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TABLE 1 <br /> Groundwater Monitoring Data <br /> Former Beacon Station No 12419 <br /> 2350 Waterloo Road, Stockton, California <br /> ethyl- Depth to TOC GW <br /> Welt TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation <br /> Number Date (ug1L) (ug1L) (ug1L) (ug1L) (ug/L) (ug1L) (u /L) (ug/L) (ug1L) (ug1L) (ug1L) (ug1L) (ug1L) (ug/L) (feet) (feet sea level)(feet sea level) Comments <br /> MW-3 1 03/31/98 780 22 2 32 7 <50 na na na na na na na na 4827 21 38 -2689 <br /> screened 06110/98 220 26 18 056 1 8 <50 na na na na na na na na 4267 -21 29 <br /> interval 09/08/98 3800 420 180 260 280 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 4721 -2583 etroleum odor 1 no sheet <br /> 65'-85' 11112/98 2065 wellhead survey <br /> 12130/98 620 18 099 17 14 <5 0 na na na na na na na na 4556 -2491 slight odor 1 no sheen <br /> 03/26/99 63 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 56 <50 <5 0 na na 4126 -2061 slight odor 1 no sheen <br /> 06/02/99 74 17 13 23 078 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 31 <0 50 4076 -2011 slight odor 1 no sheen <br /> 06/31/99 3000 270 120 260 250 <0 50 <0 50 <0 50 <0 50 69 <50 <50 48 <0 50 4570 -2505 no comment <br /> 12109199 <50 17 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 12 <0 50 4722 -2657 <br /> 02/21/00 1600 160 350 43 140 <0 50 <0 50 <0 50 <0 50 <5 0 <50 10 14 64 4569 -2504 slight odor 1 no sheen <br /> 05/18/00 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 4087 -2022 no odor 1 no sheen <br /> 09/26/00 270 92 28 15 16 <5 0 na na na na na na na na 4899 -2834 no odor 1 no sheen <br /> 12/21/00 830 45 19 45 <0 50 <5 0 na na na na na na na na 4759 -2694 slight odor 1 no sheen <br /> MW-4 03/31198 75 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4792 2000 -2792 <br /> screened 06/10198 58 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4221 -2221 <br /> interval 09/06/98 50 1 3 1 4 <0 50 24 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 4664 -2664 no odor/no sheen <br /> 48'-70 11/12/98 1 2000 wellhead survey <br /> 12/30/98 68 1 14 087 <0 50 1 1 <5 0 na na na na na na na na 4500 -2500 no odor 1 no sheen <br /> 03/26/99 74 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <20 na na 4075 2075 no odor 1 no sheen <br /> 06/02/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 32 <0 50 4019 2019 no odor 1 no sheen <br /> 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 <br /> 12/09/99 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 69 <50 <50 49 <0 50 4656 -2656 <br /> 02/21/00 68 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 30 <0 50 4494 -2494 no odor 1 no sheen <br /> 05/18/00 62 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <5 0 na na 3923 -1923 no odor 1 no sheen <br /> 09/26/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4855 2855 no odor 1 no sheen <br /> 12/20/00 <50 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4698 -2698 no odor 1 no sheen <br /> o0xis <br /> 5419 Page 2 of 6 HORIZON ENVIRONMENTAL INC <br /> 4194141 <br />