2012-02-03_PERMIT FILE - C1981012A (5)

Home Browse Search

be placed in one of the topsoil stockpiles located on site. Vegetation shall not be cleared for more than the width necessary to serve traffic and utility needs. Compaction on the embankment shall be required only to the extent necessary to control erosion and maintain the road. About 0.25 miles of temporary light use road will be constructed in the lower reaches of the RDA# 1 expansion area in late 2011. The light use roads will be used to access boring and test pit locations. The light use roads will only be wide enough to achieve safe access of the drill rig and backhoe. Topsoil will not be salvaged. The temporary light use roads are not in an area where run -off will flow to a sediment pond. Therefore, silt fences or straw wattles will be used as necessary to prevent erosion and siltation. Portions of the access roads are constructed in the ephemeral channel however, the upstream watershed is less than 0.10 square miles. Field design methods will be used. The main stem of the light use road is about 1,050 feet long and has an average grade of 7 percent. There are no pitch grades exceeding 20 percent longer than 300 feet. The west spur road is about 100 feet long and has a grade of 15 percent. The east spur road is about 110 feet long and has a grade of 18 percent. Temporary erosion control measures shall be implemented during embankment construction to control sedimentation and minimize erosion until permanent control measures can be established. After construction is complete the area disturbed will be seeded and mulched to reduce the rate and volume of run -off. Technical revision number 62 provides for the construction of two light use roads and a maintenance road. One 0.2 mile long light use road provides access to slurry wells S2 and S3 at the west mine. The second 0.1 mile long light use road provides access from the RDA to the cell repeater. The maintenance road will be used to construct the power line to the cell repeater. Minor revision number 105 provides for the construction of two temporary light use roads located at the west mine. They will be used for access to drilling five geotechnical holes. Light Use Road Drainage The Bates Portal light use road is designed, and shall be maintained to have adequate drainage, using ditches and culverts. The water control system is designed to safely pass peak runoff from a 10 -year, 24 -hour precipitation event. The drainage design for the Bates Portal light use road is shown on Map 13a. Drainage design for the 0.2 mile long light use road that provides access to slurry wells S2 and S3 is shown on Map 14. Drainage designs for the RDA light use road and Maintenance road that provide access to the cell repeater are shown on Map 13. No surfacing will be utilized for the light use roads. The light use roads will be maintained adequate for the intended use of the roads. A light use road damaged by a catastrophic event will be repaired as soon as is practicable after the damage has occurred. Light Use Road Reclamation Light use roads will be reclaimed. The Bates Portal light use road will be reclaimed in conjunction with the reclamation and backfilling of the Bates Portal. The temporary light use road located in the lower reaches of the RDA #1 expansion area will be reclaimed following its use. Test pits will be backfilled and returned to AOC. The area will be seeded and mulched. MR -105 2.05 -7c Revised 01/12/12