In the case of any leak, explosion or other accident in any subsurface pipe, line, construction or apparatus, it shall be lawful for the person owning or responsible for such pipe, line, construction or apparatus to commence an excavation to remedy such condition before securing a permit; provided, that application for a permit shall be made immediately and not later than the next business day thereafter, and that all other provisions of this Part are fully complied with. If any such emergency condition shall not be immediately attended to by the owner or person responsible for such pipe, line, construction or apparatus, the designated official, after such notice as he or she shall deem necessary under the circumstances of the particular case, shall proceed to do the work necessary and required by such emergency and charge the same on the basis of cost plus 20% to such owner or person.
(A.O.)