Biogas And Biosolids Evaluation: Digester 1 Cleaning

The City of San Mateo is soliciting bids for project 46t090, which involves the cleaning and interior surface preparation of Digester 1 at the local Wastewater Treatment Plant. The scope of work includes the removal and offsite disposal of approximately 30,000 gallons of digester contents, high-pressure power washing, and the abrasive blast cleaning of 25,000 square feet of interior surfaces. The contractor is also responsible for the design, installation, and monthly rental of interior scaffolding, which must remain in place for subsequent repair and coating work performed under a separate contract. An optional bid item is available for the screening and transfer of contents from Digester 1 to Digester 2 to reduce disposal volumes. The estimated base construction cost is 1,100,000 dollars, with a completion timeframe of 130 working days. Bids are due by October 14, 2026, and will be awarded to the lowest responsive and responsible bidder. Applicants must provide a bid security equal to 10 percent of the maximum bid amount and, upon award, provide performance and payment bonds for 100 percent of the contract price. The project is subject to strict safety and environmental regulations, including Cal/OSHA permit-required confined space standards, NFPA 820, and EPA regulations for biosolids handling. Additionally, the contractor must comply with California Air Resources Board regulations for off-road diesel-fueled fleets. Work is restricted to Monday through Friday, from 7:00 a.m. to 5:00 p.m. All project management, correspondence, and submittals will be handled through the ProCore electronic portal.