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Field Demonstration Work Plan for ESTCP Project 20020 - PIMS

Appendices

Appendix A - Summary of Previous Investigation Results

(from Parsons ES, 1995a)

Environmental investigations at the site began in January 1994. Preliminary sampling and mapping was conducted at that time to provide information for RI planning purposes. The RI was conducted in November and December 1995, after the work plan for the investigation was reviewed and approved by the TNRCC and USEPA. This section summarizes results of these two rounds of sampling activities.

Preliminary Sampling Results

In January and February 1994 prior to the RI, an investigation was conducted at B-20 to obtain data for use in determining RI needs. The first objective was to map site features, including boundaries, crater locations, and surface water features. The map resulting from this preliminary effort was used to determine RI sampling locations. No UXO was identified during preliminary mapping.

Secondly, samples were collected from areas of possible contamination to determine appropriate analytical parameters for the RI. Samples were collected from within four craters, near one soil mound, from the small pond, and from the livestock pond. A total of four surface soil samples, three surface water samples, three sediment samples, and four background samples were collected and analyzed for explosives, volatile organic compounds, semivolatile organic compounds, total metals, and pH.

No explosives were detected in any of the samples. Arsenic in three surface soil samples exceeded its medium-specific concentration for soil at industrial sites (30 TAC 335, Subchapter S, Appendix 1). Barium, cadmium, and lead in one surface water sample exceeded freshwater criteria (30 TAC 307). A detailed discussion of preliminary sampling results are presented in the B-20 closure plan (ES, 1994).

Remedial Investigation (First Phase) Results

The purposes of the first phase of the remedial investigation at the B-20 site were to determine if any UXO items remained at the site (posing an immediate threat to human health and the environment) and to determine if any chemicals had been released at the site (possibly posing a long-term danger to human health and the environment). To address the possible immediate concern, the entire site was screened for UXO items. To address the possible long-term effects, a large number of sediment, surface water, subsurface soil, and surface soil samples were collected and analyzed. This section summarizes results and conclusions of the remedial investigation of the site.

Surface Soils

Chemical Contamination

A total of 21 judgmental and 22 systematic surface soil samples each were collected at the site during the RI. Evaluation of contamination levels is based on a comparison with both RRS1 and RRS2 cleanup levels.

According to 30 TAC �335.554, which describes conditions which must be met to attain RRS1, contaminated media must be removed or decontaminated to background levels. A total of 18 of the 43 surface soil samples collected at B-20 exceeded background (Table 5 from Parsons ES, 1995a). Surface soils did not meet RRS1 criteria in the following areas:

Summary of Total Number of Surface Soil Samples Exceeding RRS1 and RRS2 - Phase I RI Of B-20 Former Open Burn/Open Detonation Area

According to 30 TAC �335.555, which describes conditions which must be met to attain RRS2, contaminated media must be removed or decontaminated to levels specified in Appendix II of 30 TAC 335 or levels calculated using the methodology described in 30 TAC 335.558. Three of the 43 surface soil samples exceeded Media Specific Concentration (MSC) listed in Appendix II of 30 TAC 335. The RI report estimated that roughly 560 cubic feet of soil (approximately 7,600 square feet to a depth of 2 feet) is contaminated above MSCs. Surface soils did not meet RRS2 criteria in the following areas:

Subsurface Soils

Chemical Contamination

Metals levels in three borings (SB2, SB9, and SB 10) exceeded both RRS1 and RRS2 criteria. Since most of these samples were collected within rock and since groundwater was not encountered during drilling of these borings, the RI report concluded that it is unlikely that these metals levels would have an adverse affect on human health or the environment. Concentrations exceeding RRS2 criteria were all collected at a depth greater than 12 feet. T he number of samples exceeding RRS1 and RRS2 criteria is listed in the table below.

Surface Water and Sediment

Since the ephemeral stream at the B‑20 site drains into Cibolo Creek, considered to be a recharge area for the Glen Rose Formation, surface water is a pathway of concern. No contaminants were detected in the natural surface water features at the site (the ephemeral stream and the small pond). However, surface water in three craters (8, 12, and 13) exceeded RRS2 criteria. There are no background data for surface water at CSSA.

Sediments at one. crater (crater 8) exceeded RRS1 metals concentrations, but did not exceed RRS2 criteria.

Summary of Total Number of Subsurface Soil Samples Exceeding RRS1 and RRS2

Appendix B - Analytical Methods Supporting Experimental Design

The analytical methods anticipated for supporting the experimental design of the PIMS field demonstration include:

Appendix C - Sampling and Analysis Plan (SAP)

CSSA and the PIMS Field Demonstration SAP

Appendix D - Analytical Methods Supporting the Sampling Plan

The analytical methods anticipated for supporting the sampling plan of the PIMS field demonstration include:

Appendix E - Quality Assurance Project Plan

Analytical QAPP for CSSA and the PIMS Field Demonstration

Construction Quality Assurance Plan (CQAP)

Appendix F - Health and Safety Plan

CSSA Health and Safety Plan

Addendum to CSSA Health and Safety Plan specifically for the PIMS work efforts

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