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i � <br /> WELL CON ENTRATIONS <br /> Shell-branded Service Station <br /> 3725 South Tracy Boulevard <br /> Tracy, CA <br /> MTBE MTBE Depth to GW SPH DO <br /> Well ID Date TPPH TEPH B T E X8020 8260 TOC Water Elevation Thickness Reading <br /> u /L /L u u /L (u/L u L u IL1) (uci/L) ((u/L MSL ftMSL ft m <br /> I � <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606, prior to January 23,2001,analyzed by EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX=Benzene,toluene,ethylbenzens,xylenes by EPA Method 82608,prior to January 23,2001,analyzed by EPA Method 8020 <br /> MTBE=Methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation j <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> DO=Dissolved Oxygen <br /> RW=Rediscovered well <br /> ug/L=Parts per billion <br /> ppm=Parts per million <br /> MSL=Mean sea level <br /> ft=Feet <br /> <n=Below detection limit <br /> D=Duplicate sample <br /> NA=Not applicable <br /> Notes <br /> Wells MW-i through MW-3,were decommissioned in July 1990 during station reconstruction and replaced by MW-1A through MW-3A in August 1990 <br /> Site surveyed February 24,2002,by Virgil Chavez Land Surveying of Vallejo,California <br /> Page 7 <br />