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quality. Quality of topdressing material was marginal on CRDA -2, and did not meet the suitability <br />criteria on CRDA -1. <br />Should observation and monitoring of vegetative development on the refuse piles indicate problems <br />potentially attributable to high levels of salinity or sodium in the surface soils (e.g. significant bare <br />areas or stunted vegetation out of character with the native environment), appropriate assessment and <br />mitigative measures will be required. <br />Also with PR -5 SCC is requesting that the remaining portion of Topsoil Pile 2 at the North Portal area <br />be left in place due to guy wire anchors supporting transmission power poles buried in the remnant of <br />Topsoil Pile 2. The Topsoil Pile 2 location was inspected by the Division to assess SCC's proposal to <br />leave the remaining topsoil in place. This seems to be the appropriate course of action given the high <br />cost of relocating the guy wires. The pile is stable and well vegetated; it blends into the surrounding <br />terrain reasonably well, and does not impede the drainage pattern of the surrounding terrain or <br />impound water. <br />IV. Sealing of Drilled Holes and Underground Openings <br />The method for sealing portals is depicted in Permit Figure 14 -2. The South Mine Portals have been <br />sealed with a 24" thick concrete seal, and will be backfilled with approximately 100 feet of dirt <br />backfill extending out from the concrete seals. An underdrain will be installed in conjunction with <br />final backfilling to drain portal area seepage away from the portal backfill. Other mine area portal <br />openings were backfilled with a minimum of 25 feet of incombustible backfill. Long term mine <br />discharge (post reclamation) from the Roadside South Mine will be from a gravity discharge pipe <br />installed by angled drilling in the vicinity of the North Decline area ( Outfall 016); a back -up discharge <br />system is provided by a portal drain installed in the seal of the reclaimed Northwest Intake Portal, <br />which allows discharge through CDPS Outfall #002 via siphon tubes. Outfall 002 would only be used <br />in the event of malfunction of Outfall 016. Due to the orientation of the North Mine workings, which <br />slope away from the portal and river, and due to the elevation of the portal which is above the <br />recovered groundwater elevation, no surface discharge from the North Portal Mine is projected <br />following reclamation, and thus no provisions were made for discharge from the North Mine following <br />reclamation. <br />Exploration drill holes, boreholes, or wells not completed in an aquifer will be sealed by replacing <br />cuttings in the hole and placing a cement plug in the top of the hole from ten feet down to within three <br />feet of the ground surface. The South Fan shaft was sealed in this manner in the fall of 2000. <br />If a hole is completed in an aquifer, it will be sealed by placing an approved cement or sealant in the <br />hole from the bottom to within ten feet of the ground surface, a cement plug will be placed in the <br />upper ten feet. <br />Figure 14 -2 illustrates typical permanent mine seals, and Figure 14 -3 depicts a typical "dry hole" <br />permanent drill hole seal. <br />V. Disposal of Debris, Acid - Forming, and Toxic - Forming Materials <br />The coal refuse material to be disposed of during mining operations is not considered combustible, <br />physically unstable, or acid -toxic forming. Chemical and physical analysis for this material is <br />Permit Revision No. 5 36 July 10, 2012 <br />