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r] <br />Mr. Rob Zuber <br />February 17, 2014 <br />Page 2 <br />DRMS Item 2: As for hydrology, the current grading and reclamation schedule was shown in <br />hydrologic analyses to be sufficient for the channels and ponds, but if you need to increase pond <br />sizes or add an additional pond higher in the watershed we can discuss this. <br />Response: Colowyo has reviewed Exhibit 7 -14C and believes the hydrologic assumptions <br />approved in the PAP do not warrant an increase in pond size or additional ponds in the channel. <br />The Taylor Tributary Ditch has been designed for a 100 year, 24 -hour event when the entire <br />watershed is reporting to the East Taylor Pond (including the East Taylor Ditch and Taylor Ditch). <br />Colowyo believes these assumptions are relevant to the proposed spoil grading plan based off the <br />currently approved post -mine topography (PMT) approved under TR -81. Furthermore, the Taylor <br />Tributary Ditch already includes three sumps which will be constructed into the post -mine <br />topography also approved under TR -81. <br />Colowyo also reviewed Exhibit 7 -14E and believes the current hydrologic assumptions for the <br />Streeter Gulch Ditch are also sufficient. Approximately half of the Streeter Gulch Ditch has already <br />been constructed and established for approximately 20 years. With this long -term established and <br />stable section of the Streeter Gulch Ditch, Colowyo believes this spoil grading schedule as proposed <br />does not warrant additional ponds in the channel or an increase in the size of the Streeter Pond. <br />If you have any additional questions or concerns, please contact Chris Gilbreath at (303) <br />254 -3291 or cgilbreath @tristategt.org. <br />Sincerely, <br />G ,W <br />Barbara A. Walz <br />Senior Vice President <br />Policy & Compliance/ <br />Chief Compliance Officer <br />BAW:TT:pvt <br />cc: Chris Gilbreath (via email) <br />Tony Tennyson (via email) <br />AN EQUAL OPPORTUNITY / AFFIRMATIVE ACTION EMPLOYER <br />A Touchstone Energy' Cooperative Kzt <br />.o� <br />