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02 May 2001 AGE-NC Project No 97-0301 Page 4 of 7 from both marine and non-manne sediment, and are generally formed in alluvium denved 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 French Camp Slough located approximately 1,000 feet west of the site 2 4 GROUND WATER DEPTH AND GRADIENT The estimated depth to ground water at the site is approximately 30 feet below surface grade (bsg) based on information from Lines of Equal Depth of Water Wells Fall 1998, published by the San Joaquin County Flood Control Distract 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 south Stockton is generally toward the northeast, although flow directions may be • both locally and seasonably variable Based on ground water monitoring data collected at the site on 30 March 2001, depth to ground water at the site was recorded at approximately 27 feet bsg and ground water flow direction was inferred to be flowing towards the east-southeast at a gradient of 0 003 ft/ft I I 3.0. SCOPE OF WORK Based on the results of the previous investigations and UST removal activities, ground water at the site has been unpacted The lateral and vertical extent of impacted ground water must be determined prior to the imtiatxon of remediation The assessment will require completion of the following tasks • Permitting and pre-field work activities, • CPT soil boring advancement, • Grab ground water sample collection and analysis, • Report preparation Advanced GeoEnvironment$1,Inc