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HWAAP-A06B
OLD BOMB DISPOSAL AREA 2
SITE DESCRIPTION
This landfill area that covers about 2 acres is located one mile southwest of Rocket Mountain. Operations began in 1944, and disposal activities ceased prior to 1986.  Disposal of ordnance and hundreds of drums of unknown material occurred in the landfill. A 1987 U.S. Army Environmental Hygiene Agency report indicates that the disposed waste included ammunition-related explosives chemical (e.g., ammonium picrate, 1,3,5-Trinitro-1,3,5-Triazacychlohexane [RDX]) and unexploded ordnance (UXO). A 1989 investigation conducted by International Technology Corporation included geophysical surveying, five test pits, and soil sampling. Elevated levels of explosives (TNT 96 mg/kg), metals, and picric acid (62 mg/kg) were found, along with geophysical anomalies. In 1994, an airborne ground penetrating radar surveying was completed. The entire site was surveyed with multiple targets identified in the western and northwestern trenches. In 1994, an Army evaluation team visited the site to determine if the UXO at the site posed an imminent hazard. As a result of the evaluation, an imminent threat to human safety was determined to exist. Long-term monitoring for the Old Bomb Area started in 1997.
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-A06B 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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