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Known: No anomalies associated with waste management practices were observed during the geophysical survey activities on 5 May 1995.

Previous Investigations: Four soil borings were completed and twelve soil samples were collected (three samples from each boring) on 30 August and 3 September 1996. These subsurface soil samples were analyzed by ITS Laboratory for VOCs, SVOCs, metals, and explosives. One surface soil sample was collected on 12 September 1996 and analyzed for VOCs, SVOCs, metals and explosives.

Planned Rework: Replace analytical chemistry data generated by ITS Laboratory. To accomplish this, complete four additional soil borings in the approximate locations of the first set of soil borings, and collect three subsurface soil samples from each boring. These samples will be called RW-B12-SB1, RW-B12-SB2, RW-B12-SB3, and RW-B12-SB4. Analyze samples for VOCs, SVOCs, metals, and explosives.

Rationale for Analytical Program: Based on prior usage at the site as a landfill area for large pieces of scrap metal and weapons, 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 included at this site since waste burning may have occurred.

Resampling Activities: The following field activities will be performed to gather data for TNRCC closure submittal of SWMU B-12:

1. The boring logs from the original drilling of SB1, SB2, SB3, and SB4 will be copied and reviewed by the supervising geologist prior to beginning any rework at SWMU B-12. In particular, the geologist will review the PID readings and recovery volumes obtained from the existing boring.

2. Field locate previous sample locations (collected in 1996).

3. Complete four soil borings in the approximate locations of the first set of soil borings, completed in 1996. Boring locations are shown in Figure B12-1. Three rework soil samples will be collected from each boring from the same depth intervals as the first set of subsurface soil samples, unless field instruments indicate that VOCs are present in the boring from a different depth. If PID readings indicate VOCs are present, then the subsurface soil sample from that interval will be submitted to the laboratory for analysis. The total depth of each boring will be at approximately the same depth as the first set of soil borings (SB1 = 10 feet, SB2 = 11 feet, SB3 = 11 feet, and SB4 = 10 feet). Each rework sample will be analyzed for VOCs, SVOCs, metals, and explosives, as indicated in the following table. Metals include arsenic, barium, cadmium, chromium, copper, lead, mercury, nickel, and zinc. QA/QC samples will be collected as described in Section 2.4 of the FSP.

4. Boring logs for the rework soil borings will not be completed. Instead, the original boring logs created from the boring completed in 1996 will be available onsite during rework activities. Changes to the boring logs will be made if field personnel observe a difference in the rework boring from the original soil boring.

5. Water is not expected to be encountered in the borings at the site. However, if water is discovered in any of the soil borings, it will be reported to AFCEE and CSSA immediately. Completion of wells is beyond the scope of this rework as no monitoring wells were previously installed at the site.

6. Handle IDW as specified in the FSP.

7. Analytical results for the data quality rework samples will be reported in the Rework ITIR.

8. If the results of the above work indicate that the site can be closed under RRS1 without any further investigation and/or remediation, a technical/closure report will be prepared and submitted in accordance with TNRCC closure requirements. If the site does not meet RRS1 closure requirements, a technical report describing the results of the investigation and recommended additional investigation and/or remediation will be prepared under the RL17 SOW.

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