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• The average dissolved solids concentration for the 7 North Angle discharge <br />decreased to about 1000 mg/I in as compared to 1285 mg/I in years 1991 and 1992. <br />This trend is related to the accumulation of water in the North Angle Sump location <br />while the pump was out of order. This water was allowed to equilibrate within old <br />workings and rubbelized subsidence panels. The maximum concentrations of 1474 <br />mg/I represents this equilibrium concentration and also provides an indication of the <br />expected post mining TDS concentrations in rubbelized zone and underground mine <br />workings. Likewise, this decrease illustrates the effects of flushing upon the TDS <br />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 /> <br />C-Bt-044 7995 AHR Page 7 <br />