South Magnolia CSO Control Project
Vicinity and Project Area (PDF).
Project area King County is designing and building an underground storage tank in the Port of Seattle’s Terminal 91 West Yard south of the Magnolia Bridge. This facility will store peak combined sewer flows conveyed from a diversion structure on 32nd Avenue West when the South Magnolia Trunk Line reaches maximum capacity. After storms have passed, stored flows will be transferred to the Interbay Pump Station for conveyance to the West Point Treatment Plant.
Project elementsThe underground diversion structure in the right-of-way under 32nd Ave West that will convey peak flows via a gravity sewer line to the underground storage tank in the Port of Seattle’s Terminal 91 West Yard south of the Magnolia Bridge. There will be an odor control/electrical facility associated with the storage tank. Community input will help to inform design of the ancillary equipment facility and landscape restoration. Project elements include: - An underground diversion structure located in the right-of-way under 32nd Ave West
- Approximately 3,000 lineal feet of gravity sewer line connecting the diversion structure to the storage tank to convey peak flows during a wet weather event
- An underground storage tank in the Port of Seattle’s Terminal 91 West Yard south of the Magnolia Bridge
- An underground structure at one end of the storage tank that will include small pumps to discharge stored flows after storms have passed
- A pipe connecting the storage tank to the South Magnolia Trunk line to return wastewater to the pump station after the wet weather event
- An ancillary equipment facility including odor control and electrical equipment, located in the Port of Seattle’s Terminal 91 West Yard area
- Restoration of the right-of-way in accordance with permit conditions
- Surface restoration in affected project area
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