Renovation of a water / sewer project in Mercer Island, Washington. Working plans call for the renovation of a water / sewer project.

As of September 19, 2025, design is 90% complete. The owner expects to release the construction package for bid in late-November 2025. Construction is tentatively scheduled for June of 2026. *Previous solicitation listed below for reference:* Project Description The purpose of this project is to provide engineering design services for the rehabilitation of sewer pump station 20, located at 8790 85th Ave SE. The complete design shall be based on the recommendations from the assessment report conducted by RH2 Engineering, attached to this RFQ as Exhibit 2. The pump station cannot be taken offline; therefore, improvements impacting the existing flows at the station will require a temporary sewer bypass. Project design shall include site specific bypass plans indicating all required components, pump suction and discharge locations, configuration and routing of piping, existing sewer flow information, and any property owner impact mitigation requirements. the City of Mercer Island (City) is announcing this Request for Qualifications (RFQ) to solicit Statement of Qualifications (SOQ) from qualified engineering consultants to provide professional Design Services for Sewer Pump Station 20 Rehabilitation. Work includes determining the appropriate rehabilitation methods based off the City's most recent pump station assessment report, designing plans, developing bid documents, and providing construction support services. Additional work involves preparing template technical specifications and standard details that can be implemented on future projects. All questions on the project are due by March 22, 2024, at 12 noon (PST). Questions regarding the project may be emailed to Christopher Marks, Utilities Engineer, at chris.marks@mercerisland.gov. Any oral communication will be considered unofficial and non-binding. Questions via phone will not be accepted. All questions received will be compiled, and responses will be posted by March 25, 2024, at 2 pm (PST). Target completion January 2025 Rights reserved by the City: The City reserves the right to reject any or all responses received for this solicitation; extend the submission due date; modify, amend, reissue, or rewrite this solicitation; and procure any or all services by other means. The city reserves the right to modify the scope of this solicitation. BACKGROUND Construction of Mercer Island's sewer system occurred in the 1950s and 1960s and consists of approximately 2,400 manholes, 105 miles of pipe, and 18 pump stations (17 pump stations and 1 flush station). Pump stations are located close to the shoreline (generally within 50 feet) and are only used to convey flow through the lake line to King County's South Treatment plant. The pump stations are constructed of concrete and are similar in design with most being a wet pit/dry pit configuration, however two are submersible. There have not been substantial upgrades to the pump stations except for pump station 4 (built in 2010), pump station 14 (rebuilt in 2014), and pump station 11 (currently being rebuilt by King County).