as a method to gain shipping information or delivery status as required by the urgency of the individual purchase order. (5) Prorated Delivery or Shipment a. Schedules may be formulated as required by the retardment or accelleration of the work program. a--Notification shall be made to suppliers to withhold shipments until further notified (to conform with vessel sailings). (6) - Continuous delinquency by the supplier on delivery schedules shall be referred to the Purchasing Agent for action. a. Supplier will be requested to show cause. b. Suspension of the vendor from the "competitive list of suppliers" shall be made at the direction of the Procurement Director. c. Non-performance of delivery promise by vendor will be just cause for order cancellation. a--Cancellation of orders shall be made by the Purchasing Agent. (7) Changes in Routings a. Changes in routings shall be effected whenever necessary to conform with air or water departure schedules. a--Routing changes to higher classified routings, (i.e. air express, railway express), shall be for the. account of the buyer, unless previously acknowledged by the seller in written letter copy. b--Payment of charges for higher classified tariff routings shall be made in accordance with established federal tariffs and commodity rate classifications. c--Changes in routings shall be accomplished by formal purchase order revision. 13-52