The Sanitary Board, as it is now established, shall be continued in effect, insofar as it complies with the provisions of general law; provided, however, that the Sanitary Board shall be composed of the Mayor, who shall be the Chairman of the Board, and two other persons appointed by the Council, one of whom shall be a registered professional engineer. Such Sanitary Board, so composed, shall continue in existence and operation only until such time as Council performs the duty required of it by Section 10.104 of this article.