Laserfiche WebLink
channels as necessary to allow passage and to minimize disturbance of the hydrologic balance. Access <br />roads will utilize culverts designed to safely pass the 10-year, 24-hour precipitation event (see Tables 13-5 <br />and 13-6). Ditches and drainage wntrol will be established during construction and maintenance of the <br />roads to minimize erosion and to assist traffic passage. <br />Design and Construction. The design of the access roads incorporate the demand for mobility and travel <br />efficiency, based on the geometric criteria appropriate for the anticipated volume of traffic, weight and speed <br />of the vehicles to be utilized. The design and construction or reconstruction of access roads not within the <br />mine pit area will be certified by a registered professional engineer, except as provided for in Rule <br />4.03.2(1)(f)(ii). <br />Access roads will be designed and constructed or reconstructed in compliance with the following standards <br />in order to control erosion and disturbance of the hydrologic balance. Topsoil will be removed and <br />stockpiled in accordance with the topsoil salvage plan. <br />The vertical alignment of the access roads will not exceed 10 percent on the overall grade. Maximum pitch <br />gratle will nol exceed 15 percent, and there will not be more than 300 feet of pitch grade exceeding 10 <br />percent within any consecutive 1,000 feet. <br />The horizontal alignment will be consistent with the existing and postmining topography and will be <br />coordinated with the vertical alignment to ensure that the roads will not cause excessive environmental <br />damage. <br />Road cut slopes will not be steeper than 1.5H:1V in unconsolidated material or 0.25H:1V in rock. <br />Embankment fill slopes will not be steeper than 1v:2h, except where embankment material is a minimum 85 <br />percent rock. Embankment slopes will not be steeper than 1.35H:1 V unless it has been tlemonstrated to the <br />regulatory authority that embankment stability will result. The minimum safety factor for all embankments <br />will be 1.25. <br />All vegetation material and topsoil, as determined under Rule 4.06.2, will be removed from beneath the <br />design roadbed, shoulders, and surfaces where associated structures will be placed, and will be stored in <br />accordance with Rule 4.06.3. <br />Embankments will not be constructed on side slopes steeper than 3H:1V or 33 percent unless the existing <br />ground is plowed, stepped or if in bedrock, keyed in a manner which increases the stability of the fill. <br />Material used for embankments will be reasonably free of organic material, coal or coal blossom, frozen <br />materials, wet or peat material, natural soils containing organic matter or any other material considered <br />unsuitable for use in embankment construction by the Division. Excess or unsuitable material from <br />excavations will be disposed in accordance with Rule 4.09.1. <br />Material for construction of embankments will come from the vicinity of the mining area and will be non-toxic <br />and of a non-acid producing nature. <br />PR-05 31 Revised 01/06 <br />