All City departments and offices shall file with the Purchasing Agent detailed requisitions or written estimates of their requirements for supplies, equipment, and services, in such manner, and at such times, as the Purchasing Agent shall prescribe. The Purchasing Agent shall examine each requisition or estimate and shall have the authority to revise it as to quantity, quality, or estimated cost; provided, however, that a change in quality will not vary substantially from the standards of the using department or office; and provided further, that the using department head, or designee, is first consulted. (Ord. 3400 § 1, 2017; Ord. 2899 § 1, 2003; Ord. 2766 § 1, 1998).