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02 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7 Eleven Store 814117 <br /> 2725 Country Club Boulevard <br /> Stockton CA <br /> Well IDI Ethyl- MtBE LI,2_ Meth- Eth- Ace- Dissolved <br /> Elevation Date Benzene Toluene Benzeila Xylene TPHg 8020 MtBE TBA DIPE EtBE TAME EDB anol anot tone Notes OxygenTOC L L /L L 1L L IL !L IL L L L 1L !L m !L feat feet feet <br /> Exalanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Ten amyl methyl ether TOC=Top of casing elevation in feet above mean sea level <br /> MtBE=Methyl4ert butyl ether 12 DCA=12 dichtoroethane pg1L=micrograms per liter <br /> TBA=Ted Butanol EDB=1 2-dibromoethane mg1L=milligrams per liter <br /> DIPE=Dosopropyi ether DTW=Depth to water —=Not sampledlnot measured <br /> E1BE=EOryk-tert butyl ether SPT=Separate-phase hydrocarbon thickness <br /> WTE=Water table elevation <br /> Notes <br /> Histoncal data pnor to 03/17/03 sample date provided by Shaw E&I BTEX TPHg and MtBE analyzed using EPA Method 8020/8015 Modified <br /> Samples analyzed by EPA Method 82608 starting with 03!17103 sample date <br /> a=Method Blank Contamination The associated method blank contains the target analyte ata reportable level <br /> b=Mawr SpikefMatnx Spike Duplicate for the analytes Benzene MtBE was affected by the analyte concentrations already present in the un-spiked sample <br /> c=The Method Reporting Limit for Acetone has been increased due to the presence of an interfering compound <br /> d=Matrix Spike/Matnx Spike Duplicate Results for the analyte MtBE were affected by the analyte concentrations already present in the un-spiked sample <br /> e=Hydrocarbons reported as TPHg do not exhibd a typical Gasoline chromatographic pattern <br /> f=Matrix S rkelMatruc Spike Duplicate Results for the ana a Benzene were affected by the anatyte concentrations already present in the un spiked sample <br /> 147 Elevenl7-11 Stores1141171Tables114117 Current Groundwater xlsHistoncai Water Page 7 of 7 <br />