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li <br /> ' Table la- Groundwater Monitoring Data <br /> Beacon Station No.474 <br /> h 3443 East Main Street,Stockton,California <br /> II <br /> V <br /> i <br /> Well Date MTBE DIPE ETBE TAME TBA Meth. Eth. EDC EDB <br /> Number ugtL ugIL ug& u ugIL u u u g& u Comments <br /> MW-9 03/31/98 <5.0 na na na na na reported as MW-lA <br /> screen 06/10/98 <5.0 na na na na na reported as MW-lA <br /> interval 09/08/98 <0.50 <0.50 <0.50 <0.50 <5.0 <5.0 no odor/no sheen <br /> 56'-76' 12/30/98 <0.50 na na na na na no odor/no sheen <br /> 03/25/99 <0.50 <0.50 <0.50 <0.50 <5.0 <5.0 no comment <br /> 06/03/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 5.3 <0.50 no comment <br /> 08/30/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 0.66 <0.50 no comment <br /> VW-1 09/08/98 0.7 <0.50 <0.50 <0.50 <5.0 6.8 strong odor/no sheen <br /> screen 12/30/98 <1000 na na na na na Petrol.odor/no sheen <br /> interval 03/25/99 <5.0 <5.0 <5.0 <5.0 <50 <50 no comment <br /> 50'-65' 06/03/99 <5.0 <5.0 <5.0 <5.0 <50 <50 <50 140 520 no comment <br /> 08/30/99 <50 <50 <50 <50 <500 <5000 <500 160 620 no comment <br /> VW-4 09/08/98 1.4 <0.50 <0.50 <0.50 <5.0 <5.0 strong odor/no sheen <br /> screen 12/30/98 <100 na na na na na Petrol. odor/no sheen <br /> interval 03/25/99 <5.0 <5.0 <5.0 <5.0 <50 <50 no comment <br /> 50'-65' 06/03/99 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 930 120 no comment <br /> 08/30/99 86 <20 <20 X20 <200 <2000 <200 850 64 no comment <br /> Notes: <br /> MTBE=inethyl tertiary-butyl ether na=not analyzed <br /> DIPE=di-isopropyl ether tis=not sampled <br /> ETBI---=ethyl tertiary butyl ether mn=not measured <br /> I'AME= fertiarV amyl methyl ether NM=Not Measured <br /> 'FBA=tertiary butyl alcohol nc=not calculated <br /> Meth. = methanol <br /> Fth, =ethanol <br /> p <br /> II i <br /> 99QMTable.Q3 Page 3 of 3 HORIZON ENVIRONMENTAL INC. <br /> i <br /> . I <br /> ii <br />