If the soil is previously disturbed, how should it be classified?

In situations where soil has been previously disturbed, it is classified as Class C. This classification is typically applied to soil that has undergone substantial changes due to excavation, fill, or other human activities, thereby affecting its natural properties and stability. Class C soil may exhibit reduced load-bearing capacity or other characteristics that can affect construction and environmental considerations.

Class C is particularly important because it indicates the need for careful assessment and management, ensuring that any engineering or construction work acknowledges the previous disturbances. Recognizing this classification helps professionals in planning and applying suitable methods to mitigate risks associated with working on disturbed ground.

The other classifications, like Class A or Class B, would relate to undisturbed or stable conditions, emphasizing the unaltered nature of the soil, which is not applicable in cases of previously disturbed soil. Likewise, stable rock is distinctly different from soil classifications and pertains to non-soil materials, making it irrelevant in this context.