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HWAAP-B06
BUILDING 101-13 IMPOUNDMENT
SITE DESCRIPTION
HWAAP-B06 is a double-lined surface impoundment approximately 85'x15'x15' designed to collect explosive-contaminated wash down  water from demilitarization operations. The impoundment was never used, however, the soil used to construct the impoundment was from a previous unlined impoundment used to collect explosive wash down water from 1944 to 1977. The newer lined impoundment was constructed at the same location as the older unlined impoundment. A 1989 Remedial Investigation included collecting near surface, subsurface and ground water samples from within and adjacent to the impoundment. High concentrations of explosives were detected in the soil samples and only ammonium picrate was detected in the ground water at a concentration of 3,600 ug/L. Additional Remedial Investigation work in 1994 included 5 surface samples collected. Concentrations of explosives and semi-volatile organic compounds were detected in these soil samples above 5 mg/kg and 70 mg/kg respectively. Visual staining from explosives were observed and at such high levels that samples could not be shipped for analyses. Ground water samples were found to contain low level of explosives. Twenty-five feet of cone penetrometer sounding was conducted at 1 location to assess the optimal depths to collect subsurface soil samples. Contamination exceeds NDEP requirements. RA by composting was commenced in 1998 and completed in 1999.
PROPOSED PLAN
A Closure Decision Document was approved by the NDEP in November 2001.
Decision Document
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