Which of the following describes a trench exceeding 60 inches in depth?

When dealing with trenches that exceed 60 inches in depth, safety becomes the primary concern. The correct answer highlights the necessity for additional support measures, such as shoring or bracing, to prevent cave-ins, which are significant hazards in deep excavations. OSHA (Occupational Safety and Health Administration) sets strict guidelines for trench safety, particularly for depths greater than 5 feet, where the risk of a trench collapse increases substantially.

Additional support measures help ensure the stability of the trench walls and protect workers from injury or fatality. This is crucial during excavations in various soil types and conditions, and failing to implement such measures can lead to dangerous situations. Proper design and safety precautions not only comply with legal requirements but also ensure a safer working environment.

The other options do not adequately acknowledge the risks associated with deep trenches. While manual excavation may seem feasible, it poses significant safety risks without proper support. Additionally, deep-root plants may thrive in deeper soils, but this is unrelated to the excavation safety concerns. Lastly, suggesting that a trench exceeding 60 inches is permissible without shoring contradicts regulatory standards and ignores the dangers of collapse in deep excavations.