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r <br /> TABLE 1A <br /> Groundwater Monitoring Data <br /> Beacon Station No.419 <br /> Stockton,California <br /> Well MTBE DIPE ETRE TAME TBA Methanol Ethanol EDC EDB comments <br /> Number Date (uall-) Nall, u L u L u L u L u IL u L u 1L <br /> VW-1 03126!99 49 <10 <10 <10 250 1700 220000 na na no odor/no sheen <br /> (screened 06/02/99 55 <10 <10 <10 240 4400 99000 35 790 slight odor/no sheen <br /> interval= 08131/99 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 /> 02/21/00 ns ns ns ns ns ns ns ns ns nm <br /> 05/18/00 ns ns ns ns ns ns ns ns ns dry <br /> VW-2 03126199 ns ns ns ns ns ns ns I ns ns Well dry at 24 0 feet <br /> (screened 06/02/99 ns ns ns ns ns ns ns ns ns slight odor 1 no sheen <br /> Interval= 08/31/99 ns ns ns ns ns ns ns ns ns Well Dry <br /> IF-2F) 12/09/99 ns ns ns ns ns ns ns ns ns Well Dry <br /> 02/21/00 ns ns ns ns ns ns ns ns ns Well Dry <br /> 05/18100 ns ns ns ns ns ns ns ns ns dry <br /> AS-1 02/21/00 34 20 <2 0 <2 0 <20 380 12000 180 250 slight odor/no sheen <br /> (screened 05/18/00 00 <10 <1 o <10 <100 <1000 <100 na na no odor 1 no sheen <br /> interval= <br /> 64'-69' <br /> Notes MTBE=methyl-tent-butyl ether TSA=tert-butanol ug/L=micrograms per liter or parts per billion(ppb <br /> DIPS=dusopropyl ether EDC=ethylene dichlonde na=not analyzed <br /> ETBE=ethyl-tert-butyl ether EDB=ethylene dibromide ns=not sampled <br /> TAME=tert-amyl methyl ether <br /> I <br /> 419gmr0002 xis Page 4 of 4 HORIZON ENVIRONMENTAL INC <br /> 41941 <br />