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' mmhos/cm, (a similar trend) occurring in the downstream station on Middle Creek (Site 29). <br />The spring runoff conductivity at Site 29 has increased from 400 mmhos/cm to 1500 mmhos/cm. <br />' Also the imgation season level has increased from approximately 1500 mmhos/cm to <br />approximately 2500 mmhos/cm. the higher peak levels of conductivity in the streams in 1990 <br />' are probably due to the abnormally low stream flows in the summer of 1990. This increase is <br />probably more due to upstream mining activities than to the effects of Mine No. 3. Other than <br />' increased levels of sodium, sulphate, and SAR in the stream, no other significant water quality <br />impacts due to mining have been detected. The increase in SAR levels during irrigation season <br />' is not sufficient to cause material damage. <br />-6- <br />