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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 />April 9, 2018 <br /> <br />Interoffice Memo <br />Trapper Mine (Permit No. C-1981 -010 ) <br />Technical Revision No. 119 (TR-119) <br /> <br />Robin, <br /> <br />I have reviewed Trapper Mine ’s (Trapper) TR-119 provided Haul Road related material and design <br />criteria and have the following comments: <br /> <br />Rule 4.03.1(1)-(5) <br /> <br />Rules 4.03.1(1)-(5) deal with the performance requirements for haul roads. <br /> <br />(1) General Requirements – All general requirements for haul roads are discussed starting on <br />page 3-160 of Section 3.7.2 in Trapper’s PAP. Description and designs provided for each <br />haul road satisfy the requirements of this section. <br />(2) Location – The 2018 haul road ha s been designed and placed in an area that is of most <br />stability along the ridge of the current topography. Additional discussions regarding <br />sediment control and minimization of sedimentation and flood have also been addressed. <br />(3) Design and Construction – Vertical alignment requirements have been met. Discussions <br />regarding haul road grades are found on page 3-161 under Section 3.7.2.2. There are no <br />sections of the proposed 2018 haul road that exceeds 10% grade and no issues regarding <br />horizontal alignment. . Haul roads are designed to allow for anticipated traffic. Typical <br />design cross-sections which show the width of haul roads for both one-way and dual <br />traffic are shown on Figures 3.7-1 and 3.7-2. Road cut designs are also included on <br />Figures 3.7-1 and 3.7-2. Road cuts are designed to be no steeper than a 2h:1v which is <br />more conservative than that which is required under this Rule. <br />(4) Drainage – Drainage for haul roads are discussed under Section 3.7.2.3 of Trapper’s PAP <br />starting on page 3-166. Supporting demonstrations for as built ditches, culverts and