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r To 1 GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road,Stockton,California ethyl Depth to TOC GW Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date (ug/Q: (ug1L) (ug1L) (ug1L) (uglL) (uglL) (ug1L) (ug1L) (uglL) (ug1L) (uglL) (ug1L) (uglL) (ug1L) (feet) (feet sea level) (feet sea level) Comments VIM-2 03126/99 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 dry interval 08/31/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 15 -25 12109199 ns ns ns ns ns ns ns as 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 05/18100 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 12/21/00 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 06126101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09105101 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 11130101 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 nm dry 12104102 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 02117103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06/03/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09/18/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 11/24/03 ns ns ns ns n$ ns ns ns ns ns ns ns ns ns dry nm dry 02/23/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06/07/04 ns ns ns n$ ns ns ns ns ns ns ns ns n$ ns dry nm dry 09/07/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry AS 1 02/21/00 80000 7600 16000 1800 9100 34 <2 0 <2 0 <2 0 <20 380 12000 18D 250 4589 nm nm slight odor/no sheen screened 05/18/00 23000 2300 4800 480 2900 <10 <10 <10 <10 <100 <1000 <100 no no 41 09 nm no odorino sheen interval 09/26/00 54000 2600 5300 590 3200 <5 0 no no no na no no no no 49 13 nm slight odor!no sheen 64 69 12121100 52000 5000 10000 1200 6000 <500 no na na no na no no no 4779 nm odor/no sheen 03/27/01 140000 16000 34000 3300 18000 <500 no no na na no no no no 4665 nm odor/no sheen 06126101 140000 14000 34000 3700 18000 <1 0 <1 0 <1 0 <1 o <10 <100 <100 83 140 4979 nm odor/no sheen 09/05/01 210000 17000 39000 4600 25000 <500 no na no no no no no no 5441 nm odorino sheen 11/30/01 150000 12000 32000 4000 19000 <2000 no no no na no no na no 5470 nm odor/no sheen 02127/02 200000 11000 38000 3600 19000 <2000 no na no na no no no no 5096 nm slight odorino sheen 05/16/02 120000 11000 23000 2200 11000 <100 <100 <100 <100 <1000 <10000 <1000 <100 <100 51 11 2242 2869 slight odor/no sheen 09/13/02 160000 12000 44000 $100 22000 <200 na na no no no no no no 5928 3686 odor)no sheen 12/04/02 110000 8300 25000 2200 12000 <500 no no no no no no na na 57 50 3508 odor lno sheen 02/17/03 170000 18000 33000 3100 15000 <200 no no no no na na na no 5497 3255 odor lno sheen 06/03/03 190000 20000 38000 4200 19000 <20 <20 <20 <20 <200 <2000 <2D0 82 93 5371 31 29 odor lno sheen 09118/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 11/24103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 58 B5 -3643 not sampled 02123104 200000 13000 29000 3500 18000 <50 <50 <50 <50 <500 <5000 <500 <50 <50 55 36 3294 odor lno sheen 06/07104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5563 -3321 not sampled 99!47194 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 6211 3969 not sampled 419gmrO4 As Prosed No 1419 47 Page 12 of 13 HORIZON ENVIRONMENTAL INC