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TABLE 1 <br /> Groundwater Monitoring Data <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road, Stockton, California <br /> ethyl- Depth to TOC GW <br /> Well TPHg [benzene toluene benzene xylenes MTBE RIPE ETBE TAME TBA methanolethanol EDC EDB GW Elevation Elevation <br /> Number Date (ugll-) (ugll-) (ug1L) (ugll-) (ugll-) (ugll-) (ugll-) (ug1L) (uglL) (ug/L) (ugll-) (ug1L) (uglL) (uglL) (feet) (feet sea level)(feet sea level) Comments <br /> VW-2 03/26/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm nm dry <br /> screened 06102199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm slight odor 1 no sheen <br /> interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 15'-25' 12/09199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 02/21/00 ns ns ns n$ ns ns ns ns ns ns I ns ns ns ns dry nm dry <br /> 05/18/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 09/26/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 12121/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> I <br /> AS-1 02!21100 80000 7600 16000 1600 9100 34 <2 0 <20 <2 0 <20 380 12000 180 250 4589 nm nm slight odor/no sheen <br /> screened 05118/00 23000 2300 4800 480 2900 <10 <10 <10 <10 <100 <1000 <100 na na 41 09 nm no odorino sheen <br /> Interval 09/26/00 54000 2600 5300 590 3200 <5 0 na na na na na na na na 4913 nm slight odor 1 no sheen <br /> 64-69' 12/21/00 52000 5000 10000 1200 6000 <500 na na na na na na na na 4779 nm odor/no sheen <br /> AS-2 10120/00 29000 140 1600 650 3100 <0 50 <0 50 <0 50 <0 50 <5 0 <50 610 1 1 63 41 52 2076 -2076 <br /> screened 12/21/00 18000 120 1200 530 2800 <50 na na na na na na na na 4598 -2522 slight odor/no sheen <br /> Interval <br /> 123'-128' <br /> AS-3 10/20100 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 81000 <0 50 <0 50 4607 2060 -2547 <br /> screened 12/21100 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4805 -2745 no odor 1 no sheen <br /> Interval <br /> 80-85' <br /> Notes TPHg=total petroleum hydrocarbons as gasoline TBA=tert butanol GW=groundwater nm=not measured <br /> MTBE=methyl-tert-bury]ether EDC=ethylene dichloride TOC=top of casing na=not analyzed <br /> DIPS=dusopropyl ether EDS=ethylene dibromide <=less than Indicated reporting limit ns=not sampled <br /> ETBE=ethyl-tert butyl ether pgAL= micrograms per liter=parts per billion(ppb) <br /> TAME=tert-amyl-methyl ether <br /> 419gmr00 xis <br /> 141941 Page 6 of 6 HORIZON ENVIRONMENTAL INC <br />