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18 <br />Light Use Road Design and Construction <br />The Bates Portal light use road runs from the access road and parallels the conveyor <br />corridor a distance of about 230 feet with a constant grade of 10 percent. <br />For construction of the Bates Portal light use roads, all vegetation material and <br />topsoil will be removed from the design roadbed, shoulders, and surfaces where <br />associated structures will be placed. Topsoil will be placed in one of the topsoil <br />stockpiles located on site. Vegetation shall not be cleared for more than the width <br />necessary to serve traffic and utility needs. Compaction on the embankment shall be <br />required only to the extent necessary to control erosion and maintain the road. <br />About 0.25 miles of temporary light use road will be constructed in the lower reaches <br />of the RDA#I expansion area in late 2011. The light use roads will be used to access <br />boring and test pit locations. The light use roads will only be wide enough to achieve <br />safe access of the drill rig and backhoe. Topsoil will not be salvaged. The temporary <br />light use roads are not in an area where run-off will flow to a sediment pond. <br />Therefore, silt fences or straw wattles will be used as necessary to prevent erosion <br />and siltation. Portions of the access roads are constructed in the ephemeral channel. <br />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 <br />and has an average grade of 7 percent. There are no pitch grades exceeding 20 <br />percent longer than 300 feet. The west spur road is about 100 feet long and has a <br />grade of 15 percent. The east spur road is about 110 feet long and has a grade of 18 <br />percent. <br />Temporary erosion control measures shall be implemented during embankment <br />construction to control sedimentation and minimize erosion until permanent control <br />measures can be established. After construction is complete the area disturbed will <br />be seeded and mulched to reduce the rate and volume of run-off. <br />Technical revision number 62 provides for the construction of three light use roads. <br />One 0.2 -mile long light use road provides access to slurry wells S2 and S3 at the west <br />mine. The second 0.1 mile long light use road provides access from the RDA to the <br />cell repeater. The third 0.2 mile long light use road will be used to construct the <br />power line to the cell repeater. <br />Minor revision number 105 provides for the construction of two temporary light use <br />roads located at the west mine. They will be used for access to drilling five <br />geotechnical holes. <br />Light Use Road Drainage <br />The Bates Portal light use road is designed, and shall be maintained to have adequate <br />drainage, using ditches and culverts. The water control system is designed to safely <br />pass peak runoff from a 10 -year, 24- hour precipitation event. The drainage design <br />for the Bates Portal light use road is shown on Map 13a. <br />Section 2.05 RN -6 10/17/2016 <br />