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Table 2 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Stare#32262 <br /> 2360 West Grant Line Road <br /> Tracy CA <br /> Well ID! Ethyl- LDCA <br /> Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg MtBE TBA DIPE ETBE TAME EDB Notes Oxygen DTW SPT WTE <br /> (TOC) (p 1L) (pgn) WWI-) (Pg�) (Pg L) (Ng'L) ftigM (pgIL) (pg/L) (pg/L) LWLI (feet) <br /> MW-6D <br /> 2486 10/30/03 <0 50 <0 50 <0 50 <0 50 <50 270 <50 <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 <50 <0 50 <0 50 <0 50 <0 50 <0 50 58 644 000 1842 <br /> 04/26/04 <0 50 <0 50 <0 50 <0 50 <50 25 <5 0 <0 50 <0 50 <0 50 <0 50 <0 50 79 672 000 1814 <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 pg/L=micrograms per liter <br /> TBA=Tert-butanol DTW=Depth to water mgtL=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=Tert-amyl-methyl ether <br /> Notes <br /> Samples analyzed using EPA Method 8260E <br /> a=Matrix Spike/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 MtBEIfBA in rations of over 201 <br /> 147-ElevenV-11 StoreM32262Uables132262 04-20 AsHistorical Water Page 2 of 2 <br />