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February 13, 1988 <br /> Delta Truck Sales, Stockton, California AGS Job No. 2005-P <br /> Mobil B-61 (or equivalent) drilling rig equipped with hollow-stem <br /> augers. <br /> Earth materials encountered will be logged using relatively <br /> undisturbed samples collected during drilling. Samples will be <br /> collected at 5-foot intervals from the base of the excavation to <br /> total depth of the boring using a California-modified split spoon <br /> sampler. The sampler will, be lowered through the hollow stem of <br /> the augers and driven 18 inches into undisturbed soil with a <br /> standard 140-pound hammer. The number of blows required to drive <br /> the sampler each successive 6-inch interval will be recorded as <br /> an indication of soil consistency. Samples from each soil unit <br /> encountered will be analyzed by the same methods as samples from <br /> the excavation. <br /> The total depth of the boring will be approximately 20 feet below <br /> the static ground-water surface at the time of drilling. The <br /> well will be constructed using 4-inch inner diameter polyvinyl <br /> chloride (PVC) casing. The casing will ponsist of factory- <br /> perforated casing with 0. 020-inch-wide slots from total depth to <br /> a point approximately 10 feet above the ground-water surface. <br /> The remainder of the well will consistrof 4-inch blank PVC <br /> casing. <br /> 13 <br />