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1 <br />1 <br />Coal <br />' Flows <br />' A plot of the measured discharges for No. 5 Mine is presented on Figure <br />18. The flaws were measured at the discharge by a totalizing flow meter <br />on the dewatering sump pumps. The mean flow rate did not exceed the <br />predicted values of 760 to 890 gpm for the No. 5 Mine. The 1987 average <br />discharge from the No. 5 Mine was 554 gpm. While mining has begun in the <br />E seam (No. 6 Mine), the discharge is insignificant and therefore is not <br />' accounted for in these evaluations. <br />Water Quality <br />1 Summaries of the water quality data for the mine discharge are presented <br />in Tables 19 and 20. The mine discharge is NPDES discharge point No. 003. <br />' The mine discharge water quality has been generally constant through time. <br />A plot of dissolved solids is presented in figure 19. It indicates that <br />the average dissolved solids in the discharge water have increased from <br />' about 790 mg/1 in 1982 and 1983 to approximately 890 mg/1 in 1986. This <br />increase may be due to the longwall mining which was initiated in May <br />1985. This increase in dissolved solids has leveled off in 1986. Other <br />than one relatively high reading in 1987, the dissolved solids appear to <br />' still be level at approximately 900 mg/L in 1987. Since the dissolved <br />solids do not appear to be increasing further and they are not <br />significantly higher than previously estimated, the low flow mass balance <br />' prediction will not be significantly affected. No violations of the NPDES <br />permit were detected in 1986. <br />t ALLUVIUM <br />Sediments in the Williams Fork River Alluvium (3 wells) are monitored. <br />All three wells are in the general area of the loadout facilities and <br />underground discharge sediment ponds. <br /> <br />Ll <br /> <br /> <br />1 <br />Water Levels <br />Ground water levels in the alluvium have remained fairly regular, with <br />normal seasonal fluctuations apparently related to changes in river <br />levels and an increase in 1984 due to increased runoff beginning the <br />spring of that year. Ground water levels in the alluvium are plotted in <br />Figure 20. A piezometric map for the Williams Fork Alluvium (December <br />1987) is presented in Figure 21. <br />Water Quality <br />Summaries of the water quality data <br />in Tables 21 through 26. A plot of <br />time is presented in Figure 22. <br />for the alluvial wells are presented <br />field electrical conductivity versus <br />1 <br />