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<br />gaging <br />station <br />(WF-2) is i <br />near the confluence with the Yampa River, downstream of <br /> the #5 Mine discharge. The staff gage (WF-1) is located upstream of the mine <br />discharge points. The flow data for Station WF-2 for 1996 provided by the USGS. <br />Only the data through September, 1996 is available. Data for Oct. -Dec. 1995 is <br />included in this report as well as this information was not available for inclusion with <br />last year's AHR. A plot of daily mean flow versus time for the Williams Fork River for <br />1996 is presented in Figure 22. For the Williams Fork River at Cyprus Empire <br />Corporation, flows measured by the USGS during calendar year 1996 showed a <br />maximum mean daily flow of 2580 cfs and a minimum mean daily flow of 19 cfs. <br />Monthly minimum, maximum and mean flows are plotted for each month of record in <br />Figure 23. The flows in the Williams Fork River during 1996 appear to be above <br />• normal for the period of record. These flows including comparison between <br />upgradient, WF-1, and downgradient, WF-2, measured to date, do not show any <br />stream 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 />• <br />C-81-044 1996 AHR. I'1EMPIREWHR\96AHR\EMPAHR96.000 Page 11 <br />