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Project description

The Eastside Interceptor (ESI) is a regional sewer line that carries wastewater from eastside homes and businesses to King County’s South Treatment Plant in Renton.

The ESI was originally constructed in the 1960s. Over time there has been significant deterioration of the concrete pipe which needs to be repaired. The ESI project will improve 3,900 feet of corroded concrete pipe. A new lining will be applied inside the existing pipe, extending the working life of the pipe.

The project area follows Logan Ave. North, from around the intersection of Garden Ave. on the north end, to near North 6th Street between Logan and Burnett Ave. North at the south end of the project.

Work is scheduled to begin in spring 2019 and is expected to take 6 to 8 months to complete.

  • The sewer pipe needs to be dry during the lining process, so temporary bypass pipes will be used to carry wastewater around the work. The bypass pipes will be installed in trenches and at grade along the road shoulder and in bike lanes along Logan Avenue North.
  • Pumps and generators at the north end of the project will push wastewater through the bypass pipes.
  • Once wastewater flows have been rerouted around the work area, workers can enter the pipe. When work is completed, the bypass pipes and pumps will be removed and work areas restored.

What does the project include?

King County will be using the Linabond lining system to rehabilitate the pipe. This is a fast-curing PVC liner that is glued to the inside wall of the existing pipe.

Workers will access the pipe through manholes. Two trucks with supplies will be placed near each manhole entrance (see map below). There will also be odor control and ventilation equipment at these locations.

What you can expect during construction:

  • The project needs to be completed during one dry season. To accomplish this, there will be double shifts and some weekend work.
  • Noise from construction equipment, ventilation, and bypass pumps.
  • Lights from construction work done in the evenings and for overnight work.
  • Odors from construction equipment, back-up generators, the materials used to line the pipe, and possibly localized sewer odors.
  • Some of the bike lane on Logan Ave. and some sidewalk sections will be closed during the work.
  • Temporary traffic lane closures and possible traffic delays. A minimum of one travel lane in each direction will be maintained along Logan Ave. during the work.
  • Bus stops on Logan Avenue North and North Tenth Street may need to be temporarily relocated.

conceptual layout of Eastside Interceptor Section 2Eastside Interceptor Section 2, conceptual layout (July 2018)

Design phase

For information about the project

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For questions about the project, contact David Freed at: or at 206-263-9453