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.1 • • <br />COLORADO DEPARTMENT OF ED;ALTH <br />water Quality Control Division <br />4210 East 11th Avenue <br />Denver, Colorado 80220 <br />RATIONALE <br />AMENDMENT U2 <br />TRAPPER MINING, INC. <br />PERMIT NUMBER CO-0032115 <br />. MOFFAT COUNTY <br />By letter of Juae 23, 1986, the permittee has requested that an additional <br />discharge point be added. The new outfall, U009, is the discharge point from <br />the Middle Pyeatt sedimentation pond No. 3. Discharge is to the Middle Pyeatt <br />Gulch. <br />This pond is being constructed based on a model developed by the University of <br />Kentucky. Instead of being designed to contain the 10-year, 24-hour <br />precipitation event, the pond is designed to meet applicable effluent <br />limitations. Since the pond will discharge only in response to precipitation <br />events, it will be designed to meet settleable solids limitations. The pond <br />will have principal and emergency spillways. The principal spillway shall be <br />outfall 009. Authorization to discharge via the emergency spillway is implied <br />as it discharges from the same physical location. Monitoring should be <br />performed at the principal spillway. <br />Effluent limitations and monitoring requirements for outfall 009 will be the <br />same as those already in effect for the existing outfalls, as shown in Parts <br />I.A.1. and I.B. 1. of the permit. Pages la and ld of the permit are being <br />amended and page lh is being added as a result of this amendment. <br />Jon C. Kubic <br />August 12, 1986 <br /> <br /> <br />