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<br /> <br /> <br /> <br />1 <br />SURFACE WATER MONTTORING <br />One flow monitoring location on Foidel creek in the vicinity of Mine 3 is monitored. USGS Site <br />09243900 (Site 900) is located approximately one-half mile upstream of the confluence with <br />Middle Creek. Two flow monitoring locations on Middle Creek aze monitored. USGS Site <br />09243700 (Site 700) is located approximately one mile upstream of the confluence with Foidel <br />Creek. Site 29 is located approximately one mile downstream of the confluence with Foidel <br />Creek. <br />Flows <br />The streams aze gauged at the two USGS sites and at Site 29. Due to the size of the stream at <br />the locations, they must be rated instead of using a more accurate controlled section such as a <br />flume. The USGS maintains continuous recorders at Sites 700 and 900. Plots of the historic <br />flow measurements on Foidel Creek aze presented on Figures 12 and 13. Plots of the historic <br />flow measurements on Middle Creek are presented on Figures 14 through 17. The flow rate <br />data is summarized on Table 14. The data shows the typical seasonal variation with a rapid rise <br />and fall of flow rates during spring runoff. Historically all three sites often did not flow during <br />the fall and winter. Due to the effects of upstream mining activities at other mines Sites 900 and <br />29 have normally flowed year-round since 1985. The 1990 water year was the fourth low flow <br />year in a row. <br />Water Quality <br />Water quality samples are collected at all the sites on a regulaz basis. The water quality <br />summaries are presented on Tables 15 through 20. Plots of historic water quality data for foidel <br />and Middle Creek are presented on figure 18 through 21. The historic base levels of <br />conductivity on Foidel Creek, measured during spring runoff, was approximately 500 <br />mmhos,cm. Since 1981 the base level has been increasing and is now approximately 2000 <br />mmhos/cm. This is due to the effects of other mines upstream of Mine No. 3. Peak levels aze <br />increasing slightly and the irrigation season level has increased to approximately 3000 <br />-5- <br />