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7-I1/Stockton 6 <br /> June 1989 <br /> WORK STEPS <br /> The following work steps are proposed to further define the <br /> extent of the dissolved hydrocarbon plume: <br /> 0 Obtain the required permits from the San Joaquin County <br /> Local Health District for drilling soil borings and <br /> constructing monitoring wells. <br /> o Drill two soil borings to approximately 60-feet below <br /> grade and complete as 2-.inch-diameter monitoring :ells. <br /> Monitoring wells will be constructed as follows: <br /> Boreholes will be drilled using a truck-mounted, <br /> 10.5-inch-diameter, hollow-stem auger drill rig fol- <br /> lowing GTI's Standard Operating Procedures (SOPS) <br /> (Appendix A) , and continuous cores will be collected to <br /> obtain an accurate subsurface profile. The <br /> borings will be drilled approximately 15-feet ,helow <br /> the water table for the individual monitoring wells. <br /> �- Based on data from the existing wells, the depth-to- <br /> water is expected to be approximately 45-feet below the <br /> ground surface. <br /> In order to ',aaintain sample integrity dur_ng drilling, <br /> samples for laboratory analyses will be collected with <br /> a split-spoon sampler at 5-foot intervals to be field <br /> screened for volatile hydrocarbon concentrations using <br /> a po;.table photo-ionization detector (PID) . Samples <br /> will be collected in 2-inch-diasreter by 6-inch-long <br /> brass sample tubes. Sample tubes will be wrapped in <br /> aluminum foil, capped, taped, labeled, and stored on <br /> TECHNOLOG1.INk <br />