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25 October 2000 AGE-NC Project No. 00-0782 Page 2 of 6 2.2. 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 features in the vicinity of the subject property are the South Main Canal approximately 6,000 feet to the west and the Mokelumne River, approximately 2.4 miles to the north. 2.3. GROUND WATER DEPTH AND FLOW DIRECTION The estimated depth to ground water at the subject property is approximately 65 feet bsg, based on the map titled Lines of Equal Depth to Groundwater, Fall 1998 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, Fall 1998, also published by the FCD&WCD, that groundwater elevation at the subject property is approximately 20 feet below mean sea level and that the local groundwater flow is toward the southeast on the subject property, but this may be greatly modified by local recharge and discharge patterns. 3.0. SCOPE OF WORK AGE proposes to collect soil and discrete ground water samples to assess for petroleum hydrocarbons and MTBE in the soil and/or ground water beneath the site. The phase II site assessment will consist of the following tasks: • Permitting and pre-field work activities; • Soil sample collection and analysis; • In-situ ground water sample collection and analysis; Advanced GeoEnvironmental,Inc.