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Site Background Informati on COUNTRY CLUB FOOD & FUEL 1856 Country Club Boulevard, Stockton, California ' The site is located on the south side of Country Club Boulevard between Mission Road and Buena Vista Avenue in the city of Stockton, California(Figure 1) Situated in an area of low topographic relief, the site is at an elevation between 5 and 10 feet above mean sea level The surrounding area 1 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 underground storage tank(UST)is utilized at the site as a part of business operations 1 REGIONAL GEOLOGICMYDROLOGIC 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-lymg alluvial plain that extends 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 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 mixed-rock sources The Modesto, Riverbank, and 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 the Smith Canal, located approximately 1,000 feet south of the site Based on a review of the map Lanes ofEqual Depth to Groundwater Fall 1998,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) The map Lanes ofEqual Elevation of Groundwater Fall 1997(FCD&WCD)depicts the regional ground water flow direction to be toward the northeast Advanced GeoEnvironmental,Inc