A. A formal written contract, signed by the mayor and attested by the finance director, shall be required as follows:

B. In cases of purchases of supplies, material or equipment, a purchase order shall be sufficient to document the transaction.

C. In all other cases, a document (on a form acceptable to the city) representing the terms of agreement between the contractor or vendor and the city shall be executed by the contractor or vendor and the head of the department for whom the work is being performed. The mayor and finance director are hereby authorized to delegate to such department head authority to sign such document. Such document shall be accompanied by an insurance certificate naming the city as an additional insured. [Ord. 2009-09-058; Ord. 2004-07-048; Ord. 1998-04-016; Ord. 9878, 1988; Ord. 8884 § 10, 1980].