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Geofoglcaf Techn Inc. <br /> 2741 River Road <br /> ;'Modesto,Cahfornw 95351 <br /> (209)538-6424IFxC#538-5852 <br /> REPORT <br /> Groundwater Monitoring <br /> Spring Quarfeir 1998 <br /> George's Servke <br /> 11600 Durham Ferry Road <br /> Tracy, California <br /> Project No 425 2 <br /> September 22, 1998 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the Spring Quarter 1998 round of groundwater monitoring and <br /> testing that took place on May 29, 1998 The test results show that relatively elevated <br /> concentrations of the aromatic hydrocarbon compounds (BTEX) and gasoline range <br /> petroleum hydrocarbons (TPH-G) are present in 5 of the 9 monitoring wells (MW-1, MW-2, <br /> MW-4, MW-5 and MW-8) <br /> Three domestic water wells in the immediate area of the tanks were tested and found not to <br /> contain gasoline at this time <br /> Site specific gradient and bearing were calculated and found to be 0 0019 ft/ft at N290E <br /> 1.0 GROUNDWATER MONITORING <br /> 1.1 Hydrology of Site <br /> Horizontal Groundwater Gradient <br /> The average groundwater elevation at the site was 73 82 feet above mean sea level <br />