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• • i Table 2 Fuel Oxygenates Analytical Data ARCO Service Station No. 548 1612 W. Hammer Lane, Stockton, CA Well Date Ethanol TBA MtBE DIPS EtBE TAME 1,2-DCA Number Sampled (pg/L) (pglL) (,ugll-) (pg/L) (pg/L) (pg/L) (pg1L) Comments VW-3 09/18/2003 <1,000 <200 <5.0 <10 <10 <10 9.6 12/08/2003 <2,000 <400 <10 <20 <20 <20 <10 03/11/2004 <2,000 <400 <10 <20 <20 <20 <10 06/1112004 <100 33 1.5 <0.50 <0.50 <0.50 1.5 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 <1.0 <1.0 <1.0 1.1 03/11/2004 <100 <20 <0.50 <1.0 <1.0 <1.0 <0.50 06/11/2004 <100 <20 1.1 <0.50 <0.50 <0.50 0.85 VW-5D 12/13/2001 - <50[3] 67[3] <5.0[3] <5.0[3] <5.0[3] 83[3] 3/12/2002 -- 890 <2.5[3] <2.5[3] <2.5[3] <2.5[3] <2.5[3] 9/9/2002 - 290 <5 <5 <5 <5 <5 12/4/2002 - <4,000 <100 <100 <100 <100 <100 03/03/2003 <1,000 <200 <5.0 <5A <5.0 <5.0 <5.0 06/03/2003 <200 <40 <1.0 <2.0 <2.0 <2.0 <1.0 09/18/2003 - - - - - - - Well dry 12/08/2003 - -- -- -- - - -- Dry,Not Sampled 03/11/2004 <20,000 <4,000 <100 <200 <200 <200 <100 05/03/2004 <10,000 <2,000 <50 <100 <100 <100 <50 06/11/2004 <1,000 <200 <5.0 <5.0 <5.0 <5.0 <5.0 VW-5S 3/12/2002 - <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 9/9/2002 - <5 <0.5 <0.5 <0.5 <0.5 <0.5 12/4/2002 - <20 <0.5 <0.5 <0.5 <0.5 <0.5 03/03/2003 <100 <20 <0.50 <0.50 <0.50 <0.50 <0.50 06/03/2003 <100 <20 <0.50 <1.0 <1.0 <1.0 <0.50 09/18/2003 -- - - - - - -- Well dry 12/08/2003 -- - - - -- -- -- Not Sampled,Dry 03/11/2004 <20,000 4,000 <100 <200 <200 <200 <100 Report Date:July 26,2004 Page 5 of 7