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• Drainane. Each haul road not within areas disturbed by mining and reclamation activities will <br />be designed, constructed and maintained to have adequate drainage using ditches and culverts <br />to safely convey the peak runoff from a 10-year, 24-hour precipitation event while maintaining a <br />minimum of one half foot of freeboard to the top of the road embankment (see Map 2.05.3-2 for <br />typical details of drainage structures). <br />Drainage ditches will be placed at the toe of all cut slopes formed by the construction of haul <br />roads. Water will be intercepted before reaching a large fill and drained safely away in <br />accordance with the requirements of 4,03.1. Water from a fill will be released below the fill <br />through conduits or in adequately lined channels and will not be discharged onto the fill. <br />When drainage ditches discharge onto open terrain, a number of measures will be taken to <br />protect the terrain from erosion. When the drainage discharges onto a disturbed area, the area <br />will be revegetated to control runoff. In an area where revegetation would not be sufficient to <br />control erosion, the area will be rip-rapped. Temporary measures to reduce erosion will be <br />employed while the area is undergoing revegetation such as straw dikes, containment ditches, <br />etc. WFC typically constructs ditches on the inside of roadway cuts and safety berms for <br />drainage. As most road cuts are into resistant bedrock-type material, ditches normally do not <br />require lining. Culvert designs are presented in the previous section. <br />If the ditch is not stable, then WFC will use a larger ditch section and/or adequately line the <br />ditch in order to comply with applicable regulations. <br />Maintenance Same as for original haul roads. See Section 2.05.3. <br />Restoration Same as for original haul roads. See Section 2.05.3 <br />Access Roads and Light Use Roads in Amendment Area No major access roads will be <br />used for the amendment area although minor access to sediment ponds and other facilities <br />may be used at various times. These roads will follow the same design and installation <br />procedures as outlined in Section 2.05.3 for the original mine permit area. <br />Suaport Facilities- Buildings No new buildings are planned within the amendment area. <br />Coal Handling Structures No new coal handling structures are planned within the amendment <br />area. <br /> <br />(REVISED 12/00) Attachment 2.05.3(3) -10-122 <br />