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HWAAP-B11B
BUILDING 101-34 CATCHMENT PIT
SITE DESCRIPTION
HWAAP-B11B is an inactive unlined surface impoundment located 40 feet north of Building 101-34 and measures 45 by 13 by 3 feet. The pit walls are partially eroded and the pit is partially filled with windblown sand. 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, RDX and lead-based paint. No visible evidence of TNT staining was noted during site investigations however dried paint is present in the impoundment. Soil sampling in 1997 confirmed the contamination of the soil with solvents and metals. 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 one cone penetrometer soil sample were collected and analyzed for metals and solvents. Solvent, metals (except beryllium and lead) and explosives were detected below PCGs. RA was removal of explosive contaminated debris in 1997. The site was reassessed in 1999, no further action was required.
PROPOSED PLAN
A Closure Document was approved by NDEP on December 6, 1999.
Decision Document
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