of these Special Conditions. In case where there is a difference of opinion between the Supervisor, quantity surveyor and the contractor, as to the value of an item, the Supervisor’s view will prevail. The Supervisor may make any corrections or modifications to any previous certificate issued by him and shall have power to modify the valuation in, or withhold the issue of any interim payment certificate if the works or any part thereof are not being carried out to his satisfaction. Article 50:
