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! i i 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 W91L) (pg1L) (411L) (pg/L) (pg/L) (pg1L) (1rg1L) (pg/L) Comments VW-3 03/08/2004 <100 <20 19 J <1 0 <1 0 <1 0 1 3J <1,500 06/24/2004 <100 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <100 09/20/2004 <100 <20 44 <1 0 <1 0 <1 0 082 — 12/2012004 <100 <20 069 1 <1 0 1 <1 0 1 <1 0 14 -- VW-4 12/1912002 NA <0 50 <0 50 <0 50 <0 50 <0 50 — - 03/06/2003 <100 <20 <0 50 <0 50 <0 50 <0 50 15 -- 06/11/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 -- - 09/24/2003 <100 <20 45 <1 0 <1 0 <1 0 — -- 1211012003 <100 <20 <0 50 <1 0 <1 0 <1 0 1 2 <100 03/08/2004 <100 <20 46 <1 0 <1 0 <1 0 <0 50 1 <100 06/24/2004 <100 <20 <0 50 <0 50 <0 50 <0 50 51 <100 09/20/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 29 -- 12/20/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 56 -- VW-5 12/19/2002 NA 16 6 067 <0 50 <0 50 — -- 03/06/2003 <2,000 <400 51 091 <10 <10 660 — 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 -- -- 12110/2003 - 1211012003 <100 <20 <0 50 <1 0 <1 0 <1 0 48 <100 03/08/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 31 <100 06/24/2004 <500 <100 <2 5 <2 5 <2 5 <2 5 220 <100 09/20/2004 <1,000 <200 <5 0 <10 <10 <10 140 -- 12/21/2004 <500 I <100 1 38 1 <50 <5 0 <60 620 J VW-6 03/06/2003 -- — — — — — -- -- 12/10/2003 — -- -- -- — -- — — Well Dry 03/08/2004 — — — -- — -- -- -- Well Dry 06/23/2004 -- - — — -- — — -- Well Dry,Not Sampled 09/20/2004 -- _ _ — _ _ — -- Well Dry,Not Sampled 12/20/2004 -- — -- -- -- -- — Not Sampled,Well Dry VW-7 12/19/2002 NA 77 11 <0 50 <0 50 <0 50 — — 03/06/2003 <100 83 11 <5 0 <5 0 <5 0 320 06/1112003 <100 <20 0 54 <1 0 <1 0 <1 0 -- — 09/24/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 -- Report Date January 31,2005 Page 10 of 13