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' 3) P <br />li <br />i <br />l <br />i <br />di <br />h <br />hi <br />h <br />b <br />k <br /> re <br />m <br />nary ana <br />yses <br />at very <br />n <br />cate t <br />g <br />em <br />an <br />ments <br /> (greater than 300 feet) will probably be adequately stable <br />' at slope angles of 30 degrees, however, detailed analyses <br /> of these embankments are recommended for final design purposes. <br /> 4) Toes of waste dumps located adjacent to pit slopes should be <br /> at least 135 feet and 240 feet from the top edge of the pit <br />t slope for mining to the "F" seam, and "J" seam, respectively. <br /> 5) Stability analyses indicate that the dragline can safely <br />t operate on the top of the spoil bank, without danger of a <br /> catastrophic slope or bearing capacity failure providing that <br /> the dragline is positioned a minimum of 5 feet from the edge <br />' of the crest of the spoil bank slope. <br />6) From a stability paint of view, no minimum berm width is required <br />' for safe dragline operation, other than to meet tiie criteria <br />stated in 5), above. <br />t 7) All berms and crests above slopes, especially those to support <br />draglines, should be kept drained, as required, to prevent <br />' ponding of water during periods of heavy rainfall. <br />' F. LIMITATIONS <br />' Soil deposits and foundation materials may vary in type, strength, and <br />' many other important properties between borings, trenches, and other <br />points of examination and the constructed embankment will be signiciantly <br />influenced by these site conditions. The conclusions and recommendations <br />' presented in this report are professional opinions prepared in accordance <br />with generally accepted engineering principles and practices. This <br />' warranty is in lieu of all other warranties either express or implied. <br />' W. A. Wahler and Associates is responsible for the conclusions and opinions <br />contained in this report based on the data relating only to the specific <br />' aspects of the project and site location as discussed herein. In the <br />event conclusions or recommendations based on these data are made by others, <br />' such conclusions or recommendations are not the responsibility of W. A. <br />Wahler and Associates unless W. A. Wahler and Associates has been given <br />an opportunity to review and concurs in such conclusions or recommendations <br />' in writing. <br />WR.WRHLEfl Project 0823 I-4 <br />& RSSOCUli6 <br />