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upgradient and downgradient locations. The comparisons of data from the upstream and downstream <br />• station on the Williams Fork River indicate that there is no detectable effect of mining on river water quality. <br />As expected, conductivity decreases with increasing Flow rate in the rivers. This is due to the effects of snow <br />melt and high rainfall 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 Discharge. The #1 Strip <br />Pit Discharge is a NPDES monitoring point. There are a few other springs and local permanent 'damp <br />spots" in the area; however, their combined flow is normally less than 10 gpm and are, therefore, not <br />significant. The measured discharges for the #1 Strip Pit are presented in Figure 28. The discharges show <br />a normal seasonable runoff period, with low Flows in the winter and early spring. Many of the flows were <br />so low, in part due to freezing, that they could not be measured. <br />C~ <br />The average discharge from the #1 Strip Pit in 1997 was 29 gpm. The discharge from the #1 Strip Pit <br />increased significantly in 1989. This may have been due to seepage from the ditch that conveys the 7 <br />North Angle discharge. The 7 North Angle discharge began in January of 1989. However, discharge rates <br />in 1990 and 1991 are considerably lower and within the range observe during 1982 through 1986. <br />Nevertheless, snowmelt and ditch seepage both appear to have some influence on the Strip Pit discharge <br />as the seepage dropped to just a few gpm in November through January following the decline in 7 North <br />Angle discharge in mid October, 1990. Even though the 7 North Angle discharge remained zero through <br />April, 1991, the #1 Strip Pit discharge increased in February through April reflecting the influence of snow <br />melt recharge. <br />9 <br />