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f LEI <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 2494 Fremont Street - <br /> Stockton, CA <br /> WIC#204-7524-1806 <br /> Sample Measured Corrected SP TPPH B T E X MTBE Methanol Comments <br /> GW Depth GW Elev <br /> Date (ft) (ft) (ft) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) <br /> S-rt Top of Casing Elevation (ft): 21.33 I <br /> 11-May-98 49.82 -28.48 0.01 NA NA NA I NA NA NA NA <br /> 13-Aug-98 48.50 -27.17 0.00 NA NA NA NA NA. NA NA Pre-Development water level <br /> 19-Aug-98 49.81 -28.48 0.00 200400 5000 18000 3000 18000 <2500 .� NA Post-Deveiopment water level <br /> S-2 I Top of Casing Elevation (ft): 21.14 <br /> 11-May-981 49.74 -28.60 0.00 I <50 1 <0.50 <0.50 <0.50 <0.50 I <2.5 <1000 Oxygenate Compounds by 8260 ND <br /> 13-Aug-98 48.65 -27.51 0.00 j <50 1 50.50 1 <0.50 <0.50 1 <0.50 <2.5 NA <br /> S-3 ITop of Casing Elevation ft : 21.48 I I I <br /> 11-May-98 50.08 -28.60 0.00 I <50 I <0.50 I <0.50 <0.50 <0.50 I <2.5 <1000 Oxygenate Compounds by 8260 ND <br /> 13-Aug-98 48.77 -27.29 0.00 <5D <0.50 <0.50 <0.50 <0.50 I <2.5 NA <br /> S-3 (DUP) <br /> 13-Aug-98 NA NA NA <50 1 <0.50 <0.50 <0.50 1 <0.50 <2.5 NA <br /> Abbreviations: <br /> NA=Not analyzed or not available <br /> <x=Not detected at method detection limit of x. <br /> TPPH=Total Purgeable Petroleum Hydrocarbons carbon range C6 to C12 by EPA Method 8015(Modified) <br /> BTEX=benzene,toluene,ethylbenzene, and xylenes by EPA Method 8020. <br /> MTBE=methyl-tertiary-butyl ether by EPA Method 8020 <br /> Oxygenates= tertiary-butanol(TBA);methyl-tertiary-butyl ether(MTBE);di-isopropyl ether(DIPE);ethyl tertiary-butyl ether(ETBE); <br /> and tertiary-amyl methyl ether(TAME)by EPA Method 8260. <br /> 240-0797 l <br />