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Table 2 Fuel Oxygenates Analytical Data ARCO Service Station No 2130 7906 N EL Dorado Street, Stockton, CA Well Date Ethanol TBA MtBE DIPE EtBE TAME 1,2-DCA Methanol Number Sampled (pg1L) (pg1L) (pg1L) (pg1L) (pg1L) (pg1L) (pg/L) g/L) i Comments VW-7 06/24/2004 <100 <20 1 1 <0 50 <0 50 <0 50 16 <100 VW-8 12/19/2002 NA <10 <10 <10 <10 <10 — -- 03/06/2003 <500 <20 10 <2 5 <25 <2 5 60 - 06/11/2003 <500 <100 <25 <5 0 <50 <50 — - 09/24/2003 <1,000 <200 <50 <10 <10 <10 -- -- 12/1 G/2003 I <100 <20 49 <1 0 <1 0 <1 0 19 <100 03/08/2004 <500 <100 <2 5 <50 <5 0 <50 <2 5 <200 06/24/2004 <500 <100 28 <2 5 <2 5 <2 5 300 <100 VW-9 03/06/2003 — -- — -- -- — -- -- 12/10/2003 — — -- - — — - — Well Dry 03/08/2004 - -- — -- — - — -- Well Dry 06/23/2004 -- — — -- -- -- — Well Dry,Not Sampled VW-10 12/19/2002 NA <100 <10 <10 <10 <10 -- -- 03/06/2003 <10,000 <2,000 <50 <50 <50 <50 <50 -- 06/11/2003 <5,000 <1,000 <25 <50 <50 <50 -- — 09/24/2003 <1,000 <20o <5 0 <10 <10 <10 -- -- 12/10/2003 <1,000 <200 <5 0 <10 <10 <10 97 <100 03/08/2004 <500 <100 <2 5 <50 <5 0 <5 0 <2 5 <100 06124/2004 <500 I <100 28 <2 5 <2 5 <2 5 290 <100 VW-11 12/19/2002 NA <50 098 <0 50 <0 50 <0 50 — -- 03/06/2003 <100 <20 <0 50 <0 50 <0 50 <0 50 27 -- 06/11/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 — -- 09/24/2003 <100 <20 80 <1 0 <1 0 <1 0 — -- 12/10/2003 <100 34 12 <1 0 <1 0 <1 0 23 <100 03/08/2004 <100 <20 20 J <1 0 <1 0 <1 0 1 31 <500 06123/2004_j <100 1 <20 1 <0 50 1 <0 50 <0 50 <0 50 <0 50 <100 VW-12 12/19/2002 NA <200 26 <0 50 <0 50 <0 50 -- -- 03/06/2003 <100 <20 098 <0 50 <0 50 <0 50 310 — 06/11/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 — -- 09/24/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 — -- 12/10/2003 <500 <100 95 <50 <5 0 <5 0 150 <100 03/08/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 29 <100 Report Date August 4,2004 Page 10 of 12