CA (Contract No. 14129-2025) in the amount of $115,600 for the design, including Plans, Specifications, and Estimate (PS&E), and construction bid support services required for the Permanent Disinfection Boosting Systems at La Granada and Lang Ranch Reservoirs.
The proposed improvements at the pump stations at these two reservoir sites (Attachment #1) will include all civil, structural, mechanical, electrical, and finishing work necessary to complete the installation and commissioning of two permanent chemical disinfection boosting systems. The work includes, but is not limited to, procurement and installation of the disinfection boosting systems, chemical piping, chemical storage and containment systems, canopy structures, and all appurtenant improvements required for a fully operational system. The project also includes removal and relocation of existing equipment as required.
DISCUSSION/ANALYSIS:
The installation of a permanent disinfection boosting system at La Granada and Lang Ranch Reservoirs will ensure that water disinfection levels can be maintained in these reservoirs, providing a high level of water quality for the City’s residents and businesses. The City owns two portable disinfection boosting trailers, which have been used consistently at the La Granada and Lang Ranch Reservoirs.
Installing permanent boosting systems at these two sites will allow the existing trailer units to be moved to other reservoir locations within the distribution system. The proposed improvements will also help increase resiliency of the City’s water service during wildfire events and other emergencies.
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.
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The estimated costs are as follows:
PROJECT ESTIMATED CONSTRUCTION COST
La Granada Pump Station (CI 5771) $ 895,300
Construction Contingency $ 89,500 Engineering Support Services During Construction $ 30,000 City Furnished Materials/Supplies $ 5,000
Total Estimated Construction Cost (CI 5771) $ 1,019,800 Lang Ranch Pump Station (CI 5791) $ 816,700
Construction Contingency $ 81,600 Engineering Support Services During Construction $ 30,000 City Furnished Materials/Supplies $ 5,000
Total Estimated Construction Cost (CI 5791) $ 933,300 Total Estimated Construction Cost (both projects) $ 1,953,100 Staff are requesting City Council authorization to advertise the project for bids.
Once bids are received, staff will make a recommendation at a future City Council meeting for the award of the construction contract. Additional appropriation at the time of construction award may be required depending on the actual bids received.
The preliminary project schedule is as follows:
PROJECT PRELIMINARY SCHEDULE
Advertise for Bids April 2026
Bid Opening May 2026
Award Construction Contract July 2026
Construction August-December 2026
Community Outreach: A public outreach plan has been established, with a focus on residents located adjacent to the project as well as the general public. Project website updates will be utilized to inform the public and receive feedback. Additionally, before the start of the construction, construction notices will be mailed to all property owners in the project area and intermediate special notices will be delivered to individual properties impacted by specific issues.
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This project meets City Council’s Top Ten Priorities #9, “Public Works Infrastructure Investments.”
CIP PROJECT PRIORITY (as outlined in FY 2025-26 and FY 2026-27 CIP Program Budget)
Priority One – Essential projects which address health and safety, legal, and regulatory requirements, as well as City Council’s Top Priorities projects.
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: Mario Mazed, Engineering Assistant
Attachments:
Attachment #1 – Vicinity and Location Maps
DPW: 850-20\ev\Council\2026\041426\ CI 5771 CI 5791\Permanent Disinfection Boosting Stations staff report.docx