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I <br /> TABLE 9 AIR SPARGING PILOT TEST GROUNDWATER CONCENTRATIONS <br /> FORMER EXXON RETAIL SITE 7-3942 <br /> 4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA <br /> Concentration(µgiL) <br /> Well Ethyl- <br /> Number _ Date _ Benzene Toluene benzene Xylenes TPH-g MTBE <br /> IV3 9/8/2004 163 373 1,980 6,530 28,400 115/<2 5* <br /> V3A 9/8/2004 228 531 1,980 8,170 39,000 1421<2 5* <br /> V3 Groundwater sample from well V3 prior to air sparging test <br /> V3A Groundwater sample from well V3 after air sparging test <br /> ITPH-g Total Petroleum Hydrocarbons as gasoline <br /> MTBE Methyl tertiary butyl ether <br /> * Analyzed by EPA Method 8260 <br /> gg/L Micrograms per liter <br /> I <br /> I <br /> I <br /> I � <br /> I <br /> I <br /> GSPrqxts\739421MASTERIWPIASR09045Ptkot Test Data(6 Sept 2004) Page I of <br />