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14 April 2004 AGE-NC Project No.04-1143 Page 2 of 17 /3.0. REGIONAL GEOLOGIC/HYDROGEOLOGIC 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 feature was the East Bay Municipal Utility District(E.B.M.U.D)Mokelume Aqueduct approximately 200 feet towards the southeast. 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 CLEAR LAKE soil,a clay in a Class D Hydrogeologic Group, which includes very slow infiltration rates. The corrosion potential for uncoated steel was high. The estimated depth to ground water at the subject property is approximately 100 feet below surface grade(bsg),based on the map titled Lines of Equal Depth to Groundwater, Spring 1999 published by the San Joaquin County Flood Control District and Water Conservation District(FCD&WCD). It is inferred from the map titled Lines of Equal Elevation of Groundwater, Spring 1999, also published by the FCD&WCD, that the local ground water flow is indeterminate at the subject property and in an area of ground water lows; this may be greatly modified by local recharge and discharge patterns. Ground water is considered to be of beneficial use and is utilized for domestic, industrial and commercial purposes. 1� 4.0. HISTORICAL USE The history of the subject site from as early as 1957 to present was researched by reviewing aerial photographs, topographic maps, directory listings, Pesticide Use reports and a personal interview. ... Advanced GeoEnvironmental,Inc.