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L <br /> 303 S. Cherokee Lane, Lodi, California TL A91701.01 <br /> February 7, 1995 page 2 <br /> L <br /> 3.0 BACKGROUND <br /> LA description of the site, the geologic and hydrologic characteristics, and the project history <br /> are summarized in the following subsections. <br /> L3.1 Site Descri tion <br /> L The site is located at 303 South Cherokee Lane in the central eastern portion of Lodi, <br /> California (Drawing 1). The site, formerly the Cherokee Service Center, is currently <br /> occupied by Olympic Muffler & Brake (Drawing 2). <br /> L3.2 Geologic and Hydrologic Characteristics <br /> L3.2.1 GeoloQv <br /> The site is located in the southern portion of the Sacramento Valley which comprises the <br /> Lnorthern segment of the larger Great Valley. The Great Valley is an asymmetrical synclinal <br /> trough interrupted by two major surface cross structures: the Stockton Fault in the Stockton <br /> Arch and the White Wolf Fault in and south of the Bakersfield Arch. <br /> L The Great Valle has been filled with a sequence of older to younger alluvium of Pliocene <br /> Y q Y g <br /> L to Holocene age which overlie sedimentary rocks of Cretaceous to Tertiary age. These <br /> sedimentary units, in turn, overlie a crystalline basement of Paleozoic and Mesozoic <br /> metamorphic and igneous rocks. The shallow subsurface geology in the site vicinity consists <br /> of a heterogeneous mix of gravel, sand, silt, and clay(Hackel, 1966). <br /> LBased on field notes taken during the removal of product piping on April 22 1994, soils <br /> Lencountered at the site consisted of silty sand and sandy silt in the upper five feet. <br /> 3.2.2 U-1drolo <br /> 1. Sediments containing fresh groundwater are largely unconsolidated silts and sands derived <br /> from river channel, flood plain, and alluvial fan deposits of Pliocene to Recent age (Davis <br /> Land others, 1959). <br /> First encountered groundwater in the site vicinity occurs under unconfined (water table) <br /> L conditions at a depth of approximately 60 feet BSG and flows to the south-southwest <br /> (personal communication with San Joaquin County Public Health Services/Environmental <br /> Health Division)., Local groundwater flow may be influenced by pumping of water wells and <br /> L recharge from various sources. The effect of these influences on groundwater beneath the <br /> site is beyond the scope of this investigation <br /> L <br /> L <br />