...pressures directly under individual footings, walls, and piers. When structures are founded on or are underlain by deposits of these classes, the total...major portion of the structure, minus the weight of excavated material, divided by the area, shall not exceed one-half the tabulated bearing values. (f)...

...multiplied by the least lateral dimension in feet (meters) . Clays: The tabulated values for clay material apply only to pressures directly under individual...excavated material, divided by the area, should not exceed one-half of the appropriate tabulated bearing value. Underlaying stratum of smaller bearing value:...