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WELL CON&TRATIONS _ <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue , <br /> Stockton, CA <br /> Wic #204-7525-0104 <br /> MTBE MTBE Depth to Depth to GW SPH DO <br /> Well ID �`` Date TPPH B T E X 8020 8260 TOC Water SPH Elevation Thickness Reading <br /> I {ug/L} {ug/L} (ug/L) {ug/L} (ug/L) (uglL) (ug/L) (MSL) {ft ) {ft ) {MSL} (ft ) (ppm) <br /> VEW-2 11/23/1998 120,000 3,600 17,000 1,600 24,000 <1000 <200 NA 3441 NA NA 000 NA <br /> VEW-2 02/24/1999 75,000 2,400 14,000 1,400 14,000 310 <100 NA 3247 NA NA 000 NA <br /> VEW-2 0511311999 117,000 3,130 14,100 1,500 22 000 <1250 <125 NA 3139 NA NA 000 NA <br /> VEW-2 08/2011999 110,000 3,240 15,600 1,700 19,100 <2500 636 NA 3448 NA NA 000 NA <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> TEPH =Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX= benzene, toluene, ethylbenzene, xylenes by EPA Method 8020 <br /> MTBE = methyl-tertiary-butyl ether by EPA Method 8020 <br /> TOC=Top of Casing Elevation <br /> SPH =Separate-Phase Hydrocarbons <br /> GW= Groundwater <br /> DO= Dissolved Oxygen <br /> ug1L= parts per billion <br /> msl = Mean sea level <br /> ft= Feet <br /> <n = Below detection limit <br /> NA= Not Applicable <br /> Notes <br /> = Chromatogram pattern indicates an unidentified hydrocarbon <br /> Dissolved Oxygen readings given pnoi to well purging <br /> Page 7 <br />