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• Tai • <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#17334 <br /> 4501 North Pershing Avenue <br /> Stockton CA <br /> Well ID! Ethyl- MtBE Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg TPHd 8020 MtBE TBA DIPE EtBE TAME Notes Oxygen DTW SPT WTE <br /> TOC (wg1L) 01W WWI-) (U ) (pgrL) (pg1L) I WWI-) (Ng1L) (VgfL) (pg1L) (jig) IpgrL) I L) (feet) (feet) (feet) <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons as-gasoline ELBE=Ethyl tert butyl ether TOC=Top of casing elevation in feet above mean sea level <br /> TPHd=Total petroleum hydrocarbons as-.diesel TAME=Tert-amyl methyl ether pg/L=micrograms per liter <br /> MISE=Methyl-tert-butyl ether DTW=Depth to water mg1L=milligrams per liter <br /> TBA=Tert-butanol SPT=Separate-phase hydrocarbon thickness —=Not sampledlnol measured <br /> DIPE=Dusopropyl ether WTE=Water table elevation <br /> Notes <br /> Histoncal data prior to 03/27/03 sample date provided by Shaw E&I <br /> Samples analyzed by EPA Method 8260B starting with 03/27/03 sample date <br /> a=Method Blank Contamination for Ethylbenzene The associated method blank contains the target analyte at a reportable level <br /> b=Method Blank Contamination for Toluene The associated method blank contains the target analyte at a reportable level <br /> c=Matrix SpikelMatnx Spike Duplicate Results for the analyte Benzene were affected by the analyte concentrations already present In the un spiked sample <br /> d=Matrix SpikelMatnx Spike Duplicate Results for the analyte TBA were affected by the analyte concentrations already present in the un-spiked sample <br /> I <br /> 117-EleveM7 11 Stores1173341Tables117334 Current Groundwater xlsHrstonCal Water Page 7 of 7 <br />