EPA ID# WA2890090077
EPA Region 10
Benton County

4th Congressional District

Other Names: USDOE-Hanford Site-300 Area
Last Update: May, 2010

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Media Affected: Groundwater, Soil & Sludges, Surface Water, Air
Groundwater is contaminated with uranium, volatile organic compounds, strontium-90, and tritium. Soils primarily contain uranium, cobalt-60, copper, polychlorinated biphenyls (PCBs), and chromium, but may also include other contaminants associated with research and development activities. DOE has detected uranium and TCE in groundwater adjacent to the Columbia River. People may be exposed to hazardous and radioactive substances through direct contact, accidental ingestion, and inhalation of contaminated particles, groundwater, soil, or surface water.

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Under an Interagency Agreement and Consent Order for cleanup and regulatory compliance at the DOE's waste sites at Hanford, EPA, DOE, and Washington State Department of Ecology jointly developed an action plan that addresses CERCLA and Resource Conservation and Recovery Act (RCRA)-related issues at Hanford. Waste sites and contaminated facilities are being remediated and removed.

As of the end of 2009, 96 waste sites had been remediated. Recently, 180,000 tons of waste was disposed at the Environmental Restoration Disposal Facility in 2008, and 95,380 tons in 2009. From August 25, 2005 to April 19, 2010, 410,780 tons of waste from these waste site remedial actions has been disposed. 144 facilities have been demolished and waste removed for disposal. 111 facilities remain. Most of the building cleanup removal actions have been performed in the past few years. From August 25, 2005 to April 19, 2010, 61,795 tons of waste from these facilities removal actions has been disposed. For both waste site remediation and facility removal actions, the combined waste disposal to the Environmental Restoration Disposal Facility from July 1, 1996 to April 18, 2010 is 1,699,890 tons.

The selected remedy for uranium-contaminated groundwater in the 300 Area is monitored natural attenuation, but this interim remedy is being reevaluated as part of the RI/FS process to support a final ROD for source and groundwater. The RI/FS Work Plan was approved April 8, 2010.

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