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Southfield Mine <br />Minor Revision Request No. 16 <br />South Fan Installation <br />noise levels will be almost imperceptible due to the combination of <br />distance attenuation and barrier effect. <br />Reclamation and Closure <br />Upon completion of mining in the southern portion of the Southfield <br />reserves or when the south fan installation is no longer required to <br />provide adequate ventilation, EFCI will remove the fan installation, seal <br />the fan portal and reclaim the associated disturbance areas. <br />The fan housing, fan, drive motor and associated control and monitoring <br />systems will be removed from the site and either salvaged, if still in good <br />operating condition, or sold as scrap. Since all electrical distribution <br />components will be owned by SCPC they will be responsible for removal <br />and final disposition of powerlines, poles, transformers and related <br />component <br />Foundations will be broken up and removed and resulting debris will <br />either be backfilled in the fan portal or placed at the toe of the portal <br />bench to be covered by subsequent fill placement. <br />A permanent seal will be constructed on the fan portal to prevent access <br />and enhance the long-term stability of the portal area. The seal will be <br />a double concrete block wall keyed into the mine entry at least 6 inches <br />on all sides. Seal construction is illustrated by Figure 21, Typical Portal <br />Seal, in the EFCI permit document. Areas inby the seal will be timbered, <br />bolted, backfilled or otherwise supported to prevent caving which could <br />affect the seal. An MSHA approved sealant will be used on the outer <br />surface of the seal to provide a barrier against water movement. <br />,ziz~ia, .,,,, 13 <br />