Be it further enacted, That the city purchasing agent shall have the following powers and duties:
(a) To make purchases and contracts as provided in this Act and by ordinance not inconsistent with this Act.
(b) To establish, with the approval of the city manager and after consultation with departments and agencies concerned, and to enforce standard specifications for supplies, materials, and equipment.
(c) To prescribe, with the approval of the city manager, the times of making requisitions for materials, supplies, and equipment and the future periods which such requisitions are to cover.
(d) To inspect or cause to be inspected supplies, materials and equipment when delivered, and to cause tests to be made when necessary in order to determine their quality, quantity, and conformance with specifications.
(e) To supervise and control any central storerooms and warehouses that may be established.
(f) To transfer to or between departments and agencies and to sell or trade in any supplies, materials, or equipment determined by him, with the approval of the city manager and after consultation with the using agency concerned, to be surplus, obsolete, or unused, subject to the provisions of Section 4.23 of this article.
(g) To maintain an adequate system of records for supplies, materials, and equipment purchased and issued.
(h) To maintain such an inventory of city property as may be required by the city manager.
(i) To perform such other duties as may be required by the council or by the city manager.