|
HWAAP-B05
BUILDING 101-15 IMPOUNDMENT
SITE DESCRIPTION
HWAAP-B05, a double-lined surface impoundment approximately 100'x115'x15', is located within the 101 Production Group, designed to collect  explosive-contaminated wash down water from demilitarization operations. The impoundment was never used, however, the soil used to construct the impoundment was from a previous unlined impoundment used to collect explosive wash down water from 1944 to 1977. The newer lined impoundment was constructed at the same location as the older unlined impoundment. A 1989 Remedial Investigation included collecting near surface, subsurface and ground water samples from within and adjacent to the impoundment. Explosives and petroleum hydrocarbons were detected in the soil samples and explosives were detected in the groundwater at levels up to 2,000 ug/L. Additional Remedial Investigation work in 1994 included 4 surface samples collected from within the impoundment where visual staining of explosives was observed, and groundwater samples from existing wells. Concentrations of explosives were detected in these soil samples above 1200 mg/kg. Ground water samples were analyzed for explosives and found RDX concentration at 3.4 ug/L. Fifty-five feet of cone penetrometer sounding was conducted at 2 locations to assess the optimal depths to collect subsurface soil samples. The Baseline Risk Assessment was completed in 1997. The site was reevaluated in 1999 and no further action is required (an IRA to remove the liner for additional sampling was completed).
PROPOSED PLAN
A Closure Document was approved by NDEP on November 22, 1999. LTM is being funded under B12.
Decision Document
 Previous Site Summary  Next Site Summary
IRP Home Page
Table of Contents -- IRP Site Summaries
NDEP - Site Map
|
