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1 Historical Groundwater Monitoring Data <br /> S (9127/99 through 11126103) <br /> DATE DTW ELEV B T E X MTBE TPH-G OXYGENATESIADDITIVES <br /> Detection Limit5-1 0.5 0.5 0.5 1 0.5 0.05 0.5-5.0 <br /> pg/L pg/L Ng/L Ng/L Ng/L mglL Irg/L <br />! Analytical Methods-4 9260Bt 8260Bt 8260Bt 8260Bt 826013t 8015Mt- 8260B <br /> Monitoring Well& <br /> Elevation <br /> MW-10 (36.09••) 10/30/03 Monitoring/Extraction Well MW-10 Installed <br /> 11/26/03 24.21 1 11,88 L NA I NA I NA I NA 150 NA NA <br /> MW-11 (36.15••) 10/30/03 Monitoring/Extraction Well MW-11 Installed <br /> 11/26/03 23.98 1 12.17 1 NA I NA I NA NA 1 1,000 N—A--F NA <br /> 1 EW-1 (36.23••) 10f30/03 IMunitoringlExtraction Well EW-I Installed <br /> 11126/03 1 24.11 1 12.12 NA NA FNA <br /> NA 1 230 NA NA <br /> 9127/99 through 9127/01 Groundwater Data Collected by Others Analytical: <br /> 1 (ELEV)-Groundwater elevation relative to NAD83 datum B,T,E,X-benzene,toluene,ethyl benzene,and total xylenes. <br /> Well collar elevation resurveyed on September 30,2002 TPH-G-total petroleum hydrocarbons,quantified as gasoline. <br /> (ELEV•)=Groundwater elevation relative to NAV D 83 datum Oxygenates/additives include: Methyl-t-Butyl Ether(MTBE),Ethanol(EtOH),t-Butanol(TBA), <br /> Well collar elevation surveyed on November 5,2003 (TBA),Di-Isopropyl Ether(DIPS),Ethyl-t-Butyl Ether(ETBE),t-Amyl Methyl Ether <br /> (ELEV••)=Graundwater elevation relative to NAVD 83 datum (TAME),1,2-Dibmnmethane(EDB),and t,2-Dichloroethane(1,2-DCA). <br /> 1 NA=not analyzed. <br /> DTW-Depth to water in feet below top of casing ND=not detected. <br /> NM=not measured. <br /> =Well Purged Dry,excessive sedimentation NS-not sampled. <br />' t-Samples collected prior to 9/26102 analyzed for BTEX by EPA Method 8021 B. <br /> Unit Conversions, $=Samples collected prior to 9126102 analyzed for TPH-G by EPA Method 5030/1,uft <br /> pg/L:micrograms per liter=parts per billion(ppb) •=Samples collected post 12/27/02 analyzed for TPH-G by EPA Method 80156. <br /> mg/L:milligrams per liter=parts per million(ppm) _ <br /> 1* <br /> i <br /> 1 <br /> i <br /> i <br /> P:t3000_pd"761 SoyettMuntma13761B Boyer Manteca-GroundwaterlnvestigationlRcponsVReponslHist G,W.Dauxls - <br /> I <br />