A 3 m thick clay layer (c u = 60 kN/m 2 and = 19.0 kN/m 3 ) is underlain by a weaker clay

A 3 m thick clay layer (c_u = 60 kN/m² and γ = 19.0 kN/m³) is underlain by a weaker clay (c_u = 30 kN/m² and γ = 18.0 kN/m³) to a large depth. A 2.0 m wide square foundation is placed at 1.5 m depth below the ground level. Determine the maximum column load that can be allowed on the foundation with FS = 3.