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• TabTe 2 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7 Eleven Store#32262 <br /> 2360 West Grant Line Road <br /> Tracy CA <br /> Well iDI Ethyl- 1,2- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg MtBE TBA DIPS ETRE TAME DCA EDB Notes Oxygen DTW SPT WTE <br /> [TOC) OVL1 Ipg�L) {N n} [N9n) Ip9�L) [Pg�I Epg►L} (Ug L) !Pg►L} [4r9�-? Ip9fE) Ip A} (tngfL} {feet) (feet} (feet) <br /> MW-9 <br /> 2523 07/30/04 <0 90 <0 90 <0 90 <0 90 <90 420 <5 0 <0 90 <0 90 <0 g0 <0 90 <0 90 06 1031 000 1492 <br /> EX-1 08/12/04 <20 <20 <20 <20 <2,000 7,400 <200 <20 <20 22 <br /> 2386 08/13/04 <10 <10 <10 <10 <1,000 5,400 <100 <10 <10 10 - -- - _ <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 pglL=micrograms per liter <br /> TBA=Tert butanol DTW=Depth to water mglL=milligrams per liter <br /> DIPE=Dnsopropyl ether SPT=Separate-phase hydrocarbon thickness =Not sampledlnot measured <br /> EtBE=Ethyl-tert-butyl ether WTE=Water table elevation <br /> TAME=Ted amyl methyl ether <br /> Notes <br /> Samples analyzed using EPA Method 6260E <br /> a=Matrix SpikelMatnx Spike Duplicate Results for the analyte MtBE were affected by the analyte concentrations already present in the un-spiked sample <br /> b=TBA results maybe biased slighfly high A fraction of MtSE(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 MtBErrBA in rations of over 20 1 <br /> c=Hydrocarbons reported as TPHg do not exhibit a typical gasoline chromatographic pattern <br /> I <br /> 117-Elevenl7 11 StoreM322621Tables132262 Current Groundwater AsHistoncal Water Page 3 of 3 <br />