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Table 1 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#32262 <br /> 2360 West Grant Line Road <br /> Tracy CA <br /> Well ID/ Ethyl- 1,2- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg MtBE TBA DIPE ETBE TAME DCA EDB [NO <br /> tes Oxygen DTW SPT WTE <br /> (roc) (p fL) (p ) (pgn) (pgfL) (pglL) WIL) (pg►L) (pgn.) pg/L) (p ) t fL) Ilf n) (m !i_) (feet) (feet) (feet) <br /> EX-1 <br /> 2386 08/12/04 <20 <20 <20 <20 <2,000 7,400 <200 <20 <20 22 -- -- -- -- -- -- <br /> 08/13/04 <10 <10 <10 <10 <1,000 5,400 <100 <10 <10 10 <br /> 09/12/05 <0 90 <0 90 <0 90 <0 90 <90 360 <50 <0 90 <0 90 <0 90 -- -- — 775 -- -- <br /> 09/16/05 <2 0 <2 0 <2 0 <2 0 510 1,100 <90 <2 0 <2 0 <2 0 -- -- c — -- <br /> MW-5(V) <br /> 22 64 10/28/05 <0 50 <0 50 <0 50 <0 50 <50 1 1 <50 <0 50 <0 50 <0 50 <0 50 <0 50 23 744 000 1540 <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-Dtbromoethane pglL=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-amyt-methyl ether <br /> Notes <br /> Samples analyzed using EPA Method 8260B <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 MtSEfft3A in rations of over 20 1 <br /> c=Hydrocarbons reported as TPHg do not exhibit a typical gasoline chromatographic pattern <br /> Id=Matrix SpikelMatnx Spike Duplicate Results for the analyte Benzene were affected by the analyte concentrations already present in the un spiked sample <br /> 117-Elevenl7-1 i Stores%322621Tables132262 Current Groundwater xlsHistoncal Water Page 5 of 5 <br />