1993-11-15_GENERAL DOCUMENTS - C1981017

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N 5TATE OF COLORADO Roy Romer, Governor 1876 ` DEPARTMENT OF NATURAL RESOURCES MINED LAND RECLAMATION DIVISION\� FRED R. SANTA, Director DATE: December 13, 1988 TO: Mike Long FROM: Candy Thompson L RE: Refuse Disposal Area Diversion Design and Underground Waste The following mines have been partially or wholl a 24-hour diversion design around refuse areas. y pproved with 10-year, C-80-007 - Mt. Gunnison The diversions for both the upper and lower waste ile the 10-year event. Redesign is required to adequatelys h been designed for pass the 100-year event. The operator should be contacted and requested to revise these designs and implement any changes needed on the ground for the active area. C-81 -044 - Eaale 5 & 9 Mines The ditch around the refuse disposal area is sufficient in size to carry the 100-year event. There are 2 designs for the ditch in the which conflict. A memo has been written to Gregg uire Permit application amendments are needed to the permit applicationsg q - detailing what C-84-053 - Eastside Coal The proposed refuse area has been designed for a 10-year, 24-hour event. The Pile is not constructed. The operator has been notified of the need to modify the design. l/C-84-017 - Coal Basin Mines Most of the added ditch for the Rock Tunnel and Sutey designed for a 10-year, 24-hour event. The operator has been useA no tified be the n need to change these designs and the ground ditch sizing as needed. igned for the 100-year event. Diversions are des C-81 -032 - Meeker Area Mines The diversion ditches from the refuse pile to the sediment pond have been designed for a 10-year event. The on-t Pass the 100-year event howe he-ground sizing appears adequate to revising. ver the design in the permit application needs 215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (3C3)