A square foundation, 4 ft by 4 ft, located on the surface of a soil mass, supports a column load of 96 kips. Determine the vertical stress resulting from the foundation loading at a point 6 ft below...

A square foundation, 4 ft by 4 ft, located on the surface of a soil mass, supports a column load of 96 kips. Determine the vertical stress resulting from the foundation loading at a point 6 ft below the ground surface for locations beneath the center of the footing and beneath the edge of the footing, assuming:

(a) Boussinesq conditions apply.

(b) Westergaard conditions apply