Which soil type typically requires more stringent safety measures for excavations?

The correct answer is Type C soil. Type C soil typically consists of loose, granular materials such as gravel and sand, which can be less stable than other soil types. Excavations in Type C soils require more stringent safety measures because they have a higher risk of collapse. The instability of this type of soil is exacerbated when wet or subjected to vibration or disturbance, leading to potential hazards for workers.

The safety regulations for excavations outline a hierarchy of soil types, with Type C being the least stable and thus warranting the most caution. It is crucial for safety practices to account for these factors to ensure the well-being of all personnel involved in excavation work. Understanding the soil classifications helps in determining necessary protective systems and precautions to prevent accidents and injuries on the job site.