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i 02 • <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7 Eleven Store 019976 <br /> 1399 North Main Street <br /> Manteca CA <br /> WelllDI EBenzene <br /> hyl- MtBE 7,2- Eth- Meth- Dissolved <br /> Elevation Date Benzene Toluene Xylene TPH-G 8020 MtBE TBA DIPE EtBE TAME DCA EDB anol anol Notes Oxygen DTW SPT WTE <br /> TOC (pglL) ( 1L) ) g!L IL (pg/L) { (pg/LI (p (mg/L) ((mg/L m 1L fe <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline 1 2-DCA=1 2-Dichloroethane pg1L=micrograms per Inter <br /> NBE=Methyl-cert butyl ether EDB=1 2 Dibromoethane mg1L=milligrams per liter <br /> TBA=Tert butanol DTW=Depth to water —=Not sampledlnot measured <br /> DIPE=Diisopropyl ether SPT=Separate-phase hydrocarbon thickness <br /> ELBE=Ethyl-ted-butyl ether WTE=Water table elevation <br /> TAME=Tert amyl-methyl ether TOC=Top of casing elevation in feet above mean sea level <br /> Motes <br /> Historical data prior 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 8260E 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 MW-4 sampled quarterly <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 Shaws Historical Table <br /> e=Matrix SpikelMatnx 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 /> Ig=Hydrocarbons from TPHg do not exhibit Gasoline chromatographic pattern for sample MW-5A <br /> 117-ElevenV-11 Stores1199761Tables119976 Current Groundwater AsHistoncal Water Page 11 of 11 <br />