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TaQ2 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#20632 <br /> 4627 Da Vinci Drive <br /> Stockton,CA <br /> Well-IDI Ethyl-' C-, - MtBE �_,, Dissolved <br /> Elevation Date Benzene l Toluene Benzene )Xylene TPHg 8020 MtBE TBA DIPE EtBE TAME; Notes Oxygen DTW, SPT WTE <br /> TOC (pgIL) (pglL) (N9IL) {N9ft-? t1�9fE1 INgI�1. (pgIL) (pg1Ll (pgIL1 - 1Lig1L) (pgll-) € (miglL) _ .(feet) (feet) (feet) <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tert-amyl-methyl ether pglL=micrograms per liter <br /> MtBE=Methyl-tert-butyl ether DTW=Depth to water mg1L=milligrams per liter <br /> TBA=Tert-butanol SPT=Separate-phase hydrocarbon thickness =Not sampled/not measured <br /> DIPE=Diisopropyl ether WTE=Water table elevation <br /> EtBE=Ethyl-tert-butyi ether TOC=Top of casing elevation in feet above mean sea level <br /> Notes <br /> Historical data prior to 03/26/03 sample date provided by Shaw E81. <br /> Samples analyzed by EPA Method 82608 starling with 03/26/03 sample date. <br /> a=Method Blank Contamination. Method blank contains target analyte at a reportable level. <br /> b=Estimated Benzene result. Result concentration exceeds the calibration range. <br /> c=Elevated reporting limit for MtBE,TBA,DIPE,ELBE. The reporting limit is elevated due to matrix interference. <br /> d=Matrix SpikelMatrix Spike Duplicate Results for MtBE were affected by the analyte concentration already present in the un-spiked sample. <br /> e=Analysis for TPHg was affected by short-term instrument contamination problem.Normally,the sample would be re-analyzed,but the problem was not identified until after the hold time <br /> time had expired. It is likely that the actual concentration of TPHg is X50 pg/L. <br /> a <br /> 1:17-Elevenl7-11 Stores1206321Tables120632 Current Groundwater.xlsHistorical Water Page 8 of 8 <br />