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. Tie • Historical Groundwater Monitoring and Analytical Data 7-Eleven Store#14117 2725 Gauntry Club Boulevard Stockton CA WelllDlEthyl- MtBE 1,2- Meth- Eth Ace- Dtssoh+hitt Elevation Hate Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPE EtBE TAME DCA EDB anol anol tone Notes ?xjigen DTW` SPT WTE TOC fL L L L L IL L !L !L L 1L L L 1L !L m 1L feet feet feet Explanation TPHg a Total petroleum hydrocarbons-as-gasoline TAME=Tert amyl-methyl ether TQC=Top of casing elevation in feet above mean sea level MtBE=Methyl-cert butyl ether 12 DCA=1 2-drxhloroethane pg1L=micrograms per Iden TBA=Tart Butanol EDB a 1 2 dibromoethane mg1L=milligrams per liter DIPE=Dusopropyl ether DTW=Depth to water =Not sampledlnat measured E1BE=Elhyl-tert butyl ether SPT=Separate-phase hydrocarbon thickness WTE=Water table elevation Notes Historical data prior to 03117/03 sample date provided by Shaw E&l BTEX TPHg and MtBE analyzed using EPA Method 802018015 Modified Samples analyzed by EPA Method 826013 starting with 03/17/03 sample date am Method Blank Contamination The associated method blank contains the target analyte at a reportable level b=Matrix Spike/Mamx Spike Duplicate for the analytes Benzene MtBE was affected by the analyte concentrations already present in the un-spiked sample c=The Method Reporting Limit for Acetone has been increased due to the presence of an interfering compound d=Matrix Spike/Matnx Spike Duplicate Results for the analyte MtBE were affected by the analyte concentrations already present in the un-spiked sample e=Hydrocarbons reported as TPHg do not exhibit a typical Gasoline chromatographic pattern V a Matnx Spike/Matnx Spike Duplicate Results for the analyte Benzene were affected by the analyte concentrations already present in the urrsprked sample 117 Elevenl7 11 StomsX14117NTableskl4117 Current GroundwateridsHlstorical Water Page 7 of 7