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18 November 1999 <br /> AGE-NC Project No. 97-0327 <br /> Page 3 of 9 <br /> designated the Sacramento and San Joaquin Valleys, respectively. <br /> Based on the General Soil Map from the San Joaquin County Soil Survey, published by the United <br /> States Department of Agriculture Soil Conservation Service in 1992, the site area is within the <br /> Jackson-Hallenbeck-Stockton (JHS) association. The JHS soils are located within basins, and <br /> generally consist of moderate to poorly drained fine textured soils. The soils are generally derived <br /> from both marine and non-marine sediment, and are generally formed in alluvium derived from <br /> mixed rock sources. <br /> The Modesto, Riverbank, Turlock Lake Formations and overlying recent alluvium are the principal <br /> source of domestic ground water in the 13,500 square-mile San Joaquin Valley Ground Water Basin <br /> (Basin 5-22). This basin is drained primarily by the San Joaquin River. The nearest surface water <br /> feature in the vicinity of the property is the Stockton Diverting Canal located approximately 2,500 <br /> feet north of the site. <br /> 2.5. GROUND WATER DEPTH AND GRADIENT <br /> Based on review of the Lines of Equal Depth to Groundwaler Fall 1997 map published by the San <br /> Joaquin County Flood Control District and Water Conservation District(FCD&WCD),the estimated <br /> depth to ground water at the site is between 60 feet below surface grade (bsg). Review of the map <br /> _ Lines of Equal Elevation ofGroundivater Fall 1997(FCD&WCD)depicts the regional ground water <br /> flow direction towards the northeast. <br /> Based on data collected during the June 1999 investigation, depth to ground water was measured at <br /> approximately 55 feet bse, in soil probe borings P-S. <br /> 3.0. SCOPE OF WORK <br /> Based on the results of the previous investigations and UST removal activities, ground water and <br /> soil at the site has been impacted. The lateral and vertical extent of impacted soil and ground water <br /> must be determined prior to the initiation of remediation or closure request. The assessment activities <br /> will consist of the following tasks: <br /> • Permitting and pre-field work activities; <br /> • Drilling and soil sample collection; <br /> • Monitoring well installation and development; <br /> Advanced Geo£nti ironmental,Inc. <br />