9 Refer to Figure 18.23. Given L = 3 m, L2 = 6 m, l =1.5 m, y = 16.5 kN/m³, y sat =19.0 kN/m, and o' = 35° a.

Find the required depth of the sheet pile, increasing the theoretical estimate by 30%. b. Determine the force in the tie rods if they are spaced 3 mapart horizontally. c. Find the maximum bending moment in the sheet pile.