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January 15. 2008 <br />FLAG (Version 5.00) <br />¦ <br />¦ <br />¦ <br />Page 3 <br />Figure 19. Contours of Velocity at Equilibrium for 1.31-1:1 V Slope Angle and 30-ft-high <br />Pile Under Saturated Residual Strength Condition for Q-Floor Mudstone <br />Bedding Dipping at 25° (Note: velocities less than H fps arc considered <br />negligible and in equilibrium) <br />4.5 Spoil Pile Recommendations <br />It is recommended that spoil pile be constructed so as not to exceed a maximum fill <br />height of 68 ft above the toe and that the spoil pile slope face not exceed a 1.3 horizontal-to- <br />vertical ratio in areas where the average bedding slope is about 13°. This recommendation is <br />thought to be conservative. especially during dry periods. because a low strength for the Q-Floor <br />mudstone was assumed and no cohesion was assumed for the spoils. <br />'T'here are uncertainties in this analysis that need to be considered when implementing <br />these design recommendations, especially regarding bedding dip compared to bedding strength. <br />and groundwater effects. The analysis assumed the strength of the Q-Floor bedding was 01 = 15° <br />softening to 5° at residual. The 13° bedding dip represents an average, but there are locations <br />within K-111t where the beds are more steeply dipping (up to 15°). If the beds dip more steeply <br />than the frictional strength of the beds then the spoils will be unstable, creeping or sliding down <br />hill. In such areas. there are two design alternatives: <br />Associates. Inc.