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Table i Groundwater Monitoring Data Former Beacon Station No 419 2350 Waterloo Road,Stockton,California Well Date TPHg Benzene Toluene E-benzene Xylenes Depth to TOC GW Number ug/L ug/L ug/L ug/L ug/L GW Elevation Elevation Comments MW-1 03/31/98 65 <0 50 <0 50 <0 50 <0 50 4804 2111 -26 93 06/10/98 <50 <0 50 <0 50 <0 50 <0 50 4250 -2139 09/08/98 230 8 1 058 <0 50 072 4695 -25 84 no odor/no sheen 11/12/98 2036 Wellhead Survey Data 12/30/98 87 <0 50 <0 50 <0 50 <0 50 4533 -2497 no odor/no sheen MW-2 03/31/98 94 <0 50 <0 50 <0 50 <0 50 4826 2135 -2691 06/10/98 <50 <0 50 <0 50 <0 50 <0 50 42 67 -2132 09/08/98 98 <0 50 <0 50 <0 50 <0 50 4731 -2596 no odor/no sheen 11/12/98 2059 Wellhead Survey Data 12/30/98 84 <0 50 <0 50 <0 50 <0 50 4555 -2496 no odor/no sheen MW-3 03/31/98 780 220 2 0 3 2 7 0 4827 21.38 -2689 06/10/98 220 2 6 1 8 0 6 1 8 4267 -2129 09/08/98 3,800 420 180 260 280 4721 -2583 Petroleum odor/no sheen 11/12/98 2065 Wellhead Survey Data 12/30/98 620 18 099 17 14 4556 -2491 slight odor/no sheen MW4 03/31/98 75 <0 50 <0 50 <0 50 <0 50 4792 20.00 -2792 06/10/98 58 <0 50 <0 50 <0 50 <0 50 4221 -2221 09/08/98 50 13 I 4 <0 50 2 4664 -2664 no odor/no sheen 11/12/98 2000 Well:iead Survey Data 12/30/98 68 14 0 87 <0 50 1 1 4500 -2500 no odor/no sheen MW-5 03/31/98 75 <0 50 <0 50 <0 50 <0 50 4846 20.43 -2803 06/10/98 <50 <0 50 <0 50 <0 50 <0 50 4272 -2229 09/08/98 <50 12 0 9l <0 50 094 4692 -2649 no odor/no sheen 11/12/98 20.43 Wellhead Survey Data 12/30/98 110 067 <0 50 <0 50 <0 50 4545 -2502 no odor/no sheen MW-6 03/31/98 110 <0 50 <0 50 <0 50 <0 50 4836 20.66 -2770 06/10/98 79 <0 50 <0 50 <0 50 <0 50 4268 -2202 09/08/98 <50 0 86 077 <0 50 <0 50 4697 -2631 no odor/no sheen 12/02/98 2065 Wellhead Survey Data 12/30/98 53 <0 50 <0 50 <0 50 <0 50 4557 -2492 no odor/no sheen I 98QM Table 1 Page 1 of 2 HORIZON ENVIRONMENTAL INC