The Rocky Mountain Arsenal (RMA) (Operable Unit 17) is a 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 (isopropyl methyl-phosphonofluoridate). In addition, between 1947 and 1982, private industries leased major portions of the plant facilities to manufacture various insecticides and herbicides. Since 1970, facility operations have primarily involved the destruction of chemical warfare materials. Operable Unit 17 (CERCLA Wastewater Treatment System) is among those IRAs specified. The ROD addresses the interim remedy to develop and implement a program to treat contaminated wastewaters resulting from the assessment and implementation of response actions at the RMA site. The primary contaminants of concern affecting the wastewaters are VOCs including benzene, PCE, toluene, and TCE; other organics including pesticides; and metals including arsenic, chromium, and lead.