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Table 1 <br /> Groundwater Monitoring Data <br /> Former Beacon Station No.419 <br /> 2350 Waterloo Road,Stockton,California <br /> Well Date TPHg Benzene Toluene E-benzene Xylenes Depth to TOC GW <br /> Number u U&I u ugfL ugIL GW Elevation Elevation Comments <br /> MW-1 03/31/98 65 <0 50 <0 50 <0 50 <0 50 48 04 2111 -26 93 <br /> (screened 06/10/98 <50 <0 50 <0 50 <0 50 <0 50 4250 -2139 <br /> interval= 09/08/98 230 8 1 0 58 <0 50 0 72 4695 -25 84 no odor/no sheen <br /> 65'-85') 11/12/98 2036 Wellhead Survey Data <br /> 12/30/98 87 <0 50 <0 50 <0 50 <0 50 45 33 -2497 no odor/no sheen <br /> 03/26/99 55 <0 50 <0 50 <0 50 <0 50 4W6 -2080 no odor/no sheen <br /> MW-2 03/31/98 94 <0 50 <0 50 <0 50 <0 50 4826 21.35 -2691 <br /> (screened 06/10/98 <50 <0 50 <0 50 <0 50 <0 50 4267 -2132 <br /> interval= 09/08/98 98 <0 50 <0 50 <0 50 <0 50 4731 -2596 no odor 1 no sheen <br /> 65'-85') 11/12/98 20.59 Wellhead Survey Data <br /> 12/30/98 84 <0 50 <0 50 <0 50 <0 50 4555 -24 96 no odor/no sheen <br /> 03/26/99 78 <0 50 <0 50 <0 50 <2 0 4125 -2066 no odor 1 no sheen <br /> MW-3 03/31/98 780 220 2 0 3 2 7 0 48 27 21.38 -2699 <br /> (screened 06/10/98 220 2 6 18 0 6 18 4267 -2129 <br /> interval= 09/08/98 3,800 420 180 260 280 4721 -2583 Petroleum odor/no spec <br /> 65'-85') 11/12/98 2065 Wellhead Survey Data <br /> 12/30/98 620 18 099 17 14 4556 -24 91 slight odor/no sheen <br /> 03/26/99 63 <0 50 <0 50 <0 50 <0 50 4126 -2061 slight odor/no sheen <br /> MW4 03/31/98 75 <0 50 <0 50 <0 50 <0 50 4792 20,00 -2792 <br /> (screened 06/10/98 58 <0 50 <0 50 <0 50 <0 50 42 21 -2221 <br /> interval= 09/08/98 50 13 14 <0 50 2 4664 -2664 no odor/no sheen <br /> 48'-70') 11/12/98 20.00 Wellhead Survey Data <br /> 12/30/98 68 14 087 <0 50 1 1 45 00 -2500 no odor/no sheen <br /> 03/26/99 74 <0 50 <0 50 <0 50 <0 50 4075 -2075 no odor/no sheen <br /> MW-5 03/31/98 75 <0 50 <0 50 <0 50 <0 50 4846 2043 -2803 <br /> (screened 06/10/98 <50 <0 50 <0 50 <0 50 <0 50 4272 -2229 <br /> interval= 1 09/08/98 <50 12 091 <0 50 0 94 46 92 -26 49 no odor/no sheen <br /> 48'-71') 11/12/98 2043 Wellhead Sunev Data <br /> 12/30/98 110 067 <0 50 <0 50 <0 50 4545 -2502 no odor/no sheen <br /> 03/26/99 67 <0 50 <0 50 <0 50 <0 50 4126 -20 833 no odor/no sheen <br /> 99QMTable Q1 Page 1 of 2 HORIZON ENVIRONMENTAL, INC. <br />