[Home] [Master Table of Contents]

[Table of Contents]

AOC 47 RCRA Facility Investigation/Closure Report

Section 3 - Conclusions and Recommendations

3.1 - Conclusions

As described in Section 1, AOC 47 is an area identified as a possible waste disposal area due to the presence of mounds and a possible trench. These features were visually identified during investigation of a neighboring site. To investigate this possible waste management unit, a geophysical survey was conducted and three surface soil samples were collected. In addition, several soil gas samples collected during a survey of a neighboring site were actually collected within the AOC 47 boundary.

No anomalies potentially associated with waste management were identified at the site during the geophysical survey. No VOCs were detected in soil gas samples collected at or near the site, and no analytes were detected above RRS1 criteria in surface soil samples.

3.2 - Evaluation of Data Quality Objectives Attainment

Overall data quality objectives (DQOs) for the investigations at CSSA are provided in Volume 1-1 behind the RFI Addendum tab (Section 11 of the Work Plan Overview). A detailed list of DQOs for AOC 47, along with an evaluation of whether each DQO has been attained, is provided in Appendix C. As described in Section 1, the main objectives of the AOC 47 investigation are to determine if the site meets TNRCC requirements for RRS1 closure and to meet requirements of the 3008(h) Administrative Consent Order.

All data generated during the AOC 47 investigation were reviewed to confirm conformance with the AFCEE QAPP; the data verification report is included in Appendix B. All data are considered useable for site characterization purposes. Although several results are flagged with an “M”, these results are considered useable because the matrix interference is minimal and does not significantly affect the sample results.

TNRCC requirements for RRS1 closure, as well as EPA requirements for an RFI which are described in the Consent Order, have been met. No contamination was detected above RLs or background metal levels, and no evidence of subsurface waste disposal was identified.

3.3 - Recommendations

Analytical results indicate that no COPCs are present at AOC 47 at levels above RRS1 criteria and there is no evidence of waste at the site. Therefore, RRS1 closure criteria has been attained. Due to the lack of wastes or waste residues as determined by this investigation, no site restoration is considered necessary. CSSA therefore requests TNRCC approval of RRS1 closure of AOC 47.

3.4 - Certification

Partial Facility Closure Certification

Area of Concern 47

Department of the Army

Camp Stanley Storage Activity

Boerne, Texas

I certify that the above-described closure was performed under my direction, in accordance with the work plan and 30 TAC §335 Subpart S, and as described in this report, and that, to the best of my knowledge and belief, said closure has been successfully accomplished.