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Zach Tru'illo <br />- 2 - December 21, 2011 <br />5. DRMS - Please provide an explanation for why a berm is required along the north side of the <br />proposed SAE when an embankment at this location already exists for Pond 007A. <br />NECC - A berm is not required on the north side. Page Exhibit 19(17) -1 was revised. <br />6. DRMS - It is unclear what happens with the drainage in the area west of the proposed SAE and <br />east of ditch D24. Does this area drain to the ditch or should the SAE be extended to the west to <br />include this area? <br />NECC - The drainage west of the proposed SAE drains to the west towards D24. <br />7. DRMS - Regarding the SEDCAD input, please provide an explanation for the use of the input <br />value of 10 gpm per square foot. This value is at the high end of the range of values recommend <br />in the SEDCAD 4 Design Manual and User's Guide. <br />NECC - The flow rate for the silt fence was reduced to 5 gpm/SF. <br />8. DRMS - Regarding the SEDCAD output, the peak concentration of the treated runoff is reported <br />as 1.00 mL/L. However, 0.5 mL/L is the daily maximum effluent limitation for a 10 -year, 24 -hour <br />event in the CDPS permit for New Elk Mine. Please provide one of the following: <br />• Explanation as to why this exceedance is acceptable, <br />• a revised SEDCAD demonstration, or a redesigned sediment control for the SAE. <br />NECC - A revised SEDCAD demonstration is attached. <br />9. DRMS - The Division has conducted its own Cost Summary (attached) with a total bond amount <br />of $7,048.50 for TR -61. The total bond amount submitted by NECC for TR -61 is $7,372. If <br />NECC wishes to use the total bond amount calculated by the Division, please submit an updated <br />cost summary for TR -61. <br />NECC - Exhibit 28 was amended to incorporate the DRMS reclamation estimate. <br />Sincerely, <br />J. E. Stover, P.E. <br />Consulting Engineer <br />cc: Ron Thompson, NECC <br />Mike Trujillo, CDOW <br />Attachments: (3) <br />TR -61 Transmittal letter dated December 21, 2011 <br />TR -61 Exhibit 28 Bond Estimate dated December 21, 2011 <br />TR -61 Exhibit 19(17) dated December 21, 2011 <br />TR -61 Map 11, Sheets 1, 2 and 3 revised December 20, 2011 <br />