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02 March 1999 AGE-NC Project No 98-0448 Page 3 of 10 23 REGIONAL GEOLOGIC 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 Quaternary, 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 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 500 feet north of the site 2 4 GROUND WATER DEPTH AND FLOW DIRECTION In December 1998, ground water depth was measured at approximately 19 feet below surface grade (bsg), ground water gradient was calculated at 0 016 (approximately 85 feet per mile) towards the southwest (Quarterly Report-December 1998, dated 29 January 1999,prepared by AGE) Review of historical depth to ground water maps (FCD&WCD) dating back to 1971 suggests that ground water depth near the site has fluctuated between approximately 15 and 50 feet bsg 3.0. SCOPE OF WORK . Based upon analytical and field data collected from previous investigation of the farmer UST area, the PHS-EHD is requiring a corrective action plan to evaluate feasibility and cost effectiveness of Advanced GeoEnvironmental,Inc