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1 <br /> TABLE 2 <br /> Groundwater Analytical Results for Oxygenates <br /> ARCO Service Station No 2186 <br /> 3212 North California Street, Stockton,Cahforma <br /> Well <br /> Sample TBA MTBE DIPE ETBE TAME 1,2-DCA <br /> Number Date i.LWIL /L /L aWL <br /> VW-3B 11/20/97 <100 <2 0 <2 0 <2 0 <2 0 <br /> 2/17/98 NA NA NA NA NA <br /> 6124/98 <200 <2 0 <2 0 <2 0 <2 0 <br /> 9/21/98 310 23 5 <2 0 <2 0 <2 0 <br /> 12/14/98 <200 432 <2 0 <2 0 5 11 <br /> 3/31/99 <200 <2 0 <2 0 <2 0 <2 0 <br /> 6111199 <200 548 <2 0 <2 0 <2 0 <br /> 9/10/99 <1,000 1,500 <10 <10 123 <br /> 1213/99 400 262 <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 /> 9/27/00 NS NS NS NS NS <br /> 12/20/00 <200 592 <2 0 <2 0 <2 0 <br /> 3/16/01 <200 912 <2 0 <2 0 <2 0 <br /> 6/21/01 <3,800* 5,000 <77* <77* <77* <br /> 9113101 <100 90 4 0 <2 0 <2 0 <br /> 12/11/01 <20 200 <2 0 <2 0 <2 0 <br /> • 3/14102 <5 0 26 <0 50 <0 50 _ <0 50 <br /> 6/19/02 21 1,500 <0 50 063 70 28 <br /> Oxygenates analyzed using USEPA Method 8260 FBA=Tertiary butyl alcohol <br /> µg/L=Analytical results in micrograms per Mer MTBE=Methyl tertiary butyl ether <br /> =Below detection limit for analytical methods used DIPE=Di-isopropyl ether <br /> NA=Not analyzed ETBE=Ethyl tertiary butyl ether <br /> NS=Not sampled TAME=Ternary amyl methyl ether <br /> This sample was analyzed outside of the EPA recommended holding time 1,2 DCA=1,2-Dichloroethane <br /> The reported value exceeds the calibration curve but not the linear range <br /> '=Raised MRI,due to high analyte concentration requiring sample dilution <br /> ARCO_2186_Quarterly_Data XLS 4 of 4 <br />