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Table 2 <br /> Fuel Oxygenates Analytical Data <br /> ARCO Service Station#6020 <br /> 1711 E Yosemite, Manteca CA <br /> Well Date Ethanol TBA MtBE DIPE EtBE TAME 1,2-DCA EDB PCE Methanol <br /> Number Sampled (991L) (pg/L) (pg1L) (pq/L) (pg/L) (pg/L) (pg/L) (jig/L) (/pg/L) (pg/L) Comments <br /> MW-10 9/11/2001 -- <200 <2 <2 <2 <2 <2 <2 — — <br /> 12/20/2001 — <20 <2 <2 <2 <2 <2 <2 — <br /> 3/20/2002 -- <5 <0 5 <05 <0 5 <0 5 <0 5 <05 — — <br /> 6/20/2002 — <5 <0 5 <05 <0 5 <0 5 <0 5 <05 -- — <br /> 9/24/2002 — <20 <0 5 <05 <0 5 <0 5 <0 5 <0 5 — — <br /> 11l2712002 — <20 <05 <0 5 <0 5 <0 5 <0 5 <05 — — <br /> 02/17/2003 <40 <20 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 - <br /> 04/28/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 <0 50 -- <br /> 07/28l2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 <0 50 — — <br /> 11126/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 -- -- <100 <br /> 0211612004 500 <20 <0 50 <1 0 <1 0 <1 0 <0 50 <0 50 -- <100 <br /> 03/1112004 <100 -- •- -- -- -- -- -- -- -- <br /> MW-11 07/28/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 <0 50 — -- <br /> 11/26/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 — -- <100 <br /> 02116/2004 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 <0 50 — <100 <br /> MW-12 07/28/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 <0 50 — — <br /> 11/26/2003 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 -- -- <100 <br /> 0211612004 <100 <20 <0 50 <1 0 <1 0 <1 0 <0 50 <0 50 -- <100 <br /> MW-13D 07/28/2003 <100 <20 78 <1 0 <1 0 <1 0 <0 50 <0 50 -- -- <br /> 11/26/2003 <100 <20 26 <1 0 <1 0 <1 0 <0 50 — — <100 <br /> 0211612004 <100 <20 27 <1 0 <1 0 <1 0 <0 50 <0 50 -- <100 <br /> TBA=Tert-butyl alcohol <br /> MtBE=Methyl tert-butyl ether <br /> DIPE=DF-isopropyl ether <br /> ELBE=Ethyl tent-butyl ether <br /> TAME=Tert-amyl methyl ether <br /> 1,2-DCA=1,2-Dichloroethane <br /> EDB=Ethylene dibromide <br /> PCE=Tetrachloroethene <br /> ,uglL=micrograms per liter <br /> <=below given laboratory detection limit <br /> —=not measured or analyzed <br /> Data Qualifier Definitions <br /> U=The analyte was analyzed for,but was not detected above the sample reporting limit <br /> J=The analyte was positively identified,the associated numerical value is the approximate conoentration of the analyte in the sample <br /> N=The analysis indicates the presence of an analyte for which there is presumptive evidence to make a tentative identification <br /> Report Date Apn!16,2004 Page 3 of 4 <br />