North Beach CSO Control Project
January 13, 2014 Update
King County’s North Beach CSO Control Project team appreciated the opportunity to talk to community members who braved the weather to stop by the pre-construction open house on Saturday, January 11! If you were unable to attend, you can find displays and handouts HERE. People who still have questions or concerns can contact the project hotline at 206-296-7372 during business hours, or contact Monica Van der Vieren at 206-477-5502 or Monica.firstname.lastname@example.org.
On Thursday, January 16, King County Metro will run a test of the bus route coming from 24th Avenue Northwest and turning around on Northwest 100th Street to Northwest Neptune Place and back to 24th. We will provide an update once the test is completed.
Keep up to date on construction plans and activities
At this time, King County’s contractor is working on plans for construction that may require City of Seattle and/or King County approval. We will post updates as these plans are finalized. You can find construction information at the following locations:
• Work in the right-of-way
• Work on King County’s property
• Traffic control
North Beach Pump Station, located on King County property next to Blue Ridge Park, is built on the footprint of the former City of Seattle treatment plant.
King County is designing and building an underground storage tank in the right-of-way in N.W. Blue Ridge Drive and Triton Drive N.W. This facility will need to store about 230,000 gallons of peak flows when the North Beach Pump Station reaches maximum capacity.
Learn more about the project area and elements.
Why does King County need to do this project?
In 2008, King County reported that the North Beach combined sewer overflow facility has 10 overflows per year on average that discharge a total of 2.2 million gallons into Puget Sound off North Beach. At North Beach, King County is working to meet current regulations set by the Washington Department of Ecology require no more than one untreated discharge per year on a long term average.
This construction schedule is proposed and subject to change. Detailed construction schedules are being developed by King County’s contractor for the project, Stellar J Corporation.
Proposed Construction Schedule (PDF), January 11, 2014
Understanding the sewer system in North Beach
The North Beach Pump Station has provided wastewater service for the area since 1962 by collecting flows from the City of Seattle’s local sewer system. These flows are conveyed to the Carkeek Wet Weather Facility where they are either pumped to the county’s West Point Treatment Plant or, in large storm events, treated on site. The North Beach Pump Station is built on the footprint of what was once a City of Seattle treatment plant. The walls and foundation are from the original treatment plant.
Learn more: download Understanding the sewer system in North Beach, Winter 2014
Did you know?
- The North Beach Pump Station is built on the footprint of what was once a City of Seattle treatment plant. The walls and foundation are from the original treatment plant.
- When Metro was created by voters in 1958 to provide regional wastewater conveyance and treatment, local treatment facilities like the one in North Beach were considered for conversion to pump stations to bring flows to regional treatment facilities.
- The current service area for the North Beach Pump Station is 633 acres. Wastewater from additional areas within Blue Ridge are conveyed by gravity to the North Beach force main, where they combine with pumped flows to the Carkeek Wet Weather Facility.
- The North Beach Pump Station is largely built underground with access hatches and ventilation equipment above ground. Four pumps are used to convey up to 3 million gallons per day (mgd) of wastewater to Carkeek.
- The CSO facilities include a deepwater outfall upgraded in the 1970’s from the outfall that served the original treatment facility. Discharge to a second outfall, which usually conveys stormwater, helps to prevent backups into homes in large storms.
- The new CSO facility will introduce odor control at the North Beach site. Currently there is no odor control associated with the North Beach Pump Station. King County has not received odor complaints about this facility.