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• The overall vertical alignment (grade) of the haul roads will not exceed 10 percent. Maximum pitch <br />grade will not exceed 15 percent. However, due to topographic conditions and constraints along the <br />alignments of the proposed haul roads, there will be road segments that will exceed a 10 percent grade <br />for more than 300 feet within any consecutive 1,000 feet. The actual length of these segments will be <br />minimized to the extent possible and are designed to maintain stability and reduce erosion. SCC will <br />provide the Division with a stability analysis for the first 600 hundred feet of Haul Road "D", which <br />meets this criteria. The horizontal alignment will be consistent with the existing and postmining <br />topography and will be coordinated with the vertical alignment to ensure that the roads will not cause <br />excessive 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 1 V:2H, except where embankment material is a <br />minimum 85 percent rock. Embankment slopes will not be steeper than iV:1.35H unless it has been <br />demonstrated to the regulatory authority that embankment stability will result. The minimum safety <br />factor for all embankments will be 1.25. A stability report entitled "Geotechnical Investigation Haul <br />Roads Y-A and Y-B and Sedimentation Pond 010" is located in Attachment 13-5, Geotechnical <br />Investigation Haul Roads Y-A and Y-B, and Pond 010. This report concludes that all road cut and fills <br />• will be stable. Attachment 13-6, Geological Report for Haul Roads A and B, discusses the various road <br />cuts and fills from a geological engineering standpoint. The MWH recommendations (undated <br />memorandum, subject Haul Road D Outslope Stabilization Plan) at Attachment 13.726 are adopted <br />for the design of the haul road above Pond 12. <br />All vegetation material and topsoil, as determined under 4.06.2, will be removed from beneath the <br />design roadbed, shoulders, and surfaces where associated structures will be placed, and will be <br />temporarily stored. After construction, topsoil will be replaced on road side slopes and the area will be <br />revegetated. <br />Embankments will not he constructed on side slopes steeper than 1V:5H or 20 percent unless the <br />existing ground is plowed, stepped or if in bedrock, keyed in a manner which increases the stability of <br />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 4.09.1. <br />Material for construction of embankments will come from the vicinity of the mining area and will be <br />non-toxic and of a non-acid producing nature. <br />IS Revised 6/01 <br />