In all matters wherein the City Solicitor, by reason of having acted
as counsel or attorney for clients, having interests adverse to the interest
of the city prior to his appointment as City Solicitor or by reason of personal
relationship or otherwise, considers himself disqualified to represent the
city's interest in a particular matter, he shall so notify an assistant
City Solicitor who shall thereupon assume and perform all of the duties of
the City Solicitor in connection with such matter.