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f 15 February 2000 AGE-NC Project No 98-0448 Page 4 of 33 ' I2 4 REGIONAL GEOLOGICAIA-YDROGEOLOGICAL SETTING The property is situated wltlun the Great Valley Geomorphic Province of California, a large, I elongate, northwest trending, asymmetnc 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 IBased 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-manne 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 nearest surface water feature in the vicinity of the property is the Morman Slough, located approximately 800 feet north- northeast of the subject property Based on review of the map titled Lines of Equal Depth to Groundwater Spring 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 approximately 20 feet bsg, review of Lanes of Equal Elevation of Groundwater Sprang 1998 (FCD&.WCD) shows the regional ground water flow, direction to be towards the northeast However, review of recent ground water monitoring well data collected at,the site suggests a southwest ground water flow direction at the site Review-of previous I ground water monitonng data at the site and historical FCD&WCD depth to ground water maps dating back to 1971 suggests that ground water depth near the site has fluctuated between 15 and 50 feet bsg T I 25 DOMESTIC AND MUNICIPAL WELL SURVEY Drinking water near the site is currently supplied by the City of Stockton municipal well system The municipal wells in the site area are maintained by California Water Service Company(Cal-Water) Advanced GeoEnvironmental,Inc. II f