King County's Murray Combined Sewer Overflow Wet Weather Facility

HDR Project Receives Municipal Water Protection Award

Eric Bergstrom, left, and Dan Pecha with the award.

An HDR project, King County’s Murray Combined Sewer Overflow Wet Weather Facility project in Washington, has received the Pacific Northwest Clean Water Association Municipal Water Protection Award.  King County received the award at the association’s 2018 conference. Eric Bergstrom, HDR conveyance designer, project manager and technical design lead on the project, accepted the award on the county's behalf.

HDR provided lead design and engineering support during construction for the project, which allowed King County’s wastewater treatment division to maintain capacity to convey flow from the 992-acre Murray combined sewer basin while minimizing combined sewer overflow events. The project team was led by Dan Pecha, an HDR vice president based in the firm's Bellevue, Washington, office.

King County has a history of reducing the discharge of untreated stormwater and wastewater into Puget Sound. An integral part of the program is the new Murray CSO Combined Control Project, which minimizes overflows by storing up to 1 million gallons of excess combined sewage. During heavy rain, the Murray Avenue Pump Station capacity can be exceeded, releasing untreated sewer overflow into Puget Sound. The new storage system reduces yearly CSO events from five to one, meeting the EPA Consent Decree and improving Puget Sound water quality.

Using a unique circular gravity-fed storage tank, automated cleaning system and odor control system, the facility efficiently fulfills its duty while blending into the neighborhood. Extensive community involvement — including public meetings, a charrette process and advisory groups — reduced visual impacts.

The facility is a model for enhancing the environment and infrastructure while creating public space that effectively integrates with the adjacent Lowman Beach Park. The facility encourages public access, improves connectivity and enhances environmental stewardship with a green roof, bioretention swales and permeable pavement to treat stormwater runoff. Artwork creates a “Mountains to Sound” theme, a metaphor for water’s journey from the Cascades to the shoreline, a journey reflected in the facility’s use.

About HDR

For more than a century, HDR has partnered with clients to shape communities and push the boundaries of what’s possible. Our expertise spans nearly 10,000 employees, in more than 200 locations around the world — and counting. Our engineering, architecture, environmental and construction services bring an impressive breadth of knowledge to every project. Our optimistic approach to finding innovative solutions defined our past and drives our future.