2-1-6: CHANGE ORDERS:
   A.   Issuance For Change Order: The purchasing agent shall issue a change order upon approval by the city council, at any time the scope of the contract changes.
   B.   Claim Covered By Contract: No payment shall be made for any claim from a contractor unless that claim is covered by the basic contract or a written change order signed by the purchasing agent and approved by the city council. (1987 Code § 7-107)