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6. When reviewing the Immediate Contributing Acreage for each Structure within the SedCAD model, it appears that <br /> Structure 912 is missing 2.4 acres from what the Division has calculated. This acreage seem to correspond to small <br /> acreages associated with curve number CN61.Please review the contributing acreage for Structure 912 and update the <br /> associated SedCAD model's Immediate Contributing Acreage as necessary. <br /> 7. When reviewing the Immediate Contributing Acreage for each Structure within the SedCAD model,it appears that both <br /> Structure 928 and Structure 930 are missing 0.3 acres from what the Division has calculated. These acreages seem to <br /> correspond to small acreages associated with curve number CN62 for both Structures. Please review the contributing <br /> acreage for both Structure#28 and Structure#30 and update the associated SedCAD model's Immediate Contributing <br /> Acreage as necessary. <br /> 8. When reviewing the Structure Networking, Structure 924(EP1)reports to Structure 914 and by-passes Reach 1 of the <br /> Final East Pit Ditch. Additionally,there is no Structure assignment for Reach 1 of the Final East Pit Ditch along with <br /> the associated Immediate Contributing Acreage. Please provide an updated SedCAD model including Reach I of the <br /> Final East Pit Ditch and associated Immediate Contributing Acreage with a corrected Structure Networking. <br /> 9. When reviewing the Structure Details in the associated SedCAD models for Structure 924 (EP1), a straight pipe has <br /> been included as part of the spillway discharge design. Based on the Structure Networking, Structure #24(including <br /> straight pipe discharge)reports to Structure 923(EP3 Inlet Ditch).However,when reviewing proposed Figure Exh. 7- <br /> 14PP-3,the straight pipe is shown reporting to Reach 1 of Final East Pit Ditch(see Comment 4 for additional items). <br /> Please provide one of the following items: <br /> • Additional rational for having the straight pipe spillway reporting to Structure 923 rather than the Reach 1 of <br /> the Final East Pit Ditch as shown on Figure Exh.7-14PP-3, <br /> • Updated SedCAD models showing the straight pipe discharge of Structure 924 reporting to Reach 1 of the <br /> Final East Pit Ditch or, <br /> • Updated Figure Exh.7-14PP-3 showing the straight pipe spill way reported to EP3 Inlet Ditch(Structure 923). <br /> If you have any questions,feel free to contact me. <br /> Sincerely, <br /> Zach Trujillo <br /> Environmental Protection Specialist <br /> (303) 866-3567 ext. 8164 <br /> Zach.Trujillogstate.co.us <br />