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<br /> <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 | Robert W. Randall, Executive Director | Virginia Brannon, Director <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br /> <br /> <br />May 11, 2018 <br /> <br />Interoffice Memo <br />Trapper Mine (Permit No. C-1981 -010 ) <br />Permit Revision No. 09 (PR-09 ) <br /> <br />Robin, <br /> <br />I have reviewed Trapper Mine’s (Trapper) PR-09 for adequacy regarding Rules 2.05.3(b)-(d) and <br />have the following comments: <br /> <br />2.05.3(b)-(d) <br /> <br />Rules 2.05.3(b)-(d) deal with the requirements for spoil and associated disposal structures . <br /> <br />(b) Description and maps. A description of the proposed N Pit has been included in Section <br />3.1.4.1 as well as Maps M4. Overburden as well as excess spoil for the N Pit will be <br />regraded into the reclamation west of the pit as well as placed as fill in the L Pit. <br />Associated updated post-mining topography descriptions a nd maps have been included. <br />However, as per the discussion with Trapper and the Division, it was explained that <br />additional excess spoil from the proposed N Pit will be placed within the Utility Was te <br />Disposal Area (ash pit). As per Rule 2.05.3(b), descriptions, including appropriate maps, <br />prepared according to the standard of 2.10, and cross section drawings, of the proposed <br />disposal site and design of the spoil disposal structures according to 4.09. <br /> <br />- A map showing location of the disposal area has been included with Map M47A <br />however no cross section drawings of the area has been provided. Please have <br />Trapper provide cross section drawings for the exc ess spoil that will be placed <br />along the Utility Waste area. <br /> <br />Additionally, Rule 2.05.3(b) requires descriptions of the geotechnical investigation, design, <br />construction, operation, maintenance, and removal, if appropriate, of the site and structures <br />and shall be prepared by a qualified registered professional engineer. <br /> <br />- Please refer to part 2.05.3(c) of this memo for additional comments.