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occurring in the downstream station on Middle Creek (Site 29). The spring <br /> ' runoff conductivity at Site 29 has increased from 400 mmhos/cm to 1200 <br /> mmhos/cm. Also the irrigation season level has increased from approximately <br /> ' 1500 mohos/cm to approximately 3000 mnhos/cm. The higher peak levels of <br /> conductivity in the streams in 1989 are probably due to the abnormally low <br /> stream flows in the summer of 1989. This increase is probably more due to <br /> upstream mining activities than to the effects of Mine No. I. Other than <br /> increased levels of sodium, sulphate, and SAR in the stream, no other <br /> ' 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 /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> - 6 - <br />