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TABLE 4 <br /> Groundwater Analytical Results <br /> Former ARCO Service Station No 6100 <br /> 25775 Patterson Pass Road <br /> Tracy, California <br /> Sample Date GRO Benzene Toluene Ethylbenzene Xylenes* MTBE TBA DIPE ETBE TAME EDB 1,2-DCA Ethanol <br /> ID Sampled (µg/L) (pg/L) (Ftg/L) (µg/L) (µg/L) (gg/L) (Vg/L) (µg/L) (µg/L) (ELg/L) (1tg/L) (Ng/L) (1tg/L) <br /> MW-16 5/10/2006 <50 24 <0 50 <0 50 <0 50 <0 50 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <300 <br /> MW-17 5/10/2006 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <300 <br /> MW-18 5/10/2006 <50 88 <0 50 <0 50 <0 50 <0 50 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <300 <br /> Explanation Analytical Methods <br /> GRO=Gasoline range organics GRO,BTEX and fuel additives analyzed using EPA Method 8260B <br /> B1 EX=Benzene,toluene,ethylbenzene,total xylenes <br /> MTBE=Methyl tert-butyl ether <br /> DIPS=Di-isopropyl ether Analytical Laboratory <br /> TBA=Tertraq butyl alcohol Sequoia Analytical(ELAP#12 10) <br /> ETBE=Ethyl tert butyl ether <br /> TAME=Tertiary amyl methyl ether <br /> EDB=Dibromoethane <br /> 1,2-DCA= 1,2-Dichloroethane <br /> µglL=micrograms per liter(parts per billion) <br /> *=Total Xylenes <br /> i <br /> 6100wateranalytica12006 Page 1 of I 5TWATU5 <br />