Murray CSO control project -- Building a new storage tank to protect Puget Sound
September 17, 2014 Project Update -- Storage tank excavation begins Thursday, September 18
Now that the contractor has completed secant pile installation, crews will begin digging to clear space for the underground storage tank on September 18, 2014. Excavation will be complete by early 2015. Crews will dig out an area about 80 feet deep and 100 feet wide. All of the material removed will be trucked off site. These activities will bring as many as 55 trucks per day to the project site to load and haul off material. Trucks will access the project site from 48th Avenue S.W. or Lincoln Park Way S.W. Please be aware of traffic as trucks move in and out of the site. View Project Update (PDF, September 17, 2014)
View haul route (PDF).
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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 (external link), 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.
View construction schedule overview (PDF) and project meeting calendar.
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