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• HISTORICAL GROUNDWATER MONITORING DATA(CONTINUED) (9127199 THROUGH 2121103) DATE DTW ELEV B T E X MTBE TPH-G OXYGENATESIADDITIVES Detection Limits-+ 0.5 0.5 0.5 1.0 0.5 0.05 0.5-5.0 Analytical Ng/1- µg/L µg/L µff/L ug/L mg/L ug/L Methods-+ 9260Bt 826081 82608t 8260Bt 8260Bt 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 I4.76 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 3/21/03 18.34 1 18.09 <0.5 <0.5 1 <0.5 1 <1.0 1 <0.5 <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 (35.951.) 9/26102 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 <0.5-5.0 3/21/03 17.91 18.04 <0.5 10.5 <0.5 <1.0 2.5 <0.05 <0.5-5.0 9127/99 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: Analytical: µg/L:parts per billion(ppb) B,T,E,X=benzene,toluene,ethyl benzene,and total xylenes. mg/L:parts per million(ppm) TPH-G=total petroleum hydrocarbons,quantified as gasoline. Oxygenatesladditives include: Methyl-t-Butyl Ether(MTBE),Ethanol(EtOH),t-Butanol(TBA), Di-Isopropyl Ether (DIPE), Ethyl-t-Butyl Ether (ETBE), t-Amyl Methyl Ether (TAME), 1,2- Dibromoethane(EDB),and 1,2-Dichlomethane(1,2-DCA). NA=not analyzed. ND=not detected. NM=not measured. NS=not sampled. )'=BTEX constituents collected prior to 9126/02 were analyzed by EPA Method 8021B. =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 80158.