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Since SCC is not committing to maintaining the structures in the current configuration or <br />providing design information, however, SCC must demonstrate that Pond 016 is adequately <br />sized to treat the runoff from a 10-year/24-hour event if the stock tanks are silted in (null <br />structures). Please revise the SEDCAD design to designate the stock tanks as null structures. <br />In addition, SCC should submit an additional SEDCAD run for the 25-year/24-hour event to <br />verify the adequacy of the emergency spillway channel sizing, and updated design (sizing) <br />information for all of the postmining drainage channels and culverts in the Pond 016 <br />watershed that are affected by the TR-73 revised drainage plan. <br />26. This response will be considered adequate in conjunction with an appropriate response to <br />Item 26. <br />27. Response accepted. <br />28. Response accepted. <br />29. Response accepted. <br />30. Response accepted. <br />31. Response accepted. The approved rill and gully remediation plan (p 38 of Tab 22) allows for <br />construction of V shaped channels 16-20 feet wide where concentrated flows warrant <br />corrective actions. <br />Please call me if you have any questions or need additional information. <br />Sincerely, <br />5MOL4-? <br />Susan L. Burgmaier <br />Environmental Protection Specialist <br />cc: Marcia Talvitie, DRMS <br />Sandy Brown, DRMS <br />Page 4 of 4