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Historical Groundwater Monitoring Data <br /> (9127199 through 12129104) <br /> DATE DTW ELEV B T E X MTBE TPH-G OXYGENATESIADI)ITEVES <br /> Detection Limits-r 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--t• 826013t 8260Bt 82603t 8260Bt 8260Bt 8015M+• 8260B <br /> Monitoring Well& <br /> Elevation <br /> EW-I (3613**) 10/30/2003 Extraction Well EW-1 Installed <br /> 11/26/2003 24.11 1212 NA NA NA NA 230 NA NA <br /> 12/31!2003 21.91 14.32 <0.5 <0.5 <0.5 <1 A 36 <0.05 <05-<5.0 <br /> 3/4/2004 20.12 16.1 I <0.5 <0.5 <0.5 <1.0 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.O <br /> 9/28/2004 25.55 10.68 <0.5 <0.5 <0.5 <1.0 90 <0.05 <O.5-<5.0 <br /> 12/29/2004 21.15 15.08 <O.5 1 <0.5 1 <0.5 1 <I.0 59 <0.05 <0.5-<5.0 <br /> 9127199 through 9/27101 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. TPR-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(DIP E),ethyl tertiary-butyl ether(ETRE),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 9126102 were analyzed by EPA Method 8021 B. <br /> mg/L:milligrams per liter=parts per million(ppm) j=Samples collected prior to 9/26102 were analyzed ror TPH-G by EPA Method 5030/Luft <br /> •-Sample=-collected pest 12/27/02 were analyzed fur TPH-G by EPA Method 80158. <br /> P:13DDO_prj13761 Boyett Manteca13761 C Boyed Manteca Groundwater MonitoringlReports14Q041Historical Data-As <br />