Building a new storage tank and new sewer pipeline to safeguard the Duwamish River
August 18, 2016
Rainier Avenue South to be closed for weekend work between South College Street and 25th Avenue South
Starting as soon as August 20th, King County contractors will begin installing shoring in Rainier Avenue South to support their work on the Rainier Valley Wet Weather Storage project. The shoring will hold back dirt and other materials while the construction team works on the pipes that run under the road. During this work, Rainier Avenue South will be closed in both directions between South College Street and 25th Avenue South.
More details and a map of the area to be closed are in the attached project update (PDF). Businesses will be open as usual.
This project will keep sewage and stormwater out of the Duwamish River. A new sewer pipe will be installed near the intersection of Rainier Ave. S. and S. Bayview St. to send sewage and stormwater from a pipe that gets full during storms to another pipe that has more room.
A storage tank at the intersection of S. Hanford St. and S. 27th Ave. will catch any remaining extra sewage and stormwater to keep sewage and stormwater out of the Duwamish River.
King County’s pipes in Rainier Valley and elsewhere to send sewage and stormwater to a treatment plant in Magnolia to be cleaned. Pipes in the northern Rainier Valley get too much stormwater during storms and spill into the Duwamish River. These spills are called “Combined Sewer Overflows” or CSOs. King County will build new pipes and a new 340,000 gallon storage tank to keep more pollution out of the Duwamish.
Contact with raw sewage and stormwater can make people sick. Unless they are cleaned at a treatment plant, sewage and stormwater can also harm Puget Sound, Lake Washington and the Duwamish River. The pipes and plants we have to clean sewage and stormwater help keep us healthy.
Cleans up the Duwamish River
The new pipes and tank will avoid CSOs from Rainier Valley and keep sewage and stormwater out of the Duwamish River. They will keep the Duwamish River cleaner by keeping millions of gallons of water pollution out of the river each year (on average).
The County has different tools it can use to keep Rainier Valley’s sewage and stormwater out of the Duwamish River. Not every tool is right for every neighborhood. The Rainier Valley facility must work for a big, very busy area where a lot of people live and work.