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t <br />' a slight downward trend; however, the corresponding dissolved <br />solids values do not show the same downward trend. The tables <br />' include all data collected through 1988. <br />COAL <br />' Flows <br />A plot of the measured discharges for No. 5 Mine is presented on <br />' Figure 18. The flows were measured at the discharge by a <br />totalizing flow meter on the dewatering sump pumps. The mean flow <br />rate did not exceed the predicted values of 760 to 890 gpm for the <br />No. 5 Mine. The 1988 average discharge from the No. 5 Mine was 625 <br />' gpm. While mining has begun in the E seam (No. 6 Mine), the <br />discharge is insignificant and therefore is not accounted for in <br />these evaluations. The average discharge from the No. 5 Mine is <br />' higher than it would be under normal operating conditions. For <br />approximately three weeks in August and September the dewatering <br />pumps were operated on manual settings to lower the water level in <br />the sump. During this period the pumping rate was 1000 to 1300 gpm <br />1 Water Quality <br />' Summaries of the water quality data for the mine discharge are <br />presented in Tables 19 and 20. The mine discharge is NPDES <br />discharge point No. 003. The mine discharge water quality has been <br />' generally constant through time. A plot of dissolved solids is <br />presented in Figure 20. It does indicate that the average <br />dissolved solids in the discharge water have increased from about <br />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 <br />May 1985. This increase in dissolved solids has leveled off in <br />1986. Other than one relatively high reading in 1987, the <br />' dissolved solids appear to still be level at approximately 900 mg/1 <br />in 1987. In 1988 the dissolved solids concentration increased to <br />930 mg/1. Since the dissolved solids level is still within the <br />range used in the low flow mass balance prediction, it will not be <br />' significantly affected. No violations of the NPDES permit were <br />detected in 1988. <br />' ALLUVIUM <br />Sediments in the Williams Fork River Alluvium (3 wells) are <br />' monitored. All three wells are in the general area of the loadout <br />facilities and underground discharge sediment ponds. <br />Water Levels <br />' Ground water levels in the alluvium have remained fairly regular, <br />with normal seasonal fluctuations apparently related to changes in <br />' river levels and an increase in 1984 due to increased runoff <br />3 <br />beginning the spring of that year. Ground water levels in the <br /> <br />