A continuous foundation having a width of 1.5 m is placed at 1.0 m depth within a loose sand deposit where ' = 32° and y = 17.0 kN/m³. This sand is underlain by a thick dense sand deposit (+' = 40° and y = 18.0 kN/m³) at 2.5 m depth below the ground level. Determine the ultimate bearing capacity of the foundation.