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HISTORICAL GROUNDWATER MONITORING DATA (CONTINUED) (9127199 THROUGH 12127/02) DATE DT W ELEV B T E X MTBE TPH-G OXYGENATES/ADDITIVES ' Detection Limits 0.5 0.5 0.5 1.0 0.5 0.05 0.5-5.0 Analytical ug/1 ltg/l µg/1 µg/l n/l mg/l µg11 Methods-► 8260Bt 826013t 8260Bt 8260Bt 8260131 8015M$ 8260B ' Monitoring Well& Elevation MW-8 1/16/01 16.45 17.61 ND ND ND ND ND ND ND (34.06) 3/5/01 16.01 18.05 ND ND 1.1 0.8 ND ND ND 6/4/01 17.92 16.14 ND ND ND ND ND ND ND 9/10/01 20.76 13.30 0.5 0.6 1.8 3.4 4.9 ND ND 12/17/01 19.30 14.76 ND 0.4 ND ND ND ND ND (36.43,.) 9/26/02 21.79 14.64 <0.5 <0.5 <0.5 <1.0 <0.5 <0.05 <0.5 5.0 ' 12/27/02 19.85 16.58 <0.5 <0.5 <0.5 <1.0 93 <0.05 <0.5-5.0 MW-9 6/15/01 17.65 15.94 ND ND ND ND 15 ND ND ' (33.59) 9/10/01 19.56 14.03 5.4 5.7 17 30 ND 0.24 ND 12/17/01 18.66 14.93 0.7 2.4 1.4 5.8 ND 0.06 ND ^ (35.95+) 9/26/02 21.91 14.04 <0.5 <0.5 <0.5 <1.0 0.8 <0.05 <0.5 5.0 12/27/02 18.83 17,12 <0.5 <0.5 <0.5 <1.0 2.1 <0.05 <Q 5 5.0 9/27/99 through 12/17/01 Groundwater Data Collected by Others (ELEV)=Groundwater elevation relative to NAVD 88 datum Well collar elevation resurveyed on September 30,2002 (ELEV+)-Groundwater elevation relative to NAVD 88 datum DTW=Depth to water in feet below top of casing .=Well Purged Dry,excessive sedimentation Unit Conversions: Anal"cal: Agll:parts per billion(ppb) B,T,E,X=benzene,toluene,Ethyl benzene,and total xylenes. mo:parts per million(ppm) TPH-G=total petroleum hydrocarbons,quantified as gasoline. Oxygenates/additives include: Methyl-t-Butyl Ether(MTBE),Ethanol(EtOH,t-Butanol(TBA), Di-Isopropyl Ether (DiPE), Ethyl-t-Butyl Ether (ETRE), t-Amyl Methyl Ether (TAME), 1,2- Dibromoethane(EDB),and 1,2-Dichloroethane(1,2-ACA). NA=not analyzed. ND=not detected. NM=not measured. NS=not sampled. C-BTEX constituents collected prior to 9126/02 were analyzed by EPA Method 80218, $=Samples collected prior to 9/26/02 were analyzed for TPH-G by Method 5030/Luft