DATE: June 14, 2016
TO: Mayor and City Council
FROM: Director of Utilities & Environmental Services
SUBJECT
Title
Water Pollution Control Facility (WPCF) Headworks Rehabilitation Project: Approval of Addendum No. 1, Award of Construction Contract, and Appropriation of Funds.
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RECOMMENDATION
Recommendation
That Council adopts the attached resolutions:
1. Approving Addendum No. 1, which provides minor revisions to the Plans and Specifications
2. Awarding the contract to TNT Industrial Contractors, Inc., in the amount of $1,722,248, and
3. Appropriating additional funds in the amount of $1,422,248 in FY 2016.
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BACKGROUND
The City's WPCF provides treatment for wastewater collected from the City's residential and business communities. The facility treats an annual average flow of twelve million gallons per day (MGD) and meets current requirements to discharge treated effluent to the deep waters of the San Francisco Bay. All of the flow coming to the WPCF passes through the headworks and is conveyed through influent channels with grinders designed to break down large debris prior to pumping to downstream treatment processes. The Headworks Building was originally constructed in 1996 and is an essential facility at the WPCF.
A recent structural inspection revealed substantial deterioration of the concrete on the interior deck of the influent channels inside the Headworks Building caused by exposure to hydrogen sulfide, a corrosive gas and a common byproduct of sewer collection and conveyance. The protective coatings originally installed in the headworks had deteriorated over the years and in some areas had completely failed leading to substantial corrosion including loss of the cement covering the reinforcing steel in some areas. The Headworks Rehabilitation Project is intended to repair concrete areas that have deteriorated, as well as provide for new concrete coatings and improv...
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