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SB-Slope generated the following result: <br />Tri County Standard Case <br />GRID SEARCH ANALYSIS <br />Approximately 50 slices selected <br />Xmin= -30.0 Xmax= 90.0 Increment= 5.0 <br />Ymin= 100.0 Ymax= 170.0 Increment= 5.0 <br />Rmin= 0.0 Rmax= 60.0 Increment= 4.0 <br />Minimum FS found during grid pattern = 1.94 <br />Found at X= 5.0, Y= 100.0, R= 12.0 <br />Failure circles were generated at points near the above circle at less then 5 ft away to confirm <br />that the above FS is the minimum. As demonstrated by Bishop's method of slices, the dike has a <br />factor of safety along the river of approximately 2.0. This is well above the minimum factor of <br />safety of 1.3, thus showing the slope is stable. The minimum FS failure circle is shown on <br />Figure Cl in Appendix C. <br />An additional analysis of the dike was performed to confirm the stability of its slope under an <br />arbitrary worse case. For the purposes of this exercise, the density was reduced in all materials <br />by 25%, and the internal angle of friction was lower by 2°. The values used for this analysis are <br />shown in Table 2. This accounts for any failure to fully compact the material in the existing <br />repair area. <br />Table 2 - Reduced Quality Material Data <br />Name Reduced Density Reduced Internal Angle Cohesion (c,psf) <br /> c of Friction <br />Sandy Gravel Soils 97.5 32° 0 <br />Sandy Silt, Silty Sand, and <br />Clayey Sand Soils 90 26° 0 <br />Loose Sand and Silt Soils 78.75 23° 0 <br />Tri County Dike Slope Stability Jan 08 6