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4.03 R~S1D6 <br />9.03.1 Raul Roads. (Gbnt'd.) <br />• (4) (a) (iv) <br />See 4.03.1(4)(b)-(e). <br />(4) (b) (i) <br />'Ihe Orchard Valley Mine haul road is an existing structure. All exposed <br />surface areas within cut and fill slopes were revegetated as described in <br />Section 2.05.4 Reclamation Plan. <br />All exposed surfaces within the cut and fill slopes of the Orchard Valley <br />west Mine haul road will be revegetated as described in Section 2.05.4. <br />The Orchard Valley R-0-M coal stockpile haul road is an existing <br />structure. All exposed surface areas within cut and fill slopes were <br />revegetated as described in Section 2.05.4 Reclamation Plan. <br />(4) (b) (ii) <br />Riprap and vegetative sediment filters are used at selected places. <br />Riprap is placed as rec~~ired at drainage structures. Straw dikes are most <br />wrtnronly used at areas of tertg3orary construction (refer to Straw Dike <br />Specification, Surface Drainage Appendix, Volume 8). All drainage <br />structures either reduce overland flow velocity, reduce runoff volume or <br />trap sediment. <br />• (4) (b) (iii) <br />ODVGC is prepared to employ additional measures if those presently in use <br />do not satisfactorily minimize erosion, resultant siltation, and <br />disturbance to the prevailing hydrologic balance. No additional measures <br />are deemed necessary at this time. <br />(4) (c) <br />The Orchard Valley Mine haul road drainage ditches at the toe of cut <br />slopes and cross drain culverts have been constructed at selected <br />intervals. All cross drain culverts at switchbacks or fills discharge <br />water below the fills. No water is discharged onto the fills. <br />Drainage ditches and cross drain culverts used in the Orchard Valley West <br />Mine haul road dischan7e water below fills. <br />The Orchard Valley R-o-M coal stockpile haul road drainage ditches at the <br />toe of cut slopes and cross drain culverts have been constructed at <br />selected intervals. No water is discharged onto the fills. <br />(4) (d) <br />The orchard Valley Mine haul road has been asphalt paved to maximize usage <br />based on traffic and the weight and speed of the vehicles. The asphalt <br />surface prevents ponding, provides erosion control, and provides road <br />surface stability. <br />TR 92-18 Revised 07/08/99 <br />10 <br />