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TABLE 2 • GROUNDWATER ANALYTICAL RESULTS FOR OXYGENATES AND ADDITIONAL COMPOUNDS (U S EPA METHOD 8260) Former ARCO Ser-weStatlon No 2168 441 Charter Way Stockton, California Well Sample TBA MTBE DIPE ETRE TAME 1,2-DCA Number Date pg/L µg/L µg/L µg/L µg/L µg/L MW-7 11/17/97 NA NA NA NA NA NA 05/22/98 <10,000 <100 <100 <100 <100 NA 08/12/98 <200 <2 <2 <2 <2 NA 11/09/98 <200 <2 <2 <2 <2 NA 02/17/99 <200 <2 <2 <2 <2 NA 05/25/99 <200 <2 <2 <2 <2 NA 08/18/99 <200 <2 <2 <2 <2 NA 12/17/99 <200 <2 <2 <2 <2 NA 02/22/00 <200 <2 <2 <2 <2 NA 06/22/00 <200 <2 4 88 <2 <2 NA 08/30/00 <200 <2 <2 <2 <2 <2 11/21/00 <200 <2 <2 <2 <2 <2 02/15/01 <200 <2 <2 <2 <2 <2 5/17/01 [2] <1,000 <10 <10 <10 <10 <10 08/16/01 <200 <2 <2 <2 <2 <2 • MW-8 08/30/00 <200 <2 <2 <2 <2 3 38 11/21/00 <200 <2 <2 <2 <2 2 18 02/15/01 <200 <2 <2 <2 <2 346 05/17/01 <200 <2 <2 <2 <2 264 08/16/01 <200 <2 <2 <2 <2 32 MW-813 08/30/00 <200 <2 <2 <2 <2 3 80 11/21/00 <200 <2 <2 <2 <2 3 82 02/15/01 <200 <2 <2 <2 <2 436 05/17/01 <200 <2 <2 <2 <2 2 58 08/16/01 <200 <2 <2 <2 <2 <2 MW-8C 08/30/00 <200 <2 <2 <2 <2 <2 11/21/00 <200 <2 <2 <2 <2 <2 02/15/01 <200 <2 <2 <2 <2 <2 05/17/01 <200 <2 <2 <2 <2 <2 08/16/01 <200 <2 <2 <2 <2 <2 µg/l,=Analytical results in micrograms per liter [)]This sample was analyzed outside of EPA recommended hold time TBA=Tertiary butyl alcohol [2�The i epor4mg limit(s)for this sample have been raised due to MTBE=Methyl tertiary butyl ether high levels of non-target mterferents DIPEµDi-isopropyl ether FTBE=Ethyl tertiary butyl ether . TAME=Tertiary amyl methyl ether 1,2-DCA= 1,2-D1chIOTOethane <=Below detection lrtnit for analytical methods used C\ARC0121681QTRLYITAB1,CS1Ai eo2168 QUARTERLY DATA 4 of 4 Delta 09126/01