Trash containers shall be screened according to the following minimum standards:
(a) Trash containers designed to service more than one (1) residential unit or to service a non-residential structure shall be screened on three (3) sides by walls, fences, or natural vegetation or an acceptable combination of these elements.
(b) The height of such screening shall be at least six feet (6 ft.). The maximum height of walls and fences shall not exceed ten feet (10 ft.). Vegetation shall have a minimum opaqueness of seventy-five percent (75%) at all times within two (2) years of planting. The use of evergreen vegetation is encouraged. Vegetation shall be a variety and size that will attain six feet (6 ft.) in height within two (2) years of planting.