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. 23 February 2000 <br /> AGE-NC Project No 98-0533 <br /> Page 2of8 <br /> boring SB-2-20', west of UST#1 (#39-1808-01), in concentrations of 760 milligrams per kilogram <br /> (mg/kg) and 2,510 micrograms per kilogram (ug/kg), respectively Additionally, TPH-av and BTEX <br /> were detected 3-feet beneath product piping in soil sample P-4 at concentrations of 6,400 mg/kg and <br /> 4,360 ug/kg, respectively Methyl tert-butyl ether (MTBE) was detected in soil samples 1W@15', <br /> 1E@13', and 3E@15' from beneath USTs #1 and#3 at concentrations of 20 ug/kg, 27 ug/kg, and 8 <br /> ug/kg, respectively Total lead was detected in soil sample 3E@15' at concentrations of 324 mg/kg <br /> Details of the UST removal and laboratory analytical results are presented in Underground Storage <br /> Tank Removal Report dated 11 January 2000, prepared by AGE <br /> 2 2 REGIONAL GROUND WATER DEPTH AND FLOW DIRECTION <br /> As stated in the Underground Storage Tank Removal Report dated 11 January 2000, prepared by <br /> AGE, Ground water depth in the vicinity of the site is inferred to be approximately 80 feet below <br /> surface grade, based upon the map Lines of Equal Depth to Ground Water in Wells - Sprang 1997, <br /> published by the San Joaquin County Flood Control and Water Conservation District, however, <br /> significant recharge in the area over the past several wet seasons may have decreased the depth to <br /> ground water significantly <br /> The regional ground water flow direction is toward the southwest, however both ground water depth <br /> and flow direction at the site can vary <br /> 3.0. SCOPE OF WORK <br /> Based upon analytical results of soil samples collected from probe boring SB-1 and SB-2 and UST <br /> removal soil samples, additional investigation will be required to determine the lateral and vertical <br /> extent of hydrocarbon-impacted soil and/or ground water associated with the former UST system <br /> AGE proposes to advance soil borings at the site to determine the lateral and vertical extent of <br /> petroleum hydrocarbon-impacted soil and determine if ground water has been affected <br /> The scope of work will include the following tasks <br /> • Permitting and pre-field work activities, <br /> • Soil sample collection and analysis, <br /> • Grab ground water collection and analysis, <br /> • Completion of borings as ground water monitoring wells (if appropriate), and <br /> Advanced GeoEnviron mental,Inc <br />