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A <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 1,2- Eth- Meth- Dissolved <br /> Elevation Date Benzene Toluene Benzene Xylene TPM-G 8fl2© MtBE TBA DIPE EtBE TAME DCA anol anol Notes Oxygen DTW SPT WTE <br /> .2gL) (pgfL) (pg1L) (trglL) (pglL! WIL) (p9�L) Ip9fL! (Pg0") (pg/L) (pg1L) (pg1L) (m ! (mgR-} (mglL) (feet} (feet! {feet) <br /> OC (p <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-a"asoline 1,2-DCA=i 2-Dichloroethane pg/L=micrograms per liter <br /> MtBE=Methyl tert-butyl ether DTW=Depth to water mg1L=milligrams per liter <br /> TBA=Tert-butanol SPT=Separate-phase hydrocarbon thickness —=Not sampledlnot measured <br /> DIPE=Dusopropo ether WTE=Water table elevation <br /> EtBE=Ethyl-cert-butyl ether TOC=Tap of casing elevation in feet above mean sea level <br /> TAME=Tent amyl-methyl ether <br /> Notes <br /> Histoncal 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 82608 starbng with 03/11/03 sample date <br /> a=Deep zone well <br /> b=Laboratory results for the 11104/99 samples collected from the nested wells MW-1 and MWA A 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/Mainx 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 /> 117-Elevenl7-11 Stores1199761Tables119976 04-20 AsHistoncal Water Page 10 of 10 <br />