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SURFACE WATER MONITORING <br />RIVERS <br />There are two rivers in the vicinity of the mine site. The Yampa, flows in a <br />southeasterly direction across the mine site. The Yampa River drains most of the <br />northeast corner of Colorado and part of south-central Wyoming. The second river is <br />the Williams Fork, which is a major tributary of the Yampa River. The Williams Fork <br />River joins the Yampa River on the mine property. Monitoring data is collected for the <br />Williams Fork River. Monitoring data is also collected from one spring, the #1 Strip Pit <br />(NPDES site 022). In 1995 there was no discharge from the sediment ponds. <br />FLOWS <br />The Williams Fork River flow data is collected by the U.S. Geologic Survey at one <br />O continuous gaging station and one staff gage. The Williams Fork River continuous <br />gaging station (WF-2) is 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 1995 was taken from magnetic <br />format data provided by the USGS. Due to the recent federal government shutdown, <br />only the data through September, 1995 is available. A plot of daily mean flow versus <br />time for the Williams Fork River for 1995 is presented in Figure 22. For the Williams <br />Fork River at Cyprus Empire Corporation, flows measured by the USGS during <br />calendar year 1995 showed a maximum daily flow of 2150 cfs and a minimum daily <br />flow of 30 cfs. Monthly minimum, maximum and mean flows are plotted for each <br />C-81044 1995 AHR (Revised 1/97) Page 9 <br />