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SITE BACKGROUND INFORMATION <br /> LSTRONG PROPERTY <br /> 5157 West Business Loop 205,Tracy,California <br /> LThe site is located on the north side of West Business Loop 205 between B ird Road andBanta o Road, <br /> approximately three miles east of Tracy, San Joaquin County, California (Figure 1). The site is <br /> Llocated within the southeast quarter of Section 24,Township 2 South,Range 5 East,Mount Diablo <br /> Base and Meridian(Vernalis Quadrangle, 7.5-Minute USGS Topographic Series, 1991). <br /> One structure is located on the property and is presently unoccupied.It is our understanding that the <br /> site historically operated as a truck depot. <br /> LREGIONAL GEOLOGIC SETTING <br /> LAccording to Geologic Map of California(1966, California Department of Conservation Division <br /> of Mines and Geology),the site area is within the Great Valley Geomorphic Province(GVGP) of <br /> California,a large,elongate,northwest trending structural trough.The GVGP is subdivided into two <br /> Lmajor divisions designated the Sacramento and San Joaquin Valleys,which have been filled to the <br /> present elevation with thick sequences of sediment ranging in age from Jurassic to present day, <br /> creating a nearly flat-lying alluvial plain extending from the Tehachapi Mountains in the south to <br /> L the Klamath Mountains in the north. The western and eastern boundaries of this province are <br /> comprised of the California Coast Range and the Sierra Nevada,respectively. <br /> Based on General Soil Map (1992, United States Department of Agriculture Soil Conservation <br /> Service)obtained from the San Joaquin County Soil Survey,the site area is shown as being within <br /> the Capay-Stomar-Zacharias(CSZ)soil association.The CSZ soils are located on interfan basins and <br /> f on alluvial fans and stream terraces in the southwestern part of San Joaquin County. The soils <br /> #�• generally consist of moderate to well drained, fine textured soils. The CSZ soils generally formed <br /> in alluvium derived from sedimentary and mixed rock sources. <br /> L <br /> GROUND WATER DEPTH AND GRADIENT-REGIONAL <br /> LBased on information from the Lines Of Equal Elevation Of Water In Wells- Unconfined Aquifer <br /> Spring 1993, published by the California Department of Water Resources, the estimated ground <br /> water elevation at the site is approximately 50 feet above sea level. Based on an approximate <br /> elevation of 35 feet above sea level,the depth to ground water at the site is assumed to be 15 feet <br /> below surface grade(bsg). The regional ground water flow direction near the site area is generally <br /> L toward the north,although flow directions may vary locally and seasonably. <br /> LAdmwed C"oELvimitmntal,Ine. <br /> L <br />