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COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Interoffice Memorandum <br />May 5, 2016 <br />From: Leigh Simmons <br />To: Rob Zuber <br />Subject: Colowyo Mine (Permit No. C-1981-019) <br />PR -4, groundwater review. <br />Review of response to third adequacy review. <br />Colowyo Coal Company (CCC) responded to the initial adequacy review of the PR -4 application <br />with letters dated November 20, 2015; December 17, 2015; and January 27, 2016.1 reviewed <br />this material and generated a memo on March 10, 2016, which was used in a second adequacy <br />review letter. <br />CCC responded to the second review with a letter dated March 31, 2016, which I reviewed and <br />commented on in a memo dated April 20, 2016. The memo was used to generate a third <br />adequacy review letter, which was addressed by CCC in a letter dated April 26, 2016. <br />This final review memo retains old comments where necessary for clarity. New comments are <br />written in bold. <br />Preamble <br />CCC have satisfactorily addressed all adequacy items. Four items are addressed with <br />stipulations (items 80, c; 81, a; 81, b; and 86). <br />Rule 2.04.5 — General Description of Hydrology and Geology <br />64. The response is sufficient. <br />Rule 2.04.6 — Geology Description <br />65. The response is sufficient. <br />66. The response is sufficient. <br />67. The response is sufficient. <br />68. The response is sufficient. <br />69. The response is sufficient. <br />70. The response is sufficient. <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />John W. Hickenlooper, Governor I Mike King, Executive Director I Virginia Brannon, Director <br />