Before voting on the enactment of an amendment, the Board of Commissioners shall hold a public hearing thereon, pursuant to public notice. In the case of an amendment other than that prepared by the Planning Commission, the Board of Commissioners shall submit each such amendment to the Planning Commission at least 30 days prior to the hearing on such proposed amendment to provide the Planning Commission an opportunity to submit recommendations. If, after any public hearing held upon an amendment, the proposed amendment is changed substantially or is revised to include land previously not affected by it, the Board of Commissioners shall hold another public hearing, pursuant to public notice, before proceeding to vote on the amendment. The Township shall submit the proposed amendment to the Delaware County Planning Department at least 30 days prior to the public hearing on the amendment. Within 30 days after enactment, a copy of the amendment to the Zoning Ordinance shall be forwarded to the County Planning Department.