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COLORADO YAMPA COAL COMPANY <br />CERTIFICATION INSPECTION FOR DRAINAGES <br />DATE OF INSPECTION September 230, 1988 <br />INSPECTION ACTIVITIES <br />o Checked bedding and riprap placement and final channel <br />configuration for Drainage 51 <br />o Checked bedding placement for Drainage 51W <br />o Checked bedding and riprap placement and channel configuration <br />for Drainage 31-1 <br />FINDINGS <br />o Bedding and riprap placement have been completed for Drainage <br />51 except for the upper key cut. Placement looks good with <br />adequate thickness, good gradation, and a well defined <br />channel. Bower Bros. will complete grading of sideslopes and <br />channel tie-ins. Suggested to Terrill Johnson and Bud Bower <br />that some excess rock be placed as check dams or water bars to <br />control flow velocities and minimize erosion below drainage. <br />o Bedding placement has been completed for Drainage 51W. <br />Placement thickness on channel bottom is adequate. However, <br />bedding has not been carried high enough on channel <br />sideslopes. Talked with Terrill Johnson and Bud Bower about <br />the problem. Bower will bring in additional bedding and place <br />it at full thickness to top of flow channel. <br />