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~.~ >.::_ 999.'""SEC COLORADO.., Q DIVISION OF MINERALS AND GEOLOGY pepartmenl of Natural Rewurces 1313 Sherman St., Room 215 Denver, Colorado 80203 Phone: (303) 866-3567 FA%: (3031 832-8106 February 17, 2000 Tim Stover J.E. Stover and Associates 2768 Compass Drive, Suite 101 Grand Junction, Colorado 81506 RE: Roadside Miae North and South Portals Miae, Permit C-81-041 South Portal Water Handbag Dear Mr. Stover: We have reviewed your submittal of January 31, 2000. The proposal includes a plan to install a 4" dewatering pipe through the proposed South Portal seals. The submittal includes a sketch and data to support the argument that the existing siphon, in combination with the proposed 4" pipe, would be an appropriate system for permanent minewa[er discharge. We have a number of questions regarding the adequacy of the proposed plan with respect to permanent minewaler discharge, which may require some time to resolve. However, with some clari5catioq the existing siphon and proposed pipe system would appear to be acceptable for the interim period during reclamation operations, while mine personnel are on site on a daily basis. Upon resolution of questions pertinent to the interim discharge system, the proposed sealing plan could be approved. Our specific comments on the preliminary proposal are set forth below, with issues pertinen! to the interim period presented separately from our concerns regarding permanent discharge. We believe that the interim plan can be handled as a minor revision. The plan for permanent discharge will need to be submitted as a technical revision Interim issues DIVISION O F MINERALS cEOLOCY RECLAMATION MINING•SAFETY sill ovens Governor Greg E. Walther Executive Director Michael e. Long Division Director 1. Appropriate sections of the permit will need to be amended to specifically address the interim dewatering plan for the South Portals Mine, addrossing both the 4" pipe to be installed in the South Portal seal and the existing siphon system. Nanative on pages 14-29, 14-30, 17.6, and 18- 2, and the Fgure 14-2 sketch will need to be amended to specifically describe the interim plan, including any monitoring, flow adjustments, or other maintenance associated with Ute system. Narrative will need to include a commitment to submittal of a plan for permanent minewater discharge by June 30, 21X10. 2. Anew map exhibit will need [o be provided, with the interim dewatering system overlain on the mine workings Appropriate maps or diagrams should be provided to clearly depict discharge points, mine water accumulation areas, and elevational and spatial relationships pertinem to the discharge pipes and siphon system. 3. The interim plan will need to address the ability to treat discharge from the South Portals pipe or the siphon if water quality deteriorates in the future, such that CDPS effluent limits cannot be met without hea[menl STATE OF