A square shallow foundation is located at depth of 1 m, in stronger sand. A softer sand layer is located at a depth of 3 m measured below the ground surface. H = 5.0 m and Ks = 4.0. Find B to carry the 4000 kN load using a factor of safety FS = 3. Assume that the bearing capacity of the top layer exceeds the ultimate bearing capacity. %3D Notes: 7.567 For the top sand layer, unit weight = 14 kN/m'; 6' = 30. For the bottom sand layer, unit weight 11 kN/m2; '= 22. %3D