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RAG, Empire Corporation 1999 AHR <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 as Figure 20. The data indicates no impact on alluvial water levels related <br />to 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. <br />The laboratory measurements did not show the same high levels during that period. <br />Only Well AVF-3 has shown an upward trend in dissolved solids to above 2000 mg/L. <br />The concentration had decreased to below 2000 mg/L in 1993 and 1994 but returned <br />to above 2000 mg/L in 1995. There is also a correlative increase in calcium, <br />magnesium, sulfate and chlorides. The source of this change is not known. However, <br />it is unlikely due to mine discharge because of the discharge's down gradient location <br />. Page 8 <br />