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RULE 2 - PERMITS <br />• • Sealing of Wells and Mine Openings — Wells will be reclaimed and sealed according to <br />standards set by the State Engineering Office. Mine openings will be sealed and reclaimed <br />as discussed above and in 2.05.4(g) below. <br />2.05.4(2)(c) Backfilling Plan <br />Backfilling and grading will be completed to create a stable final topography appropriate to the <br />post- mining land use when mining ceases per the approved schedule required by Section <br />4.14.1(1)(d), Backfilling and Grading. The final topographic configuration of the PSCM portal <br />facilities area is shown on Map 2.05.4 -M1, Postmining Topography, and on the Postmine Channel <br />Profiles Maps 2.05.4 -M3A through M3E. The pre PSCM topography is shown on Map 2.05.4 - <br />M2, Pre PSCM Topography. The backfilling and regrading plan for this area is based on the <br />following objectives and constraints: <br />• Backfilling will be limited to the portal excavation areas or any cuts for facilities where <br />fill is necessary to eliminate exposed highwall areas, provide sufficient cover over <br />demolition debris, achieve effective drainage, and meet the postmine topography <br />elevations. <br />• Fill material will be placed and compacted by equipment traffic to approximately 80 <br />percent of maximum dry density except the final surface will be ripped to relieve <br />compaction and facilitate revegetation. <br />• Final grading plans are designed to establish slope gradients consistent with existing or <br />reclaimed slopes to ensure a smooth transition to the undisturbed ground. Final grading <br />will eliminate any large depressions that could impound water. <br />A material balance for final Backfilling and grading activities was developed based on comparison <br />of the pre- mining or existing and the post- mining topography maps and in accordance with Section <br />4.14.2, General Grading Requirements. <br />Generally, drainage and sediment control structures including diversion ditches for undisturbed area <br />runoff, collection ditches for disturbed area runoff, sedimentation ponds (dual cell as referenced in <br />Section 2.05.3) , and localized drainage and sediment control features and alternative sediment <br />controls will either be retained during final reclamation or reconstructed or replaced by post- mining <br />drainage structures during final grading. The operational drainage and sediment control features, <br />within the disturbance footprint will be removed or reconstructed during final reclamation. Map <br />2.05.3 -M4, Drainage and Sediment Control Plan, shows the locations of all drainage channels <br />during the operations phase, while Map 2.05.4 -M1, Postmining Topography shows the locations of <br />the anticipated final drainage control system including ditches and ponds. The profiles of the <br />postmine drainage channels are shown on Maps 2.05.4 -M3A through M3E, Post Mine Channel <br />Profiles. <br />Removal and reclamation of non - permanent sediment control structures will occur following <br />CDRMS approval of final Bond Release or the drainage restoration demonstration under Section <br />. 4.05.2(2), Water Quality Standards and Effluent Limitations. Ditches will be reclaimed by reducing <br />PSCM Permit App. 2.05 -38 Revision 12/17/09 <br />