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RAG, Empire Corporation 1999 AHR <br />collects the Williams Fork River flow data. The Williams Fork River continuous gaging <br />• <br />station (WF-2) is near the confluence with the Yampa River, downstream of the #5 <br />Mine discharge. The staff gage (VVF-1) is located upstream of the mine discharge <br />points. The flow data for Station WF-2 for 1999 was provided by the USGS. Only the <br />data through September 1999 was available. A plot of daily mean flow versus time for <br />the Williams Fork River for 1999 is presented in Figure 22. For the Williams Fork <br />River at RAG Empire Corporation, flows measured by the USGS during calendar year <br />1996 showed a maximum mean daily flow of 1910 cfs and a minimum mean daily flow <br />of 48 cfs. Monthly minimum, maximum and mean flows are plotted for each month of <br />record in Figure 23. The flows in the Williams Fork River during 1999 appear to be <br />about average for the period of record. These flows including comparison between up <br />• ~ gradient, WF-1, and down gradient, WF-2, measured to date, do not show any stream <br />depletion impacts from 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 <br />upstream and downstream station on the Williams Fork River indicate that there is no <br />detectable effect of mining on river water quality. As expected, dissolved solids <br />decrease with increasing flow rate in the rivers. This is due to the effects of snow melt <br />Page 10 <br />