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li I l WELL CANTRATIONS • Shell-branded Service Station 2494 Fremont Street Stockton, CA If MTBE MTBE Depth to GW SPH FWGII Date TPPH B T E X 8020 8260 DIPS ETRErT TBA Methanol Ethanol 1,2-DCA EDB TOC Water Elevation Thickness u /L u /L u /L u /L jug/L) u & u /L u /L k uIL u /, (u l uIL uIL MSL ft MSL ft i S443 0510512004 86 082 072 071 30 NA 22 '79 <2 0 <ZA <5 0 <1,000 <50 75 <0 50 2243 5418 .3175 NA S-5 12/22/2003 NA 'NA NA NA NA NA NA NA NA NA NA NA NA NA NA 2194 5544 -3350 NA S-5 12!3012003 <50 <0 50 <0 50 <0 50 <1 0 NA <0 50 25 <2 0 <2 0 <5 0 <500 <50 49 <0 50 2194 5533 -3339 NA S-5 02105/2004 <50 <0 50 <0 50 <0 50 <1 0 NA <0 50 27 <2 0 <2 0 <5 0 <500 <50 45 <0 50 2194 5486 -3292 NA S-5 05105/2004 <50 <0 50 <0 50 <0 50 <10 NA <0 60 30 <20 <20 <50 <Boo <50 37 <0 50 2194 5370 -3176 NA S-6 12!22!2003 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 2066 5435 -3369 NA S-6 12/30/2003 <50 <0 5a <0 50 <0 50 <1 0 NA 35 <2 0 <2 0 <2 0 <5 0 <500 <50 16 <0 50 2066 6420 -3354 NA S-6 02/05/2004 <50 <0 50 <0 50 <0 50 <1 0 NA 92 <2 0 <2 0 <2 0 <5 0 <500 <50 26 <0 50 2066 5350 -3284 NA S-6 05105/Z004 <50 <0 50 <O 50 <0 50 <1 0 NA 100 <20 <2 0 <2 0 <5 0 <1,000 <50 26 <0 50 2066 62.35 -3169 NA !f Abbreviations TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B prior to May 14,2001,analyzed by EPA Method 8015,except where noted BTEX=Benzene toluene,ethylbenzle ne xylenes by EPA Method 82608,prior to May 14,2001,analyzed by EPA Method 8020,except where noted MTBE=Methyl tertiary butyl ether TBA=Tertiary butyl alcohol,or tertiary butanol D1PE=DI-isopropyl ether ETBE n Ethyl tertiary butyl ether ! TAME=Tertiary amyl methyl ether I= 1,2-DCA=1,2-Dichloroethane EDB=1,2-Dibromoethane TOC=Top of Casing Elevation SPH=Separate-Phase Hydrocarbons GW=Groundwater ug/L=Paris per billion MSL=Mean sea level I ft =Feet <n=Below detection limit If NA=Not applicable ii i i� Page 5 I+ u