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' TaC3 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#20632 <br /> 4627 Da Vinci Drive <br /> Stockton,CA <br /> Well ID! Ethyl- MtBE Dissolved <br /> Elevation Date Benzene .Toluene Benzene Xylene TPHg 8020 MtBE TBA DIPE °ELBE TAME Notes Oxygen DTW SPT : WTE <br /> TOC (VgIL) (NgIL) (NgIL) (NgIL) (wglL) (PgIL) (pg1L)-- (NgIL) (NglL) (trglL) i (Ng1L) H91Lj (feet). (feet) (feetj. <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 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 soil boring <br /> ELBE=Ethyl-tert-butyl ether TOC=Top of casing elevation in feet above mean sea level <br /> Nates <br /> Historical data prior to 03/26/03 sample date provided by Shaw E&l. <br /> Samples analyzed by EPA Method 82606 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,EtBE. 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 X50 pgIL. <br /> 1:17-Elevenl7-11 Stores1206321Tables120632 Current Groundwater.xlsHistorical Water Page 8 of 8 <br />