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June 1, 1988 AGS Job No. 038032-2 <br /> s" UNOCAL Service Station No. 6981, Stockton, California <br /> SOIL BORING/SAMPLING <br /> The soil borings will be drilled using 8- to 10-inch-diameter, <br /> continuous flight, hollow stem augers and a Nobile B-61, or <br /> similar, drill rig. Auger flights will be steam cleaned prior to <br /> use to minimize the possibility of downhole- or cross-hole <br /> contamination. The drilling will be performed -under the <br /> observation of a field geologist, and the earth materials in the <br /> boring will be logged as drilled using the Unified Soil <br /> Classification System. <br /> During drilling, soil samples will be collected at 5-foot <br /> inte �vals using a California-modified split-spoon sampler <br /> p equipped with I aboratory-cleaned brass sleeves. Samples will be <br /> - collected by advancing the boring to a point immediately above <br /> the sampling depth, then driving the sampler into the n, ;ive soil <br /> through the hollow center of the auger. The sampler will be <br /> driven 18 inches with a standard 140-pound hammer repeatedly <br /> dropped 30 inches. The number of blows required to drive the <br /> sampler each successive 6 inches will be counted and recorded to <br /> 60 <br /> give an indication of soil consistency. Examples of a Field <br /> Boring Lng form, Plate P-3, as well as a Boring Log Plate used in <br /> our final report, Plate P-4, are included with this report. <br /> 9 <br />