All public corporations or persons having buildings, structures, works, conduits, mains, pipes, tracks, or other physical obstructions in, over, or upon the public streets, lanes, alleys, or highways, which interfere with or impede the progress of construction, maintenance, or repair of the works of a sanitary district shall upon reasonable notice from the board of directors of the sanitary district promptly shift, adjust, accommodate, or remove such obstructions so as to fully meet the exigencies occasioning such action. Upon failure of any public corporation or person to make such changes the board may do so. Unless otherwise mutually agreed to, the cost and expense of such changes shall be met by the district.