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Table 2 • <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#19976 <br /> 1399 North Main Street <br /> Manteca CA <br /> L <br /> IDI Ethyl- u,� -: "MtBE1,2= Eth- Meth- Dissolvtion Date Benzene4 Toluene Benzene Xylene 'TPT1-G 8020 MtBETBW- I IPE EtBE TAME. IDCA -anol anol Notes Oxygen OTW SPT INTE <br /> C (it9 ) (Ngll) li n (N '. f! ug1L) (ljWL) (ttg►L) 0.191L (ice) v (tom [N! ) Em ) OWL) w _-`(mgiL) (feet) (feet)- (feed <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline 1 2-DCA=1,2-Dichloroethane pg/L=micrograms per liter <br /> MTBE=Methyl-tert-butyl ether DTW=Depth to water mg/L=milligrams per liter <br /> TBA=Tart-butanol SPT=Separate-phase hydrocarbon thickness —=Not sampled/not measured <br /> DtPE=Dusopropyl ether WTE=Water table elevation <br /> EtBE=Ethyl-tert butyl ether TOC=Top of casing elevation in feet above mean sea level <br /> TAME=Tert-amyl-methyl ether <br /> Notes <br /> Historical data pnor to 03/07/03 sample date provided by Shaw E&I BTEX,TPHg and MtBE analyzed using EPA Method 8020/8015 Modified <br /> Samples analyzed using EPA Method 8260B starting with 03/11/03 sample date <br /> a=Deep zone well <br /> b=Laboratory results for the 11/04/99 samples collected from the nested wells MW-1 and MW-1A were switched The table shows corrected data <br /> c=Method Blank Contamination The method blank contains the targeted analyte at a reportable level <br /> d=Data Missing from Shaws Historical Table <br /> e=Matrix SpiketMatnx Spike Duplicate Results for Benzene Toluene and MtBE were affected by the analyte concentration already present in the un-spiked sample <br /> f=Samples from MW-5 and MW-5A Inadvertently sampled from the wrong well casing on 3/11103 and 6127103 The sample reported as"MW-5"was collected from MW-5A and the sample reported as"MW-5A"was <br /> collected from MW-5 <br /> g=Hydrocarbons from TPHg do not exhibit Gasoline chromatographic pattern for sample MW-5A <br /> 1 <br /> 117-Elevenl7-11 Stores4199761Tables`19976 041 O xlsHlstoncal Water Page 10 of 10 <br />