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measured in the wastewater (approximately 1500 mg/I) and the water discharged to the <br />lagoon is primarily Trout Creek Sandstone water, typically strongly sodium-bicarbonate <br />water. <br />SURFACE WATER MONITORING <br />R/VERS <br />There are two rivers in the vicinity of the mine site. The Yampa, flows in a southeasterly <br />direction across the mine site. The Yampa River drains most of the northeast corner of <br />Colorado and part of south-central Wyoming. The second river is the Williams Fork, <br />which is a major tributary of the Yampa River. The Williams Fork River joins the Yampa <br />River on the mine property. Monitoring data is collected for the Williams Fork River. <br />Monitoring data is also collected from one spring, the #1 Strip Pit (NPDES site 022). <br />FLOWS <br />The Williams Fork River flow data is collected by the U.S. Geologic Survey at one <br />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 the <br />#5 Mine discharge. The staff gage (WF-1) is located upstream of the mine discharge <br />points. The flow data for Station WF-2 for 1998 was provided by the USGS. Only the <br />data through September, 1998 was available. Data for Oct. -Dec. 1997 is included in <br />this report as well as this information was not available for inclusion with last years <br />AHR. A plot of daily mean flow versus time for the Williams Fork River for 1998 is <br />presented in Figure 22. For the Williams Fork River at Cyprus Empire Corporation, <br />• C-81~W0 1998 AHR Page 9 <br />