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HYDRO24180
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Last modified
8/24/2016 8:44:21 PM
Creation date
11/20/2007 4:27:48 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981035
IBM Index Class Name
Hydrology
Doc Date
10/24/2002
Doc Name
4th Quarter 2002 Sediment Pond Inspection
From
National King Coal LLC
To
DMG
Permit Index Doc Type
Sediment Pond Inspections
Media Type
D
Archive
No
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iNSPECTtON REPORT <br />SiEe: National King Coal Mine, Hesperus, Colorado <br />Inspected ay: Don R. May, P.E., Project Engineer <br />Inspectton Da6e: QuarteNy Inspection, October 6, 2002 <br />Ponds: The east and west sedimentation ponds and their emba»kmerrts appear i» goad, <br />General condition. Photo t shows the west pond and photo 2 shows the east. Both have <br />some water present. Periodic maintenance of the ponds outlet works should be carried out <br />to assure that the k~w flow pipe is Gear of debris on troth ends. The spillway should also be <br />cleared of any debris. Photo 3 shows the lower low level outlet for the west pond. The <br />lower yard area around the ponds is well drained and operating acxording.to the <br />reclamation pla». <br />Drainage Ditches: The eastside and westside drainage channels appear in good general <br />condition. The armored ditches that run down the sides of the waste-pile are performing <br />well. The dRch on the upper, »orth side of the waste pile is a "dean water ditch" and should <br />be kept free of coal waste material. Photo 4 shows a section of this ditch where the haul <br />road nears the top of the pile. Care should be taken in this area to assure that coal is not <br />washed down the dean water ditch, photo 5. <br />Other ditches, pipes and structures in and arourxl the yard were inspected and appear in <br />good condition. All drainage feature.9 have been constricted and are operating as stated in <br />the drainage plan submitted to the Division of Minerals and Geology. <br />Coal Waste Pile: There are no visible signs of structural instabiNty on the waste pile. The <br />fie of the pile is in good shape. The top of the pile, as shovm in photo 6 is also in good <br />shape. This surface shoukt sk,pe to the intercept ditch at a slope of 196 to 296. <br />h is important that the waste material t1e placed in lifts nOt to exceed 12° to f 8' and that <br />compaction results in the density stated in the design report. It is not possible to determine <br />this by visual i»specGon and therefore the density should Ue periottiplly checked by <br />measurement in addition, it is recommended that the upstream end of the waste pile <br />underdrain be kxated and marked. As the pile grow this task will tlecorrre more difficulty. <br />F~roept 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 Geology. <br />.~ <br /> <br />
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