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1 <br /> GeofoglcafTechnics Inc. <br />' 2741 Ratr Road <br /> Madesto,Cakfomaa 95351 <br /> (209)538-6424/,Ta,#538-5852 <br /> 1 <br /> REPORT <br /> Groundwater Monitoring <br />' Spring Quarter 1999 <br />' George's Service <br /> 1600 Durham Ferry Road <br /> Tracy, California <br /> Project No 425 2 <br /> August 12, 1999 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the Spring Quarter 1999 groundwater monitoring and testing that <br /> took place on April 28, 1999 <br /> Groundwater gradient and bearing were calculated for the water table wells and found to be <br /> 0 0017 ft/ft at N3 7'E A gradient and bearing for the intermediate depth wells was 0 0019 <br /> ft/ft at N76°E <br /> The test results show that aromatic hydrocarbon compounds (BTEX) and gasoline range <br /> petroleum hydrocarbons (TPH-G) are present in 6 of the 12 monitoring wells (MW-1, MW-2, <br /> MW-4, MW-5, MW-102 & MW-202) None of the oxygenated fuel compounds were found <br /> to be present in the monitoring wells <br />' Three domestic water wells in the immediate area of the tanks were tested The Domestic <br /> Well (DW) at 1697 Durham Ferry (DF) and 31448 Hwy 33 were found not to contain BTEX <br />' or TPH-G at this time However, the DW at 1600 DF was found to contain trace <br /> concentrations of Benzene, while the other compounds were not detected <br /> .f <br />