delivery due to special design or fabrication. (>) - Items of special design should be ascertained in sufficient time to provide adequate delivery time to conform with construction schedules. Field material requistion files shall be maintained and referenced. Close contact shall be maintained with field units regarding the quality and performance of materials and equipment utilized in the scope of work. Engineering Design Group shall ascertain minimum and maximum quantities of material and equipment to be used for field test and experimental purposes. C. PURCHASING DEPARTMENT - MATERIAL CONTROL lL. The Purchasing Department shall initiate all necessary action to effect delivery of materials and supplies to conform with field use schedules and requirements. (a) 13-50 This shall include premium payments for advance delivery and/ - or priority manufacture. (b) - The securing of any necessary technical data from manufacturers without delay.