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Table 1a <br /> Groundwater Monitoring Data <br /> Beacon Station No 419 <br /> Stockton, California <br /> i <br /> i <br /> Well Date MTBE DIPE ETRE TAME TBA Methanol Ethanol EDC EDB comments <br /> Number ug/L ug/L ug/L ug1L ug/L ug/L ug/L ug/L ug/L <br /> MW-9 17/30/98 <25 0 na na na na na na na na slight odor/no sheen <br /> (screened 03/26/99 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 na na no odor/no sheen <br /> interval= 06/02/99 <0 50 <0 50 <0 50 <0 50 13 <50 <5 0 16 <0 50 no odor/no sheen <br /> 41'-66') 08/31/99 055 <0 50 <0 50 <0 50 93 <50 <5 0 42 <0 50 no comment <br /> 12/09/99 079 <0 50 <0 50 <0 50 10 <50 <5 0 13 <0 50 no comment <br /> MW-10 12/30/98 <5 0 na na na na na na na na no odor/no sheen <br /> (screened 03/26/99 <0 50 <0 50 <0 50 <0 50 92 <50 <5 0 na na no odor/no sheen <br /> interval= 06/02/99 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 94 <0 50 no odor/no sheen <br /> 41'-66') 08/31/99 <0 50 <0 50 <0 50 <0 50 93 <50 <5 0 65 <0 50 no comment <br /> 12/09/99 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 26 <050 no comment <br /> VW-1 03/26/99 49 <10 <10 <10 250 1,700 220,000 na na no odor/no sheen <br /> (screened 06/02/99 55 <10 <10 <10 240 4,400 99,000 35 790 slight odor/no sheen <br /> mterval= 08/31/99 ns ns ns ns ns ns ns ns ns Well dry at 43 9 feet <br /> 34'.44') 12/09/99 ns ns ns ns ns ns ns ns ns Well Dry <br /> VW-2 03/26/99 ns ns ns ns ns ns ns ns ns Well dry at 24 0 feet <br /> (screened 06/02/99 ns ns ns ns ns ns ns ns ns slight odor/no sheen <br /> mterval= 08/3I/99 ns ns ns ns ns ns ns ns ns Well Dry <br /> 15'-25) 12/09/99 ns ns ns ns ns ns ns ns ns Well Dry <br /> I <br /> Notes <br /> MTBE=methyl tertiary-butyl ether TBA=Tert-Butanol ug/L=micrograms per Litre or parts per billion(ppb) <br /> DIPS=di-isopropyl ether EDC=ethylene dichlonde na=not analyzed <br /> ETBE=ethyl tertiary butyl ether EDB=ethylene dibromrde ns=not sampled <br /> TAME=tertiary amyl methyl ether <br /> 99QMtable 04 Page 3 of 2 HORIZON ENVIRONMENTAL INC <br />