U.S. EPA Contaminated Site Cleanup Information (CLU-IN)


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MEMORANDUM: CONTINGENT REMEDY EVALUATION [FOR GENERAL ELECTRIC SOUTH DAWSON ST.]
Washington State Department of Ecology, 15 pp, 2018

Environmental contamination at the former General Electric Aviation Div. facility (220 S. Dawson St., Seattle) will be cleaned up under RCRA and as part of Washington Ecology's source control strategy to control sources of pollution to the Duwamish River. PCE, TCE, 1,1,1-TCA, fuels, and oils affect soil and groundwater beneath the 220 South Dawson Street building, and their vapors affect the indoor air. Pump and treat is ongoing at the site. GE also conducted injections of aqueous persulfate into the contaminated groundwater below the property in March 2017 and installed persulfate slow-diffusion release bags into several groundwater wells on the property in October 2017, but these in situ chemical oxidation remedial alternatives were insufficiently effective in reducing groundwater contaminant concentrations. This memorandum presents a comparison of alternative treatment technologies and recommends in situ chemical reduction using EHC®—a solid material composed of a plant-based carbon source and zero-valent iron—to remediate the residual COCs associated with the site's shallow soil and groundwater impacts. Under Ecology oversight, GE will implement the recommended remedy. See the memorandum at https://fortress.wa.gov/ecy/gsp/DocViewer.ashx?did=75732 and additional information on this site at https://fortress.wa.gov/ecy/gsp/Sitepage.aspx?csid=2446.



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