(A) The Harbormaster may 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 vessels which are in a dangerous condition for lack of pumping, or move any vessel occupying any mooring space for the purpose of protecting such vessel or other property from fire or other hazard. Whenever the Harbormaster performs any of the acts herein above authorized, after having given the best possible notice under the circumstances to the vessel operator of the immediate need therefor, the vessel operator shall pay the city the appropriate fee as prescribed by ordinance.
(B) The city shall hold and retain a lien, maritime or otherwise, against a vessel that is liable to the city for Harbormaster service fees assessed under subsection (A) of this section to the extent such lien is allowed by applicable federal and state law. The city may, at its option, enforce and foreclose such lien by suit in rem pursuant to applicable federal and state law. Such suit shall not preclude the city from pursuing any other remedy at law or in equity.