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(�► �' Tab-;I 5 <br /> Historical Groundwater Monitoring and Analytical Data <br /> 7-Eleven Store#19976 <br /> 1399 North Main Street <br /> Manteca,CA <br /> ,Welt lD/ ..: re a Ethyl~ MtBE, X1,2 Eth <br /> Elevation tiDate Benzene Toluene Benzene Xylene TPH G X80201 MtBE- TBA ° RE EtBE <TAME :D_C_A' �anol aeol Notes D xygen1 �DTW S?7 VffE <br /> F OC 019/1-Y (u92) : .Grs1D )... (ugl[l (v5�)', (Pg` =040 ) (v9V-) (N91E) mgll_) mg&. .>- U,(mg&) (feet)eta (feet). 3(feet) <br /> Explanation <br /> TPHg=Total petroleum hydrocarbons-as-gasoline 1.2-DCA=1,2-Dichloroethane pg/L=micrograms per liter <br /> MtBE=Methyt-tert-butyl ether DTW`=Depth to water mg/L=milligrams per liter <br /> TBA=Teri-butanol SPT=Separate-phase hydrocarbon thickness =Not sampled/not measured <br /> DIPE=Diisopropyl ether WTE=Water table elevation <br /> EtBE=Ethyi-tert-butyl ether TOC=Top of casing elevation in feet above mean sea level <br /> TAME=Tert-amyl-methyl ether <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 8020/8015 Modified. <br /> Samples analyzed using EPA Method 62606 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 Btank 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/Matrix 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 /> 1:17-Elevenl7-11 Stores11997617ables119976 03-40.xlsHistorical Water Page 10 of 10 <br />