Solid wastes from single- and two-family homes, if stored outdoors, shall be placed in metal or plastic receptacles with tight-fitting covers. Such receptacles shall not be stored or placed within any front yard area prior to the time at which solid wastes are permitted to be placed at the curblines for collection. Such receptacles may be stored in either the rear or side yard area, but if within a side yard area, they shall be screened from view of adjoining properties and street areas with planting or fencing. Proposed developments of 25 or more single- or two-family residential dwelling units shall provide an area for the storage of mandatory recyclable materials, either indoors or outdoors.