Laserfiche WebLink
• All temporary drainage crossings are designed for the 10 year 24 hour event and all <br />permanent drainage crossings are designed for the 100 year 24 hour event, as shown on <br />Map 2.05.3(3)-1 Surface Hydrology and Attachment 2.05.3(3)-1-3 Collection/Diversion <br />Culverts and Ditches. The map shows the details of the drainage basins and the Attachment <br />shows the designs of the culverts and roadside ditches. <br />The same equipment and procedures for compaction that are described in the <br />Demonstration for the NE Perimeter Haul Road were also used for this road. The road has <br />been in place since 1993 without any problems of stability, erosion, puddling, crown <br />problems, or any other issue that could result in damage to the environment. The road is <br />also entirely within the disturbed area of the mine. The road was constructed on grade (with <br />the exception of the Pond 007 Crossing described below) and only minor fills of 1' to 2' <br />height were used. The sideslopes are a maximum of 3H:1 V and are well vegetated. <br />The 5'" Street Light Use Road crosses Pond 007 at approximately station 45+00, as seen on <br />Map 2.05.3(3)-8. A professional engineer has prepared a report detailing this section of the <br />road and the embankment stability near Pond 007. The report for this crossing can be found <br />• in Attachment 2.05.3(3)9. A pair of 42" CMP's under 5"' Street deliver water from the <br />northern section of Pond 007 to the southern section before it is released into Calamity <br />Draw. This crossing has functioned without any problems for approximately 12 years. <br />Reclamation. The portion of the road that is truly along 5"' Street will remain (from Station <br />23+50 to the end at 53+80. The County has agreed to accept this road into their road system <br />once the mine is reclaimed. This was approved as part of the Special Use Permit in 1999. <br />The portion of the road from 0+00 to 23+50 will be reclaimed according to the procedures <br />described below. <br />WFC will reclaim alight-use road when it is no longer needed in accordance with the <br />reclamation plan, described in Section 2.05.4. The road will be closed to vehicular traffic. <br />The natural drainage patterns will be restored. All culverts will be removed. Roadbeds will <br />be ripped, plowed or scarified. Cut and fill slopes will be rounded or reshaped and blended <br />into the surrounding topography. Cross drains, dikes or water bars may be constructed to <br />control erosion as required. Road surtaces from which topsoil has been removed wilt be <br />covered with topsoil and revegetated in accordance with the reclamation plan. <br /> <br />(Revised July 2006) 2.05.3(3}42 <br />