What must be done when debris is thrown down through holes without chutes?

When debris is being thrown down through holes without chutes, appropriate safety measures need to be implemented to protect workers and bystanders from potential hazards. Enclosing the area with barricades is essential as it creates a physical barrier that helps prevent individuals from entering or working in an area where falling debris may pose a risk. This action is crucial in ensuring that no one inadvertently walks into danger.

While the use of nets, hard hats, and warning signs are all important aspects of safety in construction, they do not provide the same level of protection as enclosing the area with barricades. Barricades help to create a designated safety zone, clearly indicating where the hazards are and keeping workers at a safe distance. Therefore, ensuring the area is fully enclosed with proper barriers is the correct and most effective measure when handling debris that could fall through openings.