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TaBI� <br /> GROUNDWATER MO TORING DATA <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road,Stockton,California <br /> ethyl Depth to TOC GW <br /> Well TPH9 benzene totuene benzene xylenes MTBE DIPE ETRE TAME TBA methanol ethanol DCA EDB GW Elevatton Elevation <br /> Number Date I (ug/L) (ug/L) (ug/L) (ug1L) (ug/L) (uglL) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments <br /> MW 9 11/12/98 ns ns ns ns ns ns ns ns ns ns ns ns ns ns 2065 wellhead survey <br /> screened 12/30/96 1500 73 to 160 64 <25 0 na na na na na na na na 4559 2494 slight odor/no sheen <br /> interval 03/26/99 1300 54 58 110 15 <0 50 <0 50 <0 50 <0 50 11 <50 <5 0 ria na 4139 2074 no odor 1 no sheen <br /> 41 66 06/02/99 1300 16 25 76 24 <0 50 <0 50 <0 50 <0 50 13 <50 <50 16 <0 50 4074 2009 no odor/no sheen <br /> 08/31/99 2400 140 21 460 280 055 <0 50 <0 50 <0 50 93 <50 <50 42 <0 50 4562 2497 no comment <br /> 12/09/99 1600 86 65 200 fit 079 <0 50 <0 50 <0 50 10 <50 <50 1 3 <0 50 4726 2661 <br /> 02121!00 1900 50 18 100 60 055 <0 50 <0 50 <0 50 10 150 86 95 <o 50 4581 25 16 slight odor I no sheen <br /> 05/18/00 790 96 081 76 21 <0 50 <0 50 <0 50 <0 50 12 <50 <5 0 na na 4089 2024 slight odor!no sheen <br /> 09/26/00 680 1 1 <0 50 31 087 <50 na na na na na na na na 4695 2830 slight odor/no sheen <br /> 12/21100 1400 16 t 1 40 120 <5 0 na na na na na na na na 4762 2697 slight odor 1 no sheen <br /> 03!27101 1700 fit 14 23 220 <5 0 na na na na na na na na 4637 2572 slight odor/no sheen <br /> 06126/01 390 5 t 065 44 27 <0 50 <0 50 <0 50 <0 50 85 <50 <5 0 68 <0 50 4899 2834 slight odor 1 no sheen <br /> 09105101 410 1 1 <0 50 <0 50 46 <5 0 na na na na na na na na 5411 3346 no odor 1 no sheen <br /> 1150101 750 72 1 4 31 15 <50 na na na na na na na na 5411 3346 no odor/no sheen <br /> 02/27/02 650 12 35 14 23 6 0 na na na na na na na na 5078 3013 no odor 1 no sheen <br /> 05/16702 1100 72 10 3 1 67 <0 50 <0 50 <0 50 <0 50 58 <50 <5 0 12 <0 50 5092 2221 2871 no odorno sheen <br /> 09/13/02 2800 110 33 130 200 <50 na na na na na na na na 5908 3687 slight odor 1 no sheen <br /> 12/04/02 980 31 is 21 39 <50 na na na na na na na na 5734 3513 odor 1 no sheen <br /> 02/17/03 900 20 1 4 42 26 <0 50 na na na na na na na na 54 OB 31 87 no odor 1 no sheen <br /> 06/03703 2800 140 1 7 130 120 4 50 <0 50 <0 50 <0 50 58 <50 <5 0 15 <0 50 5347 31 26 no odor 1 no sheen <br /> 09/18/03 2800 430 23 79 170 <5 0 no na na na na na na na 5991 3770 no odor!no sheen <br /> 11124/03 1800 190 27 19 76 <0 50 na na na na na na na na 5066 3645 no odor!no sheen <br /> 02/23104 1200 40 075 77 59 <0 50 40 50 <0 50 <0 50 67 <50 <50 26 <0 50 55 15 3294 odor 1 no sheen <br /> 06/07104 2200 420 57 44 92 <10 na na na na na na na na 5557 3336 odor no sheen <br /> 09107/04 1800 230 25 51 140 <1 5 na na na na na na na na 61 96 3975 odor no sheen <br /> 12 10104 2100 290 13 23 37 <5 0 na na na na na na na na 5961 3740 odor 1 no sheen <br /> 1 <br /> 419gmr04 xis Page 9 of 13 HORIZON ENVIRONMENTAL INC <br /> Project No 141947 <br />