Laserfiche WebLink
1 <br /> <br />SURFACE WATER MONITORING <br />' One location on Foidel Creek in the vicinity of Mine 3 is monitored. USGS <br />Site 09243900 (Site 900) is located approximately one-half mile upstream of <br />' the confluence with Middle Creek. Two locations on Middle Creek are <br />monitored. USGS Site 09243700 (Site 700) is located approximately one mile <br />' upstream of the confluence with Foidel Creek. Site 29 is located <br />approximately one mile downstream of the 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 anal 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 and 16. The flow <br /> rate data is summarized on Table 1M1. the data shows the typical seasonal <br />' variation with a rapid rise and fall of flow rates d uring spring runoff. <br /> Historically all three sites often did not flow during the fall and winter. <br /> Due to the effects of upstream mining activities at other mines, Sites 900 <br /> and 29 have flowed year-round since 1985. Peak flows in Middle Creek are <br /> approximately double those in Foidel Creek. The 1988 water year was a low <br /> to medium flow year. <br />' Water Quality <br />' Water quality samples are collected at all the sites nn a regular basis. <br />The water quality surtnnaries are presented on Tables 15 through 20. Picts of <br />' historic water quality data for Foidel and Middle Creek are presented on <br />Figure 19. The historic base levels of conductivity on Foidel CrPP'r., <br />measured during spring runoff, ~.ns approximately 500 mg/1. Since 1981 the <br />hase level has been increasing and is now approximately 700 to lT.OD <br />mrnhos/cm. this is d!rr_ to the effects of other mines upstream of Mine No. <br />' 3. Peak levels are noL increasing but the irrigation season level has <br />increased to approximately 2000 to ?500 mmhos/cm. A similar trend is <br />- 5 - <br />