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4/J <br />.~ / <br />INBPECTION REPORT <br />Bite: National Kinq Coal Mine, Hesperus, Colorado <br />Inspected By: Don R. May, P.E., Project Engineer <br />inapeation Date: Quarterly Inspection, March 12, 1994 <br />Ponds: The east and west sedimentation ponds are in good <br />condition. There are no signs of erosion or excessive filling in <br />of the ponds or the approach channels. Photograph #1 shows the <br />West Pond, its front embankment and the spillway. The spillway <br />for the West Pond is shown in photograph #2. Although the <br />spillway face is currently stable, additional rock should be <br />placed on the top and front face. Recent recalculation of the <br />outflow from the West Pond during the design events shows that <br />the low level orifice is about 3 ft to high. It should be lowered <br />to elevation 7994 about 1 ft above the low point of the pond. The <br />low flow outlet on the West Pond is partially blocked and should <br />receive periodic cleaning, photo #3. <br />The East Pond is seen in photo #4. A low spot on the embankment <br />has been filled in accordance with the embankment technical <br />design. The pond and its embankments are in good condition. <br />Drainage Ditches: All other ditches and pipes were clean and <br />appeared in good condition. <br />Coal Waste Pile: Photographs $5 and #6 shows the toe and slope <br />of the coal waste pile respectively. The placement of new <br />material can be seen in photograph #5. Waste cinder block are <br />visible near the right side of #5. There are no signs of <br />instability on the waste pile. The drainage ditches at the top <br />and bottom of the pile need to be completed in accordance with <br />the revised plan. Placement of new material on the pile has been <br />completed in a configuration which is in accordance with the <br />technical design. <br />