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Record of Decision System (RODS)

HANFORD 200-AREA (USDOE)

Abstract

Site Name:  HANFORD 200-AREA (USDOE)
Address:  200 AREA 
City & State:  BENTON COUNTY  WA  99352
County:  BENTON
 
EPA ID:  WA1890090078
EPA Region:  10
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-97/048
ROD Date:  02/11/1997
Operable Unit(s):  12
 
Media:  Groundwater
 
Contaminant:  uranium, technetium-99, nitrate, carbon tetrachloride
 
Abstract:  The Hanford site is a 560-square mile facility located along the Columbia River in southeastern Washington, situated north and west of the cities of Richland, Kennewick, and Pasco, an area commonly known as the Tri-Cities. The 200 Area is located in the central portion of the Hanford site, and covers less than 15 square miles. The 200-UP-1 operable unit (OU) is located in the 200 West area of the 200 Area. Contamination of the groundwater in the OU resulted from historic discharges, primarily from the uranium processing plant.The land surrounding the Hanford site is used primarily for agriculture and livestock grazing. The major population center is the Tri-Cities, with a combined population of approximately 100,000.The Hanford site was established during World War II as part of the Army┬┐s Manhattan Project to produce plutonium for nuclear weapons. Hanford site operations began in 1943. Much of the land the Hanford site now occupies was originally ceded to the government by a treaty with various Native American tribes. Certain portions of the Hanford site are known to have cultural significance and may be eligible for listing in the National Register of Historic Places. The 200 West area is an operational area of almost 2-square miles where spent nuclear fuel was processed in four facilities. The 200-UP-1 OU is one of two groundwater OUs located in the 200 West area. Contamination resulted from historic discharges to five primary liquid waste disposal sites.
 
Remedy:  The selected remedy consists of pumping the highest concentration zone of the contaminated groundwater plume at 200-UP-1 and treatment using the existing effluent treatment facility (ETF) located in the 200 East area. The selected remedy is intended to reduce contaminant mass within the plume and minimize migration of uranium and technetium-99 from the 200 West area. The selected remedy will remove and treat these two contaminants of concern, in addition to the specific co-contaminants of nitrate and carbon tetrachloride, which exist within the groundwater. The ETF will be used for the treatment and removal of contaminants of the groundwater. The ETF is a multistage facility that can remove and/or destroy a large number of contaminants, including nitrate and carbon tetrachloride, which are present in high concentrations.
 
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