A grading permit is not required for:
A. Excavation and grading in association with a building permit;
B. Excavations required for installation of public improvements;
C. Excavations for the study of soil and groundwater conditions;
D. Landscape installation which does not result in a fill more than one foot in depth placed on natural terrain with a gradient less than twenty percent or an earth berm not more than four feet in height and which does not exceed fifty cubic yards on any one lot; or
E. Excavations, grading or filling when required as a condition of a preliminary plat, short plat, or binding site plan.