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*E I GROUNDWATER MONITORING DATA Former Beacon Station No 12419 2350 Waterloo Road, Stockton, California ethyl- I Depth to TOC GW Well TPWg benzene toluene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevation Elevation Number Date I(u L) (ug1L) (u 1L) (ug1L) (uglL) (ug/L) (u 1L) (u L) (ug1L) (ug1L) ug/L) (uglL) (u 1L) u IL) (feet) (feet sea level) feet sea level Comments AS-1 02/21/00 80000 7600 16000 1600 9100 34 <2 0 <20 <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 <100 <1000 <100 na na 4109 nm no ododno sheen interval 09126/00 54000 2600 5300 590 3200 <5 0 na na na na na na na na 4913 nm slight odor 1 no sheen 64-69 12/21100 52000 5000 10000 1200 6000 <500 na na na na na na na na 4779 nm odorino sheen 03127101 140000 16000 34000 3300 18000 <500 na na na na na na na na 4665 nm odorino sheen 46126!01 140000 14000 34000 3700 18000 <1 0 <1 0 <1 0 <1 0 <10 <100 <100 83 140 4979 nm odor/no sheen 09/05101 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 02/27/02 200000 11000 38000 3600 19000 <2000 na na na na na na na na 5095 nm slight odorino sheen 05/16102 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 <2110 na na na na na no na na 1921 -3686 odor 1 no sheen 12!04102 110000 8300 25000 2200 12000 <500 na na na na na na na na 5750 -3508 odor lno sheen 02/17/03 170000 18000 33000 3100 15000 <200 na na na na na na na na 5497 -3255 odor 1 no sheen 06103/03 190000 20000 38000 4200 19000 <20 <20 <20 <20 <200 <2000 <200 82 93 5371 -3129 odor lno sheen 09118/03 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 02/23/04 200000 13000 29000 3500 18000 <50 <50 <50 <50 <500 <5000 <500 <50 <50 5536 -3294 odor lno sheen 06/07/04 ns ns ns ns ns ns n$ ns ns ns ns ns ns ns 5563 -3321 not sampled 09/07104 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 ns ns ns ns ns ns ns 5979 -3737 not sampled 03/09105 130000 16000 26000 3500 16000 <50 <50 <50 <50 <500 <5000 <500 <50 <50 5621 3379 odor lno sheen 05124!05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 5128 -2886 not sampled 08/31105 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 56 30 -3388 not sampled 12/12/05 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 4335 -2093 not sampled I No 1419 46 ray rge Pro�act Page 14 of 16 HORIZON ENVIRONMENTAL INC