RFP Heavy Civil GC/CM Services for STP Treatment and Electrical Improvements (TEI)

King County Department of Natural Resources and Parks, Wastewater Treatment Division is requesting proposals for Heavy Civil GC/CM preconstruction and construction services for the South Treatment Plant Treatment and Electrical Improvements Project in Renton, Washington, with proposals due October 13, 2026 at 1:30 p.m. and required site tours on August 31 and September 1. The procurement carries mandatory self-perform work (30–50% of total construction cost), a minimum 20% utilization requirement for King County-certified Small Contractors and Suppliers, and mandatory apprentice utilization of at least 18% of total construction labor hours under the Master Community Workforce Agreement with Priority Hire requirements.

The scope encompasses preconstruction and construction services for upgrades to preliminary treatment, secondary treatment, odor control systems, and electrical systems at a facility processing approximately 70 million gallons of wastewater daily. Early work packages include influent gates and actuators replacement, bar screen upgrades, return activated sludge piping replacement, secondary sedimentation tank retrofit, and chemical odor reduction tower improvements. The preconstruction services agreement is estimated at $6.4 million with a 33-month period of performance. The GC/CM construction services contract is estimated at $165 million (exclusive of sales tax and preconstruction services) with a 78-month period of performance, targeting substantial completion in January 2034. All capital projects must achieve a Platinum rating on the King County Sustainable Infrastructure Scorecard or equivalent system. Contractors must comply with King County's living wage ordinance and equal benefits requirements.

Evaluation criteria total 300 points: approach (40), experience and past performance (70), outreach and inclusion (15), capacity and location (15), interview (130), and final price proposal (30). The pre-proposal conference was held August 27, 2026. Finalists are expected to be notified the week of November 23, 2026, with finalist interviews on January 12, 2027, and Notice of Intent to Award anticipated the week of February 8, 2027. Voluntary participation goals include 5% for Public Works Small Business Enterprise firms and 2% for Veteran-Owned Business firms.