Laserfiche WebLink
i^ <br /> i <br /> July 8, 1988 AGS Job No. 38032-2 <br /> UNOCAL Service Station No. 6981, Stockton, California <br /> improves the efficiency and cost-effectiveness of the <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 to define the extent of contamination. The <br /> probe will provide information that will allow these wells to be <br /> installed at optimal 1-.cations for cost-effective delineation. <br /> Soil Borin s and Sam lin <br /> The soil borings will be drilled using 8- to 10-inch-diameter, <br /> continuous-flight, hollow-stem angers and a Mobile H-61 (or <br /> t <br /> similar) drill rig. The auger flights will be steam-cleaned <br /> prior to use to minimize the possibility of downhole or crosshole <br /> contamination. The drilling will be performed under the <br /> `v observation of a field geologist, and the earth materials in the <br /> boring will be logged as drilled using the Unified Soil <br /> Classification System. <br /> During drilling, soil samples will be collected at 5-foot <br /> intervals using a California-modified split-spoon sampler <br /> :J <br /> �' "p'01err Geosystems <br />