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08 July 1999 AGE-NC Project No. 95-0130 Page 4 of 10 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 3,000 feet west of the property. 2.4. GROUND WATER DEPTH AND GRADIENT The estimated depth to ground water at the site is approximately 50 feet below surface grade (bsg) based on information from Lines of Equal Depth of Water Wells Fall 1997, published by the San Joaquin County Flood Control District and Water Conservation District(SJCFCD). Based on review of a regional ground water elevation map published by the SJCFCD, the prevailing ground water flow direction in central Stockton is generally toward the northeast, although flow directions may be both locally and seasonably variable. Based on data collected during the March 1999 investigation, first observed ground water was approximately 38 feet bsg;the ground water flow direction was towards the northeast at a calculated gradient of 0.007. 3.0. SCOPE OF WORK Based on the results of the previous investigations and UST removal activities, 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; • CPT drilling and soil sample collection; • Monitoring well drilling and well development; • Ground water sample collection and analysis; • Report preparation. Advanced GeoEnviromnenlnl,Inc.