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COAL <br />s� COMPANY <br />- E00LE. PRODDCTIOK•i{l o <br />5731 State Highway 13 ♦ Meeker, Colorado 81641 <br />December 13, 2012 <br />Mr. Rob Zuber <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />♦ 970- 824 -1500 <br />RECEIVED <br />DEC 1 '' 2012 <br />Division of Reclamation, <br />Mining and Safety <br />RE: Colowyo Coal Company, Permit No. C -81 -019, TR -95 — revision of <br />hydrologic methods, Second adequacy letter response <br />Dear Mr. Zuber, <br />Colowyo received your letter dated July 2, 2012 and has provided responses to <br />your comments. In order to ensure continuity of the comments and responses, <br />Colowyo has restated without modification; the Division's original comments <br />(bold black text), Colowyo's first round response (italicized black text), the <br />Division's follow up comments (bold black text), and finally Colowyo's response <br />to the Division's follow up comments (italicized red text) for each issue raised. <br />1) DRMS Original Comment: <br />Over the last five years, the Division, Colowyo Coal Company staff, <br />and CCC consultants have put in a great deal of time and effort <br />focused on preventing water quality violations and improving the <br />safety of public users of Highway 13 below Prospect Pond. This effort <br />has included improving modeling accuracy. Colowyo most recently <br />updated the approved curve numbers at the mine through technical <br />revision 73 (TR -73, June 2009). As part of TR -73, Colowyo identified <br />soils on the mine site as C soils and associated CN values were <br />approved. <br />Colowyo's June 25, 2012 Response to Comment 1 above: <br />Colowyo Coal Company is aware of the sensitivity regarding Prospect <br />pond and its proximity to Highway 13. In view of this, CCC is proposing <br />with this response to retain the TR -73 input assumptions for the Prospect <br />basin, specifically the curve numbers assigned in TR -73. A revised Table <br />I is attached which retains the TR -73 Curve Numbers for Prospect but <br />A Western Fuels- Colorado, LLC mining property <br />