2018-07-02_PERMIT FILE - C2010089A (17)

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haul roads. Appendix 2.05.3(3)-3 contains the as -built for the West Haul Road (Section 0+00 to 10+52). A portion of the West Haul Road is located within 100 feet of the Montrose County road right-of-way. As required by DRMS Regulations, NHN requested Montrose County for a waiver to disturb within 100 feet of the County right-of-way. Montrose County has given such a waiver limiting the disturbance to within 25 feet of rights-of-way as a part of the Special Use Permit. Any roads constructed within the mining blocks shown on Map 2.05.3(3)-3 will be considered in -pit haulage roads and are not required to meet the requirements of Rule 4.03.1. General Requirements: NHN will ensure that construction, maintenance, and postmining conditions of haul roads will control or prevent erosion and siltation, pollution of air or water, and damage to public or private property. The design and construction of haul roads not within the disturbed area in accordance with 4.05.2(4) will be certified by a qualified registered professional engineer. The certification report will be submitted to the Division upon completion of any construction and will indicate that the road has been constructed as designed and in accordance with the approved plan. All haul roads will be removed and the land affected reclaimed in accordance with the requirements of 4.03.1(7) unless retention of the road is approved as part of the approved postmining land use and the landowner requests to the Division in writing, that the road or certain parts thereof are to be left open for further use. Design and Construction: Haul roads not within the disturbed area in accordance with 4.05.2(4) will be designed and constructed in compliance with the following standards in order to control erosion and disturbance of the hydrologic balance. Maximum road grades will be as follows: The overall grade will not be steeper than l Oh: l v (10 percent). Maximum pitch grade will not be steeper than 6.5h:1v (15 percent). There will not be more than 300 feet of pitch grade exceeding 10 percent within any consecutive 1,000 feet, but in no case will there be any pitch grade steeper than 6.5h:ly (15 percent). Haul roads will have a horizontal alignment as consistent with the existing topography as possible and will provide the alignment required to meet the performance standards of 4.03.1. Horizontal and vertical alignment will be coordinated to ensure that the road will not cause environmental damage. Road widths will be appropriate for the anticipated volume of traffic and the nature and speed of vehicles to be used. Cut slopes will not be steeper than 1.5h: Iv in unconsolidated materials or 0.25h: Iv in rock, except that steeper slopes may be specifically authorized by the Division if geotechnical analysis demonstrates that a minimum safety factor of 1.5 can be maintained or if geotechnical analysis demonstrates that a safety factor less than 1.5 will not result in significant environmental harm or harm to the public health and safety. Temporary erosion control measures will be implemented during construction to minimize sedimentation and erosion until permanent control measures can be established. All vegetation material and topsoil will be removed from the embankment foundation during construction to increase stability and no vegetation material or topsoil will be placed beneath or in any haul road embankment. Where an embankment is to be placed on side slopes steeper than Section 2.05.3(3) Page 5 March 2018 (TR -16)