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7-Eleven/Stockton g <br /> November 1989 <br /> bottom of each boxing. one tube from each sampling interval was <br /> sealed, capped, labeled and placed on ice in an insulated cooler <br /> for delivery to GTEL Environmental Laboratories, Inc. (GTEL) , a <br /> State of California-certified laboratory in Concord, California. <br /> One brass tube sample from each sampling interval was field- <br /> screened for hydrocarbon vapors using a photo-ionization detector <br /> (PID) . The PID readings are noted on the drill logs provided in <br /> Appendix D. Based on a review of the field PID readings and <br /> drill logs, samples were selected for analyses for the presence <br /> of BTEX and TPH--as-gasoline using modified U.S. Environmental <br /> Protection Agency (EPA) Methods 5030/8020/8015. The samples <br /> submitted for analyses from the well-cluster borings included: <br /> (1) the one which exhibited the highest PID reading; (2) the one <br /> from the top of the water 'table; and (3) the last sample which <br /> ~� exhibited a PID reading as the hole was advanced. Laboratory <br /> results of the soil sample analyses are presented in Appendix E. <br /> Each baring for the well.cluster was completed as a 2-inch- <br /> diameter polyvinyl chloride (PVC) groundwater-monitoring well. <br /> The screened intervals for the two deeper borings in the cluster <br /> were selected to be 5-feet in length, in order to monitor <br /> discrete zones of the aquifer. The shallow well was screened to <br /> r <br /> 34-feet below grade, in order to monitor the upper zones of the <br /> — aquifer. The completion depths for the well cluster wells are as <br /> follows: <br /> WELL I.D. TOTAL DEPTH SCREENED INTERVAL <br /> (feet) (feet) <br /> MW-15A 75 70 - 75 <br /> MW-15B 69 64 69 <br /> — MW-15C 62 34 - 62 <br /> C� Gkil(MAOIEN <br />