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HWAAP-I23
OLD BOMB/ROCKET METAL LANDFILL
SITE DESCRIPTION
This site is an abandoned disposal site that covers about 15 acres. There is no written history on this site but interviews with Hawthorne Army Depot (HWAD) personnel indicate that this was a dumping ground for metal debris around World War II. A 1989 investigation was completed by International Technology Corporation and included geophysical surveying, installing and sampling two ground water monitoring wells, four test pits, and soil sampling. The two wells are located down gradient of I23 and the depth to ground in this area is approximately 96 ft below ground surface. No explosives were detected in the groundwater, but arsenic was detected at a concentration ranging from 0.002 to 0.02 ug/l. Elevated levels of metals were detected in the soils. Airborne ground penetrating radar surveying at nine targets spanning an area of 26 acres was conducted in 1994. Long term monitoring started in 1997 and will continue.
PROPOSED PLAN
All ranges, which include some disposal areas at the Hawthorne Army Depot, were originally included in the Installation Restoration Program (IRP), but no progress on restoration could be made because of the dangers of UXO and inaccessibility to the sites. These sites have now undergone review under the U.S. Army Active/Inactive Range Inventory. Under the Phase II Range Inventory, ranges associated with Old Bomb, Walker Lake Test Range and the NIOTC Range have been determined to be active ranges. Corrective action is required by RCRA permit. NDEP considers this site an uncharacterized site that will be addressed by the U.S. Army when the active range is closed/transferred/transferring. HWAAP-I23 has been incorporated into the Military Munitions Response Program (MMRP). Corrective action requirements at this site will be assessed in five year reviews (next review in FY08) based on groundwater results and change in range status.
Groundwater monitoring for pesticides, volatile organic compounds, and explosives will continue in accordance with the approved base-wide groundwater monitoring plan. There are three wells that cover the eleven Old Bomb sites -- HWAAP-A06B, -A06C, -A06D, -A06E, -C04, -C05, -G01B, -G01C, -I22, -I23, and -K07. Over the years, the monitoring frequency has been reduced and the analyte suite has been refined. No detects have ever been found.
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