Secondary Sedimentation Basins Upgrades Project - Short-term Improvements for Basins (1) & (2)

West County Wastewater District is soliciting sealed bids for construction of the Secondary Sedimentation Basins 1 and 2 Short-Term Improvements Project at its Water Quality & Resource Recovery Plant in Contra Costa County, California. A mandatory pre-bid conference is November 10, 2026 at 10:00 a.m. at 2377 Garden Tract Road, Richmond, and bids are due December 16, 2026 at 3:00 p.m. through the district's OpenGov e-Procurement Portal. Contractors must hold a license under California Business and Professions Code Chapter 9, Division 3.

The work is limited to Secondary Sedimentation Basins 1 and 2 and includes demolition, concrete repairs, coatings, mechanical improvements, electrical upgrades, and site restoration, with all labor, materials, equipment, and supervision supplied by the contractor. West County Wastewater District is directly procuring and furnishing replacement collector chains and flights, and the contractor must receive, handle, store, protect, coordinate, and install that owner-furnished equipment at no cost increase to the contract. Black & Veatch provided the engineering design. The contract carries a one-year warranty on equipment, materials, products, and workmanship after final acceptance. Work is subject to California prevailing wage requirements.

The engineer's estimate is $5.625 million. Basin operation deadlines are firm: Secondary Sedimentation Basin No. 1 must be operational by May 15, 2027 (dry season), and Basin No. 2 by September 30, 2027 (wet season), with the facility maintaining at least two to three basins in service depending on season. Bids are evaluated on the lowest responsive, responsible bid. Each bid requires proposal security of 10 percent of the proposal total by certified check, cashier's check, or bidder's bond. The awardee must furnish performance and payment bonds for 100 percent of the proposal total. Subcontractors exceeding 0.5 percent of the proposal total or $5,000, whichever is greater, must be listed. Bids remain firm for 60 calendar days.

An alternate mandatory site visit is available November 12, 2026. Written questions are due November 26, 2026 at 3:00 p.m., with responses due December 8, 2026. Contract award is anticipated December 21, 2026, with Notice to Proceed on January 13, 2027.