An owner shall ensure that a recreational pool, semipublic pool, or public spa has a chemical storage area that: Is protected against the weather, excess heat, and moisture; and Has: A lockable door which can be opened from the inside; Ventilation that is sized at 2 cfm per square foot of floor area and that exhausts to the open air; A minimum of 20 footcandles of illumination; and Storage for chemicals in accordance with the material safety data sheet for a particular chemical.