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HWAAP-B11A
BUILDING 101-31 CATCHMENT PIT
SITE DESCRIPTION
HWAAP-B11A is an inactive unlined surface impoundment on the north side of Building 101-31 and measures 45 by 20 by 3 feet. The impoundment is partially filled with windblown sand and tumbleweeds and is partially eroded. Small piles of dredged soil are located on the sides of the impoundment. 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. Soil sampling taken (1988-92) have confirmed the contamination of the soil with explosives. Remedial Investigation work in 1994 included surface soil and hand auger sampling, and cone penetrometer soundings. One surface soil sample, one hand auger sample and two cone penetrometer soil samples were collected and analyzed for metals and solvents. Solvents, metals (except beryllium and lead) and explosives were detected below PCGs. Bioremediation was selected as the RA and was completed in 1999.
PROPOSED PLAN
A Closure Decision Document was approved by the NDEP in February 2001.
Decision Document
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