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Tat <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#20632 <br /> 4627 Da Vinci Drive <br /> Stockton,CA <br /> LWelalltliD/ Ethyl- MtBE Dissolvedon Date Benzene Toluene Benzene Xylene TPHg 8026 MtBE TBA DIPE EtBE TAME- Notes Oxygen DTW SPT 'WTE <br /> (pglL) (pglt) (pg1L) (pg1l) (pg1L) (pgfL) .: . .(pg1L) (pg1L) (pg1L) (pgfL) (pg/L) (mg1L) (feet) (feet) (Feet) <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline TAME=Tert-amyl-methyl ether lig1L=micrograms per liter <br /> MtBE=Methyl-tert-butyl ether DTW=Depth to water mglL=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 sail boring <br /> EtBE=Ethyl-tert-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 Spike/Matrix 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 /> If=well damaged/not sampled <br /> I:k7-Elevenl7-11 Stores120632kTablesk20632 Current Groundwater.xlsHistorical Water Page 8 of 8 <br />