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s <br /> TABLE 3A <br /> QUARTERLY MONITORING DATA <br /> Beacon Station No. 474 <br /> Well Date MTBE DIPE ETBE TAME TBA Meth. Eth. EDC EDB <br /> Number ugfL u ug& ugtL UWL Ug/1, u ugdL u Comments <br /> VW-1 09/08/98 0.70 <0.50 <0.50 X0.50 <5.0 <5.0 6.8 strong odor/no sheen <br /> screen 12/30/98 <1000 na na na na na na Petrol.odor/no sheen <br /> interval 03/25/99 <5.0 <5.0 <5.0 <5.0 <50 <50 <50 no comment <br /> 50'-65' 06/03/99 <5.0 <5.0 <5.0 <5.0 <50 <50 <50 140 520 no common! <br /> 08/30/99 <50 <50 <50 40 <500 <5000 <500 160 620 no comment <br /> 12/10/99 <100 <100 <100 <100 <1000 <10000 4000 160 590 no comment <br /> 03/03/00 <100 <100 <100 400 <1000 <20000 4000 1,500 5,800 no odor/no sheen <br /> VW-2 03/03/00 na ns ns ns ns nsns ns ns Dry <br /> VW-3 03/03/00 ns no ns ns ns na ns tis ns Ra <br /> VW-4 09/08/98 1.4 <0.50 <0.50 <0.50 <5.0 <5.0 <5.0 strong odor/no sheen <br /> screen 12/30/98 400 na na na na na na Petrol.odor/no sheen <br /> Interval 03/25/99 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 no comment <br /> 50'-65' 06/03/99 <0.50 @.50 <0.50 <0.50 <5.0 <50 <5.0 930 120 no comment <br /> 08/30/99 86 <20 40 40 <200 4000 400 850 64 no comment <br /> 12/10/99 QO <20 X20 40 <200 <10000 <200 710 42 no comment <br /> 03/03/00 na m ns ns ns ns ns ns na Dry <br /> VW-7 1 03/03/00 ns ns ns ns ns ns ns ns ns Dry <br /> Dotes: <br /> MTBE=methyl tertiary-butyl other na=not analyzed <br /> DIPE=di-isopropyl ether ns=not sampled <br /> ETBE=othyl tertiary butyl ether nm=not measured <br /> TAME=tertiary amyl methyl ether NM=Not Measured <br /> TBA=tertiary butyl alcohol no=not calculated <br /> Meth.=methanol <br /> EtIL=ethanol <br /> gwgmdata.)ds <br /> 1474.22rpt Page 4 of 4 HORIZON ENVIRONMENTAL INC. <br />