North digester cleaning project

The City of Sun Prairie, Wisconsin, has issued a Request for Proposals (RFP #19-WW04) for the North Digester Cleaning Project at its wastewater treatment plant. The procurement seeks a licensed contractor to comprehensively clean a 260,000-gallon anaerobic digester that has not been serviced since 2006, involving the removal of approximately 145,000 gallons of liquid sludge and 220 cubic yards of non-compostable materials. Key deliverables include pumping and hauling digested liquids and solids, land application of biosolids at Wisconsin Department of Natural Resources (WDNR)-approved sites, and transportation of unsuitable materials to licensed landfills. Contractors must provide all necessary equipment, including pumps, trucks, generators, ventilation systems, and confined space entry safety gear. The evaluation criteria will assess qualifications (20 points), experience and technical competence (25 points), proposed work method (15 points), biosolids disposal knowledge (15 points), project organization (15 points), and cost (10 points). The RFP was issued on July 12, 2019, with questions due by July 26, 2019, answers posted on July 30, 2019, and proposals due on August 30, 2019, at 2:00 PM CST. The contract term is 90 days from the Notice to Proceed date, ending November 22, 2019, with work to be completed within 60 days or incur a $300 per day penalty.

The solicitation does not specify explicit set-aside designations for disadvantaged enterprises, but does include a local vendor preference for suppliers with physical addresses within Sun Prairie city limits. Contractors must be licensed by WDNR for biosolids hauling and land application, demonstrating specific regulatory compliance requirements. Insurance requirements are comprehensive, including Worker's Compensation, $1,000,000 Commercial General Liability, $1,000,000 Automobile Liability, and $5,000,000 Umbrella Liability coverage. While no incumbent vendor is mentioned, the project involves existing municipal wastewater infrastructure at the treatment plant, with the city providing water at approximately 60 psi pressure and recent biosolids test results. The compensation structure includes a lump-sum cost for liquid removal and a unit price per cubic yard for landfill disposal, with payment to be made within 30 days of invoice receipt following project completion. The contract includes an option for one additional year under the same or more favorable terms, with pricing adjusted based on the Consumer Price Index for All Urban Consumers.