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7-11/Stockton 12 <br /> June 1989 <br /> in depth of completion to monitor discrete areas of the <br /> aquifer. The second and third borings in each well. <br /> cluster will be drilled using a 12-inch bucket auger <br /> - and casing hammer. The casing hammer will drive <br /> the steel casing as the bucket auger is advanced. The <br /> casing will prevent the bucket auger from becoming <br /> contaminated by the surrounding formation as the boring <br /> is being drilled. This will prevent lower saturated <br /> zones from becoming contaminated as the auger is <br /> employed deeper into the borehole. <br /> Based on field observations of the continuous core <br /> taken in the initial well-cluster boring, the total <br /> depth and screened intervals for the second and third <br /> borings in each well cluster will be determined. A <br /> _. 2-inch-diameter monitoring well will be completed in <br /> each of the well-cluster borings (Figure 6) . <br /> All drilling and groundwater monitoring-well <br /> installations will be conducted in accordance with the <br /> State of California and local regulations. In <br /> addition, these activities will be conducted in <br /> accordance with GTI's Standard operating Procedures <br /> (Appendix A, SOPS 11, 14 and 15) . <br /> All drill cuttings and equipment rinsate will be <br /> retained in labeled, steel, 55-gallon drums. Drill <br /> cuttings will be retained on site pending laboratory <br /> analyses for legal disposal. Disposal of drill <br /> cuttings will be conducted at a Class III landfill or <br /> by waste haul. Equipment rinsate will be settled in <br /> the 55-gallon drums and subsequently run through the <br /> operating air stripper for disposal. <br />