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West Pit Fill Inspection Certification <br />On October 14, 2008, 1 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 <br />borders the 31-1:1V Excess Fill Slope, inspect the areas dumped to final grade below the 7,400 <br />dump elevation, inspect the revegetation on the fill surface, inspect the fill for areas of water <br />seepage or surface drainage, inspect the final grade slopes below the 7,300 elevation of the <br />Excess Fill Slope, and satisfy the requirements of CDMG Rule 4.09.10 (1a) and Rule 4.09.1 <br />(1 b). <br />During the inspection, it was observed that the condition of the fill was unchanged and stable. <br />All portions of the fill were visible. The collection ditches at the 6,950, 7,050, and 7,150 <br />elevations all were in relatively good shape. The ditch at the 7,250 elevation needs to be <br />completed to the west end of the fill. No erosion problems with the ditches were noted. A <br />small seep of less than one gallon per minute was noted near the point where the toe of the fill <br />intersects the access road for the West Pit Pond. Only a very minimal flow of less than 2 gpm <br />is evident from the toe of the underdrain. No erosion problems were noted. No other seeps <br />or springs were noted. <br />In addition, I reviewed the monument survey data collected October 9, 2008. These data <br />indicate that the elevations of most of the monuments have not significantly changed (typically <br />less than 0.05 feet of elevation change per calendar quarter). The 7250 West monument <br />registered the most change. The vertical displacement was an increase of 0.07 feet. Based <br />on these data, the total displacement of the monuments is not of concern with regard to the <br />stability of the dump. There was also no evidence of structural weakness or other hazardous <br />conditions associated with this dump. These monument survey data are available for review <br />upon request at the Colowyo Mine site. <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 <br />activities related to the West Pit Excess Spoil Fill are in conformance, to the best of my <br />knowledge and experience, as specified in pages I a-2 through I a-4, Exhibit 19 1 b and other <br />applicable requirements of the approved permit documents, a portion of CDMG Permit C-81- <br />019. _.6111220R.. <br />00 L <br />Q.P ........ F41 <br />'O C) :x •S C. Pfl-PIP ? S <br />O <br />32257 <br />AL <br />Set. <br />.19 <br />xc: Mr. Kurtis Blunt, Colowyo Coal Compa4,Ft' 32257 <br />cf 17.15.1 /o 1/4-/De <br />cf 24.20 (West Pit)