Densified Activated Sludge Demonstration, District Project 100104

The Central Contra Costa Sanitary District is seeking pre-qualified general contractors for District Project 100104, the Densified Activated Sludge (DAS) Demonstration. Located in Martinez, California, the project involves installing a full-scale DAS process in Aeration Basin Tank 2, integrated with an existing MABR demonstration. The scope includes the procurement, construction, commissioning, and startup of a hydrocyclone-based physical selection system, a compressed air channel mixing system, RAS piping modifications, and temporary bypass pumping and power infrastructure. The contractor is also responsible for providing 24-hour pump watch staffing for six months and decommissioning specific components upon completion. This initiative is driven by the Third Bay Area Nutrient Watershed Permit, aiming for a 40-percent reduction in seasonal average total inorganic nitrogen by October 2034 by improving sludge settleability and increasing treatment capacity. The estimated construction cost for the project is 10 million dollars. To be eligible for the final bidders list, applicants must hold a valid California Class A General Engineering Contractor's License and pass a strict pre-qualification evaluation. Mandatory requirements include compliance with indemnification, insurance, and bonding standards, as well as adherence to the Build America, Buy America Act due to the use of federal grants. Performance and payment bonds of at least 100 percent of the bid amount will be required. Pre-qualification submissions must be uploaded to PlanetBids by 4:00 p.m. PST on October 5, 2026.