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Table 2 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#14117 <br /> 2725 Country Club Boulevard <br /> Stockton,CA <br /> We111D/ Ethyl- MtBE 1;2• Meth• "g, <br /> Ace- Dissolved <br /> Elevation Date Be Toll_ uene Bee.Ine XylenePTPg 8020 MtBE TBA DIPE EtBE T- DCA EDB anol tone Notes Oxygen DTW SPT WTEJ]J'1Lf7 L' /L 1L IL /L /L /LT' IL IL IL !L m /L feet feet feet <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gaschne TAME=Tert-amylmethyl ether TOC=Top of casing elevation in feet above mean sea level <br /> MtBE=Methyl-tert-butyl ether 1,2-DCA=1,2-dichiamethane pg/L=micrograms per Ifter <br /> TBA=Tert-Butanol EDB=1,2-dibromoethane mg/L=milligrams per liter <br /> DIPE=Dilsopropyl ether DTW=Depth to water —=Not sampled/not measured - <br /> EtBE=Ethyl-tert-butyl ether SPT=Separate-phase hydrocarbon.thickness *=Samples collected from MW-2 and MW-3 assumed to have been switched <br /> WTE=Water table elevation in the field.Second quarter 2007 sampling event on May 3,2007,provides <br /> confirmation of this assumption. <br /> Notes <br /> Historical data prior to 03/17/03 sample date provided by Shaw E&I.BTEX,TPHg and.MIBE analyzed using EPA Method 8020/8015 Modified. <br /> Samples analyzed by EPA Method 82608 starting'with 03/17/03 sample date. <br /> a=Method Blank Contamination. Theassociated method blank contains the target.analyte at a reportable level <br /> b=Matrix Spike/Matrix Spike Duplicate for the analytes Benzene,MTBE was affected by the analyte concentrationsalready present in the ur spiked sample. <br /> 'c=The Method Reporting Limit for Acetonehas been increased due to the presence of an interfering.compound. . <br /> d=Matrix Spike/Matrix Spike Duplicate Results for the analyte MtBE were affected by the analyte concentrations already presentin the un-spiked sample. <br /> e.=Hydrocarbons reported as TPHg do not exhibit a typical Gasoline chromatographic pattern. <br /> f=Matrix Spike/Matrix Spike Duplicate Results for the analyte Benzene were affected by the analyte concentrations already present in the un-spiked sample. <br /> g=This sample was analyzed by EPA Method 82608 using bottles that contained headspace bubbles greater than 1/4 inch in diameter. <br /> h=Depth to water monitored again per request of San.Joaquin County Environmental Health Department, <br /> i.=Samples collected from MW-2 and MW-3 assumed to have been switched in the field and subsequent laboratory report. May 2007 sampling event provides confirmation of this assumption. March 2007 analytical results for MW-2 and MW-3 <br /> have been posted/adjusted.accordingly. <br /> =Primary compounds not found in typical gasoline(TPHg) <br /> I:\7-Eleven\7.11 Stores\14117\Tables\14117 Current Groundwater.xlsxHistoncal Water Page 11 of 11 <br />