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r ' 07 July 2000 AGE-NC Project No 98-0448 Page 4 of 12 ' 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 Calaveras River, approximately 3,000 feet north of the property 2 4 GROUND WATER DEPTH AND FLOW DIRECTION Based on review of the map titled Lines of Equal Depth to Groundwater Sprang 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 towards the northeast However, review of recent ground water monitoring well data collected from the site suggests a southwest ground water flow direction Review of previous ground water momtoring at the site and historical depth to ground water maps (FCD&WCD) dating back to 1971 suggests that ground water depth near the site has fluctuated between 15 and 50 feet bsg Between October 1994 and April 2000, depth to ground water'at the site generally,decreased from I33 feet bsg to 17 feet bsg with general ground water flow direction towards the southwest 3.0. SCOPE OF WORK Based,upon the results detailed in the AGE-prepared Corrective Action Plan, dated 15 February 2000, ground water and soil remediation within the core petroleum hydrocarbon-impacted area at the site is recommended Remediation within the core petroleum hydrocarbon impacted area at the site will consist of the following tasks • Permitting, planning and pre-field work activities, a Advanced GecEnvironmental,Inc