Shoring removal begins at CSO storage tank site
Stellar J Construction will begin removing the shoring that surrounds the new underground storage tank on Monday, April 6th. This 1.5 million gallon tank will store excess flows of stormwater and wastewater during large storms, reducing overflows to Puget Sound. Crews will pull shoring from the ground using a vibratory method. People in the area will notice noise from this activity. Sheet removal will take about a week to complete.
Second detour beginning on 32nd Avenue West
Traffic patterns on 32nd Avenue West changed this week, moving traffic to the east side of the road. Motorists and pedestrians should travel slowly, watch for flaggers, pedestrians, and other vehicles, and follow signs and directions. Crews will begin building an underground structure in the middle of the road.
Young bald eagles appear larger and darker than their white-headed parents.
Storage tank concrete base and sewer pipeline installation complete!
King County is constructing a new combined sewer overflow (CSO) control facility in Magnolia to reduce overflows of untreated stormwater and wastewater into Puget Sound during heavy rains. At the end of 2014, King County’s contractors completed two important milestones. Stellar J Corporation successfully carried out a continuous concrete pour to install a 12-foot thick concrete base slab for the 1.5 million gallon underground storage tank.
The second component of this facility is a new gravity sewer pipeline. Walsh Construction and Mears Group, Inc. completed the final step in the Horizontal Directional Drilling (HDD) process, pulling almost 3,000 feet of pipeline through a borehole extending from 32nd Avenue West to an exit pit on 23rd Avenue West. During wet weather, stormwater and sewage will be diverted through this pipeline to the newly constructed underground storage tank across from Smith Cove Park.
Why does King County need to do this project?
This project is part of a long-term King County plan to help protect Puget Sound and reduce the number of combined sewer overflows (CSOs) in local waterways. In 2013, King County reported a long term average of 22.7 overflows per year from the Magnolia Outfall. The new CSO Control Facility is designed to reduce overflows to Elliott Bay to no more than one per year on a long-term average. The project is included in a federal consent decree that requires completion by December 2015.
What is the schedule for this project?
Planning and design for this project took place from 2007 to 2013. Construction began in 2014 and is scheduled for completion in 2015.
In recent months, area neighbors have reported sightings of bald eagles that built a nest in Magnolia Boulevard Park above 32nd Avenue West. We are monitoring the eagles until August, when work at the site will be complete. Work activities must adhere to seasonal restrictions to create the least disturbance for the birds. For more information, view the Fall 2014 Newsletter (PDF) or contact Hillary.Schafer@kingcounty.gov.