For all uses that include areas used for service, loading, and unloading activities, such areas shall be screened along the entire rear lot line and side lot lines from the rear lot line to the rear building line to the following minimum standards:
(a) The width of the screening area shall be a minimum of five feet (5 ft.). Screening shall consist of walls, hedges, fences, vegetation, or an acceptable combination of these elements, provided that screening must be at least seven feet (7 ft.) in height.
(b) Vegetation used for screening shall have a minimum capacity of seventy-five percent (75%) at all times within two (2) years of planting.