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I <br /> Table 2 <br /> Fuel Oxygenates Analytical Data <br /> ARCO Service Station Na 2093 <br /> 3425 Tracy Blvd, Tracy, CA <br /> Well Date Ethanol TBA MtBE DIPE EtBE TAME 1,2-DCA EDB <br /> Number Sampled (pglL) WL) (Ug1L) (pg/L) (pg1L) (pg/L) (ug/L) (pgIL) Comments <br /> ATR-7 12/17/2002 — <5 <0 5 <0 5 <0 5 <0 5 — -- <br /> 03/31/2003 <100 <20 <0 50 <0 50 <0 50 <0 50 -- — <br /> 06/09/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 -- — <br /> 09/18/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 — -- <br /> 12/24/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 -- -- <br /> 03/12/2004 <100 <20 <0 50 <0 50 <0 50 <0 50 — — <br /> 06/01/2004 — — -- -- -- — — — Not Sampled <br /> 09/20/2004 -- — — — — -- — — Not Sampled <br /> 12113/2004 — — _ — -- -- -- Not Sampled <br /> ATR-8 12/29/2000 — <200 <2 00 -- — -- — _ <br /> 3/27/2001 - <200 <2 00 -- -- - _ - <br /> 6/20/2001 - - <2 0 <br /> 9/12/2001 - <200 - - -- - _ <br /> 12/19/2001 - <20 21 <br /> 3/14/2002 - <50 <0 50 - -- - - _ <br /> 612$12002 -- <5 082 <0 5 <0 5 <0 5 -- <br /> 9/11/2002 - <20 073 <0 5 <0 5 <05 -- -- <br /> 12/17/2002 -- <5 17 <0 5 <0 5 <0 5 - - <br /> 03/31/2003 <100 <20 1 1 <0 50 <0 50 <0 50 -- - <br /> 06/09/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 - - <br /> 09/18/2003 <100 <20 23 <1 0 <1 0 <1 0 -- - <br /> 12/24/2003 <100 <20 30 <1 0 <1 0 <1 0 -- - <br /> 03/12/2004 <100 <20 <0 50 <0 50 <0 50 <0 50 - -- <br /> 06/01/2004 <100 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <br /> 09/20/2004 <100 <20 19 <1 0 <1 0 <1 0 <0 50 <0 50 <br /> L.12/1312004 1 <100 1 <20 1 13 1 <1 0 1 <1 0 <1 0 <0 50 <0 50 <br /> ATR-9 3/27/2001 -- <200 <2 00 -- - - - _ <br /> 6/20/2001 - - -- - - <br /> 9/12/2001 -- <200 - -- - <br /> 12/19/2001 - -- - - -- <br /> 3/14/2002 -- <50 <0 50 -- - <br /> 6/28/2002 -- - - - _ _ w <br /> 9/11/2002 — <20 <0 5 <0 5 <05. 1 <0 5 — - <br /> Report Date January 18,2005 Page 4 of 8 <br />