What characterizes class C soil according to OSHA?

Class C soil, according to OSHA, is characterized by being previously disturbed. This classification indicates that the soil has undergone changes due to construction activities, excavation, or other forms of disturbance, which can affect its stability and behavior. Understanding that class C soils are previously disturbed helps workers recognize the potential risks involved, as such soils may exhibit less predictable characteristics compared to undisturbed soils.

In contrast, stable and well-drained soil would typically align more with class A soil, providing greater stability for excavation. Loose and friable soil is a trait associated with class B soil, which can handle some loads but may also pose risks if not managed properly. Highly compacted soil does not accurately describe class C soil, as compaction generally indicates a more stable condition, typically seen in class A classifications. Each of these characteristics plays a role in determining safety measures and excavation techniques, which are crucial for maintaining a safe work environment around excavations and trenches.