King County, Washington, Completes Challenging Sewer Bypass and Rehab Near Boeing

Boein Facility

By Brian Sliger, Erik Waligorski, Matoya Darby & Bob Isaac


King County’s Eastside Interceptor (ESI) collects the majority of wastewater flows from the Puget Sound Area Cities of Kirkland, Bellevue, Mercer Island, Sammamish, Issaquah, Newcastle and Renton, and conveys it to the County’s South Treatment Plant. This aging reinforced concrete pipe (RCP) interceptor was constructed over 50 years ago and corrosion caused by hydrogen sulfide (H2S) gas has begun to take its toll on the pipe’s interior.

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