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TRI -STATE GENERATION AND TRANSMISSION ASSOCIATION, INC. <br />HEADQUARTERS: P.O. BOX 33695 DENVER, COLORADO 80233 -0695 303 - 452 -6111 <br />December 31, 2013 <br />Mr. Rob Zuber <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining & Safety <br />Department of Natural Resources REG <br />1313 Sherman Street, Room 215 <br />CO <br />RE: Colowyo Coal Company L.P., Mine Permit C -81 -019, Minor Revision No. 129 <br />(MR -129), Rule 4, Volume 12, Formatting Revision <br />Dear Mr. Zuber: <br />Colowyo Coal Company L.P. (Colowyo) received your adequacy letter, dated November <br />27, 2013 for MR -129. As a result, Colowyo has added the following surface water parameters <br />which are currently monitored, but were not approved previously by the Division or included in <br />the "Quarterly Surface Water Laboratory Parameters" prior: <br />Phosphorus (P) <br />Lead (Pb) <br />Bicarbonate (14CO3) <br />The Division noted that Phosphate needs to be included; however, Colowyo does not <br />monitor for Phosphate, <br />Also included with this adequacy response package are the revised pages and a change of <br />index sheet to ease incorporation into the permit document. <br />If you have any questions or concerns please feel free to contact Chris Gilbreath at (303) <br />254 -3291. <br />BAW:CSG:pvt <br />Enclosure <br />AN EQUAL OPPORTUNITY/AFF/RMATIVE ACTION EMPLOYER <br />A Touchstone Energy'Cooperative Kt)"( <br />Sincerely, <br />Barbara A. Walz <br />Senior Vice President <br />Policy and Compliance/ <br />Chief Compliance Officer <br />CRAIG STATION ESCALANTE STATION NUCLA STATION <br />PO. BOX 1307 P.O. BOX 577 P.O. BOX 698 <br />CRAIG, CO 81626 -1307 PREWITT, NM 87045 NUCLA, CO 81424.0698 <br />970.824 -4411 505- 972 -5200 970.864 -7316 <br />