I as a testing ground for munitions, including chemical-warfare agents. From shortly after World War II into the 1970's, chemicalwarfare agents, high-explosive munitions, and industrial chemicals were tested and disposed of at J-Field by open-pit burning and by highexplosive demolition. Only emergency disposal operations have been conducted at J-Field since the early 1980's. Soil, surfacewater, and groundwater contamination has resulted from the migration of unburned chemicals and fuels from the disposal areas. Discharge of contaminants from ground water and runoff has resulted in surface-water contamination in the marshes and ponds in J-Field. This investigation was conducted from 1989 to 1994 as part of a remedial investigation of J-Field in response to Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) requirements. The nature and extent of contamination was assessed at five sites: the toxic-materials disposal area, the white-phosphorus disposal area, the riotcontrol-agent disposal area, the Robins Point

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