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. 02 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#19976 <br /> 1399 North Main Street <br /> Manteca CA <br /> E <br /> IDI Ethyl- MtBE 1,2- Eth- Meth- Dissolveion Date Benzene Toluene Benzene Xylene TPH-G 8020 MtBE TSA DIPE EtBE TAME DCA EDB anol anol Notes Oxygen DTW SPT WTE <br /> CI (pgfL) (pgfL) (p fL) WIL) (pg'-) (p fL) (pgfL) (pgfL) (pgfL) (pg►L) (pgfL) (pgfL) (pg/L) m IL) (m !L) (mglL) (feet) (feet} feet) <br /> Explanabon <br /> TPHg=Total petroleum hydrocarbons as-gasoline 1 2 DCA=12 Dichloroethane pg/L=micrograms per liter <br /> MtBE=Methyl ter(-butyl ether EDU=1 2 Dibromoethane mg/L=milligrams per liter <br /> TBA=Tert-butanol DTW=Depth to water —=Not sampledinot measured <br /> DIPE=Dnsopropyl ether SPT=Separate phase hydrocarbon thickness <br /> ELBE=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 03/07/03 sample date provided by Shaw E&I BTEX TPHg and MtBE analyzed using EPA Method 802018015 Modred <br /> Samples analyzed using EPA Method 8260B starting with 03/11103 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 MW4A sampled quarterly <br /> a=Deep zone well <br /> b=Laboratory results for the 11104/99 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 Shayrls 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 3111103 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 exhrbd Gasoline chromatographic pattern for sample MW 5A <br /> h=Matrix Spike/Matnx Spike Duplicate Results for MtBE were affected by the ana€yte concentration already present in the un spiked sample <br /> P=cross contamination of wells Wells were re-sampled and monitored on May 12 2006 <br /> 1 17 Eleven\7-11 Stores119976\Table09976 Current GroundwalerHistoncal Water Page 12 of 12 <br />