Notwithstanding the provisions of Subsection A hereof, pertaining to the required depth of a buffer zone, upon an application for development of a particular property as a planned residential development, the Planning Board may increase the required buffer zone to a maximum depth of 100 feet, upon the Board's specific findings of particular circumstances relating to conditions of topography, natural features, lot configuration, natural vegetation or the lack thereof, soil conditions, drainage or other related site characteristics, or where such proposed planned residential development is incompatible with existing adjacent development.