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® MONTGOMERY WATSON <br />Mining Group <br />December 23, 1998 n~(~F~uE~ <br />DEC ? ~ 1998 <br />Ms. Sandra L. Brown <br />Colorado Division of Minerals & Geology'a~~'~ "' m'nefd~S ~' Geology <br />1313 Sherman Stree[ -Room 215 <br />Denver, Colorado 80203 <br />(303) 866-3567 <br />iii iiiiiiiiiiiu iii <br />sss <br />Re: Kerr Coal Company - Marr Mine (Permit No. C-80-006), Technical Revision TR- <br />18, Responses to DMG Technical Adequacy Comments on Modifications to Tipple <br />Reclamation Plans <br />Dear Ms. Brown: <br />In response to your review comments on Kerr Coal Company's (Kerr) Technical Revision <br />Application (TR-18) for modification of the Tipple reclamation plans, we present the <br />following responses and the accompanying associated revised permit materials. The <br />responses are provided in a comment/response Format to facilitate your review and any <br />revised permit materials are referenced, as appropriate, in [he corresponding response(s). <br />1J 712e volume of steel demolition delnis is estimated to be 500 yd'. How was this estimate <br />calculated and what steel debris will be buried? !s Kerr planning to sell any equipment to scrap <br />dealers? <br />Response: When Kerr was ini[ially exploring options for modification of tipple reclamation <br />plans to address the loss of potential disposal sites, Kerr provided Jim Burnell with an <br />informal memo (J. Nettleton to J. Burnell, 7/23/97) outlining a preliminary proposal for his <br />review and input. The figure for estimated volume of steel demolition debris is based on the <br />following calculations, included in the 7/97 memo, and reFlects significant conservatism: <br />• Shop Utility Building - 45,240 h' (to be retained for planned postmining land <br />use, see response to Comment 8) <br />• Crusher/Breaker - 52,500 ft' (will probably be sold for salvage) <br />• Baghouse - 7,500 ft' <br />• Tool Shack - 3,960 k' <br />• Switchhouse - 2,000 fr' <br />• Train Loadout - 18,000 ft~ <br />• Conveyors - 8,125 fr` (will probably be sold for salvage) <br />• Fueling Station - 2,000 ft` <br />• Culverts - 620 ft' <br />P.G. Box 774018 Te I :970 879 6260 <br />1475 Pine Grove Road Fax: 9708199048 Serving the World's Environmental Needs <br />Steamboat Springs, Colorado <br />60477 <br />