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HWAAP-B27B
BUILDING 103-8/10 OXIDATION DITCH
SITE DESCRIPTION
HWAAP-B27B is an unlined ditch approximately 3,000 sq. ft. used from the 1950's to the 1970's to contain discharged waste water from the operations of  cleaning ammunition and charge cans. The waste water was known to contain caustics, paint and sandblasting residues. Investigation activities completed in 1994 include 2.9 acres of ground penetrating radar to identify discharge pipes that lead from the operation building to the ditch. Eleven surface and 16 near surface soil samples were collected. Elevated concentration of metals (560 mg/kg of lead, 330 mg/kg of chromium) were detected in soil exceeded NDEP criteria, 20xTCLP. Six subsurface soil samples were collected from 5 borings. These samples contained no elevated concentrations of metals and no detected concentrations of explosives.
Mercury was lost in the building and may have been released into the trench, further sampling is in progress. Sampling in 1999 found mercury in the soil at levels above action levels. There has been no impact to the ground water from metals or explosives at this site, no remediation of the ground water is required.
Aerial Photo (black & white --96KB)
PROPOSED PLAN
Additional sampling to include sampling of discharge pipes will be conducted. The remedial action will be to excavate the hot spot areas. Additional investigation of the site will take place in FY10 and FY11.
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Aerial Photo