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f <br /> f <br /> The tanks that were replace(] included five single-walled USTs (one 10,0()0 0,111011 tank and <br /> four 6,000 gallon tanks) present in a common tank cavity northeast of the ARCO AM/PM <br /> mini-market building (Figure 2). <br /> Currently, Site features include: <br /> 1) an ARCO AM/PM mini-market building, <br /> 2) two pump islands, and <br /> 3) four newly installed, double-walled, 10,000 gallon fiberglass USTs located in a <br /> common tank cavity on the southeast portion of the lot. <br /> The new USTs were installed into a new tank cavity located south of the former tank cavity <br /> (Figure 2). <br /> 3.9 GEOLOGY AND HYDROGEOLOGY <br /> The Site is located on the western edge of the Central Valley of California, a large trough <br /> filled with as much as ten vertical miles of marine and continental sediments. Shallow <br /> _. subsurface deposits in the valley generally consist of a heterogeneous mixture of poorly <br /> sorted clay, silt, sand, and gravel. Locally, the Site is underlain by the Plio-Pleistocene <br /> Turlock Lake Formation consisting of non-marine sedimentary deposits ranging in size from <br /> clay to gravel (Rogers, 1966). To the west of the Site, the hills of the Coast Ranges are <br /> made up of Middle to Lower Pliocene non-marine sediments. <br /> ROUX ASSOCIATES 2 Doc "R06776W.1.1 <br />