Murray CSO control project -- Building a new storage tank to protect Puget Sound
September 13, 2016 project update - Restoration begins. Connection between sewer lines and underground storage tank nearing completion.
Roadway and sidewalk restoration
Restoration work will continue intermittently for the rest of the project. Flaggers will be present during any lane closures. Expect variable road conditions, including loose gravel, pavement cuts, uneven surfaces, and steel plates. Cyclists should use extreme caution when traveling near the project area.
Underground storage tank and sewer line connection
The County’s contractor is nearing completion of the connection between the underground storage tank, 5-foot-wide sewer line, and local sewer line. A temporary bypass system was used to maintain sewer service to the neighborhood when work on the connection pipe began in July. To complete the connection, the contractor will need to use the temporary system again.
Starting the week of September 12, a pump from the temporary system will run continuously for five days (day and night) to move flows around the work zone. Odors may be more noticeable while the pump is running. Air quality will be monitored to ensure safe conditions. A representative from the contractor will be on site at all times to monitor the pump.
More on this work and what to expect (PDF).
Please direct any questions or concerns to the project hotline: 206-205-9186. .
Murray Project Hotline: 206-205-9186
Final Design, December 2012
Project haul routes, February 2014
Murray basin and project location
King County is designing an underground storage tank across the street from Seattle’s Lowman Beach Park. The tank will store approximately one million gallons when the Murray Pump Station exceeds maximum capacity.
Why do we need this project?
Protect public health
Like many cities around the country, the older parts of King County's wastewater system uses a single set of pipes to carry untreated sewage and stormwater to a treatment plant. To prevent sewer backups into homes and streets, the system includes safety valves called “combined sewer overflows” that route excess sewage and polluted stormwater flow directly into Puget Sound during storms. Although CSOs reduce potential exposure to untreated sewage, they pose significant public health concerns.
Clean up Puget Sound
The Murray CSO control facility will reduce CSOs into Puget Sound. State regulations require no more than one untreated discharge per year. The Murray Pump Station averages five untreated CSO events per year, discharging 5 million gallons into Puget Sound off of Lowman Beach Park.
How has the community shaped facility design?
Since October 2011 Lowman Beach Park neighbors and park users have worked with local designers, environmentalists and community advocates to help the King County project team design a facility that fits with the community. These discussions produced “common themes” for the design that reflect the community’s values for a safe, reliable facility. The common themes are:
- Minimize the “industrial facility” feel
- Encourage views of Puget Sound
- Discourage through traffic on Beach Drive
- Enhance continuous space between Lowman Beach park and the facility site