Outer wall of Murray CSO storage tank now complete; Tank construction is next
information from King County
Crews finished installing the outer wall of the Murray Combined Sewer Overflow (CSO) Control Project storage tank on Wednesday, August 13. The 80-foot deep underground wall is made out of four-foot wide concrete cylinders called secant piles. The secant piles interlock to form a watertight ring that will house the storage tank. Crews began installing the secant piles in late May. The secant pile drill and crane will leave the site by August 22. King County and its contractor know that installing the outer wall was loud and disruptive. Thank you for your patience during this work.
The County contractor will spend the rest of August preparing to dig out the area within the outer wall where the tank will be built. Pumps will be installed to control groundwater inside the ring and excess concrete will be removed from the work area. Platforms for the digging equipment will also be built.