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WELL CONCOTRATIONS • <br /> Shell-branded Service Station - <br /> 2575 Country Club <br /> Stockton, CA <br /> Wlc #204-7524-3505 <br /> i <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH B T E X 8020 I 8260 TOC Water Elevation Thickness <br /> (ug/L (ug/L (ug/L u IL u IL (ug/L (ug/L MSL ft MSL ft <br /> I <br /> Warman Pier 7127199 J NA I NA NA NA NA NA NA 1390 1085 305 NA <br /> Warman Pier 10128199 NA NA NA NA NA NA NA 1390 10,61- 329 NA <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> BTEX=benzene, toluene, ethylbenzene,xylenes by EPA Method 8020 <br /> MTBE = methyl-tertiary-butyl ether <br /> TOC =Top of Casing Elevation <br /> SPH = Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> uglL= parts per billion <br /> msl = Mean sea level <br /> ft= Feet <br /> <n = Below detection limit <br /> D= Duplicate sample <br /> NA= Not applicable <br /> Notes <br /> a = Depth to ground water measurement and reference elevation datum is top of boot(adapted for vapor extraction) at well head <br /> Warman Pier well elevation referenced from Survey Marker <br /> Port= Indicates ground water sample collected at the well head sampling port <br /> Down = Indicates ground water sample collected inside the well with a bailer <br /> b= Not sampled due to insufficient water capacity on the truck <br /> 1 <br /> Page 15 <br />