As used in this chapter, the following terms shall have the meanings indicated:
Removing surface encumbrances from a land area, including but not limited to trees, logs, stumps, brush, stones, vegetation and earth.
Removal of material, regardless of its nature, from below the existing ground surface.
Leveling, sloping, raising, lowering or otherwise changing the existing surface of land area.
The removal of root systems incident to surface growths of trees and vegetation.
The stripping of vegetation and/or topsoil, or surface grading which changes the existing natural slope by 5% or more, excavation, filling, mining, and/or any other activity causing the addition and/or displacement of soils by mechanical means.
Any movement of earth by a motorized device of any kind; except that "motorized device" shall not include devices such as garden or lawn tractors, post hole diggers, and similar devices which have as their primary purpose residential use.