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c~RUs Yampa Vall®y III IIIIIIIIIIIIIIII Cyprus Yampa Valley Coal Corporation 29587 Routt County Road #27 Oak Creek, Colorado 80467 303-879-3800 September 16, 1993 RECEI`JED SEP 17 1993 Kent Gorham Reclamation Specialist Division of Minerals and Geology Ciws~.on ui .<~~~~c~a~~ a u,,,,..~gy 1313 Sherman Street, Room 215 Denver, CO 80203 Re: Request for Minor Revision 93-94. Materials Handling. Storage. and Disposal Areas; Permit C-82-056, Twentvmile Coal Comoanv Dear Mr. Gorham: Per our previous conversation, TCC is requesting the above-referenced minor revision in order to clarify the primary materials handling and storage areas, along with permitting of a solidified waste material disposal area. Per our conversation, TCC has revised page 2.05-1 1(g) to clarify the verbage concerning materials storage areas, and has revised enclosed Map 24 (Surface Facilities and Freshwater Systems) to reflect the location of these areas. In addition to the clarification items, TCC has added page 2.05- 1 1(hl to reflect the addition of a solidified waste material disposal area near the low-quality coal pile. As discussed, materials to be disposed of in this area would be comprised primarily of hydrocarbon contaminated materials (such as floor-dri) which are non-hazardous in nature and are solidified by mixing with cement. This solidified material would then be buried in the old spoils on the east end of the storage pad above the dry storage building. The location of the proposed disposal area is shown on revised Map 24. As discussed, this area lies below the approved post-mining topography las shown on the enclosed location diagram which is based upon a section from permit Map 31 - Postmining Topography, and the associated surveyed cross section which has been included for your reference), and would not be subject to re-disturbance during final reclamation activities. The surveyed section indicates the pad surface to lie at an elevation of 6872 - 6880 feet at the high point, with the disposal zone being located some 5 - 10 feet below the current pad surface. As shown on the enclosed location diagram, the post-mining topography for this area is approximately 6900 feet. Also, this pad area is located above the maximum water levels associated with the old pit workings, and as such the buried materials should not be subject to immersion in groundwater. It is anticipated that material disposal would proceed from east to west along the pad. Disposal points will be excavated by means of a backhoe and the excavated spoil material will be utilized to cover the solidified material being disposed of. Excess spoil material excavated from the pad would either be stockpiled for future use, or would be respread and levelled on previously utilized portions of the disposal area.