Work Plan
Table 2.5 - High Priority SWMUs
| Unit No. | Status Priority | Main Use |
Historic Use (notes from Environmental Assessment, September 1993) |
Summary of Field and Geophysical Results |
Approximate Location | Expected Field Effort 1 Activities |
| B-2 | High | B/D/Ds |
Small arms ammunition burning area used in 1954. Two trenches were observed in historical aerial photos (CSSA, 1991a) and confirmed during field study. 57mm, 128A1 ammunition canisters and fire brick/ammunition piles were also observed. |
Two trenches confirmed by field investigation; five anomalies found; geophysical/soil gas surveys conducted; borings drilled. |
Outside the security fence line in the northeastern section of facility |
None |
| B-3 | High | B |
Landfill area used primarily for garbage disposal and burning trash that was filled in 1990-91 (CSSA, 1991a). The garbage disposal was field verified. |
Two anomalies detected during geophysical survey; soil gas surveys conducted; borings drilled. |
Inner cantonment area northeast of the main compound, and near well 16 |
None |
| B-4 | High | B |
Classified burn area used to burn classified documents and trash (CSSA, 1991a). This area makes up part of a large area of no vegetation surrounding the oxidation pond. The field survey revealed additional SWMUs in the immediate vicinity. |
Six anomalies detected; therefore probable ground disturbance. Three are 10-12 ft deep by 20 ft wide at lengths of 100, 200, and 300 ft; geophysical and soil gas surveys conducted; soil borings drilled. |
Inner cantonment area northeast of the main compound, near well 16, in a large unvegetated area |
None |
| B-10 | High | D |
Ammunition disposal area. |
Needs geophysical survey. |
North of oxidation pond |
Geophysical and soil gas surveys |
| B-11 | High | D |
Miscellaneous solid waste disposal area used for disposal of ammunition, scrap metal, and construction debris. Field survey indicated miscellaneous ammunition boxes, arms packing crates, and construction debris adjacent to creek. |
Evidence of subsurface disturbance/trash on surface; geophysical survey conducted - zero anomalies |
Northwest of Building 291 |
None |
| B-15/16 | High | D, B |
Landfill for target vehicles and weapons mounts in the form of two trenches. Field survey indicated two trenches in which metal objects were visible on the surface partly covered by soil that had settled into the trenches. |
Two large trenches; three major anomalies detected during geophysical survey |
Near firing range |
Soil gas surveys |
| B-23 | High | D |
Area where a trench was observed in a 1966 aerial photo. Field survey indicated a trench filled in with soil, and two green canisters half-buried at one end of the trench. |
Trenches are obvious; a geophysical survey conducted; two anomalies found |
North Pasture |
Soil gas surveys |
| B-23A | High | D |
Area where a trench was observed in a 1994 aerial photograph. Field survey indicated a trench filled with soil and glass ampules filled with liquid. |
Geophysical survey conducted; no anomalies found. |
North Pasture |
Soil gas surveys |
| B-24 | High | B/Ds |
Area where spent ammunition and small spent rockets were observed during field survey. |
Geophysical survey conducted; three anomalies found. |
North Pasture |
None |
| Bldg 43 | High | B/Ds |
An inactive makeshift ammunition demolition facility used to burn miscellaneous solid waste and ammunition. The area adjacent to Building 43 is covered with molten metal and spent ammunition. |
No evidence of subsurface waste activities; geophysical survey needs to be conducted. |
Northeast of the oxidation pond |
Geophysical and soil gas surveys |
| DD | High | - |
Dud ammunition disposal area that is well-marked with signs, but has not been investigated. |
No access allowed to dud area. |
East of active facility areas |
None |
| I-1 | High | B/D |
Building 294 contains an inactive incinerator (built in 1943), which is currently used for storage of transformers. Interviews with CSSA personnel indicate that the incinerator was used only to burn paper and has been closed since the late 1960s. |
No evidence of subsurface waste activities; geophysical survey needs to be conducted. |
Adjacent to wastewater treatment facility |
Geophysical and soil gas surveys |
| O-1 | High | - |
An oxidation pond constructed in 1975; however, a relatively small cleared area can be seen in the aerial photo from 1973 (CSSA 3/17/92). The pond was lined with a vinyl plastic with a life expectancy of 10 years. Waste liquids and sludges were tank-collected from the bluing operation are pumped out and trucked to the evaporation pond. A sample of the top liquid and sludge was taken to Brooks AFB on 20 April 1984 for evaluation at the request of teh Texas Department of Health and tested for metals (CSSA, 1984). In 1985, the RRAD prepared a recommended procedure for closure of the evaporation pond (RRAD, 1985). The evaporation pond was filled in with dirt in the fall of 1985 (CSSA, 3/17/92). |
Boundaries delineated, roughly circular with 75-ft diameter and depth of less than 5 ft; soil gas and geophysical surveys conducted; one anomaly found; soil borings have been drilled and sampled. |
Inner cantonment area, northeast of main compound |
Treatability study |
|
B Burning or detonation D Disposal - depth unknown Ds Surficial deposition Note: SWMUs with "None" listed under Expected Field Effort Activities were not addressed in the SOW for work actions (SWMUs B-2, B-3, B-4, B-11, and B-24). They are in this table for a complete listing of identified high priority SWMUs. |
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