When in the prosecution of any work or improvement under contract it becomes necessary, in the opinion of the director of the appropriate department, to make alterations or modifications in such contracts, such alterations or modifications shall be made only when authorized by the Council upon the written recommendations of such director, countersigned by the Mayor. No such alterations shall be valid unless the price to be paid for the work or material, or both, under the altered or modified contract, shall have been agreed upon in writing and signed by the contractor and such director prior to such authorization by the Council.
(Effective November 9, 1931)