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an indication of the expected post mining TDS concentrations in rubbelized zone and <br />underground mine workings. Likewise, this decrease illustrates the effects of flushing <br />upon the TDS concentrations with normal periodic discharge. <br />ALLUVIUM <br />Sediments in the Williams Fork River Alluvium are monitored. Three wells are in the <br />general area of the loadout facilities and underground discharge sediment ponds. <br />WATER LEVELS <br />Groundwater levels in the alluvium have remained fairly regular, with normal seasonal <br />fluctuations, apparently related to changes in river levels. Groundwater levels in the <br />alluvium are plotted in Figure 19. A piezometric map for the Williams Fork Alluvium is <br />presented in Figure 20. The data indicates no impact on alluvial water levels related to <br />mining. <br />WATER QUALITY <br />Summaries of the water quality data for the alluvial wells are presented in Tables 23 <br />through 28. A plot of field electric conductivity versus time is presented in Figure 24. <br />There is no conclusive evidence of seasonal variation of water quality in the alluvium. <br />The field conductivity of Well AVF-5 was above normal in late 1983 and early 1984. The <br />laboratory measurements did not show the same high levels during that period. Only <br />Well AVF-3 has shown an upward trend in dissolved solids to above 2000 mg/L. The <br />concentration has decreased to below 2000 mg/L in 1993 and 1994. There is also a <br />C-07-004 7994 AHR Page 7 <br />