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I <br /> . 02 <br /> 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 MtBE TBA DIPE ELBE TAME DCA EDB anol anol Notes Oxygen DTW SPT WTE <br /> OC (w 1L) lu fL# _ ` (P n) (P9f-} ir��l { } { It+ Ip l }` t # ( (mWL)(POM WL) L) fea <br /> Explanatlon <br /> TPHg=Total petroleum hydrocarbons-as-gasoline 1 2-DCA=1 2-Dlchloroethane pg1L=micrograms per[der <br /> MtBE=Methyl-tert-butyl ether EDB=1 2-Dibromoethane mg1L=milligrams per Ider <br /> TBA=Tart-butanol DTW=Depth to water —=Not sampled/not measured <br /> DIPE=Diisopropyl ether SPT=Separate-phase hydrocarbon thickness <br /> EtBE=Ethyl-tert-butyl ether WTE=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 03/07/03 sample date provided by Shaw ERI BTEX TPHg and MtBE analyzed using EPA Method 8020!$015 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 2905 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 land MWAA 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=Matnx Spike/Matnx Spike Duplicate Results for Benzene Toluene and MTBE were affected by the anatyte 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 3111/03 and 6127/03 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 Elevenl7-11 Stores1199761Tabies119976 Current Groundwater xlsHistoncal Water Page 12 of 12 <br /> I <br />