Where a collapsing subsoil is suspected at the building (as where loose fine sands or soft damp silty sands, of altered Aeolian origin or from the decomposition of certain granites, are present in the subsoil), the local authority-

a) may require a report to be submitted with the building plans, specifying and justifying the measures proposed to be taken to make provision for the possible differential settlements which may occur in the building; and

b) shall have the power to enforce these proposed measures in full or in part