# Oregon Buys #S-C01010-00018145

Aeration basin, diffuser, and SCADA improvements at Tri-City Water Resource Recovery Facility

**Posted:** October 07, 2026
**Respond By:** November 10, 2026
**Identifier:** S-C01010-00018145
**NAICS:** 237110, 238220, 238210, 238190

Clackamas County Water Environment Services is seeking a contractor to refurbish four aeration basins at the Tri-City Water Resource Recovery Facility in Oregon City.
- **Buyer:** Clackamas County, Water Environment Services, Procurement Division.
- **Project scope:** Refurbish four conventional activated-sludge aeration basins and related systems, with work phased to maintain facility operations. The engineer’s estimate is **$3.7 million**.
- **Major equipment and quantities:** Replace **16 zonal air-flow control assemblies**; install **3,315 SSII-9 EPDM diffuser membranes** across Basins 1, 3, and 4; furnish and install **1 PLC panel** and **3 Remote I/O panels**; install **40 stainless-steel weir-slot cover plates**; and provide **4 V706 filtered pressure regulator assemblies**. **Four access hatches** are an additive bid alternate.
- **Other work:** Basin cleaning and repairs; valve, gate, actuator, and seal work; air and sludge piping modifications; flow meters and instrumentation; electrical, communications, and SCADA improvements; structural work; demolition of **2 polymer storage tanks** and salvage of their mixers; and testing of hatch installations.
- **OEMs and vendors:** No equipment manufacturer or OEM is identified by company name. **SSII-9** is the specified diffuser-membrane designation, with approved equals allowed where specified. **Bid Locker** is named as the electronic bid-submission platform; no equipment vendor is named.
- **Notable requirements:** Prevailing-wage requirements and documented good-faith outreach to underrepresented subcontractors apply. Membrane installations require leak testing; liquid-containment hatch installations require liquid-tightness testing. The contractor must verify existing field conditions and coordinate work around facility operations.
- **Schedule:** Work is planned across summer shutdown seasons, with substantial completion within **700 days after Notice to Proceed** and final completion within **30 days after substantial completion**. No option years or annual subscription are stated.

### Description

Clackamas County, on behalf of Water Environment Services, is soliciting sealed bids for improvements to the Tri-City Water Resource Recovery Facility aeration basins. The work is a public improvement contract; bids must be submitted electronically through Bid Locker by November 10, 2026, at 2:00 PM Pacific Time. A mandatory pre-bid conference is scheduled for October 21, 2026, at 1:00 PM at the Tri-City WRRF Administration Building in Oregon City. The engineer’s estimate is $3,700,000, and prevailing wage requirements apply.

[View original listing](https://oregonbuys.gov/bso/external/bidDetail.sda?docId=S-C01010-00018145&external=true&parentUrl=close)