February 27, 2015 Update Construction continuing on underground diversion structure on 32nd Avenue West
King County’s contractor, Walsh Construction, is installing an underground structure on 32nd Avenue West that will transfer flows from existing sewer lines to a recently installed gravity sewer pipeline. The new 3,000-foot sewer pipeline along with an underground storage tank, will help reduce overflows of storm water and sewage to Puget Sound during heavy rain storms.
Work activities are located near the detour on 32nd Avenue and include completion of the shoring system.
Stellar J Construction is finishing up concrete pour for the storage facility walls and columns. In March, work will begin to build the concrete lid for storage tank.
Young bald eagles appear larger and darker than their white-headed parents.
King County is constructing a new combined sewer overflow (CSO) control facility in Magnolia. A 1.5-million gallon underground tank will temporarily store excess flows of stormwater and sewage when heavy rains fill pipes, reducing untreated overflows to Puget Sound. A second component of this facility is a new 3,000-foot gravity sewer pipeline installed from 32nd Avenue West below Magnolia Bluff that will transfer excess flows to the new CSO control facility on 23rd Avenue West in the Smith Cove area.
On 32nd Avenue West, construction crews will install the new gravity sewer pipeline that will be drilled under the hill to the Smith Cove Athletic Field to connect to the underground storage tank on 23rd Avenue West. See map on right.
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 control combined sewer overflows (CSOs) in local waterways. When completed, the project will meet current Washington Department of Ecology requirements of no more than one CSO discharge 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.
Magnolia Boulevard Park has a pair of bald eagles that have resided in a cottonwood tree above 32nd Avenue West for several years. During project design and as construction approached on 32nd, Hillary Schafer, King County’s Environmental Planner, worked closely with local and federal environmental agencies to develop plans for work around the eagle nests. Plans in place include seasonal restrictions on certain activities during mating seasons, monitoring and other accommodations for the birds. For more information, view the Fall 2014 Newsletter (PDF) or contact Hillary.Schafer@kingcounty.gov.