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HWAAP-B16
BUILDING 101-18 CATCHMENT PIT
SITE DESCRIPTION
HWAAP-B16 is an inactive unlined surface impoundment located northwest of the conveyor ramp for Building 101-18 and measures 33 by 60 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 south side and a sump is located on the southwest corner. The sump does not appear to be connected to this impoundment. This site 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 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, two hand auger samples and two cone penetrometer soil samples were collected and analyzed for explosives and metals. Laboratory analysis of surface and subsurface soil detected RDX (1200 mg/kg), 2,4,6-TNT (5600 mg/kg), 1,3,5-TNB (210 mg/kg), 2-amino-DNT (29 mg/kg), and 2,4-DNT (4.0 mg/kg) that exceeded the remediation criteria. RA by composting was completed in 1999.
PROPOSED PLAN
A Closure Decision Document was approved by the NDEP in April 2001.
Decision Document
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