The Planning Board may consider requests for waivers from the design standards in Article 5 of these Regulations, subject to § 307 of the Zoning Ordinance and Section 908 of these Regulations, if the standard or standards to be waived are neither specifically referenced as a requirement by, nor substantially similar to a requirement in, the Zoning Ordinance. For all waiver requests the Planning Board shall hold a public hearing preceded by notice consistent with the requirements of Zoning Ordinance, § 320(A).