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AOC 41 No Further Action Report

Section 2 - Conclusions and Recommendations

2.1 - Conclusions

Waste disposal activities are known to have occurred at SWMU B‑8, but none are known to have occurred in the reduced AOC‑41 boundary. Soil gas data collected at this site suggest that the site does not contain a source of VOC contamination.

May 1995 geophysical investigations at the former AOC‑41 revealed three anomalies that were later determined to be within the revised SWMU B‑8 boundary. The May/June 2003 geophysical survey identified five small anomalies within the reduced AOC-41 area. These anomalies were caused by items indicative of very minimal past site use, but not any waste disposal or spills.

The reduced acreage AOC‑41 does not have a source of VOC contamination, as determined from the soil gas survey. Additionally, the five geophysical anomalies that were found within the reduced acreage AOC‑41 during the 2003 geophysical survey have been removed.

2.2 - 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‑41, along with an evaluation of whether each DQO has been attained, is provided in Appendix A. As described in Section 1, the main objectives of the AOC‑41 investigation are to determine if the site meets TCEQ requirements for NFA and the requirements of the 3008(h) Administrative Consent Order.

2.3 - Recommendations

Because there are no wastes or waste residues remaining at AOC‑41, compound-specific analytical data is not necessary. Based on the requirements for NFA closure, presented in Section 1.1, it is recommended that the site be granted NFA closure.

Parsons