The following parameters are given for a slope with steady-state seepage: Slope angle: 3H:1V, ø' = 24°, c' = 27 kN/m², y = 17.5 kN/m², H = 18 m, and r, = 0.25. Determine the factor of safety, F,, using a. Spencer's solution (Figure 15.35) b. Michalowski's solution (Figure 15.36)

End Area (ft2) Volume (yd®) Volume (yd) Net Volume (yd) Station Mass Shrinkage Total Cut Fill Cut Fill Cut Fill Diagram (12%) Fill Ordinate 0+00 400 3+00 600 152 5556 843 101 945 4611 4611 6+00 500 93 9+00 253 20 The mass ordinate at sta 6+00 is: 9.200 O 6,111 O 4,589 O -4,589

Write brief notes on the following: a, the technique of estimating mean depth and mean area; and b, technical sanction.

What is the purpose of sensors in perimeter and building security?