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HWAAP-B08
BUILDING 101-1 SOUTH CATCHMENT PIT
SITE DESCRIPTION
HWAAP-B08 is an inactive unlined surface impoundment located southwest of Building 101-1 and measures approximately 45 by 72 by 6 feet. Two discharge  pipes from Building 101-1 enter the impoundment on the east side and one discharge pipe enters the impoundment at the southern corner near a manhole. The 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 the impoundment was noted during site investigations (1988- 1992). Soil sampling has confirmed the contamination of the soil with explosives. Groundwater 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 47 feet bgs. Three surface soil samples, three hand auger samples and two cone penetrometer soil samples were collected and analyzed for metals and explosives. Low concentrations of metals (except beryllium) and elevated concentration of RDX (up to 2500 mg/kg) were detected in soil. Investigation result shows concentration of RDX reduce significantly with depth. Beryllium was detected up to 0.89 mg/ kg. Contamination exceeds NDEP requirements. Based on the conclusion that the metals and explosives impacted soils of have not impacted the ground water, no remediation of the ground water is required. Groundwater monitoring has been transferred to HWAAP-B12. A RA of bioremediation was completed in 1999.
PROPOSED PLAN
A Closure Decision Document was approved by the NDEP in August 2000.
Decision Document
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