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; Y 77 <br /> June 1, 1968 AGS Job No, 038032-2 <br /> !fes <br /> UNOCAL Service Station No. 6981, Stockton, California <br /> This procedure can be repeated at multiple depth points at each <br /> sampling probe hole location. <br /> Sampling locations are located in an appropriate grid pattern on <br /> the surface with appropriate spacings that allow data to be <br /> reasonably interpreted. Alternatively they are selectively <br /> located based on available information relating to plume <br /> migration. initial samples are generally collected at the <br /> r"3 <br /> perimeter of the property; subsequent locations are chosen based <br /> on the results of earlier sample analyses. Analytical results <br /> are evaluated at the time of collection with computer assistance <br /> II to allow field interpretation and decisions for locating <br /> 4' subsequent sampling points. This real time analytical procedure <br /> significantly improves efficiency and cost effectiveness of the <br /> 44 <br /> investigation. An automatic level is used to survey probe hole <br /> locations relative to an arbitrary survey station and other <br /> facilities at the site. <br /> Information from the vapor survey will be used to locate wells <br /> that are recommended for the definition of the extent of <br /> contamination. The probe will provide information which will <br /> allow these wells to be located in optimal locations for cost- <br /> effective delineation. <br />