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NPL Site Narrative for Milan Army Ammunition Plant

Milan, Tennessee

Federal Register Notice:  July 22, 1987

Conditions at proposal (October 15, 1984): The Milan Army Ammunition Plant (AAP) in Milan, Gibson County, Tennessee, produces munitions for the U.S. Army. The "O" Line at Milan, a conventional munition demobilization facility, operated from 1942 until December 1978. The major function of the "O" Line was to remove explosives (TNT and TNT-RDX mixtures) from munitions by injecting a high-pressure stream of hot water and steam into the open cavity of the munitions. Effluent from the "O" Line operation was discharged into 11 unlined settling ponds with an estimated capacity of 5.5 million gallons. Between 1971 and 1981, sediments were routinely dredged from the ponds and stored on the ground. In 1981, the ponds were lined, and the accumulated sediments placed into the ponds.

Analyses of samples collected in March 1979 from on-site water supply and monitoring wells indicated the presence of explosives and heavy metals. Three water supply wells serving the City of Milan and numerous private wells are located less than 3 miles from the area of known ground water contamination. The direction of ground water flow has not been completely determined. AAP supply wells are located on-site. More than 13,000 people within 3 miles of the site depend on ground water as a source of drinking water.

Milan AAP is participating in the Installation Restoration Program, established in 1978. Under this program, the Department of Defense seeks to identify, investigate, and clean up contamination from hazardous materials. The Army has completed Phase I (records search) and Phase II (preliminary survey). Phase IV (remedial action) is being undertaken to close the "O" Line ponds.

Status (July 22, 1987): EPA is reviewing cleanup work completed to date to determine if it is comparable to EPA's guidance for remedial investigations/feasibility studies and complies with the National Contingency Plan, the Federal regulation by which CERCLA is implemented.

EPA is developing a permit under Subtitle C of the Resource Conservation and Recovery Act (RCRA). The permit would cover cleanup of the CERCLA portions of Milan.

Within the boundaries of this Federal facility, there are areas subject to the Subtitle C corrective action authorities of RCRA. However, no such areas were included in scoring this specific site. Therefore, this Federal facility site is being placed on the Federal section of the NPL under the NPL/RCRA policy announced on September 8, 1983 (48 FR 40662).

For more information about the hazardous substances identified in this narrative summary, including general information regarding the effects of exposure to these substances on human health, please see the Agency for Toxic Substances and Disease Registry (ATSDR) ToxFAQs. ATSDR ToxFAQs can be found on the Internet at ATSDR - ToxFAQs (http://www.atsdr.cdc.gov/toxfaqs/index.asp) or by telephone at 1-888-42-ATSDR or 1-888-422-8737.

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