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<br />P&M should specify to which requirements the requested exemptions for the road <br />pertain, and include the demonstrations required by Rule 4.03.2(1)(e). <br />5. Exhibits 3.6-3 and 4.6-21 show drainage runout points, flow paths, and sediment control <br />structures for the Goat Trail. Are these the only places where runoff will leave the <br />berm and ditch system? <br />6. Please provide the Division with a detailed analysis of the ditch designs. Specifically, <br />P&M should verify that given the steep grades, the proposed ditches have the capacity <br />to convey expected flows, and that the ditches would be nonerodible. <br />7. Page 3.6-3 includes discussion about rip rap forming rock filters at road drainage runout <br />channels. Please provide the Division with additional details on the rip rap filters (ie: <br />average size (D~) and size distribution of the rock, how thick will the layer be, etc.), and <br />demonstrate that the filters will be adequate to control erosion. <br />7. A statement on page 3.6-3 says that the length of rip rap filters in the runout channels <br />will be dependent on equipment availability and equipment operator safety <br />considerations. We agree that those concerns aze valid. However, P&M should address <br />channel protection for the runouts in the event that rip rap filters are not feasible. <br />Please evaluate the accessibility of each runout requiring channel protection, and for <br />those runouts not where rip rap filter construction is not possible, include specifics on <br />what type of protection is proposed. <br />Should you have any questions or need additional information, please contact me. <br />Sincerely, <br />Susan L Burghfaier <br />Reclamation Specialist <br />c: Brian Gontarek, P&M <br />SLB\091593.WP <br />avt ever m 2 eptem er 1 1 3 <br />