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KLEINFELDER <br /> 4 FIELD INVESTIGATION <br /> Field activities included a site visit, concrete coring, drilling and well installation, survey, <br /> well developmez., rr <br /> round water sampling, and observations of fuel tank removal. In <br /> addition,as requ- -"-d by the WLHD Quality Control Board, depth to water measurements <br /> 5 were made on hvu cccasions. <br /> The drilling activities included the drilling of four exploratory soil borings and the drilling <br /> and installation of three ground water monitoring wel.l.,_ The approximate location of the <br /> exploratory borings and ground water monitoring wells is ;horn on the Site Plan (Plate 2, <br /> Appendix A). <br /> 4.1 WATER WELL ASSMMIENT <br /> On October 4, 1989, 1(leinfelder performed a field saarch to identify water wells within a <br /> one-half mile radius. In addition, the California Department of Water Resources was <br /> contacted for information concerning existing wells. Information produced by this search is <br /> presented in the discussion section. <br /> 4.2-EXPLORATORY SOIL BORINGS <br /> The exploratory soil borings were advanced by a truck-mounted drill rig equipped with an <br /> 8 3/4-inch.':11ow-stem auger. Undisturbed soil samples were collected at various depths. <br /> Soil samples were sealed,labeled and placed into a cooled ice chest. The soil borings were <br /> drilled to d maximum of 23 feet beiz-;,the ground surface. Bore holes were grouted to the <br /> ground surface upon completion. Exploratory soil borings were drilled in accordance with <br /> our"DrM and Soil Sampling F'rGeedares"(Appendix B). <br /> The soil samples were field screened using a Foxboro flame'ionization detector (FED). <br /> Field <br /> scl e-cning consisted of headspace measurements using the FED as explained in <br /> Ll Appendix B. Sample information and headspace measurements are shown on the boring <br /> logs. The boring logs are included in Appendix A. <br /> EBMLID-001-89-001 <br /> 5 <br />