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Table 2 <br /> Historical Groundwater Oxygenate Data <br /> ARCO Service Station#2093 <br /> 3425 Tracy Blvd,Tracy,Califomia <br /> Date TBA MtBE DIPE E1BE 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 /> I <br /> ATR-4 12/29/2000 <200 636 <br /> ATR-5 12/29/2000 <200 <2 00 -- - <br /> ATR-7 12!2912000 <200 175 -- -- <br /> ATR-8 12/29/2000 <200 <2 00 -- -- <br /> SMW-1 11/17/1997 <500 500 <10 <10 <10 <br /> i <br /> Notes <br /> ppb=parts per billion <br /> DIPS=DE isopropy4 ether <br /> TBA=Tertiary butyl alcohol <br /> ELBE=Ethyl tertiary butyl ether <br /> MtBE=Methyl tertiary butyl ether <br /> TAME=Tertiary amyl methyl ether <br />