263—8.4 (368) Preliminary notice and public meeting. A petitioner initiating an involuntary city development proceeding shall comply with the applicable notice, publication, and public meeting requirements contained in Iowa Code section 368.11. For purposes of calculating the required period of notice, “business days” shall include Monday through Friday of each week, excluding “legal holidays” as set forth in Iowa Code section 4.1(34). Proof of substantial compliance with these requirements, including copies of certified mail receipts, certification of publication of notice of the meeting, minutes of the public meeting and copies of the documents received at the meeting, shall accompany each petition for involuntary city development action filed with the board.