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Council approves exterior corrosion‑protection design for Hoffman Hill reservoir
Summary
Council approved Resolution 26‑004 to authorize design services for exterior coating of the Hoffman Hill reservoir; staff said the work will require emptying the tank and is scheduled for winter 2026–27, with technical measures and inspections planned to manage condensation and curing.
The DuPont City Council approved Resolution 26‑004 authorizing design services for exterior corrosion protection of the Hoffman Hill Reservoir after a staff presentation and brief council Q&A.
Mr. Lim presented the project scope and timeline. He described the reservoir as roughly 30 feet tall and about 180 feet in diameter, and said the exterior coating must be applied in winter months to avoid condensation that would prevent proper adhesion. Lim said the prior interior corrosion protection phase cost about $900,000; the planned exterior work will require emptying the reservoir and is tentatively scheduled for November 2026 through March 2027, with design complete by August and construction procurement in September. Lim said the city will use temporary canopies and localized heating during application and follow up with x‑ray inspection to detect defects.
Councilmembers asked about system impacts and cure times. Lim said winter water demand averages about 20,000,000 gallons per month (about 650,000 gallons per day) and that the city’s 1,000,000‑gallon Bell Hill reservoir should satisfy demand during the winter months while Hoffman Hill is emptied. He noted that summer peak demand is substantially higher. Councilmembers also asked whether coatings and low temperatures would delay work; Lim said the team anticipates heater/canopy arrangements and that work will proceed panel by panel with cure times of days per panel.
Councilmember Beryl moved to approve Resolution 26‑004; Councilmember Elliot seconded. The council voted in favor with no recorded opposition.
Why it matters: The reservoir project is infrastructure maintenance intended to extend the life of critical storage; emptying the tank and scheduling work in winter affects operational storage planning and may require coordination with the water system operator.
Next steps: City staff will proceed with final design, request bids in late 2026 and return with contract actions as required by city procurement procedures.
