Which term is associated with over 5 feet and requires protection like shoring or trench box?

• A. Profile Plan
• B. Excavation Depth Concern
• C. Outfall Line
• D. Gravity Main

Answer: (A)

The main idea here is trench safety and the requirement for protective systems as depth increases. When an excavation reaches five feet or more, regulations require protective measures like shoring or trench boxes to prevent collapses. The term that best fits this situation is a phrase that clearly ties depth to the need for protection—“Excavation Depth Concern.” It directly signals that as depth increases, guarding the trench becomes a concern.

The other options don’t address protection for deep trenches: a profile plan is a drawing showing vertical alignment, an outfall line is a discharge path for fluids, and a gravity main is a type of sewer pipe. They describe concepts or components unrelated to the safety protection required for deep excavations.