Previous Investigations:  None.  Previous investigation was inadvertently conducted at neighboring AOC 44.  Geophysical survey of SWMU B-9 will be conducted under the DO 5068 project, and a soil boring will be drilled and sampled with the RL53 project.

Planned Rework:  Replace previous analytical chemistry data generated by ITS Laboratory.  To accomplish this, complete two soil borings and obtain three samples from each soil boring.

Rationale for Analytical Program:  Based on prior usage at the site as a miscellaneous solid waste (metal debris) disposal area, chemicals of potential concern include VOCs, SVOCs, explosives, and metals.  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 since waste burning may have occurred at this site.

Resampling Activities:  The following field activities will be performed to gather data for TNRCC closure submittal of SWMU B-9:

1. Field map SWMU as described in Section 2.4.1 of the Work Plan Overview.

2. Complete two soil borings at locations to be determined after field mapping.  The borings will be approximately 20 feet deep, and three samples will be collected from each boring.  Samples will be collected at depths of approximately 1.5 feet, 10 feet, and 20 feet, unless field instruments indicate VOCs are present.  If VOCs are found to be present, then the subsurface soil sample from that interval will be submitted to the laboratory for analysis.  Each sample will be analyzed for VOCs, SVOCs, explosives, and metals.  QA/QC samples will be collected as described in Section 2.4 of the FSP.

3. Water is not expected to be encountered at the site.  However, if water is discovered in the soil boring, 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.

4. Handle the IDW in accordance with the FSP.

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

6. 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.

Historical Analytical Program and Rework Sampling Plan (Highlighted in Bold)

TBD = To be determined.