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December 19, 2018
King County's Georgetown Wet Weather Treatment Station earned a platinum rating from the Institute for Sustainable Infrastructure's Envision rating system.
In a press release, the county said this is the first platinum Envision project in Washington.
Construction of the $262 million station, at the northwest corner of Fourth Avenue South and South Michigan Street, is expected to be complete in 2022.
The project is designed to treat combined sewer overflows before they enter the Lower Duwamish Waterway. It will treat up to 70 million gallons of wastewater and stormwater a day.
Sustainable features include a local-hire requirement; public art and green space; a design advisory group; diverting more than 85 percent of demolition materials from the landfill; restoring the Duwamish River shoreline; reducing chemical use; planning for a changing climate; and green infrastructure, including permeable pavement, green roof, roadside rain gardens and cisterns.
The county said the station was the first project chosen by the Environmental Protection Agency to receive a new type of low-interest loan under the Water Infrastructure Finance and Innovation Act, saving ratepayers about $34 million.
The county said pursing platinum certification played a role in the EPA's funding decision.
The team includes The Miller Hull Partnership and Signal Architecture + Research, architecture; Flatiron West Inc., contractor; Jacobs Engineering and HDR, prime engineering consultant and project lead; Berger Partnership, landscape architecture; Blanca Lighting, lighting design; Sans Facon, lead artist; and Enviroissues, public outreach.