Which of the following is NOT a type of soil defined by OSHA for excavation work?

The classification of soil types for excavation work as defined by OSHA is crucial for determining safety measures and shoring requirements on job sites. OSHA outlines three primary types of soil: Type A, Type B, and Type C.

Type A soil is considered the most stable and cohesive, often consisting of materials such as clay or hardpan. It has a high load-bearing capacity and, when properly excavated, is less prone to collapse.

Type B soil is less stable than Type A and may include granular soils with some cohesion, such as silt. It requires more caution but still offers more stability than the least stable type.

Type C soil is the least stable, typically consisting of loose, granular materials like sand or gravel, which can shift easily and pose significant risks for excavations if not properly managed.

The mention of a Type D soil is not recognized within OSHA's soil classification system, making this option the correct answer as it does not exist. Understanding these classifications allows construction professionals to implement the correct safety measures and ensure worker protection during excavation activities.