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Whetstgne <br />AssoaatesW Technical Memorandum <br />Land Surveyors, application of the licensee's seal, signature and date shall constitute <br />certification that the work was done by the licensee or under the licensee's responsible <br />charge. Please include a signature and date on all certified drawings, documents and <br />specifications sealed by a licensed professional engineer in the state of Colorado. <br />Cotter response: Engineering drawings in the revised DDP will be stamped, signed, <br />and dated by a Colorado licensed professional engineer (P.E.). <br />11. Plate 3. The Reach Definition Summary Table indicates there is a 50 % contraction in the <br />bottom width of the channel in the downstream direction between Reach WR DivPl and <br />WR_DivP2. This condition requires additional hydraulic head to overcome the contraction. <br />Please either demonstrate adequate freeboard is available for this additional head loss in the <br />upstream reach or redesign the upstream and /or downstream reaches to avoid this condition. <br />Cotter response: The maintenance and improvements of the WR_Divl reach and the <br />Pit Pool result in a consistent channel bottom width of 5 -ft for WR_Divl and WR_Div2. <br />No contraction is required. The channel design is shown in Plate 3 of the revised DDP. <br />12. Plate 4. Please provide riprap specifications for all three rock aprons. <br />Cotter response: Rip rap specifications have been added to new and revised plates. <br />The HydroCAD results indicate a peak velocity of 1.5 ft /s over the five foot spillway of <br />Catchment 001B -A North. The Thorne and Zevenbergen resistance equation was <br />applied to determine an acceptable rock size of 0.75 inches for the spillway and five <br />inches for the rock apron. <br />The HydroCAD results indicate a peak velocity of 0.64 ft /s over the 24 foot spillway of <br />Catchment 001B -A South. The Thorne and Zevenbergen resistance equation was <br />applied to determine an acceptable rock size of 0.75 inches for the spillway and three <br />inches for the rock apron. <br />The DRMS requires analyses, certified designs and specifications for the engineered elements <br />associated with the environmental protection plan (EPP). The cover page, all drawings and <br />specifications should be stamped, signed and dated by the responsible engineer. <br />Cotter response: The cover page, all engineering drawings (plates), and specifications <br />will be stamped, signed and dated by the responsible engineer. <br />4149A.140207 8 <br />