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Table 2 Fuel Oxygenates Analytical Data ARCO Service Station No. 548 1612 W. Hammer lane, Stockton, CA Well Date Ethanol TBA MtBE DIPE EtBE TAME 1,2-DCA EDB PCE Methanol Number Sampled (pg/L) (pglL) (pg1L) (pg/L) Lig/L) (ug/L) (ug/L) (NgIL) U41-) (pg/L) Comments VW-1 9/9/2002 - 16 60 <0.5 <0.5 <0.5 2.2 -- -- 12/4/2002 - 60 97 <0.5 <0.5 <0.5 5.8 - - - 03/03/2003 <200 <40 30 <1.0 <1.0 <1.0 2.6 - - - 06/03/2003 <100 <20 22 <1.0 <1.0 <1.0 1.6 - -- -- 09/18/2003 <500 <100 120 <5.0 <5.0 <5.0 <2.5 - - - 12/08/2003 <1,000 <200 120 <10 <10 <10 <5.0 - -- - 03/11/2004 - - - -- - - - - - - Not Sampled 05/03/2004 <100 <20 4.1 <1.0 0.0 <1.0 <0.50 - - - VW-2 12/13/2001 - 32 1.5 <0.50 <0.50 <0.50 28 -- - - 3/12/2002 -- <5.0 <0.50 <0.50 <0.50 <0.50 0.8 -- - -- 9/9/2002 - 17 4.4 <0,5 <0.5 <0.5 12 - - - 12/4/2002 -- 100 5.4 <0.5 <0.5 <0.5 50 - -- - 03/03/2003 <200 <40 <1.0 <1.0 <1.0 <1.0 23 - - -- 06/03/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 14 -- - - 09/18/2003 <1,000 <200 <5.0 <10 <10 <10 30 - - 12/08/2003 <1,000 <200 5.0 <10 <10 <10 40 -- - - 03/11/2004 <1,000 240 <5.0 <10 <10 <10 42 - - VW-3 12/13/2001 - 59 16 <0.50 <0.50 <0.50 8.2 - - - 3/12/2002 -- <5.0 0.72 <0.50 <0.50 <0.50 2.5 -- -- -- 9/9/2002 - 6.3 1.6 <0.5 <0.5 <0.5 4.4 - - - 12/4/2002 -- <20 4.6 <0.5 <0.5 <0.5 21 - -- -- 03/03/2003 <100 39 3.6 <0.50 <0.50 <0.50 4.3 -- - - 06/03/2003 <100 22 2.7 <1.0 <1.0 0.0 2.1 - -- - 09/18/2003 0,000 <200 <5.0 <10 <10 <10 9.6 - - .- 1210812003 <2,000 <400 <10 <20 <20 <20 <10 -- -- - 03/1112004 <2,000 <400 <10 <20 <20 <20 <10 - -- - VW-4 12/13/2001 -- <5.0 100 <0.50 <0.50 <0.50 12 - - - 3/12/2002 - <5.0 32 <0.50 <0.50 <0.50 5.3 -- - - 9/9/2002 -- <5 110 <0.5 <0.5 <0.5 5.9 - - -- 12/4/2002 - <20 39 <0.5 <0.5 <0.5 2.8 - - -- 03/03/2003 <100 <20 0.88 <0.50 <0.50 <0.50 <0.50 - -- - 06/03/2003 <100 <20 0.95 <1.0 <1.0 <1.0 <0.50 - -- - 09/18/2003 <100 <20 50 <1.0 <1.0 <1.0 2.9 - - -- 12/08/2003 <100 <20 6.4 0.0 <1.0 <1.0 1.1 - -- Report Date:May 17,2004 Page 4 of 6