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PeabjLtq <br />Peabody Sage Creek Mining, LLC <br />June 24, 2014 <br />Janet Bums <br />Division of Reclamation, Mining and Safetv <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 -2273 <br />Peabody Sage Creek Mine <br />PO Box 250 <br />36600 Routt County Road 27 <br />Hayden, CO. 81639 <br />RE: Peabody Energy Seneca Coal Company, Seneca IIW Mine (C- 1982 -057) Phase III Bond Release Application <br />Adequacy Response (3) <br />Dear Ms. Binns: <br />Seneca Coal Company provides the following responses to the Division's second adequacy review of the SL -5 Phase II <br />bond release application for the Seneca IIW Mine (C- 1982 -057). The Division's adequacy review letter is dated June 6, <br />2014. Please see the responses for items 9a and 9b as presented in the Division's letter. <br />9a. The Division requested other data to indicate trends of decreasing sediment loading into the ponds. The following <br />graphed data from 2004 to 2013 annual sediment surveys for Ponds 005, 006, 009 and 016 show that sediment loading has <br />stabilized. In 2008 and onwards, improved pond capacity measurements methods were used. A review of the 2008 to <br />2013 period shows relatively small reductions in capacity for these ponds and essentially no change in the last several <br />years, indicating little additional sediment contributed by reclaimed watersheds. <br />10 <br />3 <br />Y <br />W <br />4 <br />a <br />2 <br />D <br />8 <br />7 <br />6 <br />� 5 <br />�4 <br />3 <br />2 <br />1 <br />0 <br />POND 006 CAPACITY (2004 -2013 ANNUAL REPORTS) <br />2004 2005 2006 2DD7 20D8 2009 2010 7(11.11 3672 2013 <br />YEAR <br />POND 009 CAPACITY (2004 -2013 ANNUAL REPORTS) <br />20D4 2065 7006 2607 2OD3 2009 2010 2011 2012 2413 <br />YEAR <br />POND CAPACITY <br />TREND LINE <br />- 1 POND CAPACITY <br />- TREND LINE <br />