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<br />• Proposed backsloping operations will encroach on both the existing culvert <br />and the bwer portion of the northwest perimeter ditch. Therefore, Rockcastle <br />plans to eliminate the culvert and relocate the bwer ditch segment so that it <br />parallels the toe of the Pit 4 backsloped area as shown on the Drainage and <br />Sediment Control Map, (Map R-1) which accompanies these responses. <br />With the proposed modifications, the existing ditches should be effective in <br />intercepting and routing all disturbed area runoff to Pond 4. Proposed <br />mitigation measures and structure modifications are designed to meet specific <br />regulatory requirements for permanent drainage structures while providing for <br />effective flow routing with little or no required maintenance. <br />n <br />U <br />• <br />5- <br />