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West Pit Fill Inspection Certification <br />On September 21, 2009, 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 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 CDMG Rule 4.09. 10 (1a) and Rule 4.09.1 (1 b). <br />During the inspection, it was observed that the condition of the fill was unchanged and stable. All <br />portions of the fill were visible. A small flow of about two gallons per minute is evident from the toe <br />of the underdrain. A second small flow of less than two gallons per minute was noted near the point <br />where the toe of the fill intersects the access road for the West Pit Pond. This flow was primarily a <br />result of surface water runoff but is probably supported by some contribution from the toe of the <br />underdrain. No erosion problems were noted. No other seeps or springs were noted. <br />In addition, I reviewed the monument survey data collected September 4, 2009. These data <br />indicate that the elevations of most of the monuments have not significantly changed (typically less <br />than 0.05 feet of elevation change per calendar quarter). The most change as recorded at two <br />monuments, namely the 7250 West and the 7150 Mid. Both of these sites registered a decrease of <br />0.07 feet. Based on these data, the total displacement of the monuments is not of concern with <br />regard to the stability of the dump. There was also no evidence of structural weakness or other <br />hazardous conditions associated with this dump. These monument survey data are available for <br />review 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 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 1 b and other applicable <br />requirements of the approved permit documents, a portion of CDMG Permit C-81-019. <br />`?%W- <br />C. 'Poe. <br />% <br />32257 i ! <br />o :.•9/z41t.)0 ? <br />cis, "•.,...•'' ?\ <br />S'JONAL F-.a1???? <br />32257 <br />- -.91Z6At?? <br />UAI,t <br />xc: Mr. Kurtis Blunt <br />cf 17.15. <br />cf 24.20 (West Pit)