South Treatment Plant Dissolved Air Flotation Thickener Tanks Rehabilitation

King County Department of Natural Resources and Parks Wastewater Treatment Division is requesting bids on rehabilitation of six dissolved air flotation thickener tanks at the South Treatment Plant in Renton, Washington, under Contract KC001675, with bids due July 30, 2026 at 1:30:59 p.m., a pre-bid conference on July 14, 2026 at 10:00 a.m., and physical site tours on July 15, 2026. The project is subject to Davis-Bacon prevailing wage requirements, Build America Buy America provisions, American Iron and Steel requirements, and a 15% minimum apprentice utilization requirement with Priority Hire labor-hour targets of 27% apprentice and 18% journey-level positions. MBE and WBE participation goals are 10% and 6%, respectively (voluntary).

The scope includes modification and replacement of six DAFT mechanisms, piping, appurtenances, cover systems, access hatches, and associated electrical equipment; modification of existing concrete tank walls for four DAFTs; and associated electrical work. Subcontracting opportunities are identified in truck driving, concrete masonry, painting, electrician demo, electrician startup and commissioning, and programming. Site tours are limited to 15 attendees per session (8:00 a.m. or 9:30 a.m. start times) and must be reserved by email with the Contract Specialist.

The Engineer's Estimate is $29.958 million. Bid guaranty must equal at least 5% of the total bid price. A Performance and Payment Bond of 100% of contract price is required upon award. The contract is funded in part by the U.S. Environmental Protection Agency through the Water Infrastructure Finance and Innovation Act (WIFIA). Bidders must acknowledge all addenda, submit suspension and debarment certifications, provide Build America Buy America and American Iron and Steel certifications, and demonstrate organizational conflict of interest compliance prior to bid submission. Questions are due prior to the pre-bid conference.