EPA ID# WA4890090075
EPA Region 10
Benton County

4th Congressional District

Other Names: Hanford Site-1100, USDOE-Hanford Site 1100-Area
Last Update: April, 2010

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Media Affected: Groundwater, Soil & Sludges, Environmentally Sensitive Area
Wells near the 1100 Area have volatile organic compounds (VOCs), including trichloroethylene (TCE). The soil is contaminated with asbestos, heavy metals, and polychlorinated biphenyls (PCBs). People could be exposed to hazardous substances through direct contact (ingestion) of contaminated groundwater and soil.

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In May 1989, EPA, the State, and DOE entered into an Interagency Agreement and Consent Order to design a process and legal framework for cleanup and regulatory compliance at the waste sites at Hanford. EPA, DOE, and Washington State Department of Ecology developed an action plan that addresses Superfund and Resource Conservation and Recovery Act (RCRA) issues. A site investigation and risk assessment were completed in 1992 by DOE. A Record of Decision (ROD) signed on September 30, 1993 authorized the following actions: removing about 130 cubic yards of soil with bis(2-ethylhexyl)phthalate and sending it to an incineration facility; removing 165 cubic yards of soil contaminated with PCBs and disposing of it at a permitted facility; closing the landfill inside the Hanford site; and monitoring groundwater until cleanup goals are met by natural processes over time. In 1995 construction of the remedy was finished. Groundwater now meets the drinking water standard for trichloroethylene.

Since the 1100 Area was deleted from the NPL on September 30, 1996, DOE is leasing and/or transferring ownership of several of the 1100 Area facilities. Private enterprises are now operating in the facilities.

Five-Year Reviews performed in 2001 (by EPA) and 2007 (by DOE) confirmed that the remedy at Hanford 1100 site remain protective of human health and the environment.

The next Five-Year Review is scheduled to be completed in 2012.

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