Densified Activated Sludge Demonstration

The Central Contra Costa Sanitary District is seeking qualified general contractors to install owner‑furnished hydrocyclone and compressed‑air mixing equipment, modify return activated‑sludge piping, and construct, rent, then de‑commission temporary bypass pumping, piping, and power infrastructure for a Densified Activated Sludge (DAS) demonstration. The contract is estimated at $6.25 M with a 365‑day performance period and requires compliance with California prevailing‑wage rules, Class A contractor licensing, DIR registration, and CARB vehicle standards. Bids must include a 10 % bid bond and be submitted in sealed envelopes by 2 p.m. on November 12, 2026. Only pre‑qualified general contractors listed in the bid documents may bid.