2008-06-05_HYDROLOGY - C1981035 - Laserfiche WebLink

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INSPECTION REPORT Site: GCC Energy, Hesperus, Colorado Inspected By: Don R. May, P.E., Project Engineer Inspection Date: Quarterly Inspection May, 2008 Ponds: The east and west sedimentation ponds and their embankmeftdlets` appear in good condition. The west pond is shown in photograph 1 and the east pond in figure 2. Both ponds should be routinely cleared of sediment deposition. The outlet works are clean and operable. Figure 3 shows a cut in the entrance road embankment that is holding water and if it should fail would release sediment onto the adjoining pasture. It is not clear what purpose this serves. Drainage Ditches: The area has received recent rains as evidenced by the wet conditions at the mine. The east side and west side drainage channels appear in good general condition. The ditch on the east side of the top of the waste pile is in good shape. The upper yard is shown in photo 4. Drainage in these areas is working well. All other ditches and drainage structures were inspected and appear in good operating condition. There are no apparent drainage problems on the site.. All drainage features have been constructed and are operating as stated in the drainage plan submitted to the Division of Minerals and Geology. Coal Waste Pile: There are no visible signs of structural instability on the waste pile. Since the last inspection the upper slope of the waste pile face has apparently been reconfigured to reflect final reclamation grading. It has been graded with evenly spaced pockets as shown in figure 5. The top of the waste pile is in good condition. It is important that any further fill be placed in lifts not to exceed 12° and that compaction results in the density stated in the design report. Photo 6 shows the top of the pile. Except for the items mentioned above the fill on the waste pile has been constructed as specified in the design approved by the Division of Minerals and Geology.