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Table 2 Fuel Oxygenates Analytical Data Former ARCO Service Station No 4493 205 N Center Street, Stockton, CA Well Date Ethanol TBA MtBE DIPE ELBE TAME 1,2-DCA EDB PCE Methanol Number Sampled (l g/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg1L) (uglL) (ug1L) (pg/L) (pg/L) Comments MW-10D 12/23/2003 <100 <20 <10 <10 <10 <10 <10 <10 <10 — 03/08/2004 <100 <20 <10 <10 <10 <10 <10 <10 <10 - MW-10M 6/12/2002 — <5 0 58 <0 5 <0 5 <0 5 <0 5 <0 5 — -- 9/16/2002 — <40 26 <1 0 <1 0 <1 0 <1 0 <1 0 — -- 12/5/2002 <80 <40 <10 <10 <10 <10 <10 <10 03/14/2003 <100 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 -- 06/09/2003 <100 <20 <10 <10 <10 <10 <10 <10 <10 — 09/25/2003 <100 <20 <10 <10 <10 <10 <10 <10 <10 12/23/2003 <100 <20 <10 <10 <10 <10 <10 <10 <10 -- 03108/2004 <100 <20 <10 <10 <10 <10 <10 <10 <10 MW-11D 12/5/2002 <40 <20 22 <0 5 <0 5 <05 <0 5 <05 — — 03/14/2003 <100 <20 35 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 — 06/09/2003 <100 <20 13 <10 <10 <10 <10 <10 <10 — 091255/2003 <100 <20 <10 <10 <10 <10 <10 <10 <10 - 12/23/2003 <100 <20 19 <10 <10 <10 <10 <10 <10 — 03/08/2004 <100 <20 14 <10 <10 <10 <10 <10 <10 — MW-11M 12/5/2002 <80 <40 55 <10 <10 <10 <10 <10 —03114/2003 <200 <40 110 <10 <10 <10 <10 <10 <10 -- 06/09/2003 <500 <100 130 <50 <5 0 <5 0 <5 0 <50 <5 0 — 09/25/2003 <500 <100 150 <5 0 <5 0 <5 0 <5 0 <50 <5 0 -- 12/23/2003 <100 <20 100 <1 0 <1 0 <1 0 <1 a <1 0 <1 0 — 03108/2004 <500 <100 70 <50 <5 0 <5 0 <5 0 <5 0 <5 0 — MW-12D 12/24/2003 <100 <20 22 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 — 03/08112004 <100 <20 15 <10 <10 <10 <10 <10 <10 — TBA=Tert-butyl alcohol DIPS=Di-isopropyl ether EtBE=Ethyl tert-butyl ether MtBE=Methyl tert-butyl ether TAME=Tert-amyl methyl ether 1,2-DCA=1,2-Dichloroethane EDB=1,2-Dibromoethane PCE=Tetrachloroethene uglL=micrograms per liter <=below given laboratory detection limit —=not measured or not analyzed Report Date May 10,2004 Page 5 of 6