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2.05.6 <br />C J <br /> <br />PR-06 <br />/i PPkovED <br />/~/S /O L <br />occurred February 17, 1978, is for the period of record from 1934 through <br />1995 and is measured upstream of the Town of Somerset, CO. <br />As explained in Section 2.04.7, it is anticipated the Bowie No. 2 Mine will <br />experience mine inflow similar to the Bowie No. 1 Mine. During the 1995 - <br />1996 reporting period, the inflow to the Bowie No. 1 Mine was less than 10 <br />gallons per minute. However, for the purposes of the PHC, it will be <br />assumed the Bowie No. 2 Mine will discharge water similar to the <br />Sanborn Creek Mine (175 gpm, TDS 2761 mg/I, Cond. 3776 uhmos/cm, ref. <br />OCM 1995 AHR). <br />The maximum TDS measurement at the upstream North Fork of the <br />Gunnison River monitoring station during the period 1996 - 1998 was 160 <br />mg/I. The following table presents the estimated affect the mine discharge <br />will have on the quality of water in the North Fork of the Gunnison River: <br />PHC North Fork of the Gunnsion River <br /> Flow m Flow cfs TDS <br />North Fork 11,220 25 160 <br />Mine Dischar e 175 0.39 2761 <br />Combined Flow 11,395 25.39 200 <br />Based upon the above calculation, the mine discharge into the North Fork of <br />the Gunnison River will not have a measurable impact on the quality of water <br />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 mine discharge rate of 175 <br />gallons per minute, the Deer Trail Ditch would take on the characteristics of <br />mine water which is unsuitable for long term irrigation because of its salt <br />load. The degradation to the Fire Mountain Canal would not be as severe, <br />but would be unacceptable. <br />2.05 - 73 - osiot <br />