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The following Items accompany this submittal: <br />• Exh. 7-231-1-1 through 37 <br />ENGINEERING CERTIFICATION <br />I am a Licensed Professional Engineer in the State of Colorado and a representative of <br />Environmental Solutions, Inc., P. O. Box 2996, Cheyenne Wyoming. The information contained <br />in this document was provided by Colowyo Coal Company. Being familiar with the Colowyo <br />operation and the coal permitting process in Colorado, the information contained herein is <br />reasonable and correct to the best of my experience. <br />00`00 L / C i <br />• <br />o�P. ....... F,, <br />J' <br />o ••: c. pet, r^ <br />U •O5 o• <br />32257 Z <br />/4 <br />•' ��• <br />j OAF ••••....•• K\ <br />S'S/ONAL ������ <br />32257 <br />Exh. 7-23H-4 Revision Date: 11/09/15 <br />Revision No.: PR -04 <br />