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Clayton <br /> i CMiRI <br /> E <br /> Table 1 <br /> Sites with Documented Fuel Leaks <br /> Within a 1/2-Mile Radius of the Subject Site <br /> Distance! <br /> Site Name/Address Gradient Direction <br /> Arco Station #4493 114 mile West <br /> 205 North Center Street Upgradient <br /> Stockton, California <br /> Goodyear Tire and Rubber Company 100 feet South <br /> 130 North E1 Dorado Street Crossgradient <br /> Stockton, California <br /> Car Repair Shop 200 feet Southwest <br /> Former Shell Gas Station Crossgradient to <br /> 14! North El Dorado Street Upgradient <br /> Stockton. California <br /> The car repair shop's upgradient/crossgradient location close to the subject site raised <br /> the possibility that groundwater contamination may have migrated under the site. In <br /> the investigation of the car repair shop site, soil contamination was also noted, in a <br /> sand lens at 16.5 ft below ground surface (bgs). Clayton therefore recommended <br /> installation of a monitoring well to determine if contamination may have migrated <br /> beneath the subject site. This investigation addresses this recommendation. <br /> 3.0 FIELD PROCF13ugES <br /> Clayton supervised installation of one monitoring well at the site on April 11, 1991. <br /> Groundwater samples were collected from the monitoring well on April 22, 1991. The <br /> following subsections address the completion of each of the project tasks. <br /> 3.1 SOIL BOREHOLE INSTALLATION AND SA.N1pLING <br /> We prepared a work plan and obtained a permit for the installation of a monitoring <br /> well from the San Joaquin County Environmental Health Division. A copy of the <br /> permit is included as Appendix A. <br /> Drilling at the subject site was conducted on April 11, 1991. Spectrum Exploration, <br /> Inc. of Stockton, California, was contracted to provide borehole and well installation <br /> services under supervision of Ms. Robyn Seymour, Clayton Geologist. <br /> All work was performed in accordance with San Joaquin County regulations as well as <br /> Clayton's Drilling Well Construction and Sam ling Protocols; included as Appendix <br /> ;wl-Lrrp ' I <br />