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[RFI Report]

Final SWMU B-6 RCRA Facility Investigation/Closure Report

Section 3 - Conclusions and Recommendations

3.1 - Conclusions

SWMU B-6 was identified during a records search as a site that had been used for the disposal of miscellaneous solid waste. A geophysical survey conducted on March 4, 1996, revealed no anomalies at the site.

A surface soil sampling investigation was initiated in 1996 to verify the absence or presence of VOCs, SVOCs, and metals. The analyses of the surface samples that were collected in 1996 were deemed unusable by the EPA in 1999. A rework of the soil sampling investigation was performed in March 2000 to replace the analytical data.

As described in Section 2.2.3, metals concentrations in surface soil samples were below background levels for all metals tested. The concentrations of VOCs and SVOCs in surface soil samples were all below the laboratory RLs for these compounds. No waste or debris has been observed at the site during field investigations. Therefore, the site meets RRS1 closure criteria.

3.2 - Evaluation of Data Quality Objectives Attainment

All data generated during the SWMU B-6 investigation were reviewed to confirm conformance with the AFCEE QAPP; and the data verification report are included in Appendix B. All data collected during the investigation are considered useable for site characterization purposes.

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 SWMU B-6, 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 SWMU B-6 investigation are to determine if the site meets TNRCC requirements for RRS1 closure and to meet requirements of the 3008(h) Administrative Consent Order.

Based on the geophysical and surface soil investigation, COCs do not occur at the site at levels above soil background. No waste or debris has been observed at the site. Therefore, the site meets the TNRCC RRS1 requirement for removal of all waste and is eligible for closure under RRS1.

3.3 - Recommendations

A comparison of the analytical results to RRS1 closure criteria indicated that the reported results for the three surface soil samples collected at SWMU B-6 were below RRS1 levels for all potential COCs associated with the site. Since no geophysical anomalies were identified and RRS1 closure standards were met for the surface soil samples, site closure is recommended under RRS1 for SWMU B-6.

3.4 - Certification

Partial Facility Closure Certification
Solid Waste Management Unit B-6

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.