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t ,! <br /> rF t <br /> Mr. Harlin Knoll <br /> June 29, 1999 <br /> Page 3 <br /> .i <br /> ;I <br /> Hand Auger Soil Borings <br /> Up to four shallow soil borings will be advanced aro ind the perimeter of the former UST pit to a <br /> depth of.approximately 6-8 feet using a hand auge . The hand augered borings will be located <br /> approximately 20-30 feet from the center of the former UST pit to determine the lateral extent of soil <br /> contamination in the unsaturated zone. Proposed soil boring locations are shown on Figure 4. IM <br /> Soil samples will be collected into a brass liner utilizing a slide hammer core sampler. The sample <br /> will be immediately capped and placed in an iced cooler at a temperature of approximately��4° <br /> Centigrade. Cuttings generated through the use of the hand auger will be placed on and covered <br /> with plastic sheeting pending disposal. Borings will be backfilled to the ground surface with neat <br /> cement grout. <br /> Laboratory Analyses <br /> Soil and groundwater samples will be transported and r chain of custody protocol to a state certified <br /> analytical laboratory. <br /> Up to fifteen soil samples (three from the boring in the renter of the former USTs, two from each of the <br /> perimeter borings, and one from each of the hand augere borings)will be submitted for analysis of total <br /> petroleum hydrocarbons as gasoline (TPHg) and to al petroleum hydrocarbons as diesel (TPHd) <br /> using EPA method 8015 modified; and benzene, toluene, ethylbenzene, xylenes (BTE3), and methyl <br /> tert butyl ether (MTBE) using EPA method 8020. Selected soil samples, based upon field evidence <br /> of contamination and/or initial analytical results, will also be analyzed for gasoline oxygenate <br /> additives using EPA method 8260. Selection of soil samples for laboratory analysis will be based�on <br /> field evidence of petroleum hydrocarbon contamination such as discoloration, odors, and FID <br /> readings, as well as lithologic changes. If no evidence of contamination is noted in the field, samples <br /> from the capillary fringe and/or the bottom of the borings will be submitted for analysis. <br /> Up to five groundwater samples will also be analyzed for the constituents of concern outlined above using <br /> appropriate analytical methods. <br /> Summary Report <br /> i <br /> A technical report describing field activities, analytical results, conclusions and recommendations will be <br /> submitted to Mr. Mike Manser, San Joaquin County PHS/EHD, and the California Regional Water <br /> Quality Control Board(CRWQCB). <br /> A completed drilling permit application and associatt d fees will be submitted under separate cover <br /> upon your approval of this workplan. <br /> data/groundze/manser/wpo599.doc <br /> f <br /> t <br />