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HWAAP-A09A
AMMUNITION CAN PILES
SITE DESCRIPTION
HWAAP A09A is a storage area of 113 piles of empty, crushed ammunition cans and 12 piles of soil/debris located west of the 100 production area and 2 miles  south of the southern shore of Walker Lake. The waste piles are approximately 6 to 10 feet high and 12 to 25 feet in diameter and are estimated to range from 15 to 65 cubic yards in volume. The empty cans were dumped on open ground and then separated magnetically, crushed, and stacked into piles. The cans were not flashed to remove explosive residues and still may contain reactive powder residues. Ground water at this site is reported to be between 70 and 78 feet bgs with a northerly gradient. Remedial investigations completed at the site in 1994 included visual characterization of the contents of the piles and collection of surface and hand auger soil sampling. Eighteen surface soil samples and eighteen hand auger samples were collected from around six of the piles for metals & explosives analyses. Low concentration of explosives and metals (lead of 230 mg/kg) were detected. The investigation indicated that a release of low magnitude had occurred. Although the lead concentration of 160 mg/kg is above the NDEP criteria of 100 mg/k, it is well below other accepted standards including the EPA Region IX P.G. The piles were inspected for ordnance and placed into a permitted landfill in 1997.
PROPOSED PLAN
A Closure Decision Document was approved by the NDEP in August 2000.
Decision Document
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