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Colowyo Coal Company, L.P. <br />Colowyo Mine <br />2007 PHASE II REPORT <br />REVEGETATION UNITS INCLUDED <br />IN PHASE II SAMPLING: <br />REFERENCE <br />AREAS: <br />EP028 WP003 S16010 <br />EP029 WP004 S16014 <br />EP030 WP005 <br />EP031 WP006 <br />EP032 WP007 <br />EP033 WP008 <br />EP034 WP009 <br />EP035 WP010 <br />EP036 WP011 <br />EP037 <br />EP038 <br />EP039 <br />EPO40 <br />EPO41 <br />EPO42 <br />EPO43 <br />EPO44 <br />1.0 INTRODUCTION <br />MOUNTAIN SHRUB <br />SAGEBRUSH <br />Cedar Creek Associates, Inc. (Cedar Creek) was contracted in 2007 by Colowyo Coal Company <br />(Colowyo) to evaluate revegetated units for Phase II bond release at the Colowyo Mine. Monitoring was <br />performed in the interest of ascertaining progress toward revegetation success in general accordance <br />with Rule 3.03, Release of Performance Bonds. The revegetated areas evaluated in 2007 consisted of all <br />or part of 28 units in East Pit, West Pit, and Section 16. In addition, two reference areas (Mountain <br />Shrub and Sagebrush) were sampled to provide cover comparison values to facilitate an evaluation of <br />success for the reclaimed units. The sample points for Phase II bond release and reference areas <br />evaluated in 2007 are provided on Maps 1 — 3 (Appendix A). <br />CEDAR CREEK ASSOCIATES, Inc. Page 1 Colowyo Coal Company <br />2007 Phase II Evaluation (Updated Dec -10) <br />