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• including diversion of Magpie Creek away from the mine portal area to <br />ensure that surface flows do not enter the Southfield Mine workings. Upon <br />completion of mining and related activities, mine portals will be sealed <br />and backfilled to further preclude any potential transfer of water between <br />surface and groundwater systems in the portal area. <br />4.05.17 POST-MINING REHABILITATION OF SEDIMENTATION PONDS, DIVERSIONS, <br />IMPOUNDMENTS ANO TREATMENT FACILITIES <br />No permanent sedimentation ponds, impoundments or treatment facilities are <br />planned. EFCI has however designed and constructed a permanent diversion <br />and several permanent collection ditches to provide effective long-term <br />drainage control for the permanent coal refuse stockpile. Upon completion <br />of mining and related operations and in conjunction with site reclamation <br />activities, EFCI will also complete modifications to the existing Magpie <br />Creek diversion in order to effect compliance with applicable regulatory <br />• requirements for permanent diversions. All necessary modifications will <br />be completed during site reclamation operations and prior to the end of <br />the extended reclamation liability period. <br />In conjunction with reclamation of all areas disturbed by mining and <br />related activities, EFCI will reestablish an effective post-mining <br />drainage configuration as shown on the Mine Area Post-Mining Topography <br />Map, (Map 28) and Loadout Area Post-Mining Topography Map, (Map 29). <br />Post-mining drainages have been designed in compliance with requirements <br />for permanent diversions presented in Rules 4.05.3 and 4.05.4 and provide <br />drainage distribution, and density characteristics similar to the pre- <br />mising environment. Anticipated runoff characteristics and site <br />geomorphic considerations have been incorporated in post-mining drainage <br />designs to ensure long-tern stability, minimize erosion, and prevent <br />significant additional contributions of suspended solids to area <br />drainages. <br />~1 <br />~J <br />4.05-28 <br />