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I , <br /> L303 South Cherokee Lane TL A91701.01 <br /> March 10, 1995 Page 2 <br /> L <br /> L It is Twining's opinion that the above-referenced scope of work is the minimum required <br /> to meet the stated objective. This scope of work would expand in the event that PPCs are <br /> detected through the field screening process. The approach and rationale for an expanded <br /> Lscope of work are described in section 4.1. <br /> L3.0 BACKGROUND <br /> A description of the site, the geologic and hydrologic characteristics, and the project history <br /> Lare summarized in the following subsections. <br /> L3.1 Site Description <br /> The site is located at 303 South Cherokee Lane in the central eastern portion of Lodi, <br /> L 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 /> 3.2.1 Geology <br /> `. The site is located in the southern portion of the Sacramento Valley which comprises the <br /> northern segment of the larger Great Valley. The Great Valley is an asymmetrical synclinal <br /> L 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'Valley has been filled with a sequence of older to younger alluvium of Pliocene <br /> 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 /> L 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 /> L Based on field notes taken during the removal of product piping on April 22, 1994, soils <br /> encountered at the site consisted of silty sand and sandy silt in the upper five feet. <br /> L 3.2.2 JWroloa <br /> 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 /> and others, 1959). <br /> L <br /> L <br />