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TABLE 2 <br /> Groundwater Analytical Results for Oxygenates <br /> ARCO Service Station No 2186 <br /> 3212 North California Street, Stockton,California <br /> Well <br /> Sample TBA MTBE RIPE ETBE TAME <br /> Number Date µ /L µ /L A91L µ 1L <br /> VW-1B 3/16/01 <200 210 <2 0 <2 0 <2 0 <br /> 6121101 <100 94 <2 0 <2 0 <2 0 <br /> 9/13/01 <710 1,100 <14 <14 <14 <br /> VW-2B 3116101 <200 573 <2 0 <2 0 <2 0 <br /> 6/21/01 <500* 780 <10* <10* <10* <br /> 9/13/01 <1,400 2,400 <29 <29 <29 <br /> VW-3B 11/20/97 <100 <2 0 <20 <2 0 <2 0 <br /> 2/17/98 NA NA NA NA NA <br /> 6/24/98 <200 <2 0 <2 0 <2 0 <2 0 <br /> 9/21198 310 235 <2 0 <2 0 <2 0 <br /> 12/14/98 X200 432 <2 0 <2 0 5 11 <br /> 3/31/99 <200 <2 0 <2 0 <2 0 <2 0 <br /> 6/11/99 <200 548 <2 0 <2 0 <2 0 <br /> 9110199 <1,000 1,500 <10 <10 123 <br /> 12/3/99 <200 262 <2 0 <2 0 208 <br /> 4/3/00 <200 252 <2 0 <2 0 <2 0 <br /> 6/22/00 <200 3,180 <2 0 <2 0 23 <br /> 9/27100 NS NS NS NS NS <br /> 12/20/00 <200 592 <2 0 <2 0 <2 0 <br /> 3/16/01 <200 9 12 <2 0 <2 0 <2 0 <br /> 6/21/01 <3,800* 5,000 <77* <77* <77* <br /> 9113/01 <100 90 <2 0 <2 0 <2 0 <br /> Oxygenates analyzed using USEPA Method 8260 TBA=Tertiary butyl alcohol <br /> µg/L=Analytical results in micrograms per hter MTBB=Methyl tertiary butyl ether <br /> Below detection limit for analytical methods used DIP£=Di isopropyl ether <br /> NA=Not analyzed ETRE=Ethyl ternary butyl ether <br /> NS=Not sampled TAME-Tertiary amyl methyl ether <br /> i This sample was analyzed outside of the EPA recommended holding time <br /> The reported value exceeds the calibration curve but not the linear range <br /> '=Raised MRL due to high analyte concentration requtnttg sam le dilution <br /> Delta <br /> ARCO 2186 Quarterly Data XLS 3 of 3 <br />