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TABLE 2 Groundwater Analytical Results for Oxygenates ARCO Service Station No 2186 3212 North California Street, Stockton, California Well Sample TBA MTBE DIPE ETBE TAME Number Date gg/L gg/L µg/L µg/L gg/L MW-4 11/20/97 190 13 <2 0 <2 0 <2 0 02/17/98 180 25 <2 0 <2 0 <2 0 06/24/98 <200 181 <2 0 <2 0 <2 0 09/21/98 <200 <2 0 <2 0 <2 0 <2 0 12/14/98 <200 24 1 <2 0 <2 0 <2 0 03/31/99 <200 786 <2 0 <2 0 <2 0 06/11/99 <200 346 <2 0 <2 0 <2 0 09/10/99 <1,000 1,060 <10 <10 <10 12/03/99 <400 760 <4 0 <4 0 656 04/03/00 <200 106 <2 0 <2 0 <2 0 06/22/00 <200 2,070 <2 0 <2 0 157 09/27/00 499 6,590 <2 0 302 53 2 12/20/00 <200 1,150 t 2 <2 0 <2 0 102 03/16/01 <200 4812 <2 0 <2 0 378 VW-1B 03/16/01 <200 21 0 <2 0 <2 0 <2 0 VW-2B 03/16/01 <200 57 3 <2 0 <2 0 <2 0 VW-3B 11/20/97 <100 <2 0 <2 0 <2 0 <2 0 02/17/98 NA NA NA NA NA 06/24/98 <200 <2 0 <2 0 <2 0 <2 0 09/21/98 310 23 5 <2 0 <2 0 <2 0 12/14/98 <200 43 2 <2 0 <2 0 5 11 03/31/99 <200 <2 0 <2 0 <2 0 <2 0 06/11/99 <200 548 <2 0 <2 0 <2 0 09/10/99 <1,000 1,500 <10 <10 123 12/03/99 <200 262 <2 0 <2 0 208 04/03/00 <200 252 <2 0 <2 0 <2 0 06/22/00 <200 3,180 <2 0 <2 0 23 09/27/00 N5 NS NS NS NS 12/20/00 <200 592 <2 0 <2 0 <2 0 03/16/01 <200 9 12 <2 0 <2 0 <2 0 Oxygenates analyzed using USEPA Method 8260 TBA=Tertiary butyl alcohol µ81L=Analytical results to micrograms per liter MTBE=Methyl tertiary butyl ether <=Below detection limit for analytical methods used DIPS=D:-:sopropyl ether NA=Not analyzed ETBE=Ethyl tertiary butyl ether NS=Not sampled TAME-Tertiary amyl methyl ether 'This sample was analyzed outside of the EPA recommended holding time The ieported value exceeds the calibration curve,but not the linear range C 1ARC0121861QTRLY1200012186 Quai terly Data XLS Delta 2 of 2 5/4/01