Borough Council may from time to time amend, supplement, change, modify or repeal this Part 1, including the Zoning Map. No such amendment, supplement, change, modification or repeal shall become effective until after a public hearing in relation thereto, at which parties in interest and citizens shall have an opportunity to be heard. Public notice shall be given not more than 30 days and not less than seven days in advance of said public hearing. Such notice shall be published once each week for two successive weeks in a newspaper of general circulation in Fox Chapel Borough. Such notice shall state the time and place of the hearing and the particular nature of the matter to be considered at the hearing. Notices of said hearing shall be mailed to every civic association or associations of residents in the Borough which shall have registered its name and address for this purpose with the Zoning Hearing Board. The notices shall state the time and place of such hearing and the general nature of the proposed amendment. In the case of an amendment other than one prepared by the Fox Chapel Planning Commission, Borough Council shall submit each such amendment to said Planning Commission at least 30 days prior to the hearing on such proposed amendment, to provide the Planning Commission an opportunity to submit recommendations. At the option of the Planning Commission, the Planning Commission may defer the making of a recommendation to the Borough Council until after a public hearing has been conducted by Borough Council. If the Planning Commission has deferred making a recommendation, then after a public hearing has been conducted by Borough Council the Planning Commission shall make its recommendations to the Borough Council.