Superfund Site Profile
The 60-acre Midway Landfill site is located in King County, Washington. The former gravel quarry operated as a municipal solid waste landfill from 1966 to 1983. The landfill accepted demolition materials, wood waste and industrial wastes. Landfilling activities contaminated groundwater and air with hazardous chemicals. Following cleanup, operation and maintenance activities and monitoring are ongoing.
The City of Seattle completed a Remedial Investigation/Feasibility Study (RI/FS) pursuant to a consent decree with the State, signed in May 1990. The initial response (concluded by November 1992) included an active gas control system; landfill surface filling and grading; landfill cap installation; storm water detention ...
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