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Upon completing the soil borings, the boreholes were backfilled from total depth to the ground surface <br /> with a cement/5 percent bentonite grout mixture. Backfilling of the boreholes was conducted under the <br /> supervision of an inspector from the SJCPHS. <br /> 3.2 ANALYTICAL TESTING PROGRAM <br /> Soil samples collected during advancement of the borings did not exhibit elevated PID readings or other <br /> signs of hydrocarbon contamination (e.g., discoloration or odors). Soil samples selected for chemical <br /> analysis from vertical borings BH-3 and 13H-4 were from depths of 15, 25, 30, and 40 feet below ground <br /> surface (bgs). Soil samples selected for chemical analysis from slant boring BH-5 were collected from <br /> a true vertical depth of 15, 20, 25, 30, and 32 feet bgs. <br /> Soil samples were submitted to the Superior Precision Analytical Inc. (Superior)of Martinez California <br /> n1a <br /> with a completed chain-of-custody record and analyzed for TPHg and BTEX in accordance with EPA <br /> ' methods 8015 modified and 8020, respectively. <br /> 3.3 EQUIPMENT DECONTAMINATION AND WASTE CONTAINMENT PROCEDURES <br /> To minimize the potential for cross contamination between drilling and sampling locations, equipment <br /> used for drilling and soil and groundwater sampling were cleaned prior to beginning work and between <br /> ' each sampling location. Drilling equipment was cleaned using a combination steam/high pressure washer. <br /> Soil sampling equipment (e.g., spilt-barrel samplers, sample tubes, bailers) were cleaned by thoroughly <br /> washing in a tri-sodium phosphate (TSP) and water solution, followed by a potable water and distilled <br /> water rinse. <br /> Soil cuttings generated during drilling were placed on and covered with plastic sheeting. Decontamination <br /> ' fluids generated during the field activities were contained in labeled DOT-approved 55-gallon drums and <br /> stored on-site. <br /> CONFMM.Rff <br /> 50014-005-01 6 <br />