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WELL CONCENTRATIONS Shell-branded Service Station 2494 Fremont Street Stockton, CA MTBE MTBE `` Depth to GW SPH Well!D Date TPPH B Ti E X 8020 8260 DIPE ETRE TAME TBA 1,2-DCA EDS Metfi`anol Ethanol TOC Water Elevation Thickness u L u L (U912 u IL u IL u IL u IL u l u IL u IL u 1L u IL u IL u"IL u IL MSL ft MSL ft fl � S-5 02/2112005 659 <0 50 <0 50 <0 50 <1 0 NA <0 50 54 <20 <20 <5 0 61 <0 50 <500 <50 2194 1 55 68 -3374 NA jf ffS-6 12/22/2003 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 2066 5435 -3369 NA 12/30/2003 <50 <0 50 <0 50 <0 50 <1 0 NA 35 <2 0 <2 0 <2 0 <5 0 16 <0 50 <500 <50 2066 5420 -3354 NA 02/05/2004 <50 <0 50 <0 50 <0 50 <1 0 NA 92 <2 0 <20 <2 0 <5 0 26 <0 50 <500 <50 2066 5350 -3284 NA 05/05/2004 <50 <0 50 <0 50 <0 50 <1 0 NA 100 <2 0 <2 0 <2 0 <5 0 25 <0 50 <1,000 <50 2.066 5235 -3169 NA S-6 07/2612004 <50 <0 50 <0 50 <0 50 <1 0 NA 25 <20 <20 <20 <50 19 <0 50 <500 <50 2066 53 85 -3319 NA S-6 11/10/2004 <50 <0 50 <0 50 -050 <1 0 NA 16 <2 0 <2 0 <20 <50 35 <0 50 <500 <50 2066 5609 -3543 NA 5-6 02!2112005 <so <0 50 <0 50 <0 50 <1 0 NA 60 <20 <20 <2 0 <5 0 20 <0 50 <500 <60 2066 5433 -3367 NA::j Abbreviations TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B,pnor to May 14,2001 analyzed by EPA Method 8015,except where noted BTEX=Benzene,toluene,ethylbenzene xylenes by EPA Method 8260B,prior to May 14 2001,analyzed by EPA Method 8020,except where noted MTBE=Methyl tertiary butyl ether TBA=Tertiary butyl alcohol or terhary butanol,analyzed by EPA Method 8260B DIPE=Di-isopropyl ether analyzed by EPA Method 8260B ETRE=Ethyl tertiary butyl ether,analyzed by EPA Method 8260B TAME=Tertiary amyl methyl ether,analyzed by EPA Method 8260B 1 2-DCA=1,2-Dichloroethane analyzed by EPA Method 8260B EDB=1,2-Dibromoethane analyzed by EPA Method 8260E TOC=Top of Casing Elevabon SPH=Separate-Phase Hydrocarbons GW=Groundwater ug)L=Parts per billion MSL=Mean sea level ft =Feet <n=Below detection limit NA=Not applicable s _ Pa e 6