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West Pit Fill Inspection Certification <br />On March 12, 2013, I inspected the area in which the West Pit Excess Spoil Fill is being <br />constructed. The purpose of this inspection was to observe the surface rock drain that borders the <br />3H:1V Excess Fill Slope, inspect the areas dumped to final grade below the 7,400 dump elevation, <br />inspect the revegetation on the fill surface, inspect the fill for areas of water seepage or surface <br />drainage, inspect the final grade slopes below the 7,300 elevation of the Excess Fill Slope, and <br />satisfy the requirements of CDRMS Rule 4.09.10 (1a) and Rule 4.09.1 (1 b). <br />During the inspection, the visible portion of the regraded fill was observed to be stable and <br />unchanged from prior inspections. Most of the spoil pile slopes were covered with 1 to 2 feet of <br />snow. A small flow of about two gallons per minute is usually evident from the toe of the <br />underdrain, but this seep was not present during this inspection. No erosion problems were noted. <br />No other seeps or springs were noted. <br />Since December, 2011, the 102 Dragline has been performing regrading activities near the top of <br />the West Pit Fill to begin to achieve the approved postmining topography. These activities will <br />continue during future report periods, but no activities occurred this report period. The top of the fill <br />has been reduced to below elevation 7430. <br />No monument survey data was collected during this quarter due to weater conditions. <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. Being familiar with the <br />Colowyo operation and the coal program permitting process in Colorado, the construction activities <br />related to the West Pit Excess Spoil Fill are in conformance, to the best of my knowledge and <br />experience, as specified in pages I a -2 through I a -4, Exhibit 19 I b and other applicable <br />requirements of the approved permit documents, a portion of CDRMS Permit C -81 -019. <br />xc: Mr. Kurtis Blunt <br />cf 17.15.1 <br />cf 24.20 (West Pit) <br />BPD /CE` <br />OOOOOOOO 32257 S <br />1 : IL/W/3 : (4 <br />i4NAt. <br />Haw <br />THOMAS C PETERSON <br />P.E. No. 32257 <br />-4/g/(3 <br />DATE <br />