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AOC 56 RFI Closure Report

Section 3 - Conclusions and Closure Certification

3.1 - Conclusions

RFI investigation results for AOC 56 showed the presence of buried waste and elevated metals concentrations. The RFI recommended excavation and disposal of the waste material so that the site could be closed under RRS1 criteria. Confirmation sampling was conducted after excavation/disposal/cleanup confirmation activities confirmed waste residue was removed from the site. Excavation activities were performed January through April 2004. Confirmation sampling results for metals indicated that soil concentrations were below CSSA soil background levels, and all organic concentrations were below RLs. All waste and waste residue have been removed from the site, therefore, the site has met RRS1 closure requirements.

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‑56, along with an evaluation of whether each DQO has been attained, is provided in Appendix C. As described in Section 1, the main objective of the AOC‑56 closure activities was to meet TCEQ requirements for RRS1 closure and the requirements of the 3008(h) Administrative Consent Order.

All data generated during the AOC‑56 site closure were reviewed to confirm conformance with the AFCEE QAPP; the data verification reports are included in Appendix B. All data are considered usable for site characterization purposes. Although several results are flagged with a “J”, these results are considered usable because estimation of the quantitation does not significantly affect the sample results.

3.3 - Closure Certification

Partial Facility Closure Certification

Area of Concern 56

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.