BID 2026-78 Tri-City Water Resource Recovery Facility (WRRF) Aeration Basin Improvements

The County of Clackamas is seeking a qualified contractor to refurbish and upgrade the four aeration basins at the Tri‑City Wastewater Treatment Plant. The work includes demolition of existing structures, concrete repair, installation of new low‑ and high‑pressure air piping, replacement of flow‑control valves, actuator systems, upgraded PLC‑based SCADA control panels, dissolved‑oxygen instrumentation, and associated electrical work. The contract is a competitive sealed‑bid, open‑market procurement with a $3.7 M engineer’s estimate and must be completed in two phased summer shutdowns, with substantial‑completion milestones in September 2027 and September 2028. The project requires compliance with Oregon prevailing‑wage statutes, extensive bonding and insurance, and a mandatory pre‑bid conference. • Demolition, concrete repairs, and structural upgrades for four aeration basins (≈640 k gal each). • Mechanical upgrades: new ALP/AHP piping, diffusers, pneumatic‑actuated flow‑control valves, and related actuators. • Electrical/Instrumentation: new PLC, Remote I/O, transformers, panels, wiring, SCADA cabling, DO probes, and flow meters. • Mandatory pre‑bid conference (Oct 21 2026) and strict adherence to schedule, safety, and prevailing‑wage requirements.