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HWAAP-B09
BUILDING 101-32 CATCHMENT PIT
SITE DESCRIPTION
HWAAP-B09 is an inactive unlined surface impoundment located east of Building 101-2 and measures approximately 100 by 155 by 8 feet. It consists of  three interconnected ponds; one smaller pond containing a concrete settling tank and two large ponds used for overflow of liquids. The impoundment was in operation from 1940 to the early 1970's and received large amounts of waste water containing TNT and RDX. Ground water is estimated to be at approximately 120 feet bgs but has not been sampled at this site. In December 1992 and May 1994 the concrete settling tank was partially filled with water and sludge. TNT stained soils are visible in the settling ponds and soil sampling confirmed (1988-1992) the contamination of the soil with explosives and metals. Remedial Investigation work in 1994 included sludge sampling, surface soil and hand auger sampling, and cone penetrometer soundings to a depth of 59 feet bgs. One sludge sample, five surface soil samples, five hand auger samples and three cone penetrometer soil samples were collected and analyzed for metals and explosives. Low levels of metals (except beryllium) and explosives (except RDX) were detected in the soil. However, the visibly stained soils that are present at the site contained explosives at such high levels that samples could not be shipped for analysis. Up to 230 mg/kg of RDX was detected in the shallow soil exceeding the remediation goal of 64 mg/kg. Up to 0.62 mg/kg of beryllium was detected in soil. Contamination exceeds NDEP requirements. 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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