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Table 2 Fuel Oxygenates Analytical Data ARCO Service Station No 2186 3212 N California, Stockton, CA Well Date Ethanol TBA MtBE DIPE EtBE TAME 1,2-DCA EDB Methanol Number Sampled (pglL) (pg/L) (pglL) {1rg1L) (pg1L) (pg/L) (pgll-) (pg/L) (pg/L) Comments MW-7 3/14/2002 -- <50 <0 50 <0 50 <0 50 <0 50 — — -- No FP,No S 6/19/2002 — <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 — -- No FP,No S 9/12/2002 <40 <5 <0 5 <05 <0 5 <0 5 <0 5 <0 5 -- No FP,No S 12!3/2002 — <50 <05 <05 <0 5 <0 5 <0 5 -- No FP,No S 03/11/2003 <100 <20 <0 50 <0 50 <0 50 <0 50 <0 50 — — 06/09/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 — - 09/17/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 — -- 12/11/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 -- — 03/10/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 — — 06/1712004 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 -- <100 MW-8 10611712004 1 <100 1 <20 13 <1 0 VW-1A 03/11/2003 -- -- - _ _ _ _ — — Well Dry 06/09/2003 — — — -- _ _ _ _ _ Well Dry 09/17/2003 -- -- -- -- — - -- - -- Well Dry 12/1112003 -- -- — - — -- — -- -- Not Sampled 03/10/2004 — — -- — — — -- - Not Sampled 06/17/2004 — — — -- -- -- -- -- Not Sampled,Well Dry VW-1 B 3116/2001 — <200 21 <20 <2 0 <20 — - -- No FP No S 6/21/2001 — <100 94 <20 <2 0 <20 -- — -- No FP,No S 12111/2001 — 170 9,700 <2 0 24 12 -- - -- No FP,No S 3/14/2002 -- <5 0 63 <0 50 <0 50 <0 50 -- — -- No FP No S 6/19/2002 -- <50 320 <0 50 <0 50 1 5 16 -- — No FP,No S 9/12/2002 <800 <100 590 <10 <10 <10 33 <10 — No FP,No S 12/3/2002 -- <400 260 <10 <10 <10 <10 -- -- No FP,No S 03/1112003 <10,000 <2,000 2 400 J <50 <50 <50 <50 - — 06/09/2003 <25,000 <5 000 860 <250 <250 <250 <120 - — 09/17/2003 <2,500 <500 540 <25 <25 <25 <12 - -- 12l1112003 <1,000 <200 130 <10 <10 <10 <50 03/10/2004 <10,000 <2,000 2,000 <100 <100 <100 <50 —06117/2004 <2,000 <400 620 <20 <20 <20 <10 — <100 1 VW-2A 03111!2003 -- -- -- -- — -- — -- -- Not Sampled 06/09/2003 -- — - -- - -- - — Well Dry Report Date August 2,2004 Page 5 of 8