2025 AC Water Main Replacement

The City of Mercer Island, Washington is requesting sealed bids for the 2025 AC Water Main Replacement project (Bid 2026-AFB-030), with bids due September 17, 2026 at 2:00 p.m. and a mandatory pre-bid meeting on September 2, 2026. The project is subject to RCW 39.04.320, requiring that 15% of all labor hours be performed by apprentices registered in a State Approved Apprenticeship Program, with incentives available for exceeding the requirement and penalties assessed for non-compliance without approved Good Faith Effort.

The scope encompasses replacement of approximately 5,700 linear feet of asbestos cement water main with ductile iron water main; appurtenances ranging from 6 to 8 inches in diameter; 11 fire hydrant assemblies; 90 water service connections; 8 connections to existing water mains; and concrete driveway and HMA road restorations, together with temporary erosion and water pollution control and property restoration.

The engineer's estimated cost is $4,425,000. All bidders must be licensed Washington contractors with current Unified Business Identifier numbers, workers' compensation coverage, and must not have been disqualified under prevailing wage statutes. Bidders must comply with Washington State prevailing wage requirements for King County as of September 17, 2026 and submit a 5% bid deposit. Successful bidders must execute a Public Works Contract within ten calendar days of award and provide performance and payment bonds.

The City encourages participation of certified disadvantaged business enterprises and women business enterprises as both prime contractors and subcontractors. Final completion must be achieved within 185 working days from Notice to Proceed, with substantial completion five calendar days prior. Contract award is anticipated after the City Council meeting on October 6, 2026, with Notice to Proceed anticipated the week of October 26, 2026. Questions are due September 11, 2026 at 12:00 p.m., with responses posted by September 15, 2026 at 4:00 p.m. No construction work shall occur on City holidays or during Mercer Island's July 2027 Summer Celebration.