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0 <br /> 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 DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation <br /> Number Date (ug/L) (ug/L) (ug/L) (ug1L) (uglL) (ug/L) (uglL) (uglL) (ug/L) (ug/L) (u91L) (uglL) (ug/L) (ug/L) <br /> (feet) (feet sea level)(feet sea level) Comments <br /> MW-10 12102/98 2087 wellhead survey <br /> screened 12/30/98 180 <050 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4584 -2497 no odor/no sheen <br /> interval 03/26/99 140 064 <0 50 <0 50 072 <0 50 <0 50 <0 50 <0 50 92 <50 <5 0 na na 4165 -2078 no odor I no sheen <br /> 41'-66' 06/02/99 160 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 94 <0 50 4096 -2009 no odor I no sheen <br /> 08/31/99 120 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 93 <50 <5 0 65 <0 50 4574 -2487 no comment <br /> 12/09/99 56 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 26 <0 50 4746 -2659 no comment <br /> 02/21/00 55 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 33 <0 50 4591 -2504 no odor I no sheen <br /> 05/18/00 <50 <0 50 31 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 41 11 -2024 no odor/no sheen <br /> 09/26/00 n5 ns n$ ns ns ns ns ns ns ns ns ns ns ns nm nm well access blocked <br /> 12/20/00 <50 <0 50 70 <0 50 <0 50 <5 0 na na na na na na na na 4789 -2702 no odor 1 no sheen <br /> MW-11 10/20/00 240 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 14 <50 130 23 <0 50 4925 2057 -2868 wellhead survey <br /> screened 12/21/00 300 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4759 -2702 no odor 1 no sheen <br /> interval <br /> 301-50, <br /> VW-1 03/26/99 260000 3000 1800 9100 44000 49 <10 <10 <10 250 1700 220000 na na 41 58 nm nm no odor/no sheen <br /> screened 06/02/99 84000 2000 56000 5400 26000 55 <10 <10 <10 240 4400 99000 35 790 4092 nm slight odor/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 /> 34 -44' 12/09/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 02/21/00 ns ns ns ns ns ns ns ns ns ns 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 /> 09126/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 12/21/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry <br /> 419gmr00rus <br /> 141941 Page 5 of 6 HORIZON ENVIRONMENTAL INC <br /> I <br />