Thus, assuming that the critical level for a single berth container terminal is about 60,000 containers a year, the ceiling for a multipurpose terminal could be about 40,000 containers. For other types of cargo the range is wider. In the case of forest products the critical point for a specialized terminal may be about half a million tons a year, but a multipurpose terminal could successfully handle a substantially smaller volume. 16. Paragraph 14 mentions two general categories of cargo, unitized cargoes of one sort or another and cargoes currently considered as semi-bulk. A question that must be considered is whether a multipurpose terminal should handle bulk cargo. In principle, it would seem reasonable to exclude bulk cargo involving such operations as: Direct transfer of cargo from the ship to land vehicles using chutes or moving belts; Direct transfer from the ship to quayside storage; Transfer from the ship using fixed overhead belts. These and similar operations are inconsistent with the philosophy and efficiency of a multipurpose terminal. This does not apply to bulk liquid or semi-liquid goods such as bulk concrete, subject to the requirements that: The consignments are small and a minor part of the total operation; Shipments are regular, not occasional; Transfer is effected through underground, watertight pipes; Storage facilities are well away from the berths and do not interfere with other storage areas. The objective of these conditions is to earn a marginal profit without interfering with the general efficiency of the terminal. 17. The expected growth of traffic in a multipurpose terminal has an important bearing on the fundamental objective of its design. In this connection there are two possibilities: The terminal may be intended eventually to become a specialized terminal, for which the volume of traffic needed for efficiency will not be available for some years. This would be the case in a port where container traffic is still on a small scale; The terminal may be intended to handle a number of specific trades with a balance between those trades and container traffic. This would be the case in a port with an established container trade at specialized terminals but where marginal traffic cannot be efficiently handled because of such factors as the type of ships, the schedule of arrivals and the size of cargoes.