Laserfiche WebLink
1 .. <br />SURFACE WATER MONITORING <br />Two locations on Fish Creek in the vicinity of the tipple are monitored. <br />' Station 27a is immediately upstream of the point where the tipple <br />sedimentation pond discharges into Fish Creek. Station 1003 is <br />approximately one mile downstream. ' <br />Flows <br />The stream is gauged at both surface water stations. Typically, due to the <br />' size of the stream they must be rated instead of using a more accurate <br />controlled section such as a flume. However, during extreme low flow <br />periods a cutthroat flume is used to rate the stream. Flow measurements have <br />been collected from Station 1003 since March, 1984 and from Station 27a <br />' since March, 1985. The flow data for the two stations at the discharge site <br />is summarized on Table 8. A plot of the historic flow measurements are <br />presented on Figure 6. The data shows the typical seasonal variation with a <br />' rapid rise and fall of flow rates during spring runoff. The limited data <br />indicates a good correlation between Stations 27a and 1003. The minimum <br />' measured flows during water year 1987 were 5 cfs at Station 27a and 3.9 cfs <br />at site 1003. The historic low flows at the sites are less than 2 cfs at <br />' site 27a and 3 cfs at Station 1003. These minimums do not include frozen <br />periods during the winter. During the 1987 water year the flows were lower <br />' than the three previous years. <br />Water Quality <br />Water quality samples are collected from both sites on a regular basis. The <br />' water quality summaries are presented on Tables 9 to 12. Plots of historic <br />field conductivity is presented on Figure 7. The figure and tables show <br />' r.liat there is no indicated effect from the tipple discharge on the surface <br />water quality. The water quality for the up and downstream sites is almost <br />identical. The only significant change observed in the data is an increase <br />in the mean dissolved solids concentration at both sites in I986 and 1987. <br />The data shows tha typical pattern for dissolved solids. Dissolved solids <br />' increase with decreasing flow rate, and decrease with increasing flow rate. <br />The increase in dissolved solids that began at the end of 1986 is probably <br />' due to the decreased average flow rate. <br />- 3 - <br />