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e <br /> Table 2 <br /> Fuel Oxygenates Analytical Data <br /> ARCO Service Station No 6080 <br /> 85 E Louise Ave, Lathrop CA <br /> Well Date Ethanol TBA MtBE RIPE EtBE TAME 1,2-DCA EDB PCE Methanol <br /> Number Sampled "IL) (pglw (p91L) (pg/L) (pg1L) (pg/L) (pg/L) (pg1L) (pglL) (pg1L) Comments <br /> MW-3 3/22/2001 -- <200 <20 <2 0 <2 0 <2 0 <2 0 -- — <br /> 6/25/2001 -- <100 <20 <2 0 <2 0 <2 0 <2 0 -- — -- <br /> 9/24/2001 -- <200 <20 <2 0 <2 0 <2 0 <2 0 - — — <br /> 12/3/2001 — <5 0 16 <0 50 <0 50 <0 50 089 — -- -- <br /> 3/18/2002 -- <50 062 <0 50 <0 50 <0 50 05 -- -- <br /> 6120l2002 -- <5 0 056 <0 50 <0 50 <0 50 054 — - — <br /> 9/9/2002 -- <5 055 <0 50 <0 50 <0 50 <0 50 -- — — <br /> 12/6/2002 -- <20 18 <0 50 <0 50 <0 50 <0 50 -- — — <br /> 03/14/2003 <100 <20 <0 50 <0 50 <0 50 <0 50 076 — -- — <br /> 06/06/2003 <100 <20 <0 50 <1 00 <1 00 <1 00 <0 50 — — -- <br /> 09/15/2003 <100 <20 <0 50 <1 00 <1 00 <1 00 <0 50 -- -- <br /> 12/04/2003 <100 <20 <0 50 <1 00 <1 00 <1 00 <0 50 — -- — <br /> 03/05/2004 <100 1 <20 1 <0 50 1 <1 00 1 <1 00 <1 00 <0 50 -- -- <br /> TBA=Tert-butyl alcohol <br /> MtBE=Methyi tent-butyl ether <br /> DIPE=Di-isopropyl ether <br /> EtBE=Ethyl tert-butyl ether <br /> TAME=Tert-amyl methyl ether <br /> 1,2-DCA=1,2-Dichloroethane <br /> EDB=Ethylene dibromide <br /> PCE=Tetrachloroethene <br /> pg1L=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 concentration 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 /> NJ=The analysis indicates the presence of an analyte that has been tentatively identified and the associated numerical value represents its approximate concentration <br /> UJ=The analyte was not detected above the reported sample reporting limit However,the reported reporting limit is approximate and mayor may not represent the actual limit of quantitation <br /> necessary to accurately and precisely measure the analyte in the sample <br /> R=The sample results are refected due to identification or other analytical issues <br /> ND=Not detected above reported detection limit <br /> Report Date April 12, 2004 Page 2 of 2 <br />