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HWAAP-B17A
BUILDING 101-20 CATCHMENT PIT
SITE DESCRIPTION
HWAAP-B17A is an inactive unlined surface impoundment connected with HWAAP-B17B and is located 5 feet south of Building 101-20. The pit measures 12 by 12 by 3 feet. The sidewalls of the pit are partially eroded and the pit is partially filled with windblown sand. No piles of dredged soil are visible at this site. This impoundment was in operation from 1940 to the early 1970's and received large amounts of waste water containing TNT and RDX. Visible evidence of TNT stained soils in and surrounding the impoundment between B17A and B17B were noted during site investigations (1988-1992). Remedial Investigation work in 1994 included surface soil and hand auger sampling and cone penetrometer sounding. Two surface soil samples, one hand auger samples and three cone penetrometer soil samples were collected and analyzed for explosives and metals. Elevated concentration of 1,3,5- TNB (31 mg/kg), 2-Amino-DNT (1.3 mg/kg), lead (130 mg/kg) and total chromium (130 mg/kg) were detected in the soil. RA by composting was completed in 1999.
PROPOSED PLAN
A Closure Decision Document was approved by the NDEP in April 2000.
Decision Document
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