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V 15 September 1999 AGE-NC Project No. 97-0369 Page 3 of 9 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 Stockton Deep Water Channel located approximately 500 feet west of the site. 2.5. GROUND WATER DEPTH AND GRADIENT Based on review of the Lines of Equal Depth to Groundivater Fall 1997 map 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 between 5 and 10 feet below surface grade (bsg). Review of the map Lines of Equal Elevation of Groundi,,ater Fall 1997(FCD&WCD) depicts the regional ground water flow direction towards the northeast. Based on data collected during the October 1997 investigation, depth to ground water was measured at approximately 8 feet bsg in soil borings P-1 through P-5. 3.0. SCOPE OF WORK Based on the results of the previous investigations and UST removal activities, ground water and _ soil at the site has been impacted. The lateral and vertical extent of impacted soil and ground water must be determined prior to the initiation of remediation. The assessment activities will consist of the following tasks: • Permitting and pre-field work activities; • Drilling and soil sample collection; • Monitoring well installation and development; • Ground water sample collection • Receptor survey; • Preparation of a report of findings. Advanced GcoEncironmental.Inc.