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Yhen road ditches discharge onto open terrain, a number of measures will be taken to <br />• protect the terrain from erosion. Peabody will utilize measures as revegetation, riprap, <br /> straw dikes, and silt fence to protect the terrain from erosion. 4hen the road ditch <br /> discharges onto en area disturbed by toed construction, the terrain will be revegeteted to <br /> control runoff. In an area where revegetetion would not be sufficient to control erosion, <br /> the area will be riprapped. Temporary measures to reduce erosion (straw dikes, <br /> containment ditches, silt fences ,etc) will be employed while the area is undergoing <br /> revegetetion such es strew dikes, containment ditches, etc. <br />Seneca typically constructs ditches on the inside of roadway cuts tar drainage. A typical <br />V-ditch section would be a minimum of two feet deep with side slopes 2:1 ar <br />flatter. As most road cuts ere into resistant bedrock-type materiel, ditches normally do <br />not require lining. Culverts will be designed and installed to minimize the runoff volume <br />conveyed in each ditch. Culverts and ditches will typically be designed using SEDCAD to <br />predict the peak runoff and Manning's equation to determine the peak velocity and flow <br />depth (see Attachment 13-7). <br /> If the ditch is not stable, then a larger ditch section will be used end/or adequately <br /> line the ditch in order to comply with applicable reguleti ans. <br />Orainage from access roads within the areas disturbed by mining and reclamation activities <br />(see Exhibits 13-2 end 13.3) will be constructed to meet the requirements of 4.05.2 and <br />such stress roads will at a minimum be constructed and maintained to minimize erosion of <br />the disturbed area. Erosion control measures to be used singly or in combination include <br />but are not limited to: <br />e. Stabilizing all exposed surface areas to promote a reduction in the rate and <br />volume of runoff; <br />b. Using straw dikes, riprap, check dams, berms, geotextile materials, mulches, <br />vegetation sediment filters, contour furrows or other measures that reduce <br />overland flow velocity, reduce runoff volume, or trap sediment; or <br />c. Such other measures to minimize erosion resultant siltation end disturbance to <br />the prevailing hydrological balance. <br />Surf acin9• See Exhibit 13-9 for typical detail. <br />• Culverts. Each ec teas road will be designed, constructed, and maintained to have adequate <br />27 <br />