Section 40 Notice to owner of vessel causing obstruction
Section 40. If any person in the United States is known to the department as the owner of such vessel or of any interest therein, or as having or exercising any control over it as master, agent, insurer or otherwise, or as having alone or with others built, deposited or caused any other unlawful obstruction, or as owning, maintaining or using the same in whole or in part, the department shall give him written notice to remove such vessel or other obstruction within a time therein specified. Such notice shall be deemed a sufficient notice to all such owners and other persons if served on one or more of them by the department, or by its order, by delivering the same in hand, by leaving it at the usual place of business or abode or duly mailing it to the post office address of the owner or other person upon whom it is to be served.