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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 D1PE ETRE TAME Number Date µg/L µg/L Ixg/L µg/L µg/L MW-4 12/14/98 <200 241 <2 0 <2 0 <2 0 (Contd) 03/31/99 <200 7 86 <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 3 02 532 12/20/00 <200 I,150 t Z <2 0 <2 0 102 03/16/01 <200 481 <2 0 <2 0 378 06/21/01 <500* 590 <10* <10* <10* VW-113 03/16/01 <200 210 <2 0 <2 0 <2 0 06/21/01 <100 94 <2 0 <2 0 <2 0 VW-2B 03/16/01 <200 573 <2 0 <2 0 <2 0 06/21/01 <500* 780 <10* <IO* <10* 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 09/21/98 310 235 <2 0 <2 0 <2 0 12/14/98 <200 432 <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 NS NS NS NS NS 12/20/00 <200 592 <2 0 <2 0 <2 0 03/16/01 <200 912 <2 0 <2 0 <2 0 06/21/01 <3,800* 5,000 <77* <77* <77* Oxygenates analyzed using USEPA Method 8260 TBA=Ternary butyl alcohol jig/L-Analyucal results m tmcrograms per liter MTBE-Methyl tertiary butyl ether <=Below detection hmtt for analytical methods eked DIPS=Di isopropyl ether NA—Not analyzed ETBE=Ethyl tertiary butyl ether NS=Not sampled TAME-Ternary amyl methyl ether 'Thts sample was analyzed outside of the EPA recotnmended holding time The reported value exceeds the calibration curve,but not the Imear range •=Raised MRL due to high analyte concentration requinng sample dilution C lARCO121861QTRLY\20001ARCO 2186 Quarterly Data Delta 2 of 2 7/24/01