Provide signs a message saying "the HAZMAT storage locations. Unauthorized access prohibited. " Closing statement at the entrance to the venue, then clearly all the time.
Provided that the sign's message. "The storage of hazardous chemicals. Do not enter without permission "posted at the entrance, where it was made clear at all times.
Provide signs inform message. "A place to store hazardous chemicals. No entry without permission. " Posters in the entrance place to clear all the time.