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DRILLING AND SOIL SAMPLING PROCEDURES <br /> Soil borings were drilled using 8-inch-diameter, continuous-flight, hollow-stem augers; the <br /> monitoring well was overdrilled using 12-inch-diameter, continuous-flight, hollow-stem <br /> augers. To avoid cross-contamination, the augers were steam cleaned prior to drilling each <br /> boring. <br /> Soil samples were obtained for soil description, combustible gas testing, and laboratory <br /> analysis. Soil samples were retrieved ahead of the lead auger using a 5-foot-long continuous <br /> core sampler. Selected soil intervals were sampled using either 2-inch-diameter brass or 1.5- <br /> inch-diameter stainless-steel sample tubes; sample inserts were driven into the recovered <br /> sample at intervals selected for possible analysis. The sampler and sample tubes were <br /> washed with an Alconox solution and rinsed before each sampling event. <br /> Upon retrieval from the samplers, the sample tubes were securely sealed with Teflon <br /> sheeting and polyurethane caps. The samples were labeled with sample identification, <br /> sample depth, geologist's initials, and date of collection. The soil samples were placed in <br /> 1 an iced cooler prior to and during transport to a California-certified laboratory. <br /> The remaining soil recovered was described in accordance with the Unified Soil <br /> Classification System. For each soil type, field estimates of density/consistency, moisture, <br />` color, grading, and soil type were recorded on the boring logs. Field measurements of <br /> combustible gas in selected soil samples were also recorded and included in the soil boring <br /> logs. <br /> I <br /> I, <br /> t <br /> E <br /> t, <br /> i4r <br /> k <br />