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. `OF ~O~O <br />N~~ X90 <br />Q DEPARTMENT OF NATURAL RESOURCES <br />~ ~ /~~ r~ y Davitl H. Gelches, Executive Director <br />'~'~`~~,^-/~'' ` MINED LAND RECLAMATION DIVISION <br />'~ /876 * DAVID G. SNELTO N, Director <br />R~chartl D. Lamm _ <br />Governor <br />April 17, 1986 <br />Mr. Dennis Conn <br />West Elk Coal Co. <br />P.O. Box 591 <br />Somerset, Colorado 81434 <br />Re: Mt. Gunnison No. 1 mine permit renewal, File No. C-80-007 <br />Dear Mr. Conn: <br />iii iiiiiiiiiiiiiiii <br />999 <br />Following are a few additional adequacy comments concerning your permit <br />renewal application. Please include these with the ones sent earlier. <br />Predict a worst case scenario for the Minnesota Creek drainage basin. <br />Assume subsidence occurs, inflows move toward the North Fork, and <br />Minnesota Creek dries up completely. What will be the quality of water <br />that moves laterally toward the North Fork when it reaches WECC's <br />treatment facilities? Is it anticipated that water quality standards <br />will be exceeded? Will additional treatment facilities be needed? <br />2. Page 2-541. Quantify the impact life of mine operations in the F seam <br />will have on stream water quality. What will be the extent and nature <br />of subsidence and fractions that may occur and how long will these <br />effects last? What affect(s) will they have on surface erosion, <br />sediment yields, and ephemeral drainages? <br />3. Page 2-541. The flow of springs in the F seam or within 100 feet above <br />the coal subcrop could increase, decreased, or cease in response to <br />mining in the vicinity. Provide a map showing locations where this <br />might occur. Also, justify why springs in excess of 100 feet above the <br />coal subcrop will not be affected by mining. <br />4. Page 2-548. Provide a map showing the locations of decreed water <br />rights in the Minnesota Creek Basin, the Deer Creek Domestic Springs <br />and Pipeline, and the Deep Creek Ditch from the F-Seam outcrop. <br />Justify why the impairment potential for these water rights is low. <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />