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Haulroads are constructed during the summer months when practicable. For this reason, temporary <br />erosion controls during the construction of haulroads are usually not required except where <br />construction occurs in the bottom of a drainage. In cases such as this, sedimentation ponds would be <br />the primary control of suspended solids. Diversion ditches are also used when necessary. <br />Topsoil is not replaced on either embankment or cut sideslopes. Many haulroads are in existence for a <br />short period of time. Often by the time the slope could be topsoiled and stabilized with vegetation, the <br />haulroad is abandoned and the area must be reclaimed. Moreover, topsoil placed on a cut or fill must <br />eventually be salvaged again before the road is reclaimed and then replaced again. Each time topsoil <br />must be handled, a certain amount of loss and contamination occurs. Instead of trying to topsoil and <br />revegetate side slopes to provide stabilization, ditches, berms and diversions are used at the Trapper <br />Mine to minimize runoff on the slopes. In addition, the untopsoiled slopes may be seeded to adapted <br />grasses. <br />The construction practices for haulroads at the Trapper Mine are certified by a registered professional <br />engineer. Occasionally, modification to these specifications is necessary for site specific situations <br />where alternate engineering practices are more practicable. However, any modifications to these <br />specifications is never such that the structural integrity of the road is affected, nor is any modification in <br />conflict with applicable Division regulations. Certification of existing haulroads are contained in <br />• Appendbt S. <br />• <br />The design and construction criteria are appropriate for the anticipated volume, weight and speed of <br />the haulage vehicles. <br />3.7.2.3 Drainaqe. <br />Haulroads at the Trapper Mine are designed, constructed and maintained in a manner consistent with <br />our reclamation program to provide adequate drainage and safety pass the runoff from a ten-year, <br />24-hour runoff event with up to <br />3-166 <br />PR -3 <br />