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WELL CONCENTRATIONS <br /> Equilon Enterprises LLC Distribution Terminal <br /> 3515 Navy Drive <br /> Stockton,CA <br /> MTBE MTBE =WaterbPH <br /> li SPH DO <br /> Well ID Date TPPH TEPH B T E X 8020 8260 DIPE ETBE TAME TBA Ethanol Methanol Leatl TOCtion Thickness Reading <br /> u 2 u /L u /L u /L u /L u /L u 2 u /L (u /L u /L u /L u /L u /L u /L m /L (MSL) SL ft. m) <br /> FB 08!31/2006 450 NA 40.50 40.50 40.50 40.50 NA <2.0 NA NA NA NA NA NA NA NA NA NA NA NA NA <br /> FB 11/16/2006 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <br /> FB 02/26/2007 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <br /> FB 05/29/2007 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <br /> FB 11/29/2007 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <br /> FB 02/22/2008 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA <br /> Abbreviations: <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B;prior to May 31,2001,analyzed by EPA Method 8015. <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015. <br /> STEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 82608;prior to May 31,2001,analyzed by EPA Method 8020. <br /> MTBE=Methyl tertiary butyl ether has been historically analyzed using EPA Methods 8020 and 82608. Per the request of CVRWDCB in March 2001,all subsequent sampling events have used EPA Method 82608. <br /> DIPE=DFisopropyl ether,analyzed by EPA Method 82608 <br /> ETBE=Ethyl tertiary butyl ewer,analyzed by EPA Method 82608 <br /> TAME=Tertiary amyl methyl ether.analyzed by EPA Method 82608 <br /> TBA=Tertiary butyl alcohol or tertiary butanol,analyzed by EPA Method 8260B <br /> EB=Equipment Blank <br /> FB=Field Blank <br /> TB=Trip Blank <br /> TOC=Top of Casing Elevation <br /> 00=Dissolved Oxygen <br /> SPM=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> MSL=Mean sea level <br /> CVRWOCB=California Regional Water Duality Control Board-Central Valley Region <br /> ug/L=Parts per billion <br /> ppm=Parts per million <br /> ft=Feet <br /> <n=Below detection limit <br /> n1n/n=Pre-purge,mid-purge,and post-purge DO readings. <br /> (D)=Duplicate sample <br /> NO=Not detected at or above quantitative limn. <br /> NA=Not applicable <br /> Page 69 <br />