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HWAAP-B13
BUILDING 101-29/36 CATCHMENT PIT
SITE DESCRIPTION
HWAAP-B13 is an inactive unlined surface impoundment located between buildings 101-29 and 101-36 and south of Building 101-56. The impoundment measures  approximately 120 by 45 by 7 feet. The pit is eroded and partially filled with windblown sand. Two discharge pipes enter the impoundment from the west and an additional pipe enters from the south. A concrete settling tank is located southeast of the impoundment with a discharge pipe leading from the west end of the tank into the Eastend of the impoundment. Dredged soil is located on the side 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. Remedial Investigation in 1994 included water sampling from the settling tank, surface soil and hand auger sampling, and cone penetrometer soundings. Three surface soil samples, three hand auger samples and one cone penetrometer soil sample were collected and analyzed for explosives and metals. Elevated concentrations of RDX, and TNT were detected in the soil. Visible evidence of TNT stained soils in and surrounding the impoundment were noted during investigations. The site reassessed in 1999 using improved sampling and analytical techniques; no further action was required.
PROPOSED PLAN
A Closure Document was approved by NDEP on December 6, 1999.
Decision Document
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