Slayden served as the CM/GC for the expansion of the Tri‑City Water Pollution Control Plant in Oregon City, delivering preconstruction, construction, and commissioning services for this major upgrade. The project combined both proven and innovative wastewater treatment technologies to achieve high performance within a compact footprint. Throughout preconstruction, our team led collaborative work sessions to review treatment goals, evaluate equipment options, improve operational layouts, and identify value engineering opportunities.

The completed expansion increased the plant’s average dry‑weather capacity from 8 to 12 MGD and boosted peak wet‑weather capacity from 60 to 70 MGD, with a modular design that allows the facility to grow to 40 MGD in the future. Improvements included a new pump station, fine screening equipment, aeration basin, submerged membrane basins, UV disinfection, odor control systems, and standby power. Close coordination with the District’s engineering, operations, and maintenance staff ensured the upgraded plant was both highly functional and well‑suited to long‑term community needs.

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