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be placed in one of the topsoil stockpiles located on site. Vegetation shall not be cleared for more than <br />the width necessary to serve traffic and utility needs. Compaction on the embankment shall be required <br />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 of the RDA# 1 <br />expansion area in late 2011. The light use roads will be used to access boring and test pit locations. The <br />light use roads will only be wide enough to achieve safe access of the drill rig and backhoe. Topsoil will <br />not be salvaged. The temporary light use roads are not in an area where run -off will flow to a sediment <br />pond. Therefore, silt fences or straw wattles will be used as necessary to prevent erosion and siltation. <br />Portions of the access roads are constructed in the ephemeral channel however, the upstream watershed is <br />less than 0.10 square miles. Field design methods will be used. The main stem of the light use road is <br />about 1,050 feet long 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 grade of 15 percent. <br />The east spur road is about 110 feet long and has a grade of 18 percent. <br />Temporary erosion control measures shall be implemented during embankment construction to control <br />sedimentation and minimize erosion until permanent control measures can be established. After <br />construction is complete the area disturbed will be seeded and mulched to reduce the rate and volume of <br />run -off. <br />Technical revision number 62 provides for the construction of three light use roads. One 0.2 mile long <br />light use road provides access to slurry wells S2 and S3 at the west mine. The second 0.1 mile long light <br />use road provides access from the RDA to the cell repeater. The third 0.2 mile long light use road will be <br />used to construct the power line to the cell repeater. <br />Minor revision number 105 provides for the construction of two temporary light use roads located at the west <br />mine. They will be used for access to drilling five geotechnical holes. <br />Light Use Road Drainage <br />The Bates Portal light use road is designed, and shall be maintained to have adequate drainage, using <br />ditches and culverts. The water control system is designed to safely pass peak runoff from a 10 -year, 24- <br />hour precipitation event. The drainage design for the Bates Portal light use road is shown on Map 13a. <br />Drainage design for the 0.2 mile long light use road that provides access to slurry wells S2 and S3 is <br />shown on Map 14. Drainage designs for the RDA light use roads that provide access to the cell repeater <br />are shown on Map 13. <br />No surfacing will be utilized for the light use roads. The light use roads will be maintained adequate for <br />the intended use of the roads. A light use road damaged by a catastrophic event will be repaired as soon <br />as is practicable after the damage has occurred. <br />Light Use Road Reclamation <br />Light use roads will be reclaimed. <br />The Bates Portal light use road will be reclaimed in conjunction with the reclamation and backfilling of <br />the Bates Portal. <br />The temporary light use road located in the lower reaches of the RDA #1 expansion area will be reclaimed <br />following its use. Test pits will be backfilled and returned to AOC. The area will be seeded and <br />mulched. <br />TR -62 2.05 -7c Revised 03/12/12 <br />