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. Table 2 <br /> Groundwater Analytical Results for Oxygenates (USEPA Method 8260) <br /> ARCO Service Station No. 2186 <br /> 3212 North California Street, Stockton, California <br /> Well <br /> Sample <br /> Number Date Tertiary butanol MTBE D1PE ETBE TAME <br /> MW-4 11/20/97 190 13 <2 <2 <2 <br /> MW-4 02/17/98 180 25 <2 <2 <2 <br /> MW-4 06/24/98 <200 18 1 <2 <2 <2 <br /> MW-4 09/21/98 <200 <2 <2 <2 <2 <br /> MW-4 12/14/98 <200 241 <2 <2 <2 <br /> MW-4 03/31/99 <200 786 <2 <2 <2 <br /> MW-4 06/11/99 <200 346 <2 <2 <2 <br /> MW-4 09/10/99 <1,000 1,060 <10 <10 <10 <br /> MW-4 12/03/99 <400 760 <4 <4 656 <br /> MW4 04/03/00 <200 106 <2 <2 <2 <br /> MW-4 06/22/00 <200 2070 <2 <2 157 <br /> VW-3 11/20/97 <100 <2 <2 <2 <2 <br /> VW-3 02/17/98 NA NA NA NA NA <br /> VW-3 06/24/98 <200 <2 <2 <2 <2 <br /> VW-3 09/21/98 310 235 <2 <2 <2 <br /> VW-3 12/14/98 <200 43 2 <2 <2 5 11 <br /> VW-3 03/31/99 <200 <2 <2 <2 <2 <br /> VW-3 06/11/99 <200 548 <2 <2 <2 <br /> VW-3 09/10/99 <1,000 1,500 <10 <10 123 <br /> VW-"l 12/03/99 <200 262 <2 <2 208 <br /> VW-3 04/03/00 <200 252 <2 <2 <2 <br /> VW-3 06/22/00 <200 3180 <2 <2 23 <br /> Oxygenates analyzed using USEPA Method 8260 MTBE=Methyl tertiary butyl ether <br /> Analytical results in parts per billion DIPE=Di-isopropyl ether <br /> <=Below detection limit for analytical methods used ETBE=Ethyl tertiary butyl ether <br /> NA=Not analyzed TAME-Tertiary amyl methyl ether <br /> C lARC0121861QTRLY12186g200 xls Delta <br /> Page 2 of 2 9/19/00 <br />