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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 Well TPHg benzene toluene benzene xylenes MTBE DIPE ETBE TAME TBA methanol ethanol EDC EDB GW Elevation Elevation Number Date (ug/L) (ug/L) (ug/L) (ug1L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug1L) (ug/L) (ug/L) (ug/L) (feet) (feet sea level) (feet sea level) Comments MW-3 03/31/98 780 22 2 32 7 <50 na na na na na na na na 4827 2138 -2689 screened 06/10198 220 26 1 8 056 1 8 <50 na na na na na na na na 4267 -2129 interval 09/08/98 3800 420 180 260 280 <0 50 <0 50 <0 50 <0 50 <50 <50 <50 na na 4721 -2583 etroleum odor 1 no Sheen 65'-85' 11/12/98 2065 wellhead survey 12/30/98 620 18 099 17 14 <5 0 na na na na na na na na 4556 -2491 slight odor/no sheen 03/26/99 63 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 56 <50 <50 na na 41 26 -2061 slight odor 1 no sheen 06/02199 74 1 7 1 3 23 078 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 31 <0 50 4076 -2011 slight odor 1 no sheen 08/31199 3000 270 120 260 250 <0 50 <0 50 <0 50 <0 50 69 <50 <5 0 48 <0 50 4570 -2505 no comment 12/09/99 <50 17 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 12 <0 50 4722 -2657 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 05/18/00 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 na na 4087 -2022 no odor 1 no sheen 09/26100 270 92 28 15 16 <50 na na na na na na na na 4899 -2834 no odor/no sheen MW-4 03/31/98 75 <0 50 <0 50 <0 50 <0 50 <50 na na na na na na na na 4792 2000 -2792 screened 06/10198 58 <0 50 <0 50 <0 50 <0 50 <5 0 na na na na na na na na 4221 -2221 interval 09/08/98 50 13 14 <0 50 24 <0 50 <0 50 <0 50 <0 50 <50 <50 <5 0 na na 4664 -2664 no odor/no sheen 48'-70' 11/12/98 2000 wellhead survey 12/30/98 68 14 087 <0 50 1 1 <5 0 na na na na na na na na 4500 -2600 no odor/no sheen 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/no sheen 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 08131199 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <5 0 <50 <50 43 <0 50 4509 -2509 no comment 12/09199 <50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 69 <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 <5 0 <50 <5 0 30 <0 50 4494 -2494 no odor 1 no sheen 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 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/no sheen I 419gmr90 As 141941 Page 2 of 6 HORIZON ENVIRONMENTAL INC