A professional engineer is needed to design sloping and benching plans for excavations in type C soil deeper than how many feet?

A professional engineer is needed to design sloping and benching plans for excavations in type C soil deeper than how many feet?

• A. 16 feet
• B. 12 feet
• C. 20 feet
• D. 8 feet

Answer: (A)

In type C soil, the ground is the least stable, so deeper excavations require engineering input to ensure the protective system will actually hold. The main idea here is that once the excavation depth exceeds a certain limit, an engineer must design the sloping and benching plans to account for how the soil will behave under load, groundwater, and other conditions. That limit is set so that the protective approach is formally designed by a professional, not improvised on site. So, with type C soil, beyond that specific depth, you need a professional engineer to create the sloping and benching design. The depth used in this item is 16 feet, which is why that choice is correct: it marks the point at which the design must be engineered rather than handled under non-engineered procedures. If the excavation is shallower than that, the standard protective measures can be applied under the supervision of a competent person, but once you go past the threshold, an engineer’s design is required to maintain safety.

In type C soil, the ground is the least stable, so deeper excavations require engineering input to ensure the protective system will actually hold. The main idea here is that once the excavation depth exceeds a certain limit, an engineer must design the sloping and benching plans to account for how the soil will behave under load, groundwater, and other conditions. That limit is set so that the protective approach is formally designed by a professional, not improvised on site.

So, with type C soil, beyond that specific depth, you need a professional engineer to create the sloping and benching design. The depth used in this item is 16 feet, which is why that choice is correct: it marks the point at which the design must be engineered rather than handled under non-engineered procedures. If the excavation is shallower than that, the standard protective measures can be applied under the supervision of a competent person, but once you go past the threshold, an engineer’s design is required to maintain safety.