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~~ <br />INSPECTION REPORT <br />Site: National King Coal Mine, Hesperus, Colorado <br />lrrspected t3y: Don R. May, P.E., Project Engineer <br />frtspection Date: t]uarterly Inspection, July 28, 2002 <br />Pon ~ The east and west sedimentation ponds and their embankments appear in good, <br />general condition. Photo 1 shows the west pond with some water present. Periodic <br />maintenance of the pond outlet works should be carrk:d out to assure that the krw flow pipe <br />is dear of debris on both end. The spillway should also lie cleared of any debris. Photo 2 <br />shows the lower yard area which is well drained and operating according to the reclamation <br />plan. <br />Drei~e Ditches: The eastside and westside drainage diannels appear in good ger~ral <br />condition. The armored ditches that run down the sides of the waste pile are performing <br />well. The ditch on the upper, north side of the waste pile is a "dean water ditch" and should <br />be kept free of coal waste material. Photo 3 shows a section of this ditch. This dddt <br />should be maintained such that water coming from upstream areas can floYV unimpeded <br />abng the top of the new access road without being contaminated with coal material. <br />The entrance to a drainage pipe behind the shop is nearly blocked, photo 4. Other ditches, <br />pipes and structures in and around the yard were inspected and appear in good wndition. <br />All drainage features have been constructed and are operating as stated in the drainage <br />plan submitted to the Division of Minerals and Geology. <br />Coal Waste Pile: There are no visible signs of stnxtural instability on the waste pile. The <br />face of the pile is shown in photo 5. The top of the pile is in good general condition. The <br />surface should be kept as smooth and uniform as possible so that runoff can flow across <br />the pile to the lower side drainage ditch, shown in photo 6. <br />it is important that the waste material be placed in lifts not to exceed 12° to 18" and that <br />compaction resuRs in the density stated in the design report. It is not possible to determine <br />this by visual inspection and therefore the density should be periodically checked by <br />m~surement. In addition, it is recommended that the upstream and of the waste pile <br />underdrain Ue located and marked. AS the pile grow this task will become more difficulty. <br />Except for the items mentioned above the waste pile has been constructed as stated in the <br />reclamation plans submitted to the Division of Minerals and Geobgy. <br />