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• flows measured by the USGS during calendar year 1996 showed a maximum mean <br />daily flow of 1910 cfs and a minimum mean daily flow of 48 cfs. Monthly minimum, <br />maximum and mean flows are plotted for each month of record in Figure 23 The flows <br />in the Williams Fork River during 1998 appear to be about average for the period of <br />record. These flows including comparison between upgradient, WF-1, and <br />downgradient, WF-2, measured to date, do not show any stream depletion impacts from <br />mine dewatering. <br />WATER QUALITY <br />Summaries of the water quality data are presented in Tables 27 through 30. A plot of <br />upstream and downstream dissolved solids measurements for the river is presented in <br />Figure 24. The data indicates that the surface water quality does not show any <br />significant variation from expected values. The comparisons of data from the upstream <br />and downstream station on the Williams Fork River indicate that there is no detectable <br />effect of mining on river water quality. As expected, dissolved solids decrease with <br />increasing flow rate in the rivers. This is due to the effects of snow melt and high rainfall <br />diluting the water. <br />SPRINGS <br />FLOWS <br />One spring on the mine site area is being monitored. The spring is the #1 Strip Pit <br />Discharge. The #1 Strip Pit Discharge is an NPDES monitoring point (Outfall 022). <br />• C~1-0a 1999AHR Page 10 <br />