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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 RIPE ETBE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation NumberDate (uglL) (ug1L) (ug1L) (uglL) (ug1L) (uglL) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (uglL) (uglL) (feet) (feet sea level) (feet sea level) Comments VW-2 03126!99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm nm dry i screened 06/02/99 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 16'-25' 12/09/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 02/21100 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 09/26/00 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 12121/00 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 09/05/01 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 02/26/02 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 12104/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 02117/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06103/03 ns ns ns AS ns ns ns ns ns ns ns ns ns ns dry nm dry 09/18103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 11/24/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry AS-1 02121/00 80000 7600 16000 1600 9100 34 <2 0 <2 0 <2 0 <20 380 12000 180 250 4589 nm nm slight odor/no sheen screened 05/18100 23000 2300 4800 480 2900 <10 <10 <10 <10 <100 <1000 <100 na na 4109 nm no odorino sheen 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 64 69' 12/21/00 52000 5000 10000 1200 6000 <500 na na na na na na na na 4779 nm odor/no sheen 03/27/01 140000 16000 34000 3300 18000 <500 na na na na na na na na 4665 nm odor/no sheen 06/26/01 140000 14000 34000 3700 18000 <1 0 <1 0 <1 0 <1 0 <10 <100 <100 83 140 4979 nm odor/no sheen 09/05/01 210000 17000 39000 4600 25000 <500 na na na na na na na na 5441 nm odor/no sheen 11/30/01 150000 12000 32000 4000 19000 <2000 na na na na na na na na 5470 nm odor/no sheen 02!27102 200000 11000 38000 3600 19000 <2000 na na na na na na na na 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 5100 22000 <200 na na na na na na na na 5928 3686 odor f no sheen 12/04/02 110000 8300 25000 2200 12000 <500 na na na na na na na na 5750 3508 odor 1 no sheen 02117/03 170000 18000 33000 3100 15000 <200 na na na na na na na na 5497 3255 odor 1 no sheen 06/03/03 190000 20000 38000 4200 19000 <20 <20 <20 <20 <200 <2000 <200 82 93 5371 31 29 odor 1 no sheen 09!18!03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns nm nm not sampled 11124/03 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5885 -3643 not sampled » 3gmr�3,.is Page 12 of 13 HORIZOR ENVIRONMENTAL INC I