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i TO i <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#19976 <br /> 1399 North Main Street <br /> Manteca CA <br /> Well ID/ Ethyl- MtBE L <br /> issolveElevation Date Benzene Toluene Benzene Xylene TPH-G 8020 MtBE TBA DIPE EtBE TAME EDB anol anol Notes Oxygen DTW SPT WTI:TOG Ipg� 1LI ( ( L !L ( !L) ( ) {pg)L} ( lL (p ) (m L) m (m !L) feat' feet) feet <br /> Exolanatron <br /> TPHg=Total petroleum hydrocarbons as-gasoline 1 2-DCA=7 2-Dichloroethane pgtL=micrograms per liter <br /> MtBE=Methyl-tert butyl ether EDB=1 2 Dibromoethane mg1L=milligrams per liter <br /> TBA=Tart butanol DTW=Depth to water —=Not sampled/not measured <br /> DIPE=Ousopropyl ether SPT=Separate-phase hydrocarbon thickness <br /> EtBE=Ethyl-tert butyl ether WIFE=Water table elevation <br /> TAME=Tart amyl-methyl ether TOC=Top of casing elevation in feet above mean sea level <br /> Notes <br /> Historical data prior to 03107103 sample date provided by Shaw E&1 BTEX TPI-Ig and MtBE analyzed using EPA Method 8020/8015 Modified <br /> Samples analyzed using EPA Method 82608 starting with 03111/03 sample date <br /> Per SJCEHD letter dated July 28 2004 wells MW-4 and MW-4A are sampled annually <br /> Per SJCEHD letter dated May 3 2005,well MW-4 is to be sampled semi-annually and MW-4 sampled quarterly <br /> a=Deep zone well <br /> b=Laboratory results for the 11104199 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 Spike/Matnx 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 /> Ig=Hydrocarbons from TPHg do not exhibit Gasoline chromatographic pattern for sample MW-5A <br /> 17-Elevenl7-11 Stores11997MTables119976 Current Groundwater AsKstoncal Water Page 12 of 12 <br />