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• TAIS t 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 Rate (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (Lig/L) (ug/L) (ug/L) (ug/L {uglL) (feet) (feet sea level) (feet sea level) Comments VW-2 03/26/99 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm nm dry 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 15'-25' 12/09/99 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 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 06/26/01 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 AS ns ns dry nm dry 02126/02 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 nm dry 12/04/02 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 02/17/03 ns ns AS ns ns ns ns ns ns ns ns ns ns ns dry nm dry 06/03103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09/18103 ns ns AS 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 02123104 ns ns ns ns ns ns ns ns ns AS ns ns ns ns dry nm dry 06107/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry A5-1 02121100 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!16!00 23000 2300 4800 460 2900 <10 <10 <10 <10 <100 <1000 <100 na na 4109 nm no odor/no 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 12121/00 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 c500 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 odorino sheen 09/05/01 210000 17000 39000 4600 25000 <500 na na na na na na na na 5441 nm odorino sheen 11/30/01 150000 12000 32000 4000 19000 <2000 na na na na na na na na 5470 nm odor/no sheen 02/27/02 200000 11000 38000 3600 19000 <2000 na na na na na na na na 5096 nm slight odor/no sheen 05/16/02 120000 11000 23000 2200 11000 <100 <100 <100 <100 <1000 <10000 <1000 <100 000 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 6928 -3686 odor lno sheen 12/04/02 110000 8300 25000 2200 12000 <500 na na na na na na na na 5750 3508 odor lno sheen 02/17103 170000 18000 33000 3100 15000 <200 na na na na na na na na 5497 32 55 odor lno sheen 06/03/03 190000 20000 38000 4200 19000 <20 <20 <20 <20 <200 <2000 <200 82 93 5371 3129 odor lno sheen 09/18/03 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 5885 -3643 not sampled 02123104 200000 13000 29000 3500 18000 <50 <50 <50 <50 <500 <5000 <500 <50 <50 5536 3294 odor lno sheen 06107/04 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5563 3321 not sampled 419gmr04 As PmodNo 141947 Page 12 of 13 HORIZON ENMOlEUZNTAL INC