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islands, and four newly installed, double-wall 10,000-gallon fiberglass USTs located in the same <br /> area as the removed tanks <br /> 3.0 GEOLOGY AND HYDROGEOLOGY <br /> ' The Site is located near the southern edge of the San Joaquin River delta The soils in the <br /> vicinity of the Site have been mapped as Recent alluvial fan deposits and Pleistocene nonmanne <br /> ' sedimentary deposits (Rogers, 1966) <br /> ' Native soils encountered in excavations completed at the Site during tank replacement activities <br /> ' and in soil bonngs previously drilled at the Site consisted predominantly of clay and silt to a <br /> depth of 14 ft. below ground surface (bgs) Ground water was encountered at a depth of about <br /> ' 10 ft. bgs in the tank cavity excavation on July 21, 1993. <br /> 4.0 TANK EXCAVATION, REMOVAL AND SAMPLING <br /> This section describes the following activities <br /> ' tank removal, <br /> • soil sampling at the limas of the former tank cavity, <br /> ' soil sampling below removed product lines, <br /> • water sampling in the tank cavity excavation, <br /> ' installation of new USTs and tank cavity wells, and <br /> • laboratory analyses <br /> A chronological summary of Site environmental activities is provided in Appendix A. <br /> 1 <br /> t <br /> 2 Doc #AISM01 17 <br /> 1 <br />