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SWMU B-1 RCRA Facility Investigation/Closure Report
Section 3 - Conclusions and Recommendations
SWMU B-1 is a medium priority site, which was reportedly an area where powder and incendiary materials were burned in 1954, and there are no known records regarding site use. The site is located in the north pasture, and has an area of approximately 3 acres. An EM geophysical survey was conducted at the site in February 1995, during which no geophysical anomalies were identified. Three soil borings were drilled to a depth of 30 feet below ground level in February 1995; samples were analyzed for VOCs, SVOCs, and metals. Background metals levels were statistically calculated for both soils and bedrock and are reported in Second Revision to the Evaluation of Background Metals Concentrations in Soils and Bedrock at CSSA (Parsons, 2002). No metals were detected above background levels; however, the detection limit for cadmium was greater than the background level for cadmium. The only contaminants exceeding RRS1 criteria were phthalate compounds, which were detected at various depths in each of the three borings. No contaminants of concern were found above MCLs in a groundwater sample collected from B1-SB3 at a depth of approximately 30 feet. A small amount of water was observed in B1-SB2, but it was of insufficient volume to sample.
In March and April 2000, three additional soil borings were drilled to depths of 22.5 to 38 feet below ground level; samples were analyzed for phthalates only to determine if these contaminants occur at the site, or if they were associated with laboratory contamination. No analytes were detected above RLs; therefore, RRS1 criteria have been met at SWMU B-1. No phthalates were detected in either of two grab groundwater samples collected in April 2000.
3.2 - Evaluation of Data Quality Objectives Attainment
All data generated during the SWMU B-1 investigation were reviewed to confirm conformance with the AFCEE QAPP; the data verification reports are included in Appendix C. All data are considered useable for site characterization purposes. Because there is no waste or waste residue at the site, requirements for RRS1 closure have been met. Requirements of the 3008(h) Administrative Consent Order have been met, as detailed in Appendix D.
Overall data quality objectives (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 B-1, along with an evaluation of whether each DQO has been attained, is provided in Appendix D. As described in Section 1, the main objectives of the B-1 investigation are to determine if the site meets TNRCC requirements for RRS1 closure and to meet requirements of the 3008(h) Administrative Consent Order.
Site closure is recommended for SWMU B-1, because RRS1 closure standards were met for surface and subsurface soil samples, and site history and previous investigations do not suggest any below-surface contamination. Phthalates detected in 1995 are suspected of being associated with laboratory contamination, and results of sampling conducted in 2000 confirm this since phthalates were not reported above the RL in samples collected SWMU B-1.
Partial Facility Closure Certification
Solid Waste Management Unit B-1
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.
Jason D. Shirley
July 19, 2002
LTC Jason D. Shirley
Commander, Camp Stanley Storage Activity
Date
Kirk W. Lawson
July 17, 2002
Kirk W. Lawson, P.E.
State of Texas #79204
Parsons
Date