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• ROCKCASTLE COMPANY <br />GRASSY CREEK MINE <br />Adequacy Responses <br />To CMLRD 9/13/91 Comments <br />October, 1991 <br />NOTE: This submittal includes responses only to those comments specifically <br />relating to the Pit 4 disturbance area. Responses to all other adequacy <br />comments will be submitted as a separate response package. <br />PIT 4 <br />1) Please submit the plan to backslope the Pit 4 area above Pond 4. Include <br />pertinent pond desigru if the slope reduction activities will result in changes to Pond <br />4. Inckufe bond calculations including the estimated volume of material for the <br />• work <br />Response: Rockcastle has developed a plan to backslope the existing steep <br />slope area adjacent to the east side of Pond 4. This plan reflects <br />establishment of a 3H:1V slope, with the toe of the slope extending into the <br />existing Pond 4 basin and the slope crest extending to the east edge of the <br />existing topsoil stockpile. Backsloping will involve movement of approximately <br />27,000 cubic yards of spoil material using a tracked dozer to push the <br />material downslope to establish the design configuration. <br />The south end of the steep slope area will be backsloped first with the dozer <br />working diagonally across the slope. This approach avoids disturbance of <br />the existing topsoil stockpile and provides for a relatively short direct dozer <br />push to replace topsoil on the regraded area. By proper sequencing of <br />regrading operations, Rockcastle can limit double handling to approximately <br />50 percent of the 10,000 cubic yards of topsoil to be replaced. <br />Attachment 2 <br />-1- <br />