Densified Activated Sludge Demonstration

The Central Contra Costa Sanitary District is seeking sealed‑paper bids from pre‑qualified general contractors to install owner‑furnished hydrocyclone and compressed‑air mixing equipment, modify return activated‑sludge piping, and provide temporary bypass pumping, piping, and power infrastructure for a wastewater‑treatment plant demonstration. The project is budgeted at $6.25 M and includes demolition, concrete repairs, civil/structural work, mechanical installation, electrical distribution, and instrumentation integration, with a 365‑day performance period. • Scope covers hydrocyclone installation, RAS pipe modifications, and temporary bypass system (pump, pipe, power). • Requires California Class A contractor license, prevailing‑wage compliance, 10 % bid bond, and post‑award performance & payment bonds of 100 % of the bid. • Only seven pre‑qualified contractors may submit; bids due Nov 12, 2026, 2 p.m., with a pre‑bid meeting (optional) on Oct 27, 2026.