TO: LINDA REICH, CITY MANAGER
FROM: HYE JIN LEE, PE, DIRECTOR OF PUBLIC WORKS
SUBJECT
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Professional Services Agreement Amendment No. 1 - Benson Reservoir No. 3 Improvement Project (WA213)
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RECOMMENDATION
Approve Amendment No. 1 for $162,473 to the Professional Services Agreement with Dudek (Agreement No. 2024-282), for additional services to design a structural concrete tank for Benson Reservoir No. 3 Improvement Project (WA213); and authorize the City Manager to execute all necessary documents on behalf of the City.
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FISCAL IMPACT
Sufficient funds are budgeted for the Fiscal Year 2024-2025 Capital Improvement Program (CIP) for the Benson Reservoir No. 3 Improvement Project (WA213).
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Benson Reservoir No.3 Improvement Project (WA213) |
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Fund |
Adopted Budget |
Expenditures/ Encumbrances |
Available Budget |
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520 - Water Fund |
$4,509,440.00 |
($729,685.01) |
$3,779,754.99 |
CITY OF CHINO MISSION / VISION / VALUES / STRATEGIC ISSUES
The recommendation detailed above furthers the City’s values and strategic issues that serve as key pillars on which identified priorities, goals, and action plans are built, by fostering:
• Financial Stability
• Responsible Long-Range Planning
• Effective Technology
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Revenue: Click or tap here to enter text. |
Expenditure: 5207310 - 48004 - WA213 |
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Transfer In: Click or tap here to enter text. |
Transfer Out: Click or tap here to enter text. |
BACKGROUND
The Benson Water Treatment Plant (Benson WTP) centrally treats groundwater supplied from Well 5 and Well 9 located onsite, and Well 10 located offsite. The Benson WTP has the capacity to treat 3,400-gpm (gallons-per-minute) utilizing Granular Activated Carbon vessels to remove 1,2,3 TCP and a 5,000-gpm capacity to remove nitrate via a Calgon ISEP ion exchange. The Benson WTP supplies treated water to Reservoir No. 3 which supplies the Benson Booster Pump Station and boosts the flow into the water system.
The existing Benson Reservoir No. 3 was constructed in 1961 and does not meet current seismic requirements. The City plans to replace the existing 1.5-million-gallon (MG) capacity reservoir with a new 7-MG capacity reservoir on the northwest corner of the current site. The existing reservoir will be demolished following the installation of the new reservoir. This order of work allows for operations to be maintained at the Benson WTP during project construction.
On October 17, 2023, the City released a Request for Proposals (RFP#2023-7011) “Benson Reservoir 3 Improvement Project” and on November 14, 2023, the City received two proposals. On May 31, 2024, the City Council approved a professional services agreement with Dudek for design engineering and construction support for the Benson Reservoir 3 Improvement project for $694,851. The Request for Proposals (RFP) scope included replacing the existing reservoir with a new steel tank to the maximum size possible. As part of their scope of work, Dudek prepared a Preliminary Design Report (PDR), to identify and address deficiencies and comply with all current applicable codes and standards for design development. The proposed design confirms that the site can accommodate a 172-foot diameter tank with a capacity of 7.4 MG. To meet current seismic code requirements, the tank’s internal clearance height is set at 10 feet 8 inches, resulting in an overall height increase of approximately 10 feet compared to the existing tank.
ISSUES/ANALYSIS
As part of the Project’s PDR, Dudek evaluated alternative tank material solutions and now recommends modifications to better align with the City’s long-term sustainability and fiscal responsibility goals. Dudek included the potential advantages of a concrete reservoir for the City’s consideration. While the upfront construction cost of a concrete tank is approximately 40% higher than that of a steel tank, concrete structures offer reduced long-term maintenance needs. In contrast, steel reservoirs require regular recoating, and inconsistent maintenance can lead to significant structural deterioration and costly repairs over time. To memorialize the selection of the most cost-effective and sustainable option, the design team will conduct a comprehensive life cycle analysis comparing steel and concrete alternatives. The life cycle analysis will provide the more cost-effective and sustainable option to be concrete, however it must be memorialized in this way within the PDR to move forward. Based on this revised scope, staff recommend amending the design contract to incorporate this analysis and address long-term maintenance considerations.
Therefore, staff recommends the City Council approve Amendment No. 1 to the professional services agreement (2024-282) with Dudek for $162,473 to complete additional design services for a structural concrete tank for the Benson Reservoir No. 3 Improvement Project for a total contract amount not to exceed $857,324.
Attachments: Exhibit A - Project Vicinity Map
Exhibit B - PSA Amendment No. 1 - Dudek (WA213)