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Y 1 TABLE 1 Groundwater Monitoring Data Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California ethyl- Depth to TOC GW Well TPHg benzen toluene benzen xylenes MTBE DIPE ETBE TAME TBA methano ethanol EDC EDB GW Elevation Elevation Number Date (ug1L) (uglL) (uglL) (ug1L) (ug1L) (uglL) (ug/L) (ug1L) (ug/L) (ug1L) (uglL) (uglL) (ug/L) (uglL) (feet) (feet sea leve!)(feet sea level) Comments MW-10 12/02/98 2087 wellhead survey screened 12/30/98 180 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4584 -2497 no odor 1 no sheen 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 41'-66' 06102/99 160 <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 1 no sheen 08131199 120 <0 50 <0 50 <0 50 <0 50 <0 5o <0 50 <0 50 <0 50 93 <50 <5 0 65 <0 50 4574 -2487 no comment 12/09199 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 02121!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 1 no sheen 05/18100 <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 09126100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm well access blocked 12120!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 03127!01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4762 -2675 no odorno sheen MW-11 10/20100 240 -050 <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 screened 12/21100 300 <050 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4759 -2702 no odor!no sheen Interval 03/27101 190 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4631 -2574 no odor 1 no sheen 30'.50 VW-1 03126/99 260000 3000 1800 9100 44000 49 <10 <10 <10 250 1700 220000 na na 41 58 nm nm no odor/no sheen screened 06102!99 84000 2000 56000 5400 26000 55 <10 <10 <10 240 4400 99000 35 790 4092 nm slight odor/no sheen interval 08!31199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 34'-44' 12/09199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 02121100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 05118/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09128/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12/21/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03!27101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 478gmA0 fds 141941 Page 5 of 6 HORIZON ENVIRONMENTAL INC