HYDRO28308 - Laserfiche WebLink

Home Browse Search

showing the slopes is attached to this report. An attempt should be made to accurately shape the pile face at a 2:5:1 slope. The design for the finished top of the pile Calls for a cross slope from north to south of 2% and a longitudinal Slope (along the length of the pile) of 1% from the back toward the front face. The surveyed cross and longitudinal slopes were approximately 0.8%.and 3.7% respectively. Durjng construction of the pile the slopes should be maintained as close as possible to the final design slopes. 'This will facilitate proper drainage without erosion. The length of the pile at the toe of the slope is less than that shown on the design plans. Although this does not affect the integrity of the pile it does mean that the volume will be less at the specified design elevation however there is plenty of room in the valley to extend upward to compensate for this volume. The need for truck maneuvering room at the bottom is evidenced in photo 5 and it is recommended that no adjustment be made. The temporary access road up the pile face can be seen in photograph 6. A ditch should be cut on either side of this road. The waste pile design ells for a fill density of 90% of the maximum dry density. Geotechnical tests were pertormed the week pf this inspection to determine the density of the placed fill and establish baseline conditipns for on joing density measurements. The results were not available at the time of submittal of this inspection report. The reclamation plan calls for a underdrain beneath the waste pile. The existing underdrain will be connected to a new drain that will extend up valley to the top of the pile. King Coal should locate the end of the existing drain and make plans for the construction of the connecting structure with the new drain as per the reclamation plan. As the pile moves upward all vegetation should be removed from cleared land prior to earthwork on the pile. Some vegetation was observed in the fill used to form the ditch on the north side 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.