Known: One anomaly potentially associated with waste management practices and one anomaly associated with a pile of concrete slabs were observed during geophysical survey activities on 11 March 1996, and 2 and 3 April 1996.

Previous Investigations: Three surface soil samples were collected on 12 March 1996 and analyzed for VOCs, SVOCs, and metals. Surface soil samples are defined as samples collected at depths less than 2 feet BGL. Three soil borings were completed and six subsurface soil samples and one additional surface soil sample were collected (two subsurface samples from each boring, and one surface soil sample from SB1) on 29 August 1996. These soil samples were analyzed for VOCs, SVOCs, and metals.

Planned Rework: Replace previous analytical chemistry data generated by ITS Laboratory. To accomplish this, complete three additional soil borings in the approximate locations of the first set of soil borings, and collect one surface soil sample from each location, and two subsurface soil samples from each of the borings RW-B30-SB1, RW-B30-SB2 and RW-B30-SB3. Analyze samples for VOCs, SVOCs, and metals.

Rationale for Analytical Program: Based on prior usage at the site as an area for disposal of miscellaneous construction debris, chemicals of potential concern include VOCs, SVOCs, and metals. Metals (arsenic, barium, cadmium, chromium, copper, lead, mercury, nickel and zinc) are included due to the metallic nature of the waste. 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. Explosives are not included in the analysis due to the nature of the debris (concrete slabs, roofing shingles, etc.).

Resampling Activities: The following field activities will be performed to gather data for TNRCC closure submittal of SWMU B-30:

1. The boring logs from the original drilling of SB1, SB2, and SB3 will be copied and reviewed by the supervising geologist prior to beginning any rework at SWMU B-30. In particular, the geologist will review the PID readings and recovery volumes obtained from the existing borings.

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

3. Complete three soil borings in the approximate locations of the first set of soil borings, completed in 1996. Collect samples from the surface and from the same depth intervals as the previous work, 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= 13 feet, SB2 = 8 feet, and SB3 = 10 feet BGL). Each rework sample will be analyzed for VOCs, SVOCs, and metals as indicated in the table below. The additional surface sample that was taken during drilling efforts for SB1 will not be gathered as it was an unplanned duplicate of the surface sample previously collected during field effort 1. 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, AFCEE and CSSA will be notified 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.