It shall be the duty of the City Manager to make investigations into the affairs of the City and all departments and divisions thereof, to investigate contracts to which the City is a party, and to investigate the performance of obligations of and to the City. (Ord. 80-3 § 1, 1980; Ord. 76-3 § 1, 1976; Ord. 83 NS § 7(j), 1955; prior code § 2-6(j).)