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About the Lake Hills Sewer Relining Project

Get information about the Lake Hills Sewer Relining project's schedule and construction benefits. 

The Lake Hills Sewer Relining Project is part of King County Wastewater Treatment Division’s Pipeline Corrosion Rehabilitation Program.

Why is King County rehabilitating the Lake Hills sewer pipe?

The Lake Hills Interceptor is a sewer pipe that collects and carries wastewater from homes and businesses in Bellevue to the South Treatment Plant in Renton for treatment.

Now over 50 years old, the Lake Hills sewer pipe is experiencing corrosion, and needs to be relined so it does not fail, overflow, or disrupt service. To protect the community and the environment, King County is planning to rehabilitate a 7,200-foot-long section of the pipe. This project will extend the useful life of this pipeline for another 50 years.

We have selected to rehabilitate instead of replace this sewer pipe because it is less expensive and has fewer surface construction impacts when compared to building new replacement pipes.

What are the benefits?

  • Extend the useful life of the pipe for another 50 years
  • Maintain reliable service for our customers
  • Improve water quality in our region 

Learn more below about how we extend the life of our pipes by lining them:

 

Courtesy of Sekisui

What temporary impacts can you expect during construction?

Construction impacts will likely include lane closures, detours, and equipment staging along the project area. Additional impacts may include noise and odors from the diversion pumps. This project may include overnight work. We will share more details as plans develop and will keep the community informed.

 

Phase schedule

  • 2021: 

    During predesign, we will:

    • Decide what methods we will use to reline the pipe
    • Determine the location of the temporary pipe, which will carry wastewater during the relining project
    • Identify impacts on the surrounding community

  • Spring 2022 – Spring 2023: 

    This year, we will begin designing the project. During this phase, we will:

    • Design the temporary pipe
    • Determine what permits are needed
    • Communicate plans with impacted neighbors and the surrounding community

  • Spring – Fall 2023:

    We will begin project construction in the dry season (May-October) of 2023. During construction, we will:

    • Prepare the site for construction
    • Install the temporary pipe
    • Line the pipe in place
    • Restore and clean up from construction
    • Provide updates to impacted neighbors and the surrounding community
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