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HISTORICAL GROUNDWATER MONITORING DATA (CONTINUED) (9/27/99 THROUGH 6/25/03) DATE DTW 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 µg/L µg/L µglL µg/L }tg/L mg/L ltg/L Method" 8260Bf 8260$$ 8260Bt 8260E f 8260E f 80I5M$• 8260B Monitoring Well& Elevation MW-7 12/29/00 NM NM 0.3 ND 0.9 0.7 1,000 ND TBA-42;TAME-5.8 (34.06) 1/16/01 16.42 17.64 NS NS NS NS NS NS NS 315101 15.98 18.08 ND ND 0.6 0.5 2.2 ND ND 6/4/01 17.94 16.12 ND ND ND ND 8,300 ND TBA--90;TAME-36 9/10/01 19.72 14.34 ND ND ND ND 20,000 ND ND 12/17/01 19.32 14.74 ND ND ND ND 26,500 0.13 ND (36.42*) 9/26102 21.61 14.81 <0.5 <0.5 <0.5 <1.0 12,000 <0.05 - -TAME-42 12/27/02 19.98 16.44 1 <2.0 <2.0 <2.0 <4.0 3,500 <0.05 TAME-18 3/21103 1833 18.09 <2.0 <2.0 <2.0 <4.0 6,400 <0.05 TAME-33 6/25103 20.59 15.83 <2.0 <2-0 <2.0 <4.0 6,800 <0.05 TAME-28 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 6/4101 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 -------------- 12/17/07- 19.30 - 14.76 -ND- -0.4 - ND - - ND NDND-Np- ---- - -ND---- --- (36A3*) -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 3/21103 18.34 18.09 <0.5 <0.5 <0.5 <1.0 <0.5 <0.05 <0,5-5.0 6/25103 20.73 15.70 <0.5 <0.5 <0.5 <1.0 <0.5 <0.05 <0.5-5.0 MW-9 6/15101 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 (35.950) 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 Q.0 2.1 <0.05 <0-5-5.0 3121/03 17.91 18.04 <0.5 <0.5 <0.5 Q.0 2.5 <0.05 <0.5-5.0 6125103 21.26 14.67 <0.5 <0.5 <0.5 <1.0 <0.5 <O.05 <0.5-5.0 9127/99 through 12117!01 Groundwater Data Collected by Others AnalyCicaL (ELEV)=Groundwater elevation relative to NAD83 datum B,T,E,X=benzene,toluene,ethyl benzene,and total xylenes. We]]collar elevation resurveyed on September 30,2002 TPI3-G=total petroleum hydrocarbons,quantified as gasoline. (ELEVo)=Groundwater elevation relative to NAVD 83 datum Oxygenates/additives include: Methyl-t-Butyl Ether (MTBE), Ethanol (EtOH), t-Butanot (TBA),Di-Isopropyl Ether(RIPE),Ethyl-t-Butyl Ether(ETBE),t-Amyl Methyl Ether DTW=Depth to water in feet below top of casing (TAME).1.2-Dilimmoethnne(F.nR) and i -nirhln.nrtl-!t 7-nrAN NA=not analyzed. - •=Well Purged Dry,excessive sedimentation ND=not detected. NM=not measured. NS=not sampled. Unit C nv rsi0ns: µg/L;parts per billion(ppb) t=BTEX constituents collected prior to 9/26102 were analyzed by EPA Method 80216. mg/L:parts per million(ppm) t=Samples collected prior to 9126102 were analyzed for TPH-G by EPA Method 5030/1-ult •=Samples collected post 17/27/02 were analyzed for TPH-G by EPA Method 80150.