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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton,CA <br /> MTBE MTBE Depth to GW SPH DCI <br /> Well 10 Date TPPH B T E X 8020 8260 DIPE ETRE TAME TBA 1,2 AGA EDB Ethanol Methanol 74C Water Eievatitsn Thickness Reading <br /> u u l u u u 1L (ug/L (ug/L (ug/L u L u"1L 6" (ug/L u u u 1MSL R MSL ft m <br /> MW-10 512912003 <50 <0 50 <0 50 <0 60 <0 50 NA <5 0 NA NA NA NA NA NA NA NA 741 1948 1207 NA NA <br /> MW-10 811411003 <50 <0 50 <0 50 <0 50 <1 0 NA 091 NA NA NA NA NA NA NA NA 741 2046 -1305 NA NA <br /> MW-10 11/3/2003 <50 <0 50 <0 50 <0 50 <1 0 NA <0 50 <2 0 <2 0 <2 0 <5 0 <0 5 <0 5 NA NA 741 2115 -1374 NA NA <br /> MW 10 2/9/2004 <50 <0 50 <0 60 <0 50 <1 0 NA <0 50 <2 0 <2 0 <2 0 450 <0 50 <050 NA NA 741 2058 1317 NA NA <br /> MW 10 511012004 <50 <0 50 43 <0 50 <1 0 1 NA <0 50 <2 0 <2 0 <2 0 <5 0 <0 60 <0 50 1 NA NA 741 2000 -1259 NA NA <br /> MW-10 81912004 <50 <0 50 <0 50 <0 50 <1 0 NA <0 50 <2 0 <2 D <2 0 <5 0 <0 50 <0 50 <50 <500 741 2128 -1387 NA NA <br /> MW 10 1111+5!2004 <50 h <0 50 <0 50 <0 50 <1 0 NA <0 50 <2 0 <2 0 <20 <5 0 <0 50 <0 50 NA NA 741 22 01 -1460 NA NA <br /> MW 10 2/8/2005 <50 <0 50 <0 50 <0 50 <1 0 NA <0 50 <2 0 <2 0 <2 0 <5 0 -050 <0 50 NA NA 741 2080 -1339 NA NA <br /> MW-10 5/9/2005 <50 <0 50 <0 50 <0 50 <1 0 NA <0 50 <20 <2 0 <2 0 <5 0 <0 50 <0 50 NA NA 741 1850 -1109 NA NA <br /> MW-10 8/811005 NA NA I NA NA NA NA NA NA NA NA NA NA NA NA NA 741 1821 -1080 NA NA <br /> AbbreHabons <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608 prior to November 21 2000 analyzed by EPA Method 8015,except where noted <br /> BTEX=Benzene,toluene,ethytbenzene,xylenes by EPA Method 62608 prior to November 21,2000,analyzed by EPA Method 8020,except where noted <br /> MTBE=Methyl tertiary butyl ether <br /> DIPE=Di Isopropyl ether analyzed by EPA Method 82608 <br /> ETBE=Ethyl tertiary butyl ether,analyzed by EPA Method 62608 <br /> TAME =Ternary amyl melhyl ether analyzed by EPA Method 82608 <br /> TBA=Terbary butyl alcohot or tertiary butanol analyzed by EPA Method 82608 <br /> 1 2-DCA=1 2-Dichloroelhane analyzed by EPA Method 82608 n <br /> EDB=Ethylene dibromide analyzed by EPA Method 82608 <br /> TOC=Top of Casing Elevation <br /> SPH=Separate Phase Hydrocarbons <br /> GW=Groundwater <br /> DO=Dissolved Oxygen <br /> ug1L=Parts per billion a ' <br /> ppm=Parts per million <br /> M$L=Mean sea level <br /> ft =Feet <br /> <n=Below detection limit <br /> (D)=Duplicate sample <br /> NA=Not applicable <br /> nln=Pre purgelPost-purge M } <br /> Page 18 <br />