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Ta*be <br /> 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 DIPE ETBE TAME DCA EDB Notes Oxygen DTW SPT WTE <br /> (TOC) NIL) <br /> ( 1L) (UCVQ (Finn-) [pg/L) (E��) (pg►L) hi L) (Pgk) (pg/L) (pg►L) ( IL) (mg L) (feet) (feet) (feet) <br /> MW-9 <br /> 25 23 07/30/04 <0 90 <0 90 <0 90 <0 90 <90 420 <5 0 <0 90 <0 90 <0 90 <0 90 <090 06 1031 000 1492 <br /> EX-1 08/12/04 <20 <20 <20 <20 <2,000 7,400 <200 <20 <20 22 - - -L - <br /> 23861 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 pg/L=micrograms per liter <br /> TBA=Tert-butanol DTW=Depth to water mglL=milligrams per liter <br /> DIPE=Diisopropyl 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 82606 <br /> a=Matnx 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 slightly high A fraction of MtSE(typically less than 1%)converts to TBA during the analysis of water samples 14ff considers this conversion <br /> effect to be mathematically significant in samples that contain MtBEITBA in rations of over 201 <br /> c=Hydrocarbons reported as TPHg do not exhibit a typical gasoline chromatographic pattern <br /> 17-Elevenl7-11 Stores1322621Tables132262 Current Groundwater xlsHistoncal Water Page 3 of 3 <br />