Upon notice from the Director of Public Works, immediate repairs shall be made by the permittee of any injury or damage in any portion of a public place which occurs as a result of the work done, and which, in the opinion of the Director of Public Works, constitutes a public hazard. In the event such repairs are not made within twenty-four hours after notice, the Director of Public Works is authorized to make such repairs and charge all costs plus overhead to the permittee.