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<br />COLORADO DEPARTMEN"f OF HEALTH <br />Water Qualir.y Control Division <br />4210 Bast 1Lth Avenue <br />Denver, Colorado 80220 <br />RATIONALE <br />AMENDMENT tlf2 <br />TRAPPER MINING, INC. <br />PERMIT NUMBER CO-0032115 <br />MOFFAT COUNTY <br />By letter of June 23, 1986, the perinittee has requested that an additional <br />discharge point he added. The new outfaLl, /k009, is the discharge point from <br />the Middle Pyeatt sedimentation pond No. 3. Uischarge is to the Middle Pyeatt <br />Gulch. <br />This pond is being constructed based on a model developed by the University of <br />Kentucky. [nstead 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 he designed to meet settleable solids Limitations. The pond <br />will have a siphon-tube discharge sCructure which will allow gravity discharge <br />down to the sediment storage Level, thus pumping down the pond should not be <br />necessary. <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 [. 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, 19B6 <br />