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i Site Background Information QUICK N SAVE #2 2057 South E1 Dorado Street, Stockton, California IINTRODUCTION The Quick N Save 42 site is located on the west side of South El Dorado Street and is bounded on the north by Delhi Street, in an area of low topographic relief at an elevation of approximately 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 Currently the site is being utilized as a gasoline refueling station and mim mart 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 Klammath 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 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 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 closest surface water features to the site are San Joaquin River and Walker Slough located approximately 4,500 feet southwest of the site Water from the site drains into the San Joaquin River I Deep Water Channel which is primarily used for commercial and recreational boating Based upon well information obtained from the most recent quarterly monitoring event (06104), ground water flow direction is towards the southeast and is currently occurring at a depth of approximately 30 to ' 31 feet below surface grade (bsg) Advanced GeoEnvironrnental,Inc 1