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Table 2 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#21756 <br /> 853 East Yosemite Avenue <br /> Manteca,CA <br /> Well IDI Ethyl- MtBE 1,2- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPH-G 8020 MtBE TBA DIPE EtBE TAME DCA EDB Motes Oxygen DTW SPT WTE <br /> OC (N fL (pglL WIL} pgfL) (Ng1L) { g!L) (pg1L) (Ng/L (}rglL) (pgfL ( gfL gIL g!L {mgfL) (feet) feet feet? <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline 1 2-DCA=1 2-Dichloroethane pg1L=micrograms per liter <br /> MtBE=Methyl-lert-butyl ether EDB=1,2-Dibromoethane mg1L=milligrams per liter <br /> TBA=Tert-butanol DTW=Depth to water Not sampled/not measured <br /> DIPS=Dssopropyl ether SPT=Separate-phase hydrocarbon thickness <br /> EtBE=Ethyl-tert-butyl ether WTE=Water table elevation <br /> TAME=Tert-amyl-methyl ether TOC=Top of casing elevation in feet above mean sea level <br /> Notes <br /> Historical data prior to 03/10/03 sample date provided by Shaw E&I BTEX TPHg and MtBE analyzed using EPA Method 802018015 Modrfied <br /> Samples analyzed using EPA Method 82608 starting with 03/10103 sample date <br /> a=Method Blank Contamination The associated method blank contains the target analyte at a reportable level <br /> b=Matnx SpikelMatnx Spike Duplicate Results associated with Sample MW-4 for Toluene and Benzene were outside of control limits due to an inconsistency between vials <br /> Since the LCS recoveries were within control limits,no data are flagged <br /> c=Less than 0 5 feet of water rn well Groundwater sample not collected <br /> 117-Elevenl7-11 Stores`217561Tables121756 03-4Q AsHistorical Water Page 3 of 3 <br />