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• Water Quality <br />Summaries of the water quality data for the eight 1`tine 1 ponds are presented on Tables 57 <br />through 7l and on Figures d~3 and 49 through 53. The field conductivity solids data shows some <br />typical seasonal variation: the water quality improves during spring runoff. Ponds A, B, D, <br />F, and H appear to be impacted by spoil spring inflows. The discharge rates from Ponds B and <br />H are not significant during irrigation season and therefore these ponds do not cause any <br />significant impacts. The mean 1991 irrigation season field conductivities for ponds A and D are <br />approximately 2700 and 3400 respectively. These values are similar to those measured in the <br />previous three years. These values are also reelected in the conductivity level in Foidel Creek <br />at Sta[ion 8 which has a mean irrigation season level of about 2800 umhos/cm. <br />For the ponds affected by spoil springs, increased calcium, magnesium, sulfate, dissolved solids <br />and SAR were observed. No significant changes in parameters were observed for the ponds <br />during [he 1992 water year. <br />The observed Trout Creek conductivity increase between sites during 1992 was not enough to <br />cause material damage, anti occurred during a period of irrigation withdrawals. Also, the water <br />quality of Trout Creek was better than maximum levels predicted in the salt-loading calculations <br />performed as par[ of the "probably hydrologic impacts" section of the mine permit application. <br />Only insignificant discharges during spring runoff were recorded from Mine No. 2 Ponds in <br />1992. Therefore no impacts to Fish Creek were observed. <br />• <br />-13- <br />