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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 />COLORADO <br />D I V I S I ON OF <br />RECLAMATION <br />MINING <br />SAFETY <br />Bill Ritter, Jr. <br />Governor <br />Harris D. Sherman <br />Executive Director <br />September 28, 2009 <br />Mr. Jerry Nettleton <br />Environmental Supervisor <br />Twentymile Coal Company <br />29515 Routt County Road 27 <br />Oak Creek, CO 80467 <br />Re: Foidel Creek Mine, Permit No. C1982-056, PR8 Adequacy Comments No. 2 <br />Dear Mr. Nettleton: <br />Ronald W. Cattany <br />Division Director <br />Natural Resource Trustee <br />The Division has reviewed the operator's responses to the Division's preliminary adequacy review letter of <br />July 28, 2009. Twentymile Coal Company's (TCC) responses were received on September 18, 2009. TCC's <br />responses resolved all of the Division's previous comments (1 through 5). However, the Division has several <br />additional comments as a result of TCC's responses. The new comments will continue the original <br />numbering starting with No. 6. <br />6. Please add to the permit application a prediction of the worst possible consequences of subsidence <br />impacts to the springs that are located around the western perimeter of the Western Mining District <br />(shown on the recently submitted copy of Map 15A). Please include a table that is similar to the <br />partially completed one shown below, and include a description of the method and assumptions used <br />for predicting drawdowns from new Western District Mining in the table. <br />Office of <br />Mined Land Reclamation <br />Denver • Grand Junction • Durango <br />Office of <br />Active and Inactive Mines