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<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 22. A piezometric map for the Williams Fork Alluvium is <br />presented in Figure 23. 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 and <br />• 28. A plot of field electric conductivity versus time is presented in Figure 24. There is no <br />conclusive evidence of seasonal variation of water quality in the alluvium. The field <br />conductivity of Well AVF-5 was above normal in late 1983 and early 1984. The laboratory <br />measurements did not show the same high levels during that period. Only Well AVF-3 is <br />showing an upward trend in dissolved solids. There is also a correlative increase in <br />calcium, magnesium, sulfate and chlorides. The source of this change is not known. <br />However, it is unlikely due to mine discharge because its location and the dissimilar <br />chemical composition of mine discharge. Also, it is unlikely due to the waste water lagoon <br />because the conductivities in the well exceed the levels-measured in waste water. <br />• <br /> <br />