All business, production, servicing, processing and storage shall take place within completely enclosed buildings, except as may be shown on site plans approved by the Planning Commission as provided in Chapter 1278. Where approved by the Commission, outdoor storage shall be permitted only as an accessory use, and shall be incidental and subordinate to a principal use permitted in the I-L District, subject to the following:
(a) Outdoor storage shall be screened from view from all streets (including Interstate 71) and from adjacent residential districts. Screening may include building walls, solid fences, mounds, landscaping or any combination thereof which forms a year-round solid screen.
(b) All materials or waste which might cause fumes or dust or which constitute a fire hazard or which may be attractive to rodents or insects shall be stored outdoors only in closed containers designed for that purpose.