Any purchase of or contract for supplies, materials, labor, services, or equipment shall be made in accordance with the provisions of the general laws of Ohio, including those relating to competitive bidding, to the extent not inconsistent with this Charter and ordinances of the Council. Any dollar amount limit, provided by the general laws of Ohio, below which competitive bidding is not required shall govern unless another and differing limit is provided by ordinances of the Council. The Board of Control shall have the power to reject all bids and re-advertise. Alterations in any contract may be made, when authorized by the Board of Control, in accordance with the procedure established by the general laws of Ohio.