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Table 2 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#32262 <br /> 2360 West Grant tine Road <br /> Tracy CA <br /> Well IDI Ethyl- 1,2- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg MtBE TBA RIPE ETBE TAME DCA EDB Notes Oxygen DTW SPT WTE <br /> {TOC} ( !L) (pg/L) ( 1L) (pgn-1 (PgfL) (pgIL) (pg/L) (p9IL) (pg[L) (trgg/L) (pglL) (p IL) (m j (feet) (feet) (feet) <br /> MW-6D <br /> 24 86 10/30/03 <0 50 <0 50 <0 50 <0 50 <50 270 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 08 685 000 1801 <br /> 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 /> ExEx lunation <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 pg/L=micrograms per liter <br /> TBA=Tert-butanol DTW=Depth to water mg1L=milligrams per liter <br /> DIPE=Dusopropyl ether SPT=Separate-phase hydrocarbon thickness —=Not sampled/not measured <br /> EtBE=Ethyl-tert-butyl ether WTE=Water table elevation <br /> TAME=Teri-amyl-methyl ether <br /> Notes <br /> Samples analyzed using EPA Method 82606 <br /> a=Matrix SpLke]Matnx 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 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 MtBEITBA in rations of over 20 1 <br /> I <br /> i <br /> 117-ElevenV-11 Stores1322621TablesQ2262 04-1 Q xlsHistoncal Water Page 2 of 2 <br />