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Historical Groundwater Monitoring Data <br /> (9/27/99 through 3/22/05) <br /> DATE DTW ELEV B T E X MTBE TPH-C OXYGENATESMDDITIVES <br /> Detection Limits-0 0.5 0.5 0.5 1.0 0.5 0.05 0.5-5.0 <br /> pg/L pg/L pg/L Pg/L pg/L mg/L pg/L <br /> Analytical Methods 8260Bt 9260Bt 8260Bt 8260Bt 8260Bt 8015M;- 82608 <br /> Monitoring Well& <br /> Elevation <br /> EW-1 (36.2304) 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 d.0 53 <0.05 <0.5-<5.0 <br /> 6/24/2004 23.79 12.44 <0,5 <0.5 <0.5 <1.0 <0.5 <0.05 <0.5-<5.0 <br /> 9/28/2004 25.55 10.68 <0.5 <0.5 <0.5 <1,0 90 <0.05 <0.5-<5.0 <br /> 120-912004 21.15 1 15.08 1 <0.5 1 <0.5 1 <0.5 <1.0 1 58 <0.05 1 <0.5-<5,0 <br /> 3/22/2005 18.07 1 18.16 10.5 <0.5 1 <0.5 <1.0 1 150 <0.05 <0.5-<5.0 <br /> 9127199 through 9/27!01 Groundwater Data Collected by Others. Analvticai: <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(DIPE),ethyl tertiary-butyl ether(ETRE),tertiary-amyl methyl <br /> to NAVD 88 datum, ether(TAME),1,2-dibromoethane(EDB),and 1.2-dichleroethane(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: p8/L:micrograms per liter=parts per billion(ppb) t=BTEX constituents collected prior to 9/26/02 were analyzed by EPA Method 8021 B. <br /> m6/L:milligrams per liter=parts per million(ppm) Y=Samples collected prior to 9126102 were analyzed for TPH-G by EPA Method 50301f.uft <br /> •=Samples collected post 12/27/02 were analyzed for TPH-G by EPA Method 8015B, <br /> i <br /> P:13000_prj13761 Boyett Manteca13761C Boyett Manteca Groundwater MonitoringlReports11Q05\Historical Data.xis <br />