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•_ � i ' Table 2 Fuel Oxygenates Analytical Data ARCO Service Station No 2130 7906 N EL Dorado Street, Stockton, CA Well Date Ethanol TBA MtBE DIP E EtBE TAME 1,2•DCA Methanol Number Sampled (pg1L) (E►g!L) (ErgtL) (pg/L) (Erg/L) (Erg/L) (prg[L) (.uglL) Comments VW-2 06/2412004 <100 <20 1 0 <0 50 <0 50 <0 5o 16 <100 VW-3 12/19/2002 NA <0 50 -- —<0 50 <0 50 <0 50 -- — 03/06/2003 <100 <20 14 <0 50 <0 50 <0 50 13 06111/2003 <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 03/08/2004 <100 <20 19 J <1 0 <1 0 <1 0 13 J <1,500 06124/2004 1 <100 1 <20 1 <0 50 <0 50 <0 50 <0 50 <0 50 <100 VW-4 12/19/2002 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 — -- 12/10/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 12 <100 03/08/2004 <100 <20 46 <1 0 <1 0 <1 0 <0 50 <100 06/24/2004 <100 <20 <0 50 <0 50 <0 50 <0 5o 51 <100 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 -- -- 12/10/2003 <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 31 <100 06124/2004 <500 <100 <2 5 <2 5 <2 5 <2 5 220 <100 VW-6 03/06/2003 -- -- -- -- -- — — -- 12/10/2003 — — — -- — -- — -- Well Dry 03/08/2004 — - — — — — -- Well Dry 06/23/2004 -- — — -- -- -- -• Well Dry,Not Sampled VW-7 12/19/2002 NA 77 11 <0 50 <0 50 <0 50 1 -- - 03/06/2003 <100 83 11 <50 <5 0 <5 0 320 06111/2003 <100 <20 054 <1 0 <1 0 <1 0 -- - 09/24/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 - — 12/10/2003 <500 <100 91 <5 0 <50 <5 0 160 <100 03/08/2004 <500 <100 63 <5 0 <5 0 <5 0 64 <100 Report Date August 4,2004 Page 9 of 12