If the Treasurer finds or reasonably believes that any person who is or may be liable for taxes upon personal property, the taxable situs of which was in the City on tax day, intends to depart or has departed from the City; or to remove or has removed therefrom personal property which is or may be liable for taxation; or to conceal or conceals himself or his property; or does any other act tending to prejudice, or to render wholly or partly ineffectual the proceedings to collect such tax, he shall proceed to collect the same as a jeopardy assessment in the manner provided by law.