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1 <br />' Site Background Information <br /> i g <br />' COUNTRY CLUB FOOD & FUEL <br /> 1856 Country Club Boulevard, Stockton, California <br />' The site is located on the south side of Country Club Boulevard between Mission Road and Buena <br /> Vista Avenue in the city of Stockton, California(Figure 1) Situated in an area of low topographic <br /> relief, the site is at an elevation between 5 and 10 feet above mean sea level The surrounding area <br />' is utilized for residential and light commercial purposes <br /> The Country Club Food &Fuel facility operates as a gasoline dispensing station and mim-market, <br />' currently, one 12,000-gallon gasoline underground storage tank(UST)is utilized at the site as a part <br /> of business operations <br /> 1 <br /> REGIONAL GEOLOGIC/HYDROLOGIC SETTING <br />' The property is situated within the Great Valley Geomorphic Province of California, a large, <br /> elongate, north-northwest trending, asymmetric structural trough The Great Valley Province has <br />' been filled with thick sequences of sediment ranging in age from Jurassic to Recent,creating a nearly <br /> flat-lying alluvial plain that extends from the Tehachapi Mountains in the south to the Klamath <br /> Mountains in the north The western. and eastern boundaries of this province are comprised of the <br />' . California Coast Range and the Sierra Nevada, respectively Rocks composing the basement <br /> complex of the province have not been completely defined but are believed to be metamorphic and <br /> igneous in origin The northern and southern portions of the Great Valley Province have been <br /> designated the Sacramento and San Joaquin Valleys, respectively <br /> Based on the General Soil Map from the San Joaquin County Soil Survey, published by the United <br /> States Department of Agriculture Soil Conservation Service in 1992, the site area is within the <br /> Jackson-Hallenbeck-Stockton (JHS) association The JHS soils are located within basins, and <br /> generally consist of moderate-to poorly-drained, fine-textured soils The soils are generally derived <br />' from both marine and non-manne mixed-rock sources <br /> The Modesto, Riverbank, and Turlock Lake Formations and overlying Recent alluvium are the <br />' principal source of domestic ground water in the 13,500 square-mile San Joaquin Valley Ground <br /> Water Basin (Basin 5-22) Tlus basin is drained primarily by the San Joaquin River The nearest <br /> surface water feature in the vicinity of the property is the Smith Canal, located approximately <br />' 1,000 feet south of the site <br />' Based on a review of the map Lines ofEqual Depth to Groundwater Fall 1998,published by the San <br /> Joaquin County Flood Control District and Water Conservation District(FCD&WCD),the estimated <br /> depth to groundwater at the site is between 10 and 20 feet below surface grade(bsg) The map Lines <br />' ofEqual Elevation of Groundwater Fall 1997(FCD&WCD)depicts the regional ground water flow <br /> direction to be toward the northeast <br /> 1 <br /> Advanced GeoEnvironmentul,Inc <br />