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Chris Gilbreath <br />Page 3 <br />11 August 2015 <br />0. 15 cfs? Explain the decrease in principal spillway flow (for the 25 -year event) <br />when the runoff volume increased? Is the decrease in the annual sediment <br />loading related to the increase in undisturbed area? <br />V. In Table 6, the sediment pond summary in Volume 2D, some items under the <br />other ponds require explanation. The change sheet list indicates that Table 6 <br />was updated for Streeter Pond, however edits were also made to the columns for <br />other ponds (e.g., areas for Gossard, Gulch A, Stoker Siding, Rail Loop, <br />Prospect, and East Taylor). Please explain the edits to other ponds. <br />d. Response Accepted. <br />e. Response Accepted. <br />f. Response Accepted. <br />g. Response Accepted. <br />h. Response Accepted. <br />i. Response Accepted. <br />j. The Division agrees that the slope in the SEDCAD run is acceptable. Part of the <br />discrepancy, however, stemmed from the scale on the drawing. Please correct this error <br />on this map and other maps, as appropriate. <br />k. Response Accepted. <br />1. Response Accepted. <br />in. It does not appear that the changes were made to the table (Table 4 in Volume 13). <br />Please make the changes or explain why they were not made. <br />n. Response Accepted. <br />o. Response Accepted. <br />p. Response Accepted. <br />q. Response Accepted. <br />r. Response Accepted. <br />s. Response Accepted. <br />t. Response Accepted. <br />19. Response Accepted. <br />20. Response Accepted. <br />Rule 4.09 — Disposal of Excess Spoil <br />21. Response Accepted. <br />This concludes the Division's third adequacy review letter for the Colowyo Mine's Technical <br />Revision 105. Please contact me at (303) 866-3567 X8145 or jim.starkkstate.co.us if you have any <br />questions or comments. <br />