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SURFACE WATER MONITORING <br />Two primary locations on Foidel Creek in the vicinity of the mine portal are monitored. Station <br />800 is upstream of the portal and flow is monitored by the USGS (Station 09243800). Water <br />quality is monitored by Cyprus. Station 8 is a short distance downstream of the portal. Water <br />quality samples are collected upstream of the nitrate loadout facility and flow readings are taken <br />downstream of the loadout. Four primary locations on Fish Creek aze monitored. Station 16 <br />is located upstream of Mine No. 2. It replaces Site 1001, which was located upstream of the <br />point where Fish Creek enters Twentymile Park. Site 1002 is located on Fish Creek about one- <br />half way through its reach and Twentymile Park, downstream of the Fish Creek Borehole. Site <br />27A is located immediately upstream of the Fish Creek Tipple. Site 1003 is located in the north <br />end of Twentymile Park approximately 1-1 ~fz miles upstream of the confluence with Trout <br />Creek and downstream of the tipple. Two sites on Trout Creek are monitored. Site 301 is <br />located upstream of the confluence of Middle Creek with Trout Creek and Site 69 is located <br />downstream of the confluence. In addition, three sites to measure stream stage only were <br />established in 1988; Site 307 on Fish Creek adjacent to We11006-AZ-3, Site 305 on fish Creek <br />adjacent to Well008-AU-3, and Site 304 on Foidel Creek adjacent to Well 008-AV-2. Due to <br />vandalism in 1990 there are a number of missing data points for stream stage at many of the <br />stations. <br />Flows <br />The streams aze gauged at all six primary locations. Typically, due to the size of the stream at <br />the locations, they must be rated instead of using the more accurate controlled section such as <br />a flume. During extremely low flows a cutthroat flume is occasionally used to rate the stream. <br />The flow data for the two streams are summarized on Table 30. Plots of the historic flow <br />measurements on Foidel Creek are presented on Figures 24 through 27. The data shows the <br />typical seasonal variation with a rapid rise and fall of flow rates during spring runoff. 1990 was <br />a below normal to normal runoff year in Foidel Creek. In other drainages in the area it was a <br />below normal yeaz. At Stations 800 and 8 the flow is maintained essentially year-round by the <br />-6- <br />