Hawthorne Army Depot

HWAAP-B23
BUILDING 103-30 CATCHMENT PIT

SITE DESCRIPTION
HWAAP-B23 is an inactive unlined surface impoundment located south of Building 103-30 and measures 15 by 60 by 4 ft. The pit is eroded and partially filled with windblown sand. This impoundment was in operation from 1940 to the early 1970's and received moderate amounts of waste water containing TNT and RDX. Remedial Investigation work in 1994 included two surface soil samples, two hand auger samples and one cone penetrometer soil sample that were collected from within the impoundment and analyzed for explosives and metals. Elevated concentrations of explosives; HMX (4,000 mg/kg), RDX (33000 mg/kg), 1,3,5-TNB (13 mg/kg), 2,4,6-TNT (150,000 mg/kg), 2,4-DNT (12 mg/kg) were detected in the soils. Low concentrations of metals and picric acid were detected. Analytical results show concentrations of explosives reduce significantly with depth. Soil composting was completed in 1999. There has been no impact to the groundwater from metals or explosives. However because of the potential for contamination, wells are monitored quarterly (began in 1997).

Aerial Photo (black & white --125KB)

PROPOSED PLAN
A Closure Decision Document was approved by the NDEP in November 2001.

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