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COLORADO <br />Division of Reclamation, <br />AV Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />October 10, 2017 <br />Interofce Memo <br />New Horizon Mine (Permit No. C-1981-008) <br />Technical Revision No. 81 (TR -81) <br />I have reviewed New Horizon Mine's (NH) PAP and proposed changes regarding the addition of <br />the Lincoln Street haul road submitted to ensure the following Rules have been satisfied as part <br />of the TR -81 review process. <br />Rule 4.03.1(1)45) <br />Rules 4.03.1(1)-(5) deal with the performance requirements for haul roads. <br />(1) General Requirements — All general requirements for haul roads are discussed starting on <br />page 30 for the addition of Lincoln Street Haul Road of Section 2.05.3(3) in NHN's TR - <br />81. Description and designs provided for each haul road satisfy the requirements of this <br />section. <br />(2) Location — Haul roads have been designed and placed in areas that are of most stability. <br />Discussions regarding sediment control and minimization of sedimentation and flood <br />have been addressed with the proposed attachment 2.05.3(3)-1. <br />(3) Design and Construction — Vertical alignment requirements have been met. Haul road <br />grades for each section has been included on Map 2.05.3(3)-8. There is no section of haul <br />road that exceeds 10% grade and no issues regarding horizontal alignment. Width of haul <br />roads is shown on Map 2.05.3(3)-8. Typical design cross-sections are included on Map <br />2.05.3(3)-8. Haul roads are designed to allow for anticipated traffic. Road cut designs are <br />included in Map 2.05.3(3)-8 under the "Typical Views" of the map. Road cuts are <br />designed with a range of 1.5h:ly to 10h:ly which is more conservative than that which is <br />required under this Rule. <br />(4) Drainage — Drainage for haul roads are discussed under the attachment 2.05.3(3)-1. <br />Additional SEDCAD demonstrations for Culver C-176 are found in associated <br />attachment 2.05.3(3)-28. <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us I *','n •% <br />John W. Hickenboper, Governor I Robert W. Randall, Executive Director I Virginia Brannon, Director . �g76 f, <br />