King County’s Wastewater Treatment Division (WTD) is building a new wet weather treatment station (WWTS) in Georgetown at the corner of Fourth Avenue South and South Michigan Street. As part of the WWTS project, WTD is also building a new outfall structure under the First Avenue South Bridge and connecting pipes from the station to the outfall. Read below for updates on all three project areas, highlights from the past month, and upcoming work.
Check out our monthly highlight at the end of this update that celebrates the project’s Platinum Envision award, which recognizes the County’s commitment to sustainable communities and the environment.
Treatment Station
In January, King County’s contractor continued work to construct the influent pump station, regulator structure, and other supporting pipes and structures around the site. Crews installed the lid on the underground portion of the regulator structure (see photo below).
 Crews working on the regulator structure, which will divert flows as needed during heavy rain events.
Outfall Pipe
Earlier this month, crews made great progress and wrapped up work on the drop structure at the outfall site under the First Avenue South Bridge. Once operational, the drop structure will direct flows of effluent water (treated water from the new facility) into the Duwamish River. As construction continues in the river, crews will use a technique called dredging to remove soils from the area where pipe will be placed (see photo below). Restoration of the area will be completed after the outfall pipe is installed. Crews will continue to work in the Duwamish River until February 15 as allowed by permits. The remainder of the work to complete the outfall will occur during next year’s in-water work window.
 The contractor uses an excavator to prepare the riverbed at the outfall site.
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