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HWAAP-B17B
BUILDING 101-20 CATCHMENT PIT
SITE DESCRIPTION
HWAAP-B17B is an inactive unlined surface impoundment connected with HWAAP-B17A and is located 100 feet south of Building 101-20 and measures 60 by 21 by 6 feet. The sidewalls of the pit are partially eroded and the pit is partially filled with windblown sand. A discharge pipe enters the impoundment from the north side. A pile of dredged soil is located at the Eastend of the impoundment. This impoundment was in operation from 1940 to the early 1970's and received large amounts of waste water containing TNT and RDX. There was no visible evidence of TNT stained soils were observed on the surface between B17A and B17B. Remedial Investigation work in 1994 included surface soil and hand auger sampling, and cone penetrometer soundings. Three surface soil samples, one hand auger sample and two cone penetrometer soil samples were collected and analyzed for explosives and metals. Elevated concentrations of 1,3,5- TNB (60 mg/kg) was detected in soil. RA by composting was completed in 1999.
PROPOSED PLAN
A Closure Decision Document was approved by the NDEP in August 2000.
Decision Document
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