(a)        For any building containing a school for children below grade 7, off-street loading facilities shall be provided in accordance with the requirements of this Section. Such off-street loading facilities shall be so situated and arranged to provide head-in and head-out movement of vehicles on two separate streets, and shall have a minimum dimension of 12 feet. All such off-street loading facilities shall be screened from adjacent zoning lots by a four foot buffer of shrubbery that is at least four feet high at the time of planting.

(b)        For other schools with no children below grade 7, an off-street loading facility shall be provided with a minimum dimension of 12 by 18 feet.