Uses Permitted by Approval of Special Exception. A single principal building, together with customary accessory structures, may be erected, altered, or used, and a lot may be used or occupied, for any of the following principal uses, together with permitted accessory uses, where approved by the Zoning Hearing Board as a special exception pursuant to Part 18:
A. Any use permitted by approval of a special exception in the MD District.
D. Public swimming pool except municipal uses.