This part shall not apply to the following:

(1) Activities of the Department of Transportation incident to constructing, repairing, and maintaining a public road system in Georgia;

(2) Activities of the Department of Transportation and political subdivisions in maintaining existing drainage systems and ditches as long as such activities do not impact additional marshlands;

(3) Agencies of the United States charged by law with the responsibility of keeping the rivers and harbors of this state open for navigation, and agencies of this state charged by existing law with the responsibility of keeping the rivers and harbors of this state open for navigation including areas for utilization for spoilage designated by such agencies;

(4) Activities of public utility companies regulated by the Public Service Commission incident to constructing, erecting, repairing, and maintaining utility lines for the transmission of gas, electricity, or telephone messages;

(5) Activities of companies regulated by the Public Service Commission incident to constructing, erecting, repairing, and maintaining railroad lines and bridges;

(6) Activities of political subdivisions incident to constructing, repairing, and maintaining pipelines that have been approved by the department or appropriate authority for the transport of drinking water and sewage;

(7) The building of private docks on pilings, the walkways of which are above the marsh grass not obstructing tidal flow, by the owners of detached single-family residences located on high land adjoining such docks; or

(8) The reclamation of manmade boat slips as a part of any publicly funded construction project and ancillary development projects including, without limitation, hotels, restaurants, retail facilities, and recreational facilities, whether public or private, within any industrial areas continued in existence pursuant to Article XI, Section I, Paragraph IV, subparagraph (d) of the Constitution which are wholly contained on an island.