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Table 4 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#14117 <br /> 2725 Country Club Boulevard <br /> Stockton,California <br /> tt t D` <br /> 4 <br /> MW-8 08/29/08 1.2 0.92 0.75 1.3 170 - 290 170 <0.50 <0.50 <0.50 - d 0.4 11.01 0.00 <br /> (cont.) 12/01/08 22 9.0 22 180 1,200 250 140 <0.50 <0.50 <0.50 - 0.2 10.53 0.00 <br /> 03/02/09 3.7 2.6 1.5 9.3 280 - 220 120 <0.50 <0.50 <0.50 - - - - 0.3 8.13 0.00 <br /> 1.93 06/01/09 0.60 <0.50 <0.50 2.5 150 260 160 <0.50 <0.50 <0.50 1.8 9.54 0.00 -7.61 <br /> 09/11/09 0.59 0.75 <0.50 1.8 88 - 170 50 <0.50 <0.50 <0.50 - - - - 1.1 11.20 0.00 -9.27 <br /> 11/12/09 0.88 0.98 <0.50 3.7 110 150 63 <0.50 <0.50 <0.50 1.4 10.00 0.00 -8.07 <br /> 03/01/10 1.6 0.65 <0.50 2.0 74 - 110 120 <0.50 <0.50 <0.50 - - 1.2 8.01 0.00 -6.08 <br /> 06/09/10 0.85 <0.50 <0.50 3.8 <50 86 8.7 <0.50 <0.50 <0.50 0.7 8.88 0.00 -6.95 <br /> 09/07/10 0.51 <0.50 <0.50 0.73 <50 - 22 <5.0 <0.50 <0.50 <0.50 - 2.6 10.61 0.00 -8.68 <br /> 12/13/10 <0.50 <0.50 <0.50 <0.50 <50 2.9 <5.0 <0.50 <0.50 <0.50 3.91 9.45 0.00 -7.52 <br /> 02/14/11 0.52 <0.50 <0.50 <0.50 <50 - 0.88 <5.0 <0.50 <0.50 <0.50 - - - 3.8 8.63 0.00 -6.70 <br /> 05/09/11 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <5.0 <0.50 <0.50 <0.50 5.19 8.24 0.00 -6.31 <br /> 08/15/11 <0.50 <0.50 <0.50 <0.50 <50 - 3.7 <5.0 <0.50 <0.50 <0.50 - - 0.52 9.93 0.00 -8.00 <br /> 11/30/11 <0.50 0.82 <0.50 0.85 <50 - 1.6 <5.0 <0.50 <0.50 <0.50 1.8 9.98 0.00 -8.05 <br /> 02/13/12 <0.50 <0.50 <0.50 <0.50 <50 - 0.64 <5.0 <0.50 <0.50 <0.50 - - 3.9 9.24 0.00 -7.31 <br /> 05/02/12 <0.50 <0.50 <0.50 <0.50 <50 - <0.50 <5.0 <0.50 <0.50 <0.50 - - - 5.37 8.29 0.00 -6.36 <br /> 08/09/12 <0.50 <0.50 <0.50 <0.50 <50 - 1.7 <5.0 <0.50 <0.50 <0.50 - - - 4.43 10.15 0.00 -8.22 <br /> 11/01/12 <0.50 <0.50 <0.50 <0.50 <50 1.2 <5.0 <0.50 <0.50 <0.50 - 0.68 10.65 0.00 -8.72 <br /> 02/04/13 <0.50 0.55 <0.50 0.55 <50 0.76 <5.0 <0.50 <0.50 <0.50 - 4.27 8.50 0.00 -6.57 <br /> 05/03/13 <0.50 <0.50 <0.50 <0.50 <50 0.65 <5.0 <0.50 <0.50 <0.50 - 4.59 8.75 0.00 -6.82 <br /> 08/16/13 <0.50 <0.50 <0.50 <0.50 <50 1.2 <5.0 <0.50 <0.50 <0.50 - - 4.70 10.73 0.00 -8.80 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tertiary-amyl methyl ether TOC=Top of casing elevation in feet above mean sea level <br /> MtBE=Methyl tertiary butyl ether 1,2-DCA=1,2 dichloroethane pg/L=micrograms per liter <br /> TBA=Tert-butyl alcohol EDB=1,2 dibromoethane mg/L=milligrams per liter <br /> DIPE=Diisopropyl 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 /> i confirmation of this assumption. <br /> Notes <br /> Historical data prior 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 8260B starting with 03/17/03 sample date. <br /> a=Method Blank Contamination. The associated 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 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/Matrix 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 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 8260B 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 /> j=Primary compounds not found in typical gasoline(TPHg) <br /> V:\1857\acfive\7-Eleven\active\185750063-711_14117\05-report-deliv\tables\14117 Current Groundwater.xlsxHistorical Water Page 12 of 12 <br />