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TAI 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/L) (ug/L) (ug/L) (ug/L) (ug/L) (uglL) (ug/L) (ug1L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW-4 03/31/98 75 <0 50 <0 50 <0 50 <0 50 <50 na na no na na no no no 4792 2000 -2792 screened 06/10/98 58 <0 50 <0 50 <0 50 <0 50 <50 no no no no no no no no 4221 -2221 interval 09/08/98 50 1 3 14 <0 50 24 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 na no 4664 -2664 no odor I no sheen 48-70 11!12!98 no ns ns ns no ns ns ns ns ns ns ns ns ns 2000 wellhead survey 12/30/98 68 14 087 <0 50 1 1 <50 no no na na no no no no 4500 -2500 no odor 1 no sheen 03/26/99 74 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <20 no no 4075 -2075 no odor 1 no sheen 06/02/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 32 <0 50 4019 2019 no odor 1 no sheen 08/31/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 43 <0 50 4509 -2509 no comment 12/09/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 6 9 <50 <5 0 49 <0 50 4656 -2656 02/21/00 68 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 30 <0 50 4494 -2494 no odor I no sheen 05118/00 62 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 na no 3923 1923 no odor!no sheen 09!26100 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na no 4855 2855 no odor I no sheen 12!20100 <50 <0 50 <0 50 <0 50 <0 50 <50 na na na na no no no no 4698 2698 no odor 1 no sheen 03/27/01 <50 <0 50 <0 50 <0 50 <0 50 e50 no no no no no no no no 4571 -25 71 no odor I no sheen 06/26/01 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 <0 50 <0 50 4840 2840 no odor/no sheen 09/05/01 <50 <0 50 <0 50 <0 50 <0 50 <50 no no no na no no no no 5355 3355 no odor I no sheen 11/30/01 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no no no no na no 5339 3339 no odor/no sheen 02/27/02 <50 <0 50 <0 50 <0 50 <0 50 <5 0 no no no na no no no no 5009 3009 no odor I no sheen 05116!02 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 43 <0 50 5027 21 56 2871 no odor I no sheen 09112!02 <50 <0 50 <0 50 <0 50 <0 50 <50 no no no no no no no no 5846 3690 no odor I no sheen 12/04/02 <50 <0 50 <0 50 <0 50 <0 50 <50 no no no no no no no no 5660 -3504 no odor I no sheen 02/17/03 110 <0 50 <0 50 <0 50 <0 50 <0 50 no no no no na no no no 5344 -31 88 no odor 1 no sheen 06/02/03 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 74 <0 50 5284 -31 28 no odor 1 no sheen 09/18/03 ns no ns ns no ns no ns ns ns no ns ns ns nm nm not sampled 11!24103 <50 co 50 <0 50 <0 50 <0 50 <0 50 no no no na na no no no 5791 -3635 no odor I no sheen 02/23/04 60 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 59 <0 50 5436 -3280 no odor 1 no sheen 419gmr04 As Project No 1419 47 Page 4 of 13 HORIZON ENVIRONMENTAL INC