North Beach CSO Control Project
December 17, 2015
Last week the North Beach Wet Weather Storage Facility was put to the test with back-to-back record storms in our area. The North Beach Pump Station sent as much wastewater and stormwater as possible to the Carkeek Wet Weather Facility, and the storage tank filled and emptied three times over the stormy period. These storms resulted in a lot of storage and treatment, and still caused combined sewer overflows – both treated and untreated - throughout the combined sewer area, in both the City’s and the County’s system.
How did the new North Beach Wet Weather Facility perform during recent storms?
During this stormy period, facility performed as designed; when we crunch all the data, we’ll let you know how much it stored. What we do know now is that:
• The storage tank filled and emptied at least three times, and was operational again on Saturday,
• The system experienced a limited period of CSO discharge during the height of the storm, and
• The discharge occurred only through the main outfall to Puget Sound; larger piping was installed as part of this project to get more flows to the pump station and reduce potential for overflows to the beach.
View project update (December 15, 2015).
Finish work to continue in early 2016
While the bulk of construction work will be completed in mid-December, the contractor will be completing some work on the pump station site through early 2016. This includes work on the new building and final landscaping. Crews will access the pump station site intermittently on weekdays between 7 a.m. and 6 p.m. to complete this work.
King County operation crews will start accessing the site
As in the past, County crews will visit the site on a scheduled basis to monitor pump station operations and conduct routine maintenance work. This will usually involve a small crew with one or two vehicles on site. This routine maintenance work will not affect traffic or access around the pump station. As the storage facility begins operations, you may see crews checking the new vaults.
Who do you call?
For operational concerns or complaints, call West Point Treatment Plant’s 24-hour phone line at 206-263-3801. This phone line is staffed around the clock.
The construction hotline will be staffed from 8 a.m. to 5 p.m. Monday through Friday. If you call outside of these times, we will call you back on the next business day.
Questions? Comments? Concerns?
24/7 Construction Hotline: 206-296-7372
Leave a message, and a project team member will return your call.
Project Contact: Monica Van der Vieren, email@example.com
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 building an underground storage tank in the right-of-way in N.W. Blue Ridge Drive and Triton Drive N.W. This facility will be able to store to 380,000 gallons of untreated water during 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 had 10 overflows per year on long-term 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.
King County appreciates your patience as we continue building this mandated project.
View construction update (in yellow box at top of page) for latest schedule.
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.