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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 2375 West Grant Line Road <br /> Tracy, CA <br /> MTBE Depth to GW <br /> Well ID Date TPPH B T E X 8264 DIPS ETRE TAME TBA Ethanol TOC Water Elevation <br /> (ug/LL( (u/L (u /L u IL u IL) (u IL u IL u IL u /L)( (U2/Lug/L)( MSL ft MSL <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260E <br /> BTEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 8260B <br /> MTBE=Methyl tertiary butyl ether <br /> DIPS=DL-Isopropyl ether,analyzed by EPA Method 82608 <br /> ETBE=Ethyl tertiary butyl ether,analyzed by EPA Method 82608 <br /> TAME=Tertiary amyl methyl ether,analyzed by EPA Method 8260B <br /> TBA=Tertiary butyl alcohol or tertiary butanol, analyzed by EPA Method 82608 <br /> TOC=Top of Casing Elevation <br /> GW=Groundwater <br /> ug/L=Parts per billion <br /> MSL=Mean sea level <br /> ft =Feet <br /> <n=Below detection limit <br /> NA=Not applicable <br /> Notes <br /> a=Hydrocarbon does not match pattern of laboratory's standard <br /> b=The concentration reported reflects individual or discrete unidentified peaks not matching a typical fuel pattern <br /> c=Estimated value The concentration exceeded the calibration of analysis <br /> d=Quantity of unknown hydrocarbon(s)in sample based on gasoline <br /> Ethanol analyzed by EPA Method 8260B <br /> Site surveyed March 7,2003 by Mid Coast Engineers <br /> Wells MWA and MW-2 surveyed on September 15,2004 by Tom Morrow Land Surveying <br /> Wells MW-3 through MW-7 surveyed on April 7,2005 by Virgil Chavez Land Surveying of Vallejo,CA <br /> I <br /> Page 4 <br />