Murray CSO control project  Murray CSO basin project area site plan (PDF, 1.3MB) Source: Draft West Seattle CSO Control Facility Plan, December 2010 Project areaKing County plans to design and build a one million gallon underground storage tank on private property across from Lowman Beach Park along Beach Drive S.W. This facility will store peak flows when the Murray Pump Station exceeds capacity. The recommended proposal also involves an underground diversion structure located under the southeastern corner of Lowman Beach Park and an ancillary equipment facility (odor and electrical unit) above ground on the storage tank site. Project elementsThe recommended proposal includes the following elements. - Property acquisition
- An underground diversion structure located in Lowman Beach Park
- A pipe connecting the diversion structure to the storage tank to convey peak flows during a wet weather event
- An approximately 6,000 square foot underground storage tank across from Lowman Beach Park
- Access hatches on the tank site for operations and maintenance activities
- Retaining wall to protect the existing hillside along the northeast, east, and south edges of the storage tank site
- One story equipment facility including odor control and electrical facilities, located above the storage tank
- Landscape restoration in Lowman Beach Park and above ground at the storage tank site
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