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As an underground mining operation, surface disturbance associated with <br />Southfield's mining activities is minimal, and Dorchester, and <br />subsequently EFCI, have planned and located all facilities within a <br />limited area with consideration of drainage control requirements. EFCI <br />has also designed the post-mining topography and associated backfilling <br />and grading plans to effectively utilize available materials and minimize <br />disturbance of adjacent areas. Development of the design post-mining <br />topography will result in a stable configuration with relatively gradual <br />slopes and relatively short drainage paths from all disturbed areas to the <br />re-established drainage network. During reclamation, EFCI will leave both <br />regraded areas and replaced topsoil materials in a roughened condition to <br />minimize erosion and contributions of suspended solids to disturbed area <br />runoff during the critical period between regrading and re-establishment <br />of effective vegetative cover. <br />Topsoil removal and replacement operations will be scheduled and conducted <br />to minimize erosion and promote prompt revegetation. Topsoil replacement <br />• and reseeding will be scheduled to minimize the period of time during <br />which topsoil will be exposed without a protective vegetative cover. <br />Detailed discussions of topsoil removal, storage, and replacement <br />operations are presented in Sections 2.05.3, Operation Plan - Permit Area, <br />and 2.05.4, Reclamation Plan. <br />Normally topsoil replacement and revegetation will effectively control <br />erosion and runoff from mine disturbance areas. However, in certain <br />localized areas steeper slopes may be necessary, or exposure to specific <br />erosive forces may result in increased potential for erosion. In these <br />areas EFCI will utilize localized erosion control measures including <br />establishment of temporary vegetative cover, hydromulching, use of erosion <br />control netting, selective placement of sediment fences or straw bales and <br />any other localized erosion control measures which may be appropriate. <br />Because the surface disturbance associated with the Southfield operations <br />is limited, one of the most effective drainage and erosion control <br />• measures which EFCI utilizes is diversion of the surface runoff from up- <br />gradient undisturbed areas around mine and loadout disturbance areas. <br />Resulting flows are carried in diversion channels which have been designed <br />2.05.6-36 <br />