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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 /> Well ID/ Ethyl- MtBE 1,2- Meth- Eth- Ace- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPE EtBE TAME DCA EDB anol anol tone Notes Oxygen DTW SPT WTE <br /> OC L /L !L fL !L IL /L IL !L IL /L !L IL /L IL (Mg/L feet feet feet <br /> MW-7 <br /> 1.19 11/05/01 <0.5 <0.5 <0.5 <0.5 <50 - <5 <20 <5 <5 <5 <5 <5 1.0 10.20 0.00 -9.01 <br /> 1.53 01/08/02 -- -- -- - -- -- -- -- -- -- -- -- -- - -- -- 0.9 - 0.00 -- <br /> 04/12/02 <0.5 <0.5 <0.5 <0.5 <50 <5 2.4 <5 <0.5 <0.5 <0.5 - 1.0 7.47 0.00 -5.94 <br /> 07/09/02 <0.5 <0.5 <0.5 <0.5 <50 <5 2.4 <5 <0.5 <0.5 <0.5 -- 1.1 7.90 0.00 -6.37 <br /> 10/16/02 <0.5 <0.5 <0.5 <0.5 <50 <5 0.52 15 <0.5 <0.5 <0.5 - - - - 1.0 9.43 0.00 -7.90 <br /> 03/17/03 <0.50 <0.50 <0.50 <0.50 110 8.6 <5.0 <0.50 <0.50 <0.50 -- 1.2 7.67 0.00 -6.14 <br /> 05/29/03 <0.50 <0.50 <0.50 <0.50 <50 -- 4.2 <5.0 <0.50 <0.50 <0.50 - -- - - 1.4 7.94 0.00 -6.41 <br /> 0.98 09/18/03 <0.50 <0.50 <0.50 <0.50 160 -- 3.6 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <5.0 <5.0 2.3 9.54 0.00 -8.56 <br /> 12/02/03 <0.50 <0.50 <0.50 <0.50 <50 -- 1.7 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <5.0 -- 0.1 9.09 0.00 -8.11 <br /> 03/03/04 <0.50 <0.50 <0.50 <0.50 <50 0.54 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 d 0.2 6.68 0.00 -5.70 <br /> MW-8 <br /> 1.90 09/18/03 25 130 64 340 3,200 -- 2.2 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <5.0 <8.0 c 0.8 10.61 0.00 -8.71 <br /> 12/02/03 2.2 4.3 4.7 13 320 0.79 <5.0 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <5.0 - 0.0 9.85 0.00 -7.95 <br /> 03/03/04 56 140 59 360 2,500 67 140 <0.50 <0.50 <0.50 <0.50 <0.50 -- d 0.3 7.47 0.00 -5.57 <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tert-amyl-methyl ether TOC=Top of casing elevation in feet above mean sea level <br /> MtBE=Methyl-tert-butyl ether 1,2-DCA=1,2-dichloroethane pg/L=micrograms per liter <br /> TBA=Tert-Butanol EDB=1,2-dibromoethane mg/L=milligrams per liter <br /> DIPE=Diisopropyl ether DTW=Depth to water -=Not sampled/not measured <br /> ELBE=Ethyl-tert-butyl ether SPT=Separate-phase hydrocarbon thickness <br /> WTE=Water table elevation <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 Modred. <br /> Samples analyzed using 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 /> I:\7-Eleven\7-11 Stores\14117\Tables\14117 04-1C.xlsHistorical Water Page 6 of 6 <br />