CCP 03-17-1994 - Laserfiche WebLink

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· .. t k Today most of TCAAP ~s ~n care a er status. However, there are a number of tenants utilizing several areas and buildings at the Installation - among them: Alliant Techsystems Inc., formerly Honeywell, Inc., which since the late 1950s manufactured fuzes and select ammunition; and 3M Company, which has manufactured self~ luminous materials, medical products and static eliminators since the late 1950s. Numerous areas and buildings are leased to local entities for storage. I THE PROBLEM/DISCOVERY: TCAAP used solvents in the production of metal shells and ammunition. These solvents were later determined to be hazardous. Environmental studies began at TCAAP in 1978 with a records search of past operations to determine if a significant potential hazard ., existed for contamination migration from the Installation. ENVIRONMENTAL RESTORATION: The U.S. Army Toxic and Ha~ardous Materials Agency (USATHAMA) Report No. 129 from 1978, and subsequent reports, indicated that any contamination would be contained on-post. However, in 1981 solvents were discovered in groundwater wells off-post, including . the City of New Brighton's municipal water supply. Since that time the Army, U. S. Environmental Protection Agency (EPA), and the Minnesota Pollution Control Agency (MPCA) have worked jointly to determine the contaminants involved, the extent of the contamina- tion, and the limits of the contamination plume off-post. To date, fourteen (14) disposal sites have been identified on TCAAP, with the main contaminants being solvents - primarily trichloroethylene (TCE) and pOly-chlorinated biphenyls (PCBs) and metals. TCE is a solvent that is used as a degreaser for metal. The maj or contributors of contaminati':m to the groundwater are Sites 0, G, and I. The New Brighton/Arden Hills Superfund site, consisting of a 25 square mile area of which TCAAP is a part, was added to the National Priorities List (NPL) in 1982, and in 1983 the funding (federal Superfund monies) was available to start the cleanup work. There have been many interim remedial actions taken to remove contamination at TCAAP. Some of the actions include: source removal, groundwater treatment (Boundary Groundwater Treatment System [BGRS]) and air stripping towers; temporary clay capping; soil treatment with an In-situ Volatilization (ISV) system (Sites o and G); and soil incineration to remove PCBs (Site 0). .