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=~ ~ <br />INSPECTION REPORT <br />Site: National King Coal Mine, Hesperus, Colorado <br />Inspected By: Don R. May, P.E., Project Engineer <br />Inspection Date: Quarterly Inspection, July 2, 1995 <br />t <br />Ponds: The east and west sedimentation ponds and their embankments are in good <br />condition. As seen in photo #1 sediment in the west pond is being removed as part of <br />routine maintenance. It is recommended that a measuring staff, marked in feet with zero <br />at the bottom be placed in the ponds with the zero mark at the design, bottom elevation. <br />This will allow easy visual evaluation of sedimentation. The outlet works for the West <br />pond have not been changed, see previous reports for recommendations. Photo #2 <br />shows the east pond. <br />Drainage Ditches: There are several locations along the Eastside drainage channel where <br />heavy vegetation, especially oak brush is establishing itself within the channel and could <br />obstruct flow in the future if not removed. See photograph #3. The channels are stable <br />and appear to be adequately handling all flows. <br />The drainage ditch along the top, back of the waste pile is very shallow and not well <br />defined. In addition, the transition this ditch makes on the north end of the pile, off the <br />top of the pile around to the front, bottom of the pile is poor and results in ponding, <br />photo #4. In general this ditch from its beginning, on top of the pile to its termination in <br />the lower yard is in need of some work. All other ditches and pipes appeared in good <br />condition. Photograph f15 shows the drainage features in the yard. <br />Except for the items cited above all drainage features have been constructed and are <br />operating as stated in the drainage plan submitted to the Division of Minerals and <br />Geology. <br />Coal Waste Pile: There are no signs of structural instability on the waste pile. Recent fill <br />appears to have been placed on the top instead of at the bottom of the pile, photo #6. <br />Unless some specific condition requires placement on the top, the plan calls for <br />placement at the bottom of the pile in order to facilitate reduction of the face slope. The <br />volume of new waste material appears to have increased over previous periods. The <br />highwall and other slopes at the site appear stable. The fill on the waste pile has been <br />constructed as specified in the design approved by the Division of Minerals and Geology. <br />