Laserfiche WebLink
• and downstream station on the Williams Fork River indicate that there is no detectable <br />effect of mining on river water quality. As expected, dissolved solids decrease with <br />increasing flow rate in the rivers. This is due to the effects of snow melt and high rainfall <br />diluting the water. <br />SPRINGS <br />FLOWS <br />One spring on the mine site area is being monitored. The spring is the #1 Strip Pit <br />Discharge. The #1 Strip Pit Discharge is an NPDES monitoring point (Ouffall 022). <br />There are a few other springs and local permanent "damp spots" in the area; however, <br />their combined flow is normally less than 10 gpm and is therefore not significant. The <br />• annual discharges for the #1 Strip Pit are presented in Figure 25 and the 1997 <br />discharge measurements are presented on Figure 26. The discharge from the #1 Strip <br />Pit increased significantly in 1989. This may have been due to seepage from the ditch <br />that conveys the 7 North Angle discharge. The 7 North Angle discharge began in <br />January of 1989. However, discharge rates from 1990 through 1993 are considerably <br />lower and within the range observe during 1982 through 1986. Nevertheless, snowmelt <br />and ditch seepage both appear to have some influence on the Strip Pit discharge, as <br />the discharge generally drops to just a few gpm from January through May with a small <br />peak in March coinciding with spring runoff. <br />• C-81-044 1997AHR Page 11 <br />