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Historical Groundwater Monitoring Data <br /> (9127/99 through 3/4/04) <br /> DATE DTWSLEV B T E X MTBE TPH-G OXYGENATES/ADDITIVES <br /> Detection Limits-+ 0.5 0.5 0.5 1.0 0.5 0.05 0.5-5.0 <br /> Ng/- Ng/L P91L ug/L pg/L mg/L IIP <br /> Analytical Methads-a 826013t 8260Bt 8260Bt 8260Bt 826013$ 8015M$- 8260B <br /> Monitoring Well& <br /> Elevation <br /> MW-11 (36.15+4) 10/30/2003 Monitoring Well MW-11 Installed <br /> 11/26/2003 23.98 12.17 NA NA NA NA 1,000 NA NA <br /> 12/31/2003 21.81 14.34 <0.5 <0.5 <0,5 <L0 520 <0.05 TAME-l.1 <br /> 3/4/2004 20.02 16.13 <0.5 <0.5 <0.5 <1.0 130 <0.05 <0.5-<5.0 <br /> EW-i {36.23*+) 10/30/2003 Extraction Well EW-1 Installed <br /> 11/26/2003 24.11 12.12 NA NA NA NA 230 NA NA <br /> 12/31/2003 21.91 14.32 <0.5 <0.5 <0.5 <1.0 36 <0.05 <0,5-<5.0 <br /> 3/4/2004 20.12 16.11 <0.5 <0.5 <0.5 <1.0 53 <0.05 <0.5-<5.0 <br /> 9!27199 through 9127101 Groundwater Data Collected by Others. Analytical: <br /> DTW=Depth to water in feet below top of casing. B,T,E,X=benzene,toluene,ethyl benzene,and total xylenes. <br /> ELEV Groundwater elevation in feet above mean sea level. TPH-G=total petroleum hydrocarbons,quantified as gasoline. <br /> •=Well collar elevation resurveyed on September 30,2002,relative MTBE=methyl tertiary-butyl ether. <br /> to NAVD 88 datum. Oxygenates/additives include:ethanol(EtOH),tertiary-butanol(TBA), <br /> ♦♦-Well collar elevation surveyed on November 5,'2003,relative di-isopropyl ether(DIPS),ethyl tertiary-butyl ether(ETBE),tertiary-amyl methyl <br /> to NAVD 88 datum. ether(TAME),1,2-dibromoethane(EDB),and 1,2-dichloroethane(1,2-DCA). <br /> Well purged dry. NA=not analyzed. <br /> ND-not detected, <br /> NM=not measured. <br /> NS=not sampled. <br /> Unit Conversions: pg/L:micrograms per liter=parts per billion(ppb) t=BTEX constituents collected prior to 9126/02 were analyzed by EPA Method 8021 B, <br /> mglL:milligrams per liter=parts per million(ppm) $=Samples collected prior to 9/26102 were analyzed for TPH-G by EPA Method 5030/Luft <br /> =Samples collected post 12/27/02 were analyzed for TPH-G by EPA Method 8015B. <br /> P:13000_prj13761 Boyett Manteca13761A Boyett Work Plans SRS ReportlReports10MR11004\3751 Hist.G.W.Data 1004 <br />