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3 <br /> 2.4 SOIL BORINGS <br /> J. <br /> A total of three soil borings adjacent to and in the vicinity of the former UST excavation will be <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 /> approximately 50 feet bgs adjacent to the tank excavation. These borings:will be advanced to a vertical <br /> r <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'4nodified California split- <br /> spoon <br /> spoon sampler and retained for laboratory analysis. All borings advancedfduring this investigation will <br /> be destroyed using portland cement or bentonite grout mixture per PHS-EHD standards and will be <br /> permitted appropriately. lig <br /> r <br /> i! <br /> 2.5 SOIL SCREENING <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 /> I� i <br /> used to select soil samples for laboratory analyses. The PID or FID will also be used to monitor ambient <br /> i� <br /> air for hydrocarbon odors in the work zone during drilling activities. <br /> iz <br /> 2.6 SOIL SAMPLING <br /> I€ <br /> I <br /> Thirty soil samples will be collected from the soil borings during drilling activities. The samples will be <br /> j <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 /> I <br /> number,date and time collected, sampler's name, and type of laboratory analysis. The samples will be <br /> �# f <br /> placed in an ice chest which will be maintained at a temperature of 4° Celsius for delivery to a analytical <br /> !1 <br /> laboratory. Upon completion of each boring,the holes will be backfilled lo approximately 1 foot bgs <br /> !I �! <br /> with bentonite grout or hydrated bentonite chips. The top of each backfilled boring will be returned to its <br /> original condition. <br /> 3 jl! <br />