Off-street loading berths in addition to those prescribed in the schedule of off-street loading berth requirements shall be provided if the Site Plan Review Committee finds that such additional berths are necessary to ensure that the trucks will not be loaded, unloaded, or stored on public streets. The finding of the Committee shall be based on an investigation of the anticipated frequency of truck pick-ups and deliveries and of the truck storage requirements of the use for which the off-street loading berths are required.