Definitions. As used in this section, the following terms shall have the meanings indicated:
CLEARINGRemoving surface encumbrances from a land area, including but not limited to trees, logs, stumps, brush, stones, vegetation and earth.
EXCAVATIONRemoval of material, regardless of its nature, from below the existing ground surface.
GRADINGLeveling, sloping, raising, lowering or otherwise changing the existing surface of land area.
GRUBBINGThe removal of root systems incident to surface growths of trees and vegetation.
LAND CONTOUR WORK(1) Clearing, grubbing, grading, or excavating vacant lots and other land areas.
(2) Exemption: Does not include minor work which does not change surface drainage patterns.
LAND DISTURBANCEThe stripping of vegetation and/or top soil, or surface grading which changes the existing natural slope by 5% or more, excavation, filling, mining, and/or any other activity causing the additional and/or displacement of soils by mechanical means.
MECHANICAL MEANSAny 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.