HYDRO27135 - Laserfiche WebLink

Home Browse Search

INSPECTION REPORT Site: National King Coal Mine, Hesperus, Colorado Inspected By: Don R. May, P.E., Project Engineer Inspection Date: Quarterly Inspection June, 2007 Ponds: Photograph 1 shows the west pond and photo 2 the east pond. Both appear to operating properly. The inlets, outlets and embankments of both ponds were inspected and appear in good condition. The east pond is due for Leaning this year. Drainaoe Ditches: Photograph 3 shows the drainage ditch adjacent to the waste pile. The ditch intercepts runoff that comes off the(pile as well as the hillside. It is important that the gradient of the ditch slopes toward. the mine yard (away from the cart). Some low spots Head to be repaired. All other drainage channels on the site were inspected and are in good condition. Routine maintenance should be carried out to ensure that the entrances to all pipes are free of debris. Soma coal contaminated runoff appears to be entering the clear water ditch on the north side of the top of the waste pile. Photo 4 shows this area. As fill is added to the pile the access road needs to be graded to keep runoff from the pile and road from entering this ditch. Drainage in and around the upper and lower yards is working well and both are in good shape. Photograph 5 shows the ditch behind the office. Except where noted, 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: The upper portion of the waste pile (above the road) appears stable and in good condition. Care should be taken keep this surface relative uniform an sloping to the drainage ditch. AS mentioned in previous reports, the blocks placed at the toe of the water pile have improved slope stability. A continuation of the blocks around the curve towards the photographer would help remediate the oversteepened section seen in the photo. The design slope of the face is 3:1. At some point the actual slope should be surveyed to confirm compliance. Ultimately another course of block may be needed. Except for the items mentioned above the fill on the waste pile has been constructed as speafied in the design approved by the Division of Minerals and Geology.