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WALLACE•KUHL&ASSOCIATES,INC. <br /> APPENDIX <br /> FIELD PROCEDURES <br /> Soif Borings <br /> A minimum of five soil borings (P1 through P5) will be drilled and sampled using a hollow- <br /> stem auger rig to ground water or approximately 20 feet below grade. Ail soil borings will be <br /> backfilled with bentonite grout tremmied from total depth to ground surface. <br /> Soil Sampling <br /> Soil samples will be collected from each boring using a modified California sampler containing <br /> two-inch diameter, six-inch long brass tubes, cleaned with trisodium phosphate. Samples will <br /> be collected and screened in the field using an organic vapor analyzer (OVA) at a maximum <br /> of 5 foot intervals from surface to total depth. Additional samples will be collected if the OVA <br /> indicates hydrocarbons are present or if lithological boundaries are encountered. Sample tubes <br /> will be sealed with aluminum foil, plastic caps and wrapped with tape. All samples will be <br /> preserved on ice and selected samples submitted to a California certified laboratory for <br /> analysis. Laboratory analysis will consist of total petroleum hydrocarbons [(TPH), EPA methods <br /> 5030/3550 and 8015 modified], benzene, toluene, xylene, ethyl benzene [(BTX&E), EPA method <br /> 8020], and tetraethyl lead (DOHS-LUFT). Contaminated soils generated during drilling will be <br /> stored in sealed DOT 55-gallon drums for subsequent remediation or disposal. <br /> Ground Water Development, Purging and Sampling <br /> If ground water is encountered during drilling, the ground water will be sampled through <br /> hollow-stem augers after purging the augers of approximately three to five borehole volumes <br /> of ground water. This method is intended only as a preliminary indication of potential ground <br /> water contamination. Water samples will be obtained with single-usage polyethylene bailers, <br /> decanted into the appropriate containers, preserved on ice, and submitted to the laboratory <br /> for analysis of the above constituents. <br /> Pumping equipment will be cleaned prior to use with a tri-sodium phosphate cleanser to <br /> minimize the potential for cross contamination. All water removed during development and <br /> purging operations will be stored in sealed 55-gallon drums. <br />