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Tallp <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#17334 <br /> 4501 North Pershing Avenue <br /> Stockton CA <br /> Well ID Ethyi- MtBE Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPHg TPHd 8020 MtBE TBA DIPE ELBE TAME Notes Oxygen DTW SPT WTE <br /> TOC (PglL) {Psn-f {p9►L) {pg1L) fPg/L) {peri.) (P91L) (N 1L) WIL) {PgIL) (ii9IL) (V91L) (mg1L) {feet) {feet) if <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 /> 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=Dasopropyl ether WTE=Water table elevation <br /> Notes <br /> Historical data pnor to 03127/03 sample date provided by Shaw E&I <br /> Samples analyzed by EPA Method 82608 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 /> 117-Eievenl7 11 Stores11733417ab1es117334 Current Groundwater xlsHistoncal Water <br /> Page 7 of 7 <br />