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February 5, 2024

Best in State: Gold Award
Original or Innovative Application
of New or Existing Techniques

Photo from ACEC Washington
The “theater of a storm” illuminates facilities during wet weather events so passersby can see that the facility is operating.

Jacobs Engineering Group

Project: Georgetown Wet Weather Treatment Station
Client: King County Wastewater Treatment Division

Jacobs provided design and construction management services for the Georgetown Wet Weather Treatment Station, a satellite treatment facility encompassing over 30,000 square feet of wet weather treatment station buildings, 2,500 linear feet of conveyance, a 54-inch-diameter outfall, and site preparation and demolition.

The team’s innovative foundation design helped to effectively reduce construction costs. Given the site’s seismic activity and historical contamination, Jacobs conducted a site-specific seismic response study and a probabilistic seismic hazard analysis, resulting in reduced seismic loading and liquefiable soil thickness.

The project utilized flow equalization, ballasted sedimentation and ultraviolet disinfection to accommodate necessary treatment on the very small facility footprint. The combination of ballasted sedimentation and ultraviolet disinfection was an infrequently used combination at the time of design.

Treatment processes were set on rigid inclusions to minimize noise, vibrations and spoils generation, while a soil structure interaction model mitigated post-construction settlement. The project optimized design through 3D modeling and virtual reality, allowing detailed evaluation of layouts and clash detection. Sustainability was a focus throughout, earning the project Envision Platinum certification.

The project came in on budget and on schedule. The project is a great example of innovative foundation design and advanced modeling, setting a new standard for wastewater treatment plants.


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