(2) Each item of the breakdown esti- (3) The Contracting Officer or his author- mate shall include all overhead, profit and other costs pertaining thereto; such costs are not to be itemized or priced separately. ized representative shall have the right to revise the breakdown estimate submitted as in his judgment may be required to make the several items included in the detailed estimate conform to their true value. e. Purchase Orders - The Contractor shall furnish the Contracting Officer with copies of all purchase orders for equipment and materials to be incorporated in the permanent construction. Each purchase order shall indicate clearly the promised date (3) of shipment, point (s) of shipment, articles to be furnished, and unit prices. Shipping times specified on purchase orders such as, “soon as possible," “at once," "immediately" and "rush," will not be acceptable to the Contracting Officer. In the event that any delivery shown is not acceptable to the Contracting Officer, the Contractor will be required to take immediate steps to obtain the articles from a source offering suitable delivery. f. Equipment and Operating Systems ~ At the re- quest of the Contracting Officer, the Contractor will pro- vide information relative to description and costs of equipment and operating systems furnished and/or installed under this contract. IV-3 PAYMENTS - Payments will be made as provided in Article VI of the contract. Unless otherwise authorized in writing by the Contracting Officer the items of work for which payments will be made shall be limited to those listed and enumerated in the contract. Iv-4 SUBCONTRACTORS - The Contractor shall not sub- contract any of the work he is obligated to perform under this contract except as authorized in writing by the Commission. The Contractor will provide the Contracting Officer, in writing with names of all subcontractors authorized for the work, together with the extent and character of the work to be done by each subcontractor. The Contractor or subcontractor shall, within seven (7) days after the executing of any subcontract, deliver to the Contracting Officer an affidavit setting forth the name and address of his subcontractor and a summary description of the precise work subcontracted. GC-11 If, for sufficient reason,