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24 May 2004 AGE-NC Project No.04-1162 Page 3 of 17 3.0. REGIONAL GEOLOGIC/11"ROGEOLOGIC SETTING The subject 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 to its present elevation with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly horizontal 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. 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 features were the California Aqueduct,which transected the subject property and the Delta-Mendota Canal approximately 1,000 feet to the north at the closest point. As included in the report prepared by Environmental Data Research, Inc. (EDR) and provided in Appendix D of this report, the U. S. Department of Agriculture's Soil Conservation Service STATSGO (State Soil Geographic Database) soil maps showed the dominant soil composition in the general area of the subject property to be CARBONA soil, a clay loam in a Class D Hydrogeologic Group, which includes very slow infiltration rates. The corrosion potential for uncoated steel was high. The San Joaquin County ground water map data provided in Lines of Equal Depth to Groundwater, Spring 1999 published by the San Joaquin County Flood Control District and Water Conservation District(FCD&WCD) and Lines of Equal Elevation of Groundwater, Spring 1999, also published by the FCD&WCD does not extend to the south Tracy area. Historical ground water data provided by the California Department of Water Resources(DWR)at htto://www.zroundwater.water.ca.gov for Well 03SO5326MO01M located on Section 26, adjacent to east,notes a depth to ground water in April 2004 of 162.6 feet below surface grade s ).Ground water is considere o e o eneficial use and is utilized for domestic, industrial and commercial purposes. Advanced GeoEnvironn ental,Inc.