In Multi-Family, Commercial and Industrial Districts and for nonresidential conditional uses in residential districts, screening of accessory uses shall be provided according to the following:
(a) Waste receptacles and loading areas shall be screened by an opaque fence or wall or dense vegetative planting incorporating existing trees and/or shrubs or new plantings of a variety, which shall be equally effective in winter and summer.
(b) Permitted accessory outdoor storage of goods, supplies, equipment or vehicles used in the operation of an establishment, where permitted, shall be enclosed with a solid fence or wall, including solid gates. The wall or fence shall have a height tall enough to conceal all operations and materials therein from the view of any observer standing at the grade level of an abutting residential district line or a public street.
(c) Selected screening shall be a minimum of six (6) feet in height placed adjacent to the waste receptacles, storage or loading areas so as to effect screening from any adjacent streets and any adjoining properties.