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File No 93342-SGI Page 4 <br /> 2.0 WORKPLAN <br /> The followingis the workplan for soil and groundwater investigation at the site <br /> P g g <br /> 2.1 FIELD INVESTIGATION <br /> A RATIONAL FOR LOCATION OF THE BORINGS <br /> The location of these borings are chosen such that after they are converted to monitoring <br /> wells, one monitoring well will be at the down-gradient direction within 10 feet of the <br /> 1 previous underground storage tank cluster that were removed from the site The other <br /> borings are situated such that will provide a general condition of the soil at the vicinity of <br /> the pump-islands and the existing building at the site <br /> B BORINGS <br /> Total of five exploratory borings will be drilled at the site and at the locations shown in <br /> Figure 2 These borings will be drilled to the depth of 20 feet below the existing ground <br /> surface The borings will be advanced with a truck mounted drill rig utilizing an eight-inch <br /> diameter hollow stem auger Soil samples will be extracted as the borings progressed by <br /> driving a modified california split spoon sampler into the ground A 140 pound hammer <br /> with a free fall of 30 inches was utilized to drive the sampler into the ground Samples were <br /> retained with brass liners inside the split spoon sampler and were collected at five feet <br /> intervals, starting at five feet below the existing ground surface A soil filled liner from each <br /> sampled interval was removed from the spoon,wrapped in foil, sealed with plastic caps, then <br /> placed on ice for transport (under chain-of-custody documentation) to a certified laboratory <br /> Prior to drilling, all drilling equipment was steam cleaned and all brass liners and sampling <br /> equipment was thoroughly washed in Alconox solution and rinsed with deionized water to <br /> minimize the contamination of the borings Drill cuttings are stockpiled at the site and are <br /> covered by plastic This material shall be properly disposed of by the owner within 90 days <br /> of this investigation, utilizing a licensed Hazardous Waste hauler, or disposed at the site <br /> based on the results of the laboratory analysis <br /> ADVANCE SOIL TECHNOLOGY, INC <br />