Building a new storage tank and new sewer pipeline to safeguard the Duwamish River
May 18, 2016
We have come to a major milestone on the project: construction activities are beginning this week on the Bayview portion of the project.
The first activity you will notice is the removal of the small building between the Bartells and Mutual Fish on Rainier Ave S. Additional work that includes some lane closures on Rainier Avenue S and S Bayview Street will begin shortly afterwards. Lane closures of longer than 30 minutes will be done during the weekend hours listed below. Updates about this work and next steps will be provided as construction progresses.
Work hours for this part of the project:
Regular work hours fall between 7:00 AM and 3:30 PM Monday through Friday. Work that alters traffic in Rainier Ave. S. for less than 30 minutes (e.g. traffic may be stopped while a truck backs into a driveway) may take place during regular work hours.
Weekend hours: work in Rainier Ave. S. and S. Bayview St. will only occur between 5:00 PM on Saturday evening and 2:00 AM on Monday morning. During weekend hours, traffic may be reduced to one lane.
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.