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HWAAP-B07
BUILDING 101-1 CATCHMENT PIT
SITE DESCRIPTION
HWAAP-B07 is an unlined surface impoundment located southeast of Building 101-1 and measures approximately 15 feet by 12 feet. The pit  is approximately 4 feet deep. The impoundment was in operation from 1940 to the early 1970's and received large amounts of waste water containing TNT and RDX. Piles of dredged soil were located on all sides of the impoundment. Visible evidence of TNT stained soils in the impoundment was noted during site investigations. Soil sampling has confirmed the contamination of the explosives in the soil in 1988-1992. Ground water is estimated to be at approximately 120 feet bgs but has not been sampled at this site. Remedial Investigation work in 1994 included surface soil and hand auger sampling, and cone penetrometer soundings to a depth of 40 feet bgs. One surface soil sample, one hand auger sample and three cone penetrometer soundings were collected and analyzed for metals and explosives. Low concentration of metals (except beryllium) and explosives contamination were detected in the soil. Beryllium was detected in two samples collected from 31 and 40 feet below ground at 0.73 mg/kg and 0.67 mg/kg, respectively. This site was backfilled, graded and closed in 1999.
PROPOSED PLAN
A Closure Decision Document was approved by the NDEP in November 2001.
Decision Document
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