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COLORADO <br /> Division of Reclamation, <br /> Mining and Safety <br /> Department of Natural Resourccs <br /> Date: April 3,2020 <br /> To: Janet Binns <br /> CC: Michael Cunningham and Jason Musick <br /> From: Zach Trujillo <br /> RE: King Coal Mine,DRMS File No.C-1981-0035 <br /> King Coal Mine TR-29 Review Memo <br /> Janet, <br /> As requested I have reviewed King Coal Mine's (King)proposed changes under TR-29 in terms of <br /> engineering criteria for the proposed access road and associated performance standards under Rule 4.03.2 <br /> as well as the proposed King III portals. <br /> 4.03.2—Access Roads <br /> 4.03.20)—General Requirements <br /> All information required by this section of the Rule has been provided. Please refer to Sections 2.05.3 of <br /> King's PAP and proposed page Section 2.04.6,page 8. While all general requirements have been met,it <br /> was observed that Section 2.05.3 of King's PAP needs to be updated to include discussions regarding the <br /> new access road. Please have King update the above mentioned section to include discussion of the <br /> new access road to King III portals. <br /> 4.03.2(2) - Location <br /> All information required by this Rule has been provided or is not applicable. Please refer to proposed <br /> maps King II-007A and King II-007M. <br /> 4.03.2(3)—Design and Construction <br /> (e)(viii)—Per this Rule,"Embankment slopes shall not be steeper than 1.5h:Iv,except that if the <br /> embankment material is minimum of 85 percent rock, slopes shall not be steeper than 1.35H:IV if <br /> it has been demonstrated to the Division that embankment stability will result."As shown on <br /> proposed Map King II-007M,upper portions of the access road embankment exceeds the <br /> maximum allowable slope of 1.5h:Iv and 1.35h:IV (85%rock)with a slope 1.33H:IV.As <br /> required by this Rule,please have King provide a demonstration to the Division that <br /> embankment stability will result. <br /> King Coal Mine TR-29 Memo April 3,2020 <br /> OF C�L� <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us * *' <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director <br /> 876 :: <br />