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SWMU Demo Dud Area (DD) Area

RL33 Work Plan Amendment for Data Quality Rework, May 2000

Soils: Brackett and Tarrant Association, rolling

Known: The demolition dud area consists of approximately 3.5 acres in the inner cantonment area of CSSA. Prior uses of the site are unknown; however, the area was posted with "Demolition Dud Area" warning signs. Investigation of the site commenced with a sweep for surface UXO. During this work, a disposal trench measuring 250 feet long and estimated to be about 2 feet deep was identified. A map of the site is included as Figure DD-1. A number of UXO items have been identified, primarily including fuses and Stokes mortars. The trench consists of waste scrap metal and UXO mixed in a soil matrix.

Previous Investigations: UXO identification work has been completed at the demolition dud area. During this work, the disposal trench was identified. A number of UXO items were identified, including primarily fuses and Stokes mortars. All metallic debris and UXO items that were not live were taken offsite for recycling as scrap metal. Within the area, approximately 600 cu. yds. of material were sifted and approximately 15,390 pounds of metal debris was removed and sent off-site for recycling. The amount of sifted soil stockpiled onsite site is approximately 300 cu. yds. After sifting was completed, three samples of sifted soil, listed in the following table, were collected and analyzed by ITS Laboratory for VOCs, explosives, and metals.

Resampling Activities: Parsons ES proposes that no rework be conducted at SWMU DD. Three samples of sifted soil were analyzed by ITS Laboratory. Since a soil pile disposition assessment is currently planned for SWMU DD under RL83, it is proposed that these ITS results be used for screening purposes. In addition, soil boring samples are scheduled to be collected, as described in the RL33 Work Plan Amendment. These data, along with results associated with the soil pile disposition assessment, should be sufficient for site characterization.

Rationale for Analytical Program: Based on prior usage at the site as an area used for the disposal of dud ammunition, chemicals of potential concern include VOCs, SVOCs, metals and explosives. Metals (arsenic, barium, cadmium, chromium, copper, lead, mercury, nickel and zinc) are included due to the metallic nature of the waste. Ammunition may include explosives residue therefore, an analysis for explosives will be conducted. VOCs analysis is included in the analytical program to detect typical contaminants associated with a disposal area. SVOCs are not included at this site since no evidence of waste burning has been found.

Historical Sampling Program