[Home] [Master Table of Contents]

[Table of Contents]

Final AOC 61-RCRA Facility Investigation/Closure Report

Section 3 - Conclusions and Recommendations

3.1 - Conclusions

The only evidence indicating AOC 61 as a possible historic waste management site is the existence of disturbed area in a 1966 aerial photograph. There is no evidence of waste at the surface. A geophysical survey, that included EM and GPR surveys, was conducted in July and August of 1999 in an effort to identify areas where buried waste may be located. 

The geophysical survey revealed no anomalies indicative of past waste management practices. A surface soil sampling event was conducted in January of 2000 to determine if surface soils were contaminated. Three surface soil samples were analyzed for VOCs, SVOCs, and metals. None of the surface soil samples contained contaminant concentrations that exceeded RRS1 values. 

3.2 - Evaluation of Data Quality Objectives Attainment

All data generated during the AOC 61 investigation were reviewed to confirm conformance with the AFCEE QAPP; the data verification report are included in Appendix C. 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. Results for one analyte, 3,3’-dichlorobenzidine, were flagged with “R”. This compound is not a constituent of concern at the site. Despite non-compliance of the percent difference for the continuing calibration, all of the initial calibration, second source verification and internal standard criteria were within quality control limits, as described in the data verification report (Appendix B). AFCEE approved the data package containing AOC 61 data on June 22, 2000.

Overall DQOs for the investigations at CSSA are provided in Section 11 of the Work Plan Overview (Volume 1-1, RFI Addendum). A detailed list of DQOs for AOC 61, 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 61 investigation are to determine if the site meets TNRCC requirements for RRS1 closure and to meet requirements of the consent order.

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 above RRS1 soil/rock concentrations at AOC 61 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 site assessment and prior investigative work, no site restoration is considered necessary. CSSA therefore requests TNRCC approval of closure for AOC 61 under RRS1.

3.4 - Certification

Partial Facility Closure Certification

Area of Concern 61

Department of the Army

Camp Stanley Storage Activity

Borne, 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.