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EFCI will also backfill and regrade all existing sedimentation ponds and associated <br />drainage structures. However, backfilling and regrading of these structures will not <br />• occur until approximately five to ten years after mine closure following the <br /> Division's determination of revegetation success. Generally, backfilling <br />sedimentation ponds will involve pushing pond embankments into pond basins <br />after the ponds have been drained, and regrading backfilled pond areas to blend <br />with surrounding terrain. <br />Reclamation of collection and diversion ditches associated with Southfield <br />drainage and sediment control networks will generally involve minimal grading <br />since material excavated to establish these ditches is generally placed <br />downgradient and adjacent to the ditches. Backfilling and grading will simply <br />involve pulling this material back into the ditches and blending backfilled areas <br />with adjacent lands. <br />Reclamation of the south mine fan installation will involve sealing the fan portal, <br />• backfilling and grading the associated portal area, and grading material stockpile <br />areas. Since all affected areas have previously been disturbed and the fan <br />installation will involve minimal redisturbance, the post-mining configuration <br />illustrated by the South Mine Fan Installation Post-mining Topography and Cross- <br />Sections Map, (Map 31) will not vary significantly from existing topography. <br />The light-use road to the Newlin Creek topsoil stockpile was designed and <br />constructed, and subsequently approved by the CDMG as a permanent light-use <br />road. Design and construction details, including information on associated <br />drainage structures, were previously provided in the Newlin Creek Mine permit <br />document (refer to Erosion Control Plan for Postmining Roads, Ditches, and <br />Discharge Outfalls, -Newlin Creek Mine (Permit No. C-81-045)). Drainage <br />features for this road include roadside ditches with rock check-dams, a culvert <br />(Culvert A), a riprap-armored Arizona crossing, and water bars on the road <br />surface, to control surface drainage and minimize erosion. In order to provide <br />• long-term drainage controls for this approved permanent road, these drainage <br />features will be retained. <br />MR-44 2.05.4-11 Revised -May 2002 <br />