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• <br />Shallow surface failures need not produce an un- <br />acceptable hazard to the operations and facilities located <br />on fire crushing and screening level bench. If they occur, <br />they would have to be treated inunediately to prevent their <br />progressive growth. Si^nificant water pressures within the <br />fill would contribute to such progressive growth. <br />The analyses have shown that safety factors against <br />a deep seated failure are reasonable assuming again that <br />the fill is dry. A deep seated failure might slowly develop <br />in the fill if excessive deformations (combined settlement <br />and lateral deformations) would cause signficant development <br />of fractures within the fill mass; partial or total satu- <br />ration could then cause a large failure. <br />It is our opinion that some additional precautions <br />• <br /> <br />should be undertaken as soon as possible to insure the integ- <br />rity of this fill during the operating life of the mine <br />facilities. We consider that either of the following two ap- <br />proaches would be reasonable. <br />The safety factor of the fill could be increased to an <br />acceptable level by changing its existing configuration. This <br />could be achieved by either flattening the angle of the fill <br />to a uniform lo•.aer angle or by constructiong a buttress at the <br />toe of the fill. 'The calculated safety factors for various <br />alternate configurations are presented in Appendix C. If it <br />is decided to adopt this approach, t11e slope configuration <br />should be chosen to provide a satisfactorv safety factor <br />based on the cost and practicality of the various alter- <br />natives presented.Somc form of vround water monitoring should <br />also be included as part of this solution to insure that <br />ground water conditions assumed in analyzing the stability <br />of tho rill are met. <br />1~ <br />GEONVDRO CONSULIING.INC. <br />