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For construction of the Bates Portal light use roads, all vegetation material and topsoil will be <br />removed from the design road bed, shoulders, and surfaces where associated structures will be <br />placed. Topsoil will be placed in one of the topsoil stockpiles located on site. Vegetation shall <br />not be cleared for more than the width necessary to serve traffic and utility needs. Compaction <br />on the embankment shall be required only to the extent necessary to control erosion and maintain <br />the road. <br />About 0.25 miles of temporary light use road will be constructed in the lower reaches of the <br />RDA #1 expansion area in late 2011. The light use roads will be used to access boring and test <br />pit locations. The light use roads will only be wide enough to achieve safe access of the drill rig <br />and backhoe. Topsoil will not be salvaged. The temporary light use roads are not in an area <br />where run -off will flow to a sediment pond. Therefore, silt fences or straw wattles will be used <br />as necessary to prevent erosion and siltation. Portions of the access roads are constructed in the <br />ephemeral channel however, the upstream watershed is less than 0.10 square miles. Field design <br />methods will be used. The main stem of the light use road is about 1,050 feet long and has an <br />average grade of 7 percent. There are no pitch grades exceeding 20 percent longer than 300 feet. <br />The west spur road is about 100 feet long and has a grade of 15 percent. The east spur road is <br />about 110 feet long and has a grade of 18 percent. <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 />Light Use Road Drainage <br />The Bates Portal light use 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 light use road is <br />shown on Map 13a. <br />No surfacing will be utilized for the light use roads. The light use roads will be maintained <br />adequate for the intended use of the roads. A light use road damaged by a catastrophic event will <br />be repaired as soon as is practicable after the damage has occurred. <br />Light Use Road Reclamation <br />The Bates Portal light use road will be reclaimed in conjunction with the reclamation and <br />backfilling of the Bates Portal. <br />The temporary light use road located in the lower reaches of the RDA #1 expansion area will be <br />reclaimed following its use. Test pits will be backfilled and returned to AOC. The area will be <br />seeded and mulched. <br />MR -99 2.05 -7c Revised 10/07/11 <br />