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HWAAP-A06E
OLD BOMB DISPOSAL AREA 5
SITE DESCRIPTION
This waste pile and treatment site measures about 850 feet x 100 feet and is located immediately east of Old Bomb Disposal Area No. 4. Three 150-ft x 30-ft x 20-ft trenches  are located in the center of this site. Operations began in 1940; it is not known when operations ceased. A 1987 U. S. Army Environmental Hygiene Agency report indicates that many tons of ordnance were burned and/or buried at this site. Explosive staining and exposed ordnance have been observed. A 1989 investigation conducted by International Technology Corporation included geophysical surveying, four test pits, and soil sampling. Elevated levels of metals as well as geophysical anomalies were found. In 1994, an airborne ground penetrating radar survey was completed over the entire site at several targets. An Army evaluation team visited the site, and determined that unexploded ordnance (UXO) at the site poses 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-A06E 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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