Automobile dismantling yards, wrecking yards, junk and salvage yards, impound yards and pallet yards; provided, however, any such uses lawfully commenced and still in existence on May 4, 1978, may lawfully continue and be expanded if the property upon which such use is conducted is improved in accordance with the provisions of subsection
30-20.6 of this Chapter. The expansion of any existing automobile dismantling yard, wrecking yard, junk and salvage yard, impound yard or pallet yard shall require a conditional use permit in accordance with Section
30-26 of this Chapter.