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Historical Groundwater Monitoring Data (9/27/99 through 9/28/04) DATE DTW ELEV B T E I X 1ITBE TPI!-G OXYGENATES/ADDITIVES Detection Limits 0,5 0.5 0.5 1.0 0.5 0.05 0.5-5.0 lrg/L Ng/L Pg/L Ng/ P91L mg/L NFIL Analytical Methods-i- 826013t 826013t 8260Bt 826013t 8260Bt 8015M$- 82608 Monitoring Well& Elevation MW-9(Continued) 3/4/2004 19.73 16.22 <0,5 <0.5 <0.5 <1.0 2.4 <0.05 <0.5-<5.0 6/2412004 23.46 12.49 <0.5 <0.5 <0.5 <1.0 <0.5 <0.05 <0.5-<5.0 9/28/2004 25.18 10.77 <05 <0.5 <0.5 <1.0 2.0 <0.05 <0.5-<5.0 MW-10 (36.09N) 1013012003 Monitoring Well MW-10 Installed 11/26/2003 24.21 11.88 NA NA NA NA 150 NA NA 12/31/2003 22.14 13.95 <0.5 <0.5 <0,5 <L0 230 <0,05 TAME-0,6 3/4/2004 20.92 15.17 <0.5 <0.5 <0.5 <1.0 660 <0.05 TAME-1.3 6/24/2004 21.55 14.54 <0.5 <05 <0.5 <1.0 8.3 <0.05 <0.5-<5.0 912812004- 24.55 11.54 NS NS NS NS NS NS NS MW-11 (36.15*t') 105012003 Monitoring Well MW-II Installed 11/2612003 23.98 12.17 NA NA NA NA 1,000 NA NA 12/31/2003 21.81 14.34 <0.5 <0.5 <0.5 <1.0 520 <0.05 TAME-1,1 3/4!2004 20.02 16.13 <0.5 <0.5 <0.5 <1,0 130 <0.05 <0.5-<5.0 6/24/2004 23.67 12.4a <0.5 <0,5 <0.5 <1.0 66 <0.05 <0.5-<5.0 9/28!2004 25.44 10.71 <0.5 <0.5 <0.5 <1.0 140 <0.05 <0.5-<5.0 EW-1 (36.231*) 10/3012003 Extraction Well EW-I Installed 11/26/2003 24,11 12.12 NA NA NA NA 230 NA NA 12/31/2003 21.91 14.32 <0.5 <0.5 <0.5 <1 0 36 <0.05 <0.5-<5.0 3/4/2004 20.12 16.11 <0.5 <0.5 <0,5 <L0 53 <0.05 <0.5-<5.0 6/24/2004 23.79 12,44 <0.5 <0.5 <0.5 <L0 <0.5 <0.05 <0.5-<5.0 9/28/2004 25.55 10.68 <0.5 <n.5 <0.5 <1.0 90 <0.05 <0.5-<5.0 9127/99 through 9/27/01 Groundwater Data Collected by Others. Analytical; DTW=Depth to water in feet below top of casing. B,T,E,X-benzene,toluene,ethyl benzene,and total xylenes. ELEV=Groundwater elevation in feet above mean sea level. TPH-G=total petroleum hydrocarbons,quantified as gasoline. ♦a Well collar elevation resurveyed on September 30,2002,relative MTBE=methyl tertiary-butyl ether. to NAVD 88 datum. Oxygenates/additives include:ethanol(EtOH),tertiary-butanol(TBA), Well collar elevation surveyed on November 5,2003,relative di-isopropyl ether(DIPS),ethyl tertiary-butyl ether(ETBE),tertiary-amyl methyl to NAVD 88 datum. ether(TAME),1,2-dibromoethane(EDB),and 1,2-dichloroethane(1,2-DCA). =Well purged dry. NA=not analyzed. ND=not detected. NM=not measured. NS=not sampled. Unit Co_�ons: pg/L:micrograms per liter=parts per billion(ppb) t=BTEX constituents collected prior to 9126102 were analyzed by EPA Method 8D21 B. mg1L:milligrams per liter=parts per million(ppm) $s Samples collected prior to 9/26102 were analyzed for TPH-G by EPA Method 5030/Luft •=Samples collected post 12/27/02 were analyzed for TPH-G by EPA Method 9015B, • P:13000_pr)13761 Boyett Manteca13761 G Boyett Manteca Groundwater Monitoring\Reports\3Q04NHistoricaI Data