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<br />' The historic base level of dissolved solids and conductivity, measured during <br />' spring runoff, was approximately the same at both sites on Foidel Creek: <br />approximately 500 mg/L. Since 1981 the base level has been increasing and is <br />' now approximately 1000 mg/L. This is due to the effects of other mines upstream <br />of Mine No. 3. Peak levels are not increasing but the irrigation season level <br />has increased to approximately 2000 to 2500 mg/L. A similar trend is occurring <br />' in the downstream station on Middle Creek (Site 29). The spring runoff <br />dissolved solids at Site 29 has increased from 400 mg/L to 600 mg/L. Also the <br />' peak levels have not increased but the irrigation season level has increased <br />from approximately 800 mg/L to approximately 1500 mg/L. This increase is <br />' probably more due to upstream mining activities than to the effects of Mine No. <br />3. Other than increased levels of sodium, sulphate, and SAR in the stream no <br />' other significant water quality impacts due to mining have been detected. The <br />increase in SAR levels during irrigation season is not sufficient to cause <br />material damage. <br /> <br /> <br /> <br /> <br />1 <br />1 <br /> <br /> <br />1 <br />1 <br />-6- <br />1 <br />