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Table 2 <br /> Historical Groundwater Oxygenate Data <br /> ARCO Seance Station#2093 <br /> 3425 Tracy Blvd,Tracy,Cal ifomia <br /> Date TBA MtBE DIPS EtBE TAME <br /> Well Sampled (ppb) (ppb) (ppb) (ppb) (ppb) <br /> ATR-2 11/17/1997 350 200 <2 <2 <2 <br /> 12/29/2000 <200 890 — — — <br /> 03/27/01 <200 372 — — — <br /> ATR-3 03/27/01 <200 526 — — — <br /> ATRA 12/29/2000 <200 636 -- - -- <br /> 03/27/01 <200 <2 00 — — — <br /> ATR-5 12/29/2000 <200 <2 00 - <br /> 03/27/01 <200 1 B 0 — — — <br /> ATR-6 03/27/01 <200 521 — — — <br /> ATR-7 12/29/2000 <200 175 - — -- <br /> . 03/27/01 <200 305 — — — <br /> ATR-8 12/29/2000 <200 <2 00 -- — -- <br /> 03/27/01 <200 <2 00 — — — <br /> ATR-9 03/27/01 <200 <2 00 — — — <br /> ATR-10 03/27/01 <200 <2 00 — — -- <br /> ATR-11 03127/01 <200 c2 00 — — — <br /> ATR-12 03/27/01 <200 <2 00 — — — <br /> SmW-1 11/17/1997 <500 500 <10 <10 <10 <br /> 03/27101 -- — — — — <br /> Notes <br /> ppb=parts per billion <br /> DIPE=Di-isopropyl ether <br /> TBA=Tertiary butyl alcohol <br /> EtBE=Ethyl tertiary butyl ether <br /> MTBE=Methyl tertiary butyl ether <br /> TAME=Ternary amyl methyl ether <br /> -- <br /> Not Analyzed <br />