Trenching soil classifications fall into what classifications?

• A. Loosely compacted soils
• B. Stable, ABC
• C. Soft, stable
• D. Hard, loose

Answer: (B)

Trenching soil classifications rely on three stability-based categories. Soils are evaluated for cohesion and stability and are placed into three classes used in safety practice, often referred to as ABC classifications. This ABC framework—covering the most stable to the least stable soils—guides the protective measures required for an excavation. The idea is that any trench soil should be categorized into these three ABC classes so the right safety controls can be chosen. That’s why the best choice describes trenching soils as falling into ABC classifications (the ABC framework for soil stability). The other phrasing doesn’t reflect this standard three-class system used in trench safety.