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TABLE 1 ' GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California �I ethyl- Depth to TOC GW I Well TPHg benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevabon Number Date (ug1L) (ug1L) (ug1L) (ug/L) (ug1L) (ug/L)' (uglL) (u 11. (t1g/L) (ug/L) (ug/-) (uglL) (ug/L) (u ft.) (feet) (feel sea level) (feet sea level) Comments VW-2 03/26199 ns ns ns ns ns ns ' ns� ns ns ns ns ns ns ns dry nm nm dry screened 06/02199 ns ns ns AS ns ns {I ns ns ns ns ns ns ns ns dry nm dry Interval 08/31/99 ns ns ns ns ns ns I ns 1 ns ns ns ns ns ns ns dry nm dry 15-25 12/09/99 ns ns ns ns ns ns 11 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 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 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 06126101 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 As 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 II 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 12104102 ns ns ns ns ns ns i' ns as ns ns ns ns ns ns dry nm dry 02/17103 ns ns ns rts ns ns ns! ns ns ns ns ns ns ns dry nm dry 06/03103 ns ns ns ns ns ns l ns ns n$ 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 11/24103 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 02123!04 ns ns ns ns ns ns i; ns ns ns ns ns ns ns ns dry nm dry 06/07104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 09/07104 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry 1010104 ns ns ns ns ns ns �I ns ns ns ns ns ns ns ns dry nm dry 03108105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns dry nm dry I AS-1 02!21100 80000 7600 16000 1600 9100 34 1, <2 0 <2 0i <2 0 <20 380 12000 180 250 4589 nm nm slight odor/no sheen screened 05118/00 23000 2300 4800 480 2900 <10 <10 <10 <10 X100 <1000 <100 na na 4109 nm noodorinosheen Interval 09126100 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 4500{' 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 odorino sheen 06126101 140000 14000 34000 3700 18000 <1 0 jl <1 4 <1 0 <1 0 <10 <100 4100 83 140 4979 nmodor/no sheen 09/05101 210000 17000 39000 4600 25000 <500I' nal na na na na na na na 5441 nm odor/no sheen 1150/01 150000 12000 32000 4000 19000 <2000 na na na na na na na na 5470 nm odor/no sheen 02127102 200000 11000 38000 3600 19000 <2000 na na na na na na na na 5096 nm slight ododno sheen 05116102 120000 11000 23000 2200 11000 <1001, <1p0 <1Q0 <100 <1000 <10000 <1000 <100 <100 51 11 2242 -2869 slight odor/no sheen 09113/02 160000 12000 44000 5100 22000 <200 nal na na na na na na na 5928 3686 odor Ino sheen 12104102 110000 8300 25000 2200 12000 45001' na{ na na na na na na na 5750 3508 odor lno sheen 02117/03 170000 18000 33000 3100 15000 4200' nal na na na na na na na 5497 3255 oft I no sheen 06103/03 190000 20000 38000 4200 19000 <20 420 <20I <20 <200 <2000 <200 82 93 5371 3129 odor 1 no sheen 09118/03 nsns ns ns Ills ns ns I ns ns ns ns ns ns ns nm nm not sampled 11/24/03 ns ns ns ns ns ns ns 1 ns ns ns ns ns ns ns 5885 3643 not sampled 02123!04 200000 13000 29000 3500 18000 <50 450 450 <50 <500 <5000 <500 450 450 5536 3294 odor 1 no screen 06/07104 ns ns ns ns ns ns p ns ns ns ns ns ns ns ns 5563 3321 not sampled 09107/04 ns ns ns ns ns ns ns, ns ns ns ns ns ns ns 6211 3969 not sampled 12/10104 ns ns ns ns ns ns ns l ns ns ns ns ns ns ns 5979 3737 not sampled 03109105 130000 16000 26600 3500 16000 <50 <50 <60l <50 4500 <5000 <500 <50 <50 5621 3379 odor 1 no sheen I I li 4194 105r1s Proled No 1 1 I Page* HORIZON ENVIRON INC