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Kennewick staff recommend blended enclosure for PFAS treatment at Rainy Collector 5 after consultants warn of regulatory deadline and multimillion-dollar costs
Summary
City staff and consultants briefed council on required PFOS treatment at Rainy Collector 5, describing monitoring results above the new EPA maximum contaminant level, a $33 million preliminary project budget, a $15 million DWSRF award, and three enclosure options with differing cost and aesthetic trade-offs.
Utility staff told the Kennewick City Council the city must build treatment for per- and polyfluoroalkyl substances (PFAS) at Rainy Collector 5 (RC 5) to meet new federal drinking-water standards and that the project will require major capital investment and decisions about the treatment structure and appearance.
Caleb Shannon, Utility Services Manager, summarized the regulatory timeline and monitoring: "In April 2024, the EPA released the maximum contaminant levels, the MCLs, for several per and poly [fluoroalkyl] substances" and Rainy Collector 5 routinely exceeds the new PFOS MCL of 4 parts per trillion, with values the presentation showed generally between 8 and 15 parts per trillion and as high as 18 parts per trillion on some tests.
Staff said the city received a notice of $15,000,000 in DWSRF funding after applying in late 2024 and selected Hazen and Sawyer to design the PFAS treatment project in March 2025.…
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