Laserfiche WebLink
-16- <br />b. The design for this ditch must address the need to rinrap the exit <br />of the diversion. The outlet velocity should be less than the normal velocity <br />of Thompson Creek. <br />c, Due to the importance of maintaining a diversion around the refuse pile <br />and due to the critical location of the pile, the Division under section 4.09.2 <br />(7) and 4.10.3(2) will require that temporary and permanent diversions built <br />around the refuse pile be designed for the 100-year 24-hour event. Revised <br />designs and calculations must be submitted and approved prior to permit approval. <br />d. The application must include a statement that the refuse pile will be <br />inspected for stability by a registered engineer or other qualified professional <br />specialist experienced in construction of earth and rock fill embankments at <br />least quarterly throughout construction and during the following critical <br />construction periods: <br />1. Removal of all organic material and topsoil, <br />2. installation of surface drainage systems, <br />3. placement and compaction of fill materials, and <br />4. revegetation. <br />The registered engineer or other qualified professional specialist shall provide <br />to the Division a certified report within two ~•:eeks after each inspection that <br />the fill has been constructed as specified in the design approved by the <br />Division. A copy of the report must be retained at the mine site. The applica- <br />tion must state that Snowmass will meet these requirements in accordance with <br />section 4.09.1(11). <br />e. The applicant should reexamine the design slope of this diversion. From <br />contours given on Nap D-302 it appears that slopes in some places will be greater <br />than 30 percent. Through these sections severe scouring of the channel will <br />result. The design slope•of 3 degrees appears too low. The ditch must be re- <br />designed or relocated to achieve uniform flow at the design velocity. <br />24. The Division requires that culvert designs for the haul road to the truck <br />dump be submitted. <br />25. Under section 2.05.3(4)(a)(ii)(D) the application must describe when and how <br />the ponds, ditches, and culverts will be removed, l•Jhere will embankments, <br />sediments, and pipes be hauled to? Be aware that under section 4.05.6(9) ponds <br />may not be removed until the revegetation requirements of section 4.15.7 have <br />been met and the area has ceased to contribute additional suspended solids above <br />natural conditions. The applicant must commit to waiting for written Division <br />approval before removing any sediment control structure. <br />26. The application needs a thorough discussion of the method of constructing <br />embankments. Type of embankment material, source of material, properties of the <br />material, method of compaction, method of site preparation, the need for excavat- <br />ing a cutoff trench, a description of the foundation and the use of antiseep <br />collars should be discussed. <br />Coal Handling Structures <br />Section 2.05.3(7) <br />The application needs a more detailed description of how and where coal handling <br />