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r <br /> Pacific Gas & Electric Company Page 4 <br /> Stockton Service Center <br /> FStockton , California <br /> Fstorage tank and associated piping were removed . Please refer to <br /> Drawing No . 3 for the proposed test boring locations . The <br /> maximum depth of sampling will be 25 feet . Based on semi-annual <br /> groundwater reports prepared for the San Joaquin County Flood <br /> Control and Water Conservation District , groundwater in the area <br /> of the project site should be located at a depth of approximately <br /> 40 to 50 feet below site grade . Based on the anticipated depth <br /> �[ of groundwater in the area of the project site , the deepest test <br /> 1 boring proposed for this investigation would be terminated <br /> approximately 20 feet above the groundwater bearing strata . <br /> The test borings will be advanced with a Mobile drill rig <br /> using an 8 inch diameter hollow auger to achieve the desired <br /> depths . A representative soil sample will be obtained from the <br /> bore hole using a split -barrel ring sampler equipped with pre- <br /> I <br /> cleaned brass tube-s . The sampler will be driven or hydraulically <br /> I <br /> pushed approximately 18 inches into the soil . The lower 6-inch <br /> F portion of each sample will be retained for laboratory testing . <br /> g <br /> Each soil sample will be retained in the brass tube and ; <br /> r <br /> banded and sealed with chain-of-custody seals . After all soil <br /> samples have been retrieved , the test borings will be backfilled <br /> with a bentonite slurry . The soil cuttings generated by the <br /> drilling operations will be stockpiled at the project site . <br /> All samples obtained from the site for laboratory analyses <br /> will be cooled to 40C for shipment to the laboratory . Strict <br /> F: c <br /> he rzbo7ala-ua roc. <br /> >� Fresno Modesto Visalia Bakersfield <br />