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Ta�Te 1 <br /> First Quarter 2004 Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#32262 <br /> 2360 West Grant Line Road <br /> Tracy CA <br /> L <br /> DI Ethyl- 1,2- Dissolveton Date Benzene Toluene Benzene Xylene TPHg MtBE TBA DIPE EtBE TAME DCA EDB Notes Oxygen DTW SPT WTE <br /> ) tN 1L) !L to 1L) ti► 1L) p !L {p 1L) (p } 1L ti! L) (N IL) (N m Il feet} feet) (feet) <br /> MW-1 01/14/04 <0 50 <0 50 <0 50 <0 50 <50 <0 50 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 12 876 000 1701 <br /> 2577 <br /> MW-2 01114/04 <2 5 <2 5 <2 5 <2 5 <250 1,300 <25 <2 5 <2 5 31 <2 5 <2 5 06 877 000 1655 <br /> 2532 <br /> MW-3 01/14/04 <0 50 <0 50 <0 50 <0 50 <50 46 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 08 835 000 1674 <br /> 2509 <br /> MWA 01/14/04 <0 50 <0 50 <0 50 <0 50 <50 14 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 1 1 734 000 1643 <br /> 2377 <br /> MW-5 01/14/04 <200 <200 <200 <200 <20,000 110,000 2,500 <200 <200 210 <200 <200 b 05 772 000 1616 <br /> 2388 <br /> MW-6D 01/14/04 <0 50 <0 50 <0 50 <0 50 <50 110 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 58 644 000 1842 <br /> 24 86 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline 1 2-DCA=1 2-Dichloroethane TOC=Top of casing elevation in feet above mean sea level <br /> MtBE=Methyl-tert-butyl ether EDB=1 2-Dibromoethane lig/L=micrograms per liter <br /> TBA=Tert-butanol DTW=Depth to water mg1L=milligrams per liter <br /> DIPE=Dnsopropyl ether SPT=Separate-phase hydrocarbon thickness <br /> EtBE=Ethyl-tert-butyl ether WTE=Water table elevation <br /> TAME=Tert-amyl-methyl ether <br /> Notes <br /> Samples analyzed using EPA Method 82606 <br /> b=TBA results maybe biased slightly high A fraction of MtBE(typically less than 1%)converts to TBA during the analysis of water samples Kiff considers this conversion <br /> effect to be mathematically significant in samples that contain MtBE1TBA in rations of over 20 1 <br /> 117-Elevenl7-11 Stores1322621Tablesl32262 04-1 Q AsWater Page 1 of 1 <br />