|(a) Walking and driving areas. The outdoor walking
and driving areas shall be surfaced with concrete, asphalt, or gravel
or other materials that have been effectively treated to minimize
dust, facilitate maintenance, and prevent muddy conditions.
(b) Exterior surfaces. Exterior surfaces of buildings
and mobile food units shall be of weather-resistant materials and
shall comply with law.
(c) Storage areas. Outdoor storage areas for refuse,
recyclables, or returnables shall be of materials specified in §228.152(b)
and (c) of this title.