Procedure. Applicants shall submit five copies of the site plan to the Planning Board for review, and within three days thereafter shall also submit a copy of the site plan to the Board, Board of Health, Building Inspector, and Conservation Commission for their advisory review and comments. The Planning Board shall hold a public hearing on any complete application within 60 days of its submission. Public notice of said hearing shall be given in accordance with the requirements of MGL c. 40A, § 11. The Planning Board shall review and act upon the site plan, with such conditions as may be deemed appropriate, within 60 days of the closing of the public hearing, and notify the applicant of its decision. The decision of the Planning Board shall be upon a majority of the Planning Board, shall be in writing, and shall be filed with the Town Clerk within 14 days thereafter. No building permit or certificate of occupancy shall be issued by the Building Inspector without the written approval of the site plan by the Planning Board, or unless 60 days lapse from the closing of the public hearing without action by the Planning Board. All time limits may be extended in writing by mutual agreement of the applicant and the Planning Board.