If ambiguity arises concerning the appropriate classification of a particular use within the meaning and intent of this Title, or with respect to matters of height, yard requirements, area requirements, or zone boundaries, as set forth herein, and as they may pertain to unforeseen circumstances, including technological changes and processing of materials, it shall be the duty of the Planning Commission to ascertain all pertinent facts and set forth its findings and its interpretations, and thereafter such findings and interpretations shall govern.