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Table 2 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#19976 <br /> 1399 North Main Street <br /> Manteca CA <br /> W <br /> ell Ethyl- MtBE 1,2- Eth- Meth- Dissolved <br /> Date Benzene Toluene Benzene Xylene TPH-G 8020 MtBE TBA DIPE EtBE TAME DCA anol anol Notes Oxygen DTW SPT WTE <br /> (pg1L) (pg1L) (pg/L.) (pglL) (Nell) Gigli (pgll) (UglL) ( 1L) (pglL) (pgfl) (pglL) (mglL) (mg1L) (mg1L) {feet) (feet) (feet) <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline 1,2 DCA=1 2-Dichloroethane Vg1L=micrograms per liter <br /> MtBE=Methyl-tert-butyl ether DTW=Depth to water mglL=milligrams per liter <br /> TBA=Tert butanol SPT=Separate-phase hydrocarbon thickness —=Not sampled/not measured <br /> DIPE=Dusopropyl ether WTE=Water table elevation <br /> ELBE=Ethyl tart butyl ether TOC=Top of casing elevation in feet above mean sea level <br /> TAME=Tert-amyl methyl ether <br /> Notes <br /> Historical data pnor to 03107!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 8260E starting with 03/11/03 sample date <br /> a=Deep zone well <br /> b=Laboratory results for the 11/04/99 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 Shaw's 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 Sand MW 5A inadvertently sampled from the wrong well casing on 3/11103 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 /> I <br /> 117-Etevenl7-11 1 Stores\199761Tablesll9976 03-4Q xlsHistoncal Water Page 10 of 10 <br /> I <br />