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Southfield Mine Minor Revision Request No. 20 -South Fan /nsra!ladon • /S • Operating noise from the fan installation will be minimized by the type of fan being used, installation of the fan in an enclosed housing, and the location of the fan installation relative to potential receptors. Noise levels outside of the fan housing are not expected to exceed 45-50 dbA with noise levels beyond 200 feet from the installation dropping below 40 dbA. At the adjacent access road used by the landowner to the south, noise levels will be almost imperceptible due to the combination of distance attenuation and barrier effect. Reclamation and Closure (2.05.4) Upon completion of mining in the southern portion of the Southfield reserves or when the south fan installation is no longer required to provide adequate ventilation, EFCI will remove the fan installation, seal the fan portal and reclaim the associated disturbance areas. • The fan housing, fan, drive motor and associated control and monitoring systems will be removed from the site and either salvaged, if still in good operating condition, or sold as scrap. Since all electrical distribution components will be owned by SCPC they will be responsible for removal and final disposition of powerlines, poles, transformers and related components. Foundations will be broken up and removed and resulting debris will either be backfilled in the fan portal or placed at the toe of the portal bench to be covered by subsequent fill placement. A permanent seal will be constructed on the fan portal to prevent access and enhance the long-term stability of the portal area. The seal will be a • double concrete block wall keyed into the mine entry at least 6 inches on all sides. Seal construction is illustrated by Figure 21, Typical Portal Seal, w¢ rte. • P.O. Bni 7740!8 • su~a~.sP.+„a,, ~rorom 801n • (30)}879-6260