For the following retaining wall find the factor of safety a. Against overturning b. Against sliding Wall dimensions: H=6 M, X1=0.35 m, x2= 0.5 m, x3=2 m, x4= 3m, x5= 1.1 m D= 1 m, alpha=20 deg. Soil properties: Gamal 17 kN/m, Phil= 35deg, Gama2=18 kN/m, Phi2= 16 kN/m, c2= 20 kN/m. The backfill is sand. kl-k2-0.5 DE H Design the foundation shown below to support the following two columns with uniform contact pressure: Columns Col. Dimensions CI 0.50 m x 0.50 m C2 0.50 m x 0.50 m Assume the net effective allowable soil pressure is 180 kN/m C0.5m DL (kN) 400 850 5m LL (KN) 350 420