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3.2..1 Soil Boring Installation and Sampling <br /> All drilling will be performed by a drilling contractor licensed in the State of California to conduct <br /> ' such activities All drilling will be conducted under the supervision of American Geological <br /> Services personnel in accordance with the health and safety guidelines specified in the attached <br /> Health and Safety Plan (Appendix B) <br /> ' The borings will be advanced using 5-feet continuous flight hollow-stem augers During drilling <br /> the project geologist will log all drive samples and cuttings continuously as described in Section <br /> ' 3 2 of the Quality Assurance\Quahty Control Plan (Appendix A) <br /> All soil borings not completed as morutoring wells will be backfilled with a neat cement/bentonite <br /> slurry tremmied to within twelve inches of the existing grade Since the soil borings are <br /> anticipated to be installed within a field having potential agricultural uses, it is desireable to keep <br /> the grout at a depth that will not significantly interfere with future tilling or disking activities All <br /> ' boring locations will be plotted for inclusion on the site map <br /> Soil samples will be collected in a 2-inch diameter California modified split-spoon sampler at <br /> ' intervals of not more than five feet The sampler will be driven in advance of the augers to collect <br /> relatively undisturbed soil samples for possible analysis The sampler will be driven into the soil <br /> 18 inches at each selected sampling interval by allowing a 140 pound hammer to fall <br /> approximately 30 inches <br /> Split spoon samples will be collected in clean brass or stainless steel sampling tubes The ends of <br /> the tubes will be covered with Teflon tape and sealed with PVC or vinyl end caps to inhibit the <br /> escape of volatile compounds All soil samples will be labeled, chilled, and processed as described <br /> ' in Section, 3 1 of the QA\QC Plan (Appendix A) All sample information will be recorded on <br /> boring log forms or soil/sediment sample forms <br /> Soil samples collected from the split spoon sampler will be screened by the site geologist using a <br /> headspace analysis technique One brass sleeve will be extruded into a clean plastic zip lock-type <br /> bag A photoiomzation detector (PID) will be used to analyze the headspace of the samples <br /> t Each headspace reading will be entered on the appropriate boring log The results of this <br /> screening will be used for selection of one representative sample from each soil boring for <br /> laboratory analysis <br /> ' All soil samples will be described in the field by the site geologist Field observations noting <br /> sediment type, color, grain size, sorting, hardness, texture, clay content, moisture content, visible <br /> ' evidence of contamination, odor, or any other information important to the investigation will be <br /> recorded in the field on appropriate log forms by the site geologist <br /> ' One soil sample will be submitted from each boring for analysis under chain-of-custody <br /> procedures The sample from each boring will be the sample with the highest headspace reading <br /> using the methodology described above If headspace testing does not yield the presence of <br /> volatile organic compounds, the sample for analysis will be selected by the site geologist Soil <br /> samples will be submitted for laboratory analysis as described in Section 3 2 3 <br /> American Geological Services,Inc. <br /> CA95DE-029 <br /> 8 <br />