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r <br /> 2.4 SOIL BORINGS <br /> A total of three soil borings adjacent to and in the vicinity of the former UST excavation will be <br /> Ir <br /> advanced utilizing a truck-mounted hollow-stem auger drill rig(Figure 2). One boring is anticipated to <br /> be advanced approximately 50 feet below ground surface (bgs), near the center of the original tank <br /> excavation or until organic vapor monitoring and field observations of two consecutive samples, taken at <br /> five foot intervals, indicate no contamination. Two additional borings are anticipated to be advanced <br /> i, <br /> approximately 50 feet bgs adjacent to the tank excavation. These borings'will be advanced to a vertical <br /> depth to be determined in the same manner as discussed above. A maximum of thirty soil samples will <br /> be collected from the boreholes. The samples will be collected utilizing a modified California split- <br /> jR <br /> spoon sampler and retained for laboratory analysis. All borings advanced during this investigation will <br /> be destroyed using portland cement or bentonite grout mixture per PHS-EHD standards and will be <br /> permitted appropriately. <br /> ik <br /> 2.5 SOIL SCREENING it <br /> The use of a organic photo ionization detector(PID)or flame ionization detector(FID)will be employed <br /> to pre-screen soil samples collected during soil boring advancement. The field screening will be useful <br /> in determining the vertical extent of petroleum contamination in each boring. The screening will also be <br /> used to select soil samples for laboratory analyses. The PID or FID will also be used to monitor ambient <br /> air for hydrocarbon odors in the work zone during drilling activities. <br /> 2.6 SOIL SAMPLING �. <br /> if <br /> Thirty soil samples will be collected from the soil borings during drilling activities. The samples will be <br /> collected using a modified California split-spoon sampler. Each soil sample will be contained in brass <br /> sleeve, capped with plastic end caps,and labeled with the following information: sample identification <br /> number,date and time collected, sampler's name, and type of laboratory analysis. The samples will be <br /> placed in an ice chest which will be maintained at a temperature of 4'Celsius for delivery to a analytical <br /> E laboratory. Upon completion of each boring,the holes will be backfilled to approximately i foot bgs <br /> with bentonite grout or hydrated bentonite chips. The top of each Backfilled boring will be returned to its <br /> original condition. <br /> 3 <br /> }} <br /> .L ' <br />