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. 2.05.6 <br />• <br />U <br />TR-026 <br />f~ P PRovE rj <br />9/~ y~os <br />Mountain Canal is 6.0 mg/I with values ranging from 2 to 26 mg/1. A 0.1 mg/I <br />increase in Chloride is not considered significant. <br />Based upon the above calculation, the clarified mine discharge into the Fire <br />Mountain Canal will not have a measurable impact on the quality of water in <br />the river. <br />Clarified mine water discharge into the Deer Trail Ditch is not considered <br />because there is no agricultural or domestic use of the Deer Trail Ditch water <br />downstream of the point where the mine water enters the Ditch. <br />The average TDS measurement at the upstream Fire Mountain Canal <br />monitoring station for the operation period (2002 AHR) is 84 mg/I. The Fire <br />Mountain Canal does not have low flow, it either flows at its 170 cfs +/- <br />capacity or it is empty. The following table presents the estimated affect the <br />mine discharge will have on the quality of water in the Fire Mountain Canal: <br />PHC Fire Mountain Canal <br /> Flow m Flow cfs TDS <br />Canal 76,296 170 84 <br />Mine Dischar a 175 0.39 1500 <br />Combined Flow 76,471 170.39 87 <br />Based upon the above calculation, the mine discharge into the Fire Mountain <br />Canal will not have a measurable impact on the quality of water in the river. <br />As stated in section 2.04.7, if continuous mine discharge occurs, the effluent <br />will be piped over or around the Deer Trail Ditch and the Fire Mountain Canal <br />to avoid any potential quality degradation. At a continuous mine discharge <br />rate of 175 gallons per minute, the Deer Trail Ditch would take on the <br />characteristics ofmine water. As demonstrated above the degradation to the <br />Fire Mountain Canal is not significant. <br />The sediment laden water conveyed by the Deer Trail Ditch and Fire <br />Mountain Canal tends to seal the bottom and banks of the ditch and canal <br />which minimizes seepage. Thus, seepage of mine water from the ditch or <br />canal into the ground water system is considered negligible. <br />2.05 - 73ii - 9/1s/o3 <br />