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c;Lt,.,..~~ ;:Dads: i,l~; 1: uraiua~e (cont.) <br />needs and for utilities. Sediment control will <br />comply with sections 816.42 and 816.45. Existing <br />Class I roads and proposed Class I roads will be <br />grade3 (or regraded) to drain from the middle crown <br />to ditches that will drain to sedimentation ponds <br />via culverts. (Fig. 3?, 38, 39, 40, 41, and 42) <br />The 10-year, 24-hour precipitation event is described <br />in section 816.46(c). Using this design event, <br />Energy Fuels has calculated the peak runoffs for <br />the different culverts and ditches and selected size <br />and geometry accordingly. Peak flow rates through <br />culverts are shown on Energy Mines No. 1 and 2 Roads <br />(Map 35) and Eckman Park Roads (t•fap 36). The method <br />used for calculating peak flows through culverts is <br />shown in Table 115, Typical Road Culvert Hydraulic <br />Calculation. (v3, pp. 816-194-195) <br />The Applicant will comply. <br />b) Ditches. Ditches and road drainage have been <br />designed in accordance with the standards in .30 <br />CFR 816.153(a)(1). (v3, pp. 816-192-195) <br />The Applicant will comply. <br />c) Culverts and bridges. No bridges will be constructed <br />within the permit area. Culvert sizes were selected <br />using charts in "Design of Surface Mining Haulage <br />Roads - A Manual" - Bureau of Mines Information <br />Circular 8758. <br />Inlets and outlets will be riprapped and are <br />designed to avoid plugging and collapse. To the <br />extent trash and debris do accumulate., it will be . <br />removed. No special racks or basins will be built. <br />The loads of Energy Fuels' coal haulage fleet require <br />all culverts to be covered by at least 3 feet of com- <br />pacted fill. The cover for each size culvert has <br />been calculated on the basis of maximum wheel loading <br />and soil properties. <br />Culverts for road surface runoff are provided where <br />the roadway provides a barrier to natural drainage. <br />All have been designed to carry the peak runoff from <br />the 10-year, 24-hour precipitation event. Rock <br />headwalls will be placed to protect the inlets from <br />erosion. Water flowing from the culvert will be dis- <br />charged either below the toe of the fill or to rip- <br />rapped channels and will not be discharged directly <br />on any fill material. (v3,pp. 816-148,199) <br />The Applicant will comply. <br />