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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 2575 Country Club <br /> Stockton, CA <br /> Wic#204-7524-3505 <br /> Depth to GW SPH <br /> Well ID Date TPHg B T E X MTBE 8020 MTBE 8260 TOC Water Elevation Thickness <br /> (u IL) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (MSL) (ft.) MSL (ft. <br /> Abbreviations: <br /> TPHg=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 /> ug/L=parts per billion <br /> msl=Mean sea level <br /> ft=Feet <br /> <n=Below detection limit <br /> D=Duplicate sample <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. r <br /> Page 10 <br />