Superfund Record of Decision (EPA Region 8): Rocky Mountain Arsenal (Operable Unit 21), CO. (Ninth remedial action), June 1991

Technical Report · Thu Jun 06 04:00:00 EDT 1991

OSTI ID:7086072

The Rocky Mountain Arsenal (RMA) (Operable Unit 21) site comprises part of the 17,000-acre RMA site, which is a former U.S. Army chemical warfare and incendiary munitions manufacturing and assembly plant in Adams County, Colorado. From the 1950s until late 1969, the U.S. Army used the RMA facility to produce the nerve agent GB (isopropylmethyl-phosphonofluoridate). In addition, between 1947 and 1982, private industries leased major portions of the plant's facilities to manufacture various insecticides and herbicides. Operable Unit 21 (OU21), the South Tank Farm Plume (STFP), is one of several areas being addressed as part of the Other Contaminated Sources IRA. From 1947 to 1978, STF tanks 464A, 464B, and others were used intermittently to store bicycloheptadiene (BCHPD) and dicyclopentadiene (DCPD) bottoms generated from pesticide manufacturing. A number of U.S. Army investigations have revealed ground water contamination originating from the areas of light nonaqueous phase liquid (LNAPL) located near tank 464A. Recent investigations have shown that the STFP does not pose significant risk to public health or the environment. The ROD addresses interim management of migration of the STFP and is consistent with the Final Response Action. The primary contaminants of concern affecting the ground water are VOCs including benzene, toluene, and xylenes. The selected interim remedial action for the site is included.

• Research Organization: Environmental Protection Agency, Washington, DC (United States). Office of Emergency and Remedial Response
• OSTI ID: 7086072
• Report Number(s): PB-92-964405/XAB; EPA/ROD/R--08-91/050
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540250* -- Environment
Terrestrial-- Site Resource & Use Studies-- (1990-)
ALKYLATED AROMATICS
AROMATICS
BENZENE
CHEMICAL INDUSTRY
CHEMICAL WARFARE AGENTS
COLORADO
CONTAMINATION
DEVELOPED COUNTRIES
FEDERAL REGION VIII
GROUND WATER
HAZARDOUS MATERIALS
HYDROCARBONS
HYDROGEN COMPOUNDS
INDUSTRY
LAWS
MANAGEMENT
MATERIALS
NORTH AMERICA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PESTICIDES
POLLUTION
POLLUTION LAWS
REMEDIAL ACTION
TOLUENE
US SUPERFUND
USA
WASTE DISPOSAL
WASTE MANAGEMENT
WATER
WATER POLLUTION
WEAPONS
XYLENES