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TOE 1 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California ethyl- Depth to TOG GW WeilTPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanal EDC EDB GW Elevation Elevation Number Date (uglL) (uglL) (ug1L) (uglL) (ug1L) (uglL) (ug1L) (ug1L) (uglL) (ug1L) (ug1L) (uglL) (uglL) (ug1L) (feet) (feet sea level) (feet sea level) Comments MW 11 10/20/00 240 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 14 <60 130 23 <0 50 4925 2057 2868 wellhead survey screened 12/21/00 300 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4759 2702 no odor I no sheen Interval 03127101 190 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4631 -2574 no odor!no sheen 30 50 06126/01 160 <0 50 <0 50 <0 50 1 5 -050 <0 50 <0 50 <0 50 12 <50 17 16 <0 50 4882 -2825 no odor!no sheen 09105/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nc well dry 11130/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 02126/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 05116/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry 2210 nm dry 09!13102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry VW-1 03126/99 260000 3000 1800 9100 44000 49 <10 <10 <10 250 1700 220000 na na 4158 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 08131/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 34' 44' 12/09/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 02/21/00 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 09/26/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12/21100 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 03/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06126/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09/05/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 11/30/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 02/26102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 05/16/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry 2242 nm dry VW 2 03/26/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm nm dry screened 06102/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm slight odor 1 no sheen Interval 08131199 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 15 25' 12109/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 02121/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 05/18/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09!26100 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 03/27/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06/26/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09/05101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 11/30/01 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 02126102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 05/16102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 419gmr02 His Project No 141945 Page 6 of 7 HORIZON ENVIRONMENTAL INC