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*2 <br /> k Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#19976 <br /> 1399 North Main Street <br /> Manteca CA <br /> Well IDI Ethyl- MtBE 1,2- Eth- Meth- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPH-G 8020 1 MtBE TBA DIPE EtBE TAME DCA EDB anol anol Notes Oxygen DTW SPT WTE <br /> TOC (pgfL) {pg/L} p !L g/L ) ( g1L ) ( ) ( (p ) (M411.) m 1L fee feet fe <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline 1 2-DCA=12 Dichloroethane pg/L=micrograms per Iger <br /> MtBE=Methyl-tert butyl ether EDB=1 2-Dibromoethane mg/L=milligrams per Iger <br /> TBA=Tert butanol DTW=Depth to water —=Not sampledlnot measured <br /> DIPE=Diisopropyl ether SPT=Separate-phase hydrocarbon thickness <br /> ELBE=Ethyl-cert 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 03107/03 sample date provided by Shaw E81 BTEX TPHg and M1BE analyzed using EPA Method 802018015 Modified <br /> Samples analyzed using EPA Method 82606 starting with 03/11/03 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 quartedy <br /> a=Deep zone well <br /> b=Laboratory results for the 11/04/99 samples collected from the nested wells MW-t 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 casrrig on 3111/03 and 6/27103 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 /> 117 ElevenV-11 Stores1199764Tables419976 Current Groundwater xlsHisloncal Water Page 11 of 11 <br />