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I05 May 1997 AGE-NC Project No 95-0173 Page 3 of 29 I 23 REGIONAL GEOLOGICAL/HYDROGEOLOGICAL SETTING The property is situated within the Great Valley Geomorphic Province of California, a large, elongate, 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 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 t� 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 Vallee 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 Calaveras River, approximately 3,000 feet north of the ' property Based on review of the map titled Lines of Equal Depth to Groundwater Spring 1996 published by ' the San Joaquin County Flood Control District and Water Conservation Distiict (FCD&WCD), the estimated depth to ground water at the site is between 40 and 50 feet bsg, review of Lines of Equal Elevation of Groundwater Spring 1996 (FCD&WCD) depicts the regional ground water flow direction towards the northeast However, review of recent ground water monitoring well data collected at the site suggests ground water depths are closer to 30 feet bsg with a northeast ground water flow direction Review of previous ground water monitoring at the site and historical depth to ground writer maps (FCD&. CDC datinb hack to 1971 su—ests that ground water dep1b near the site has fluctuated between 30 and 70 feet bsg Ground water is considered to be of beneficial use and is used for domestic, industrial and commercial purposes ' 2 4 DOMESTIC AND MUNICIPAL WELL SURVEY Drinking water near the site is currently supplied by the City of Stockton municipal well system The Athanced GeoEm ironmental,Inc