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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 />June 16, 2014, 2014 <br />From: Leigh Simmons ' <br />To: Jared Ebert <br />Subject: Williams Fork Mine (Permit No. C- 1981 -044) <br />TR -36, groundwater review <br />You requested that I review the material pertaining to groundwater within the TR -36 <br />application. <br />In the preparation of this memo I also reviewed: <br />• The existing permit application packet (PAP) <br />• Annual Hydrology Reports (AHRs) for the Williams Fork mine <br />I have the following general comments regarding PR -14: <br />The additional text that has been proposed to be added is curiously worded, and the reasons for adding <br />it are not immediately apparent. <br />The proposed text is in three paragraphs, the first of which simply describes the relative elevation of the <br />5A portals. <br />The second paragraph describes the potentiometric (piezometric) surfaces within the Middle Sandstone <br />and the Twentymile Sandstone and the location of these units within the generalized stratigraphic <br />column. <br />The third paragraph makes two statements: <br />i. That water filling the mine cavity is unlikely to affect water levels or water quality within either <br />of the sandstone units; <br />ii. That the mine cavity is unlikely to fill with water to the point where it would discharge from the <br />portal. <br />Based on my brief review of the documents in the laserfiche database, I would broadly agree with each <br />of these statements. <br />Finally, I would note that there is little quantitative specificity in the predictions, and that the revision <br />does not seek to change the water monitoring plan. <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 />Colo <br />'f 1876 �` <br />