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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />25 February 2011 <br />Mr. Tony Tennyson <br />Colowyo Coal Company, LP <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />Re: Colowyo Mine C-1981-019 <br />Third Adequacy Letter - Technical Revision 81 <br />Dear Mr. Tennyson: <br />COLORADO <br />D IV IS I ON OF <br />RECLAMATION <br />MINING <br />SAFETY <br />John W. Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />Loretta E. Pineda <br />Director <br />The Colorado Division of Reclamation, Mining and Safety (Division) has received the Colowyo <br />Coal Company, LP's (Colowyo) responses to the Division's 16 July 2010 Second Adequacy <br />Letter for Technical Revision 81 - South Taylor Fill and PMT Changes. The responses were <br />received in two parts on 15 December 2010 and 6 January 2011. The Division has reviewed <br />Colowyo's responses and has the following comments and adequacy questions. <br />Rule 2.05.3(6) - Overburden <br />1. Response Accepted- Colowyo 1 June 2010 Responses. <br />2. Response Accepted. Colowyo is not changing the swell factor of the South Taylor <br />overburden from 20% to 15%. <br />3. Response Accepted. Colowyo has removed Table 2.05.2-2. <br />Rule 2.10 - Maps <br />4. Response Accepted - Colowyo 1 June 2010 Responses. <br />5. Response Accepted. Colowyo addressed the Divisions questions a and b on Map 19B <br />with their 1 June 2010 responses. <br />6. Response Accepted. Colowyo addressed the Divisions questions a and b on Map 23A <br />with their 1 June 2010 responses. <br />Office of <br />Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines