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HWAAP-A06D
OLD BOMB DISPOSAL AREA 4
SITE DESCRIPTION
This landfill and waste treatment site is located one half mile southeast of Rocket Mountain and covers about 300 square feet with two partially  filled trenches flanking the east and west sides. Operations began in 1944; it is not known when operations ceased. A 1987 U.S. Army Environmental Hygiene Agency report indicates that disposal of waste water containing explosives occurred in addition to disposal and burning of pyrotechnic, explosives, propellants and ordnance. Explosives staining in trenches was also observed. A 1989 investigation conducted by International Technology Corporation included geophysical surveying, excavation of seven test pits, and soil sampling. Elevated levels of explosives (TNT 130,000 mg/kg), metals, and picric acid (3,300 mg/kg) in soil, along with geophysical anomalies were found. In 1994, an airborne ground penetrating radar survey was completed over the entire site at several target locations. An Army evaluation team visited the site, and determined that unexploded ordnance (UXO) poses an imminent hazard. Long term groundwater 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-A06D 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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