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(YA <br /> Proposed soil gas boring locations are shown on Figure 2. <br /> UST Soil Sample Collection <br /> There is one 14,960 gallon UST near the southwest corner of the main building which was <br /> originally installed in 1980 to supply fuel to the facility's backup emergency generator. The UST <br /> was filled with 16 cubic yards of pea gravel by Cen-Cal Services Inc. of Manteca, California. To <br /> assess subsurface conditions beneath the tank, ATC will employ a direct push drill rig and <br /> advance one angled soil boring beneath each end of the tank to a depth of approximately 15 feet <br /> below ground surface (bgs). Soil samples will be collected every 5 linear feet and field screened <br /> with a portable Photoionization Detection (PID)meter for the presence of volatile organic vapors. <br /> Based on field observations, (i.e. soil discoloration, PID measurements, obvious odor) one soil <br /> sample from each boring will be submitted to a State-certified laboratory for the analysis of <br /> benzene, toluene, ethylbenzene, xylenes (BTEX), total petroleum hydrocarbons as gasoline <br /> (TPHg) and TPH as diesel (TPHd) utilizing EPA Methods 8015M and 8020. <br /> Following sample collection, each open bore hole will be grouted to the surface with neat cement. <br /> The proposed boring locations are shown on Figure 2. <br /> Surface Stain Assessment <br /> ATC will employ a direct push drill rig and advance three shallow soil borings in the immediate <br /> vicinity of the oil surface in order to evaluate potential soil impaction beneath the surface stain. It <br /> is anticipated the soil borings will be limited to a depth of four feet bgs or less. A PID meter will <br /> be used to monitor the presence of volatile organic vapors. <br /> Based on field observations, (i.e. soil discoloration, PID measurements, obvious odor) one soil <br /> sample per soil boring will be submitted to a State-certified laboratory for the analysis of total oil <br /> and grease (TOG) and PCBs utilizing EPA Methods 5520 and 8080, receptively. <br /> Following sample collection, each open bore hole will be grouted to the surface with neat cement. <br /> The proposed boring locations are shown on Figure 2. <br /> Report Preparation <br /> Following the completion of field activities and the receipt of laboratory results, a report <br /> summarizing the findings of the work performed. <br /> W:\16962\REP0RTS\W0RK_PLN.DOC 6 <br />