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"D" Seam Slope Staoility Page 23 October 19, 1998 <br /> Table 9. Ground surface slope angles along Section 7450, 1976 <br /> aerial topography. <br /> Segments Horizontal Elevation Elevation Inclination <br />• Horizontal Difference (ftl Difference (degrees) <br /> Coordinate (ft) (ft) <br /> 39700 6649 <br /> Crest <br /> 54 32 30.7° <br /> 39754 6617 <br /> 32 19 30.7° <br /> 39786 6598 <br /> 44 28 32.5° <br /> 39830 6570 <br /> 178 99 29.1° <br /> 40008 6471 <br />• 160 63 21.5° <br /> 40168 6408 <br /> 154 .~ 82 28.0° <br /> 40322 6326 <br /> 55 2 3.1° <br /> 40377 6324 <br /> - 44 24 21.2° <br /> 40421 6300 <br /> Toe <br />• <br />