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West Pi[ Fill InsoeeNon Certfflcation <br />On December 8, I inspected the area in which the West Pit Excess Spoil Fill is being constructed. <br />The purpose of this inspection was to observe the surface rock drain that borders the 3HaV <br />Excess Fill Slope, inspect the areas dumped to final grade below the 7,400 dump elevation, <br />inspect the revegetalion on the fill surface, inspect the fll 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 />satisry the requirements of CDMG Rule 4.09.10 (1 a) and Rule 4.09.1 (10). <br />During the inspection, it was observed that the conddion of the fill was good and that no seeps or <br />springs were noted. The wllection ditches at the 6,950, 7,050, and 7,150 elevations all were in <br />relatively good shape. The ditch at the 7,250 elevation needs to be completed to the west end of <br />the fll. No water was evident in the surface drein or underdrains. Although much of the slopes <br />were snow-covered, na erasion problems with the ditches were noted. <br />In addition, I reviewed the monument survey data. These data indicate that the elevations of most <br />of the monuments have not signiFlcantly changed (typically less than 0.05 feet of elevation <br />change) with the mast movement noted in the 6950 Easi monument (-0.08fieet). Based on these <br />data, the total displacement of the monuments is not of concern with regard to the stability of the <br />dump. There was also no evidence of structural weakness or other hazardous conditions <br />associated with this dump. These monument survey data are available for review upon request at <br />the Colowyo Mine site. <br />I am a Registered Professional Engineer in the State of Colorado and a representative of <br />Environmental Solutions, Inc, P. O. Box 522, Gillette, Wyoming. Being familiar with the Colowyo <br />operation and the coal program permitting process in Colorado, the construction activities related <br />to the West Pit Excess Spoil Fitl are in cronfonnance, to the best of my knowledge and experience, <br />as specifed in pages I a-2 through I a-4, Exhibit 19 I b and other applicable requirements of the <br />approved permit documents, a portion of CDMG Permit C-81-019. <br />1N¢Pp0 ~ L r ~fy 4 <br />O ' <br />O G. P(r~..J`~ <br />u ' 32257 " o <br />i ... ~ <br />f z~2o~ob <br />xc: Mr. Kurtis Blunt, Calowyo Coal Company, L. . <br />cf 17.15.1 2005 <br />cf 24.20 (West Pit) <br />