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Site Background Information CHEROKEE TRUCK STOP 3535 East Cherokee Road, Stockton, California The site is located approximately 300 feet northeast of the intersection of Cherokee and Newton Road, in the eastern portion of Stockton, California (Figure 1). The site is located in the northeast quarter of Section 53, Township 2 North, Range 7 East, Mount Diablo Base and Meridian (Stockton West Quadrangle, 7.5-Minute USGS Topographic Series, 1968, photo revised 1987). REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The Geologic Map of California, published in 1966 by the California Department of Conservation Division of Mines and Geology, shows the site area within the Great Valley Syncline (GVS), a large, elongate, northwest trending structural trough. The GVS is subdivided into two major divisions designated the Sacramento and San Joaquin Valleys, which have been filled to the present elevation with thick sequences of sediment ranging in age from Jurassic to present day, creating a nearly flat-lying alluvial plain extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively. Based on General Soil Map from the San Joaquin County Soil Survey, published by the United States Department of Agriculture Soil Conservation Service in 1992, the site area is within the Guard-Devries-Rioblancho (GDR) association. The GDR soils are located within basin rims along the eastern edge of the Sacramento-San Joaquin Delta area, and generally consist of poorly drained, fine to coarse textured soils. The GDR soils generally formed in alluvium from mixed rock sources. The Modesto, Riverbank, Turlock Lake Formations and overlying recent alluvium are the principal source of domestic ground water in the 13,500-square mile San Joaquin Valley Ground Water Basin(Basin 5-22). This basin is drained primarily by the San Joaquin River. The nearest surface water feature in the vicinity of the property is Stockton Diverting Canal, located approximately 2,500 feet southwest of the site. Ground water in the area of the Cherokee Truck Stop site is considered to be of beneficial use. UNDERGROUND STORAGE TANK REMOVAL Three 500-gallon waste oil tanks were removed from the site prior to 1990. Details of the waste oil UST removals were not available to AGE. Advanced GeoEnvironmental,Inc.