Laserfiche WebLink
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 pontls would be <br />the primary comrol 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 handfed, 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 cert'rfied by a registered professional <br />engineer. Occasionaly, mod'rfication to these spec'rfications is necessary for site spec'rfic sRuations <br />where akernate engineering practices are more practicable. However, any mod'rfications to these <br />spec'rfications is never such that the structural integrity of the road is affected, nor is any mod'rfication in <br />conflict with applicable Division regulations. Cert'rfication of existing haulroads are contained in <br />• Append'or S. <br />The design and construction crfteria are appropriate for the anticipated volume, weigh and speed of <br />the haulage vehicles. <br />3.7.2.3 Drainage. <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 safey pass the runoff from aten-year, <br />24-hour runoff event with up to <br />• <br />PR-3 <br />3-166 <br />;`.~.~~, <br />2-II -93 <br />