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Where the embankment is placed against the existing slopes, the slopes will be benched and <br />• scarified down to a firm dense base as the new fill is being placed. Material so loosened will be <br />mixed with the new fill and the resultant mix blended firmly into the slope. <br />When rock or rocky material is used for embankment, placement shall be in layers not exceeding <br />the maximum size of the rock present, and in no case shall lifts exceed 36 inches in depth. Rock <br />shall be placed in a manner that will ensure proper placement in the embankment, so that voids, <br />pockets, and bridging will be reduced to a minimum. <br />Temporary erosion control measures shall be implemented during embankment construction to <br />control sedimentation and minimize erosion until permanent control measures can be established. <br />After construction is complete the area disturbed will be seeded and mulched to reduce the rate <br />and volume of run -off. <br />Access Road Drainage <br />The Bates Portal access road is designed, and shall be maintained to have adequate drainage, <br />using ditches and culverts. The water control system is designed to safely pass peak runoff from <br />a 10 -year, 24 -hour precipitation event. The drainage design for the Bates Portal access road is <br />shown on Map 13A. <br />Access Road Surfacing <br />Access roads will be plated with 6 to 12 inches gravel. This will be adequate for the traffic, <br />weight and speed of the vehicles to be used. Acid or toxic forming substances will not be used <br />in road surfacing. <br />Access Road Maintenance <br />Road surfaces will be patched as necessary and potholes will be filled. Gravel road surfaces will <br />be periodically watered and maintained with a motor grader. Ditches along the roadways will be <br />periodically cleaned with a motor grader and the road shoulders will be smoothed to conform to <br />the road surface. If an access road is damaged by a catastrophic event such as a flood or <br />earthquake, it will be repaired as soon as practicable after the damage has occurred. Gravel will <br />be added to the road surfaces as necessary. <br />Access Road Reclamation <br />The Bates Portal access road will be reclaimed in conjunction with the reclamation and <br />backfilling of the Bates Portal. <br />Light Use Road Location <br />Light -use roads shall be located on ridges or on the most stable available slopes to minimize <br />erosion. <br />Light Use Road Design and Construction <br />The Bates Portal light use road runs from the access road and parallels the conveyor corridor a <br />distance of about 230 feet with a constant grade of 10 percent. <br />• <br />TR -55 2.05 -7b 03/11 <br />