The 75-square-mile Hanford Site 200-Area (USDOE) site is located 17 miles north-northwest of Richland, Washington. The site is one of the four areas listed on EPA�s National Priorities List (NPL) located within the U.S. Department of Energy (DOE)-managed Hanford site. The Hanford Site 200-Area site is located in the Central Plateau portion of the Hanford site and contains former chemical processing plants and waste management facilities. One of the old plants discharged massive quantities of carbon tetrachloride onto the ground. Site activities also included processing, finishing and managing nuclear materials, including plutonium. About one billion cubic yards of solid and diluted liquid wastes (radioactive, mixed and hazardous substances) were disposed in trenches, ditches and in an on-site landfill. These operations and waste disposal activities created about 1,000 waste areas on site and contaminated soil, groundwater and surface water with hazardous chemicals and radioactive constituents. EPA divided the site into several cleanup areas, or operable units (OUs), to better address site contamination. Remedy construction has been completed at several OUs. Remedial investigations, removal actions and remedy design and construction are underway at the remaining OUs.