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HWAAP-G01C
OLD BOMB OPEN BURN/OPEN DETONATION
GROUND 3 (D AREA)
SITE DESCRIPTION
This waste treatment site is located approximately one-half mile southeast of Rocket Mountain. The site measures about 1,000-ft x 300-ft and is divided into 10  sections separated by 10-ft soil berms. Operation began in 1940 and ended in 1970. A 1987 U.S. Army Environmental Hygiene Agency preliminary assessment report indicates that PEP (pyrotechnic, explosives and propellants) was burned at this site. There is visible staining of explosives and the site is littered with ordnance. A 1989 investigation conducted by International Technology Corporation included geophysical surveying, installation and sampling of ground water monitoring wells, two test pits, and soil sampling. Groundwater was encountered at 140 ft below ground surface. Elevated levels of explosives (TNB 110 mg/kg) were detected in the soil. No explosives were detected in the ground water. Investigation in 1994 included airborne ground penetrating radar surveying over the area. Also, an Army evaluation team visited the site to determine if the unexploded ordnance (UXO) at the site pose an imminent hazard. 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-G01C 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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