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10 December 2002 <br /> AGE-NC Project No. 02-0961 <br /> Page 2 of 5 <br /> Geology, 1977).Rocks composing the basement complex of the Province have not been completely <br /> defined but are believed to be metamorphic and igneous in origin. <br /> The Modesto, Riverbank and Turlock Lake Formations and overlying Recent alluvium are the <br /> principal sources of domestic ground water in the 13,500-square mile San Joaquin Valley Ground <br /> Water Basin(Basin 5-22). The estimated depth to ground water at the site is 20 feet below surface <br /> grade (bsg) based on information from Lines of Equal Depth of Water Wells Fall 1999, published <br /> by the San Joaquin County Flood Control District and Water Conservation District- FCD&WCD. <br /> Based on the map titled Lines of Equal Elevation of Groundwater Spring 1999 also published by the <br /> San Joaquin County FCD&WCD, the site is in an area where ground water appears to be traveling <br /> north to northeast. One domestic well is located on the property, at approximately 100 feet north of <br /> the USTs location. <br /> 2.2. DISPENSER AND PRODUCT LINE UPGRADE <br /> Underground product lines to the existing gasoline and diesel underground storage tanks, and the <br /> fuel dispensers on the site were upgraded on 18 September 2002;during the upgrade activities,AGE <br /> collected nine soil samples from the product line trenches and former dispenser locations.Laboratory <br /> analytical results detected total petroleum hydrocarbons quantified as diesel (TPH-d) and gasoline <br /> (TPH-g),and low concentrations of ethylbenzene and xylenes.Based upon the analytical results,the <br /> EHD required the preparation of a work plan to define the lateral and vertical extent of <br /> contamination in soil and ground water. <br /> 3.0. SCOPE OF WORK <br /> AGE proposes to collect soil samples to determine if petroleum hydrocarbon and/or MTBE-impacted <br /> soil and/or ground water is present beneath the site.The preliminary site assessment will include the <br /> following tasks: <br /> • Permitting and pre-field work activities; <br /> • Soil and groundwater sample collection and analysis; <br /> • Report preparation. <br /> The preliminary site assessment tasks are discussed below. <br /> Advanced Geo Environmental,Inc. <br />