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f Historical Groundwater T"Iring <br /> and Analytical Data <br /> 7-Eleven Store#20632 <br /> 4627 Da Vinci Drive <br /> Stockton,CA <br /> L <br /> 01 Ethyl= MtBE Dissolveon Date : Benzene Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPE ELBE 'TAME Notes Oxygen DTW SPT WTE <br /> lwgfL) (P91L) (pg1L)," (NgfL) (Ng1L) (wg1L) (Vg1L) (pg1L) (PgfL) (Ng1L) l (Wg1L) (mg/L) (feet) (feet):' (feet) <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tert-amyl-methyl ether pg1L=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 grab=grab groundwater sample collected from soil boring <br /> ELBE=Ethyl-lert-butyl 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 E&I. <br /> Samples analyzed by EPA Method 8260B starting 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<50 pg/L. <br /> f=well damaged/not sampled <br /> 1:17-Elevenl7-11 Stores1206321Tables120632 Current Groundwater.xlsHistorical Water Page 10 of 10 <br />