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<br />COLORADO YAMPA COAL COMPANY <br />CERTIFICATION INSPECTION FOR DRAINAGES <br />DATE OF INSPECTION July 15, 1988 <br />INSPECTION ACTIVITIES <br />o Checked grade and channel dimensions for Drainages 31-1 and <br />31-2 <br />FINDINGS <br />o The channel of Drainage 31-1 was visually inspected for <br />uniformity of grade. One 50' section which appeared to be <br />over-steepened was checked. Grade for this section was 16.5 <br />compared with the design of 15.3%. The Engineer indicated <br />that additional grading would be required to achieve the <br />design gradient. The channel will be rechecked upon <br />completion of reoradino. <br />The channel appeared to have a uniform cross-section. A spot <br />measurement indicated a channel bottom width of 13' and top <br />width of 33' compared to design widths of 12' and 27' <br />respectively (Design widths are minimum values. A greater <br />channel cross-section is acceptable). <br />o The channel of Drainage 31-2 was visually. inspected for <br />uniformity of grade. Grade was checked over a 50' section of <br />what appeared to be the steepest section. Grade for the <br />section checked was 24.3 compared with the design of 21.6%. <br />The Engineer indicated that additional grading would be <br />required to achieve the design gradient. The channel will be <br />rechecked u~onsompletion of regrading. <br />