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City of Bellevue, WA Utilities
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South Ridge Pump Station Improvements

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    Utilities Capital Projects

    • CIP Proposed Plan
    • Factoria Boulevard Stormwater Conveyance
    • Horizon View 2 Reservoir and Pump Station Project
    • Kelsey Creek/Lake Hills Culvert Project
    • Lake Hills Connector Fish Passage Improvements
    • Lakemont Blvd Culvert
    • Meydenbauer South Reservoir
    • Newport Sewer Basin Capacity Improvements
    • Pikes Peak Reservoir Replacement
    • Sewer Capital Investment Projects
    • Somerset Highlands Fire Flow Improvements
    • Somerset Reservoir Decommissioning Project
    • South Ridge Pump Station Improvements
    • Stormwater Capital Investment Projects
    • Valley Creek Culvert Replacement and Stream Restoration Project
    • Water Capital Investment Projects
    • Watershed Management Plan

    The City of Bellevue’s Capital Improvement Program includes projects to maintain reliable sanitary sewer conveyance. As part of this program, the City must replace old, worn pumps and the associated undersized force main discharge line for the South Ridge Pump Station. 

    Why is this project needed? 

    The existing South Ridge Pump Station was constructed in the early 1990s by a developer prior to annexation of the area into the City of Bellevue. The originally selected pump style is inadequate for this location and requires frequent replacement. The City determined that the best course of action to provide cost-effective,  reliable sewer service is to replace the pumps with a more robust, modern design. As a result of replacing the pumps, the associated force main discharge line needs to be upsized from an inadequate 2.8-inch diameter line to a 4-inch diameter line. Currently, the force main runs through steep, forested hillsides, and backyards. The new force main will be relocated to be fully within the public right-of-way to avoid disturbing private property,    and a portion will be installed by horizontal directional drilling on SE 64th Street to minimize construction impacts.

    Where is the project located? 

    The South Ridge Pump station is located on 108th Avenue SE. The force main replacement work will occur on 108th Avenue SE, going south from the station, then turning east and going along SE 64th Street. 

    South Ridge New Sewer Line

    Description of Construction – Force Main

    The new force main will be installed along the west side of 108th Avenue SE, leaving the east side open for one lane of traffic during construction. . The pipe will also be installed by horizontal directional drilling (HDD) under the forested hillside on the western end of SE 64th Street. A drill rig will be placed at the bottom of the hill and will drill to the east. The HDD section of pipe will be fused together and staged along the north side of SE 64th Street, then pulled back through the excavation to complete the pipe installation. Temporary grading will be required at the drill area, which will be restored to existing conditions following construction.   Disturbed pavement will be patched on 108th Avenue and SE 64th Street after construction, and is scheduled to be fully repaved by the City in 2026. The force main replacement is anticipated to occur before the pump station improvements and will take about two months to complete. 

    Description of Construction – Pump Station

    To complete the pump station improvements, bypass pumping will be required. This will require the use of temporary diesel pumps. The existing pumps and some electrical equipment will removed, and then replaced with new equipment. . It is anticipated that this portion of construction will take about one to two months to complete. 

    Project Timeline 

    • 2022 - Alternatives Analysis
    • 2023 to mid-2024 - Design and Permitting 
    • Summer 2024 - Bid
    • Fall 2024 to Late 2025 - Construction

    Construction may be delayed a few months if equipment is not acquired in time as anticipated. 

    Community Engagement 

    The City will engage with residents who may be impacted by this project as construction commences. We want to understand and support the needs of the community to the extent possible, and we are committed to working through construction with residents, to minimize impacts.

    Potential Impacts

    During construction, traffic on 108th Avenue SE and SE 64th Street will be impacted. Traffic restrictions will be in place during construction activities. Potential impacts may include temporarily blocked driveways during work days, and one-way alternating traffic. Flaggers and traffic control measures will be onsite to minimize traffic delays and create a safe work zone.

    Services including garbage, mail, and emergency vehicles will not be impacted. The project team and the construction inspector will be in contact with residents during construction to communicate potential impacts. Residents are also encouraged to contact the construction inspector with any concerns about the project.

     

    Southridge

    Contact

    James Stockwell, P.E.
    Project Manager
    Telephone
    425-452-4868
    Email
    jstockwell@bellevuewa.gov
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    Reasonable Accommodation

    For alternate formats, interpreters, or reasonable modification requests please phone at least 48 hours in advance 425-452-6800 (voice) or email servicefirst@bellevuewa.gov. For complaints regarding modifications, contact the City of Bellevue ADA, Title VI, and Equal Opportunity Officer at ADATitleVI@bellevuewa.gov.

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