The Harbormaster is granted the power and authority to, from time to time, but without any obligation or duty to do so and without any obligation or liability on his part or that of the City for his failure to do so, replace defective mooring lines, pump boats which are in a dangerous condition for lack of pumping and move any boat occupying any mooring space for the purpose of protecting such boat from fire or other hazard or for the protection of other boats therefrom. Whenever the Harbormaster performs any of the acts hereinabove authorized, after having given notice to the boat owner at the registered address of the immediate need therefor, or having attempted to give such notice, the boat owner thereof is required to pay the City the appropriate fee as prescribed by the City Council by resolution and such resolution having been posted at the Harbormaster’s office. [Code 1979 § 18.16.060.]