An amendment to an application prior to a certification action being taken shall be submitted in the same manner as the original application and shall be considered a part of the application it amends. No additional fee shall be required for an amendment to an application prior to a certification action unless the activity's size, design, scope, or potential for adverse impact has changed significantly, prompting the need for further technical or administrative review or otherwise triggering a larger fee as required pursuant to Section 3833 of this Chapter.