What is required for a storage area containing more than 660 gallons?

For a storage area containing more than 660 gallons of liquid, a raised sill is required as a safety measure. This is crucial to help contain any potential spills or leaks that could occur from the stored liquids. The raised sill effectively acts as a barrier, preventing liquids from flowing out of the designated storage area and potentially causing environmental hazards or safety risks. This regulation is essential in maintaining safety standards and ensuring compliance with fire codes, which aim to protect both personnel and property.

While other options may play a role in safety, they are not necessary specifically for handling large volumes of liquid. For instance, a raised floor may not be as effective as a raised sill in containing spills, and a ventilation system would not address the immediate concerns of liquid containment. Warning signs are valuable for communication but do not provide a physical barrier or control measure for spills. Thus, the raised sill is recognized as a critical requirement for managing such quantities of stored liquids.