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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 (pglL) (ugll-) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) Comments INW-10 3/15/2001 — -- — — -- — — — Well Covered 6/20/2001 NA <100 <2 <2 <2 <2 -- - 9/12/2001 — -- -- — — — -- — Well Covered 12/12/2001 -- — — — — - — -- Well Covered 3/13/2002 -- — - -- — — — — Well Covered 6/18/2002 — — -- -- — — — -- Well Covered 9/11/2002 -- — -- — - — -- Well Covered 12/18/2002 — -- — — — — — -- Well Covered 06/11/2003 — — — — — — — — Well Covered 09/25/2003 — — — — -- — -- Well Destroyed VW-1 12/19/2002 NA 45 64 <0 50 <0 50 <0 50 — — 03/06/2003 <100 34 25 <0 50 <0 50 <0 50 18 — 06/11/2003 <100 <20 84 <1 0 <1 0 <1 0 — — 09/24/2003 <100 <20 87 <1 0 <1 0 <1 0 — — 12/10/2003 <100 37 13 <1 0 <1 0 <1 0 35 <100 03/08/2004 <100 <20 1191 <1 0 <1 0 <1 0 1 3J <1,500 UJ 06/24/2004 <1,000 <200 <5 0 <5 0 <5 0 <5 0 470 <100 09/20/2004 <5,000 <1,000 27 <50 <50 <50 <25 — 12/20/2004 <100 <20 13 <1 0 1 <1 0 <1 0 23 VW-2 12/19/2002 NA <0 50 <0 50 054 <0 50 <0 50 — -- 03/06/2003 <100 <20 <0 50 <0 50 <0 50 <0 50 22 - 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 <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 28 <100 06/24/2004 <100 <20 1 0 <0 50 <0 50 <0 50 16 <100 09/20/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 32 — 12/21/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 25 -- VW-3 12/19/2002 NA <0 50 89 <0 50 <0 50 <0 50 — — 03/06/2003 <100 <20 14 <0 50 <0 50 <0 50 13 -- 06/11/2003 <100 <20 26 <1 0 <1 0 <1 0 — - 09/24/2003 <100 <20 54 <1 0 <1 0 <1 0 — — 12/10/2003 <100 <20 50 <1 0 <1 0 <1 0 20 <100 Report Date January31,2005 Page 9 of 13