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~ SURFACE WATER MONTTORING Two primazy locations on Foidel Creek in the vicinity of the mine portal aze monitored. Station 800 is upstream of the portal and flow is monitored by the USGS (Station 09243800). Water quality is monitored by Cyprus. Station 8 is a short distance downstream of the portal. Four primary locations on Fish Creek are monitored. Station 16 is located upstream of Mine No. 2. This station replaces Site 1001, which was located upstream of the point where Fish Creek enters Twentymile Pazk. Site 1002 is located on Fish Creek about mid-way through its reach in Twentymile Pazk and downstream of the Fish Creek Borehole. Site 27A is located immediately upstream of the Fish Creek Tipple. Site 1003 is located in the north end of Twentymile Park upstream of the confluence with Trout Creek and approximately '/z-1 mile downstream of the tipple. Two sites on Trout Creek are monitored, with a third site being added for reporting in the 1994 AHR. Site 301 is located upstream of the confluence of Middle Creek with Trout Creek and Site 69 is located downstream of the confluence. Site 1005 has been installed below the confluence of Trout and Fish Creeks. In addition, three sites to measure stream stage only were established in 1988; Site 307 on Fish Creek adjacent to We11006-AZ-3, Site 305 on Fish Creek adjacent to We11008-AU-3, and Site 304 on Foidel Creek adjacent to Well 008-AV-2. An additional surface site was installed in early 1994 below the confluence of Trout and Fish creeks (Site 1005), and will be reported beginning with the 1994 AHR. Fish Creek AVF mine area sites are in Appendix B. Flows The streams aze gauged at all six primary locations on Foidel and Fish Creeks. Typically, due to the size of the streams at the measurement locations, they must be rated instead of using a more accurate controlled section such, as a flume. During extremely low flows a cutthroat flume is occasionally used to rate the stream. The flow data for the two streams aze summarized on Table 30. Plots of the historic flow measurements on Foidel Creek are presented on Figures 24 through 27. The data shows the typical seasonal variation with a rapid rise and fall of flow rates during spring runoff. 1993 was a below normal to normal runoff year in Foidel Creek. In other drainages in the azea it was a below normal yeaz. At Foidel Creek Station 8 the flow is maintained essentially year-round by the discharge from the underground mine and dischazges related to the surface mines. The other Foidel Creek stations show limited flow during the 1993 irrigation season. The data from the stations on Fish Creek show the typical seasonal variation. Due to the ~ runoff in 1993, the minimum flows are higher than those of 1992. The flow data for Fish Creek aze presented on Figures 28 through 30 and 41. Minimal increase in flow aze indicated by the Borehole data. No impact from the activities at the Tipple are indicated by the data. Minimal impacts aze expected from Fish Creek Borehole flows in terms of -7- 6/10/94 1:23 pm \•