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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 4191L) (pg1L) Wfl-) (ug1L) (pq/L) (pg1L) (pg/L) (pg1L) Comments VW-5 03/06/2003 <2,000 <400 51 091 <10 <10 660 -- 0611112003 <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 <400 <20 <0 50 <1 0 <1 0 <1 0 48 <100 03/08/2004 <100 1 <20 1 <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 09/2012004 <1,000 <200 <5 0 <10 <10 <10 140 — VW-6 03106/2003 — -- — -- -- — 12/10/2003 — - -- -- — — -- -- Well Dry 03/0812004 — -- — — — — -- Well Dry 06!23!2004 -- -- -- — - -- -- — Well Dry,Not Sampled 09/20/2004 — — — — — -- — — Well Dry,Not Sampled VW-7 12/19/2002 NA 7-7--7 11 <0 50 <0 50 <0 50 — -- 03/06/2003 <100 83 11 <5 0 <5 0 <5 0 320 -- <100 <1 0 <1 0<20 054 <1 0 -- 06/91l2003 — 09/24/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 -- — 12/10/2003 <500 <100 91 <5 0 <5 0 <5 0 160 <100 03/08/2004 <500 <100 6 3 <5 0 <50 <50 64 <100 06/24/2004 <100 <20 1 1 <0 50 <0 50 <0 50 16 <100 0912012004 <100 <20 12 <10 <10 <10 20 — VW-8 12/19/2002 NA <10 <10 <10 <10 <10 — 03/06/2003 <500 <20 10 <2 5 <2 5 <25 60 — 06/11/2003 <500 <100 <2 5 <5 0 <5 0 <5 0 — — 09/24/2003 <1,000 <200 <50 <10 <10 <10 — — 12/10/2003 <100 <20 49 <1 0 <1 0 <1 0 19 <100 03/08/2004 <500 <100 <2 5 <5 0 <5 0 <5 0 <2 5 <200 06/24/2004 <500 <100 28 <2 5 <2 5 <2 5 300 <100 0912012004 <10,000 <2,000 <50 <100 <100 <100 <50 — VW-9 03/06/2003 -- -- -- — — -- 12/10/2003 -- -- -- -- _ _ — -- Well Dry 03/08/2004 — — — — -- - — -- Well Dry 06/23/2004 — -- -- -- — — -- Well Dry,Not Sampled Page 10 of 12 Report Date October 25,2004