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,~ ~ - - <br />W~p ~ NT... F TNPZT <br />C , United States Department of the Interior <br />~^ 5 <br />~ a <br />OFFICE OF SURFACE MINING <br />M~RCN ~ ~sv Reclamation and Enforcement <br />Brooks Towers <br />1020 15th Street <br />Denver, Colorado 80202 <br />March 16, 1992 <br />Mr. Steve Renner <br />Colorado Mined Land Reclamation Division <br />215 Centennial Bldg, 1313 Sherman Street <br />Denver, Colorado 80203 <br />Re: Colowyo Coal Company <br />Permit Renewal/Permit Revision Application <br />Permit No. C-81-019 and Excess Spoil Fills <br />Dear Mr. Renner: <br />TA1~~ ~ <br />PRAEN~ <br />•~ ~ <br />~ ^ <br /> <br />We have reviewed the modified information submitted by Colowyo <br />Coal Company on December 19, 1991 as follow-up to the <br />Colowyo/NERD/OSM meeting held on November 19, 1991. The modified <br />information does not fully address the concerns discussed at the <br />November 19th meeting, and the following information should be <br />submitted prior to permit revision approval. Please request this <br />information from the applicant. <br />1. The narrative should be expanded to explain how the <br />horizontal lifts would be constructed, including the <br />method for placing material, the equipment to be used, <br />lift thicknesses, and how the construction method meets <br />MLRD's horizontal lift requirement. <br />2. The construction plan should be expanded to include the <br />methodology for preventing void formation and for <br />achieving densities to ensure mass stability. The <br />construction plan should also include construction <br />drawings, a detailed narrative of the fill <br />construction, and a construction schedule for <br />appurtenances. <br />If you have any questions, please call Roger Baker at (303) 644- <br />2939 or me at 844-2546. <br />Sincerely, <br />~ ~ `~ <br />Ranvir Singh, Chief <br />Federal Lands Branch <br />