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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 2494 Fremont Street <br /> Stockton, CA <br /> Wic #204-7524-1806 <br /> ' MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPHI B T E X 8020 8260 TOC Water Elevation Thickness <br /> u ILS Ug/l_)_( _(u/L (ug/L (ug/L u IL) u IL MSL ft MSL ft <br /> II <br /> S-3 05/25/1999 <50 0 <0 500 <0 500 <0 500 <0 500 <5 00 NA 2148 4448 -2300 NA <br /> S-3 08/05/1999 <50 0 <0 500 <0 500 <0 500 <0 500 <2 50 NA 2148 4556 -2408 NA <br /> S-3 11/22/1999 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA 2148 4799 -2651 NA <br /> a <br /> MR-1 MR <br /> II <br /> a F S <br /> Abbreviations I <br /> TPPH=Total petroleum hydrocaibons 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 II <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 /> f NA=Not applicable <br /> Notes <br /> a= Pre-Development water level <br /> b=Post-Developmetn water level <br /> Site surveyed January 8,2000 by Virgil Chavez Land Surveying of Vallejo,California <br /> Page 2 <br />