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iii iiiiii~iiii <br />STATE OF COLC~I~v <br />Roy Romer, Gove <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />FRED R. BANTA, Director <br />DATE: September 29, 1989 <br />T0: Matt Hayes <br />FROM: Jeff Clayton /yu-~~ <br />RE: Mt. Gunnison #1 File, #C-SO-007, Lower Waste Pile Drainage Control <br />Structures <br />The east and lower southwest ditches show flow velocities in excess of 6 fps. <br />Flows of this magnitude require riDrappinq, concreting or other efforts to <br />prevent erosion. The natural armoring is a satisfactory measure. A specific <br />site inspection of this armoring should be done to prove this claim of no <br />further erosion. WECC personnel have promised to take additional measures if <br />erosion occurs. After storm events, inspections should be made to assure <br />compliance, if needed. <br />JMC/yjb <br />0098E <br /> <br />215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866.3567 <br />