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• Should haul roads not within the estimated mining disturbance areas be necessary, they will be <br />designed and constructed or reconstructed in compliance with the following standards in order <br />to control erosion and disturbance of the hydrologic balance. <br />The vertical alignment of the haul roads will not exceed 10 percent on the overall grade. <br />Maximum pitch grade will not exceed 15 percent, and there will not be more than 300 feet of <br />pitch grade exceeding 10 percent within any consecutive 1,000 feet. <br />The horizontal alignment will be consistent with the existing and postmining topography and will <br />be coordinated with the vertical alignment to ensure that the roads will not cause excessive <br />environmental damage. <br />Road cut slopes will not be steeper than 1v:1.5h in unconsolidated material or 1v:0.25h in rock. <br />Embankment fill slopes will not be steeper than 1v:1.5h, except where embankment material is <br />a minimum 85 percent rock. Embankment slopes will not be steeper than 1v:1.35h unless it <br />has been demonstrated to the regulatory authority that embankment stability will result. The <br />minimum safety factor for all embankments will be 1.25. <br />All vegetation material and topsoil, as determined under 4.06.2, will be removed from beneath <br />• the design roadbed, shoulders, and surfaces where associated structures will be placed, and <br />will be stored in accordance with 4.06.3. <br />Embankments will not be constructed on side slopes steeper than 1v:5h or 20 percent unless <br />the existing ground is plowed, stepped or if in bedrock, keyed iri a manner which increases the <br />stability of the fill. <br />Material used for embankments will be reasonably free of organic material, coal or coal <br />blossom, frozen materials, wet or peat material, natural soils containing organic matter or any <br />other material considered unsuitable for use in embankment construction by CDMG. Excess or <br />unsuitable material from excavations will be disposed in accordance with 4.09.1. <br />Material for construction of embankments will come from the vicinity of the mining area and will <br />be non-toxic and of a non-acid producing nature. <br />Material containing, by volume, less than 25 percent of rock larger than 6 inches in greatest <br />dimension will be spread by scrapers or dozers in successive uniform layers not exceeding 12 <br />inches in thickness before compaction. <br />• <br />(REVISED 12100) 2.05.3(3) -13 <br />