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1 <br /> SURFACE WATER MONITORING <br /> ' One flow monitoring location on Foidel Creek in the vicinity of Mine 3 is <br /> monitored. USGS Site 09243900 (Site 900) is located approximately one-half <br /> ' mile upstream of the confluence with Middle Creek. Two flow monitoring <br /> locations on Middle Creek are monitored. USGS Site 09243700 (Site 700) is <br /> located approximately one mile upstream of the confluence with Foidel <br /> ' Creek. Site 29 is located approximately one mile downstream of the <br /> confluence with Foidel Creek. <br /> Flows <br /> The streams are gaged at the two USGS sites and at Site 29. Due to the size <br /> ' of the stream at the locations, they must be rated instead of using a more <br /> accurate controlled section such as a flume. The USGS maintains continuous <br /> recorders at Sites 700 and 900. Plots of the historic flow measurements on <br /> Foidel Creek are presented on Figures 12 and 13. Plots of the historic flow <br /> measurements on Middle Creek are presented on Figures 14 through 17. Tire <br /> flow rate data is summarized on Table 14. The data shows the typical <br /> seasonal variation with a rapid rise and fall of flow rates during spring <br /> runoff. Historically all three sites often did not flow during the fall and <br /> winter. Due to the effects of upstream mining activities at other mines <br /> Sites 900 and 29 have normally flowed year-round since 1985. The 1989 water <br /> year was a low flow year. While the peak flow was normal the mean and low <br /> flows were below normal . <br /> Water Quality <br /> ' Water quality samples are collected at all the sites on a regular basis. <br /> ' The water quality summaries are presented on Tables 15 through 20. Plots of <br /> historic water quality data for Foidel and Middle Creek are presented on <br /> ' Figure 18 through 21. The historic base levels of conductivity on Foidel <br /> Creek, measured during spring runoff, was approximately 500 mg/l . Since <br /> 1981 the base level has been increasing and is now approximately 1000 to <br /> 2000 mmhos/cm. This is due to the effects of other mines upstream of Mine <br /> No. 3. Peak levels are increasing slightly and the irrigation season level <br /> ' has increased to approximately 3000 to 3500 mmhos/cm. A similar trend is <br /> - 5 - <br />