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• 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 as 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 21 <br />through 26. A plot of field electric conductivity versus time is presented in Figure 21. <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 had decreased to below 2000 mg/L in 1993 and 1994 but returned to <br />above 2000 mg/L in 1995 and stayed fairly consistent through 1997; however, it is still <br />within the range established during the period of 1988 to 1995 and does not appear to <br />represent a significant change. There is also a correlative increase in calcium, <br />• magnesium, sulfate and chlorides. The source of this change is not known. However, it <br />C-81-044 1997 AHR Page 8 <br />