Laserfiche WebLink
INSPECTION REPORT <br />Site:National King Coal Mine, Hesperus, Colorado <br />Inspected By: Don R. May, P.E., Project Engineer <br />Inspection Date: 2 nd Quarter Inspection, March 12, 2012 <br />236 5 . <br />�ihll.r «.e..Nl�• <br />Because of snow cover some of the surface features were not visible during the inspection <br />Ponds: Photograph 1 shows the west pond which is in good condition but may need cleaning <br />this summer. The east pond is also in good condition. The inlets, outlets and embankments of <br />both ponds were inspected and appear to be operating as designed. Some water is present <br />in the pond due to snow melt and the staff gage does not appear to accurately reflect the <br />depth. <br />Drainage Ditches: All drainage ditches were inspected. Snow in most of the ditches made <br />detailed inspection difficult but they generally appeared to be in good condition. There is at <br />least one location on the "dirty water" ditch that runs from the top of the pile down through the <br />yard and to the west pond that has experienced some erosion on the left bank (looking down <br />stream). All ditches should be inspected and repaired as needed. <br />One of the black corrugated plastic drainage pipes in the upper yard is broken (photograph <br />2). In addition the drop inlet grate does not appear to seat properly on the inlet rim. These <br />items should be repaired. Photographs 3 and 6 show pipe outlets that are part of the <br />drainage system located in and around the yard area. Care should be taken to assure that <br />pipe inlets and outlets are regular cleaned of sediment and other debris. Drainage in and <br />around the upper and lower yards is working well and both are in good shape. Except where <br />noted, all drainage features have been constructed and are operating as stated in the <br />drainage plan submitted to the Division of Minerals and Geology. <br />Coal Waste Pile: In photograph 4, a portion of the upper waste pile face can be seen and <br />appears to be stable and in good condition. Photograph 5 shows the top of the waste pile. As <br />mentioned in previous reports the cross slope of this surface should be surveyed to confirm <br />that it meets the design. In addition, the density of new fill material should be periodically <br />checked to assure design compaction. Except for any items mentioned above the fill on the <br />waste pile has been constructed as specified in the design approved by the Division of <br />Minerals and Geology. <br />