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2 <br /> Historical GroundwaterSonng and Analytical Data . <br /> 7-Eleven Store#17334 <br /> 4501 North Pershing Avenue <br /> Stockton CA <br /> Well IDI 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 (pg L) (pgfL) {pglL} (lig/L) (i�g�l {pglL} {pglL} WIL) {pg L) (pgfL} {pglL} (pg[L] (feet) {feet} (feet) <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline EtBE=Ethyl-cert-butyl ether TOC=Top of casing elevation in feet above mean sea level <br /> TPHd=Total petroleum hydrocarbons-as-diesel TAME=Tertamyl-methyl ether pglL=micrograms per liter <br /> MtBE=Methyl-tent-butyl ether DTW=Depth to water mg/L=milligrams per Inter <br /> TBA=Tert-butanol SPT=Separate-phase hydrocarbon thickness —=Not sampled/not measured <br /> DIPE=Dusopropyl ether WTE=Water table elevation <br /> Notes <br /> Historical data prior to 03/27103 sample date provided by Shaw E&I <br /> Samples analyzed by EPA Method 6260B starting with 03127!03 sample date <br /> a=Method Blank Contamination for Ethytbenzene 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 Spike/Matrix Spike Duplicate Results for the analyte Benzene were affected by the analyte concentrations already present in the un spiked sample <br /> Id=Matrix Spike/Matrix Spike Duplicate Results for the analyte TBA were affected by the analyte concentrations already present in the un-spiked sample <br /> I <br /> 117-Elevenl7-11 Stores117334yTables117334 Current Groundwater AsHistorical Water Page 7 of 7 <br />