Work shall be done at such time and in such manner as shall be consistent with the safety of the public and shall conform to all requirements and standards of the City. If at any time it shall be found by the City that the work is not being done, or has not been done as required, the permittee shall immediately take the necessary steps, at his own expense, to place the work in condition to conform to such requirements or standards. In case any dispute arises between the permittee and the City Inspector, the City Inspector shall have the authority to suspend work until the question at issue can be referred to and be decided by the Director of Public Works.