East King County Projects
This work is part of a program to restore corroded sewer lines throughout the regional wastewater system. Pipe lining is a cost-effective way of maintaining the sewer lines. It saves on materials and energy use, when compared to installing new sewer lines.
This is part of the conveyance system program created to rehabilitate corroded conveyance pipelines throughout the county’s wastewater system.
King County is beginning design on a project to upgrade 21,000 feet of aging pipeline in Redmond that has been in service for as long as 60 years. The new pipeline will increase system reliability and accommodate population growth.
Currently, flows from the North Lake Sammamish basin are routed to the South Treatment Plant through the East Side Interceptor (ESI). This project will divert up to 43 million gallons per day of wastewater from the North Lake Sammamish basin and send these flows to the Brightwater Treatment Plant. This project is necessary to maintain the ability of the ESI to convey peak flows during a 20-year storm event. The ESI is expected to reach peak flow capacity in 2021. Construction is scheduled to begin in 2017.
King County will continue project planning and design to replace sewer pipelines that have served neighborhoods in North Mercer Island, southwest Bellevue and the town of Beaux Arts Village since 1970. The new pipeline is being designed to serve these communities for the next 60 years
King County plans to upgrade two pump stations in Bellevue as well as connecting sewer pipelines. The project also entails upgrading the Eastgate Trunk structure near I-90, which enables wastewater from these pump stations to get to King County’s South Treatment Plant in Renton.