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D <br />Mr. Brock Bowles <br />April 10, 2015 <br />Page 2 <br />revised to begin storage capacity at the sediment capacity level of 5,650.0' which <br />represents worst case for peak sediment concentration. <br />2. Regarding the update of the as -built drawing of Pond 008, the Map 2.05.3(3) -4 -2 shows <br />the drainage area to be 102.9 acres but the SEDCAD was run using 110.436 ac. <br />(Attachments 2.05.3(3) -4 -2 and 2.05.3(3) -4 -4). Please clarify the proper acreage for the <br />drainage basin for Pond 008. <br />Response: The SEDCAD demonstration has been revised to show a total drainage area <br />of 110.43 acres which is consistent with the drainage area shown on Map 2.05.3(3) -4 -1, <br />Pond 008 Drainage Area. <br />3. In Attachments 2.05.3(3) -4 -2 and 2.05.3(3) -4 -4 of the approved permit, the units are <br />inconsistent across the two analysis. The inconsistencies are in total area (AC vs SQ FT), <br />gross erosion, total yield, run -off volume, sediment volume and total volume. The <br />Division cannot complete its review of the culvert change for Pond 008 with the currently <br />approved SEDCAD runs. Please make units consistent across the input and output <br />datasets in Attachments 2.05.3(3) -4 -2 and 2.05.3(3) -4 -4 and re- submit the SEDCAD runs <br />of the Pond Volume Calculations for both the 10 and 25 year 24 hour events. <br />Response: The SEDCAD demonstrations for both the 10 and 25 year 24 hour events <br />have been resubmitted in order to make the units consistent across the input and output <br />datasets in Attachment 2.05.3(3) -4. <br />4. At the bottom of Map 2.05.3(3) -4 -2, Exhibit 2.05.2 -18 is referenced for more detail about <br />the discharge structure of Pond 008. The Division was not able to located Exhibit 2.05.2- <br />18 in the permit but was able to review the discharge structure on Map 2.05.3(3) -4 -3. <br />Please clam the correct drainage structure detail map for Pond 008 on Map 2.05.3(3)4- <br />2. <br />Response: The footnote at the bottom of Map 2.05.3(3) -4 -2 has been changed to <br />reference Map 2.05.3(3) -4 -3 rather than Exhibit 2.05.2 -18. <br />5. With regard to the restoration of the BB Road west of 27.00 Road, SEDCAD analysis by <br />the Division indicated that the proposed restoration was consistent with Rules <br />2.05.3(3)(c) Operation Plan and 4.03.1(4) Roads and that the designs were consistent <br />with the 10 and 25 year 24 hour events. <br />Response: No response required. <br />AN EQUAL OPPORTUNITY / AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy' Cooperative <br />