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' Site Background Information COUNTRY CLUB FOOD & FUEL ' 1856 Country Club Boulevard, Stockton, California ' The Country Club Food&Fuel site is located on the south side of Country Club Boulevard between Mission Road and Buena Vista Avenue, in an area of low topographic relief at an elevation between ' 5 and 10 feet above mean sea level in the City of Stockton, California(Figure 1) The surrounding area is utilized for residential and light commercial purposes ' The Country Club Food&Fuel facility operates as a gasoline dispensing station and mini-market, currently, one 12,000-gallon gasoline USTs is utilized at the site as part of business operations ' REGIONAL GEOLOGIC/HYDROLOGIC SETTING The property is situated within the Great Valley Geomorphic Province of California, a large, elongate, north-northwest trending, asymmetric structural trough The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent, 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 Rocks composing the basement complex of the province have not been completely defined but are believed to be metamorphic and igneous in origin The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively Based on the 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 1 Jackson-Hallenbeck-Stockton (JHS) association The JHS soils are located within basins, and generally consist of moderate to poorly drained fine textured soils The soils are generally derived from both marine and non-marine sediment, and are generally formed in alluvium derived from mixed rock sources The Modesto,Riverbank,Turlock Lake Formations and overlying recent alluvium are the principal 1 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 the Smith Canal located approximately 1,000 feet south of the site Based on review of the Lanes of Equal Depth to Groundwater Fall 1998 map published by the San Joaquin County Flood Control District and Water Conservation District(FCD&WCD),the estimated depth to ground water at the site is between 10 and 20 feet below surface grade(bsg) Review of the ' map Lanes of Equal Elevation of Groundwater Fall 1997(FCD&WCD)depicts the regional ground water flow direction to be towards the northeast Advanced GeoEnvironmental,Inc 1