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face. The pseudostatic factors of safety were 1.4 on the <br />• upstream face and 1.1 on the downstream face. these values <br />exceed the U.S. Army Corp of Engineers acceptable standards. <br />D.6.8.6 Settlement <br />The settlement of the embankment will be controlled by <br />the characteristics of the embankment and foundation materials. <br />Blow counts from the geotechnical field exploration program <br />indicate that the underlying alluvium can be classified as a <br />dense to very dense soil material. The foundation is <br />anticipated to behave as a relatively dense material resulting <br />in negligible settlement due to the expected load imposed by <br />the embankment. It is reasonable to assume that a majority of <br />the settlement would be elastic and would likely occur as <br />construction proceeds and should not create any apparent <br />surface expressions. Therefore, settlement leading to a <br />reduction in embankment height or an uneven crest elevation <br />• is not anticipated. <br />In addition, the embankment is to be constructed on a <br />natural ground slope of approximately three percent and as <br />settlement occurs, the underdrain piping network will still <br />possess a positive gradient to allow the solutions to drain. <br />Specifications of the proposed liner material indicate <br />that the liner is capable of withstanding a percent change in <br />elongation of approximately 1,000 percent. Relatively <br />consistent density exists within the foundation materials and <br />settlement is predicted to be uniformly distributed across the <br />foundation. Therefore, differential settlement .sufficient to <br />rupture the synthetic membrane is not anticipated. <br />D.1 Water Balance <br />The tailings disposal area water balance has been evaluated <br />for average anticipated operating conditions with consideration of <br />D-72 <br />