OSHA 30 Hour Construction Program Practice Test

What may classify as Type C soil?

1. Clay

2. Silty clay

3. Granular soil

4. Cemented soil

The correct answer is: Granular soil

Type C soil is classified as granular soil, which includes materials such as sand and gravel. This classification comes from the way granular soils behave under load; they have a loose structure with lower cohesion, making them less stable and more susceptible to shifting when excavated. In construction and excavation contexts, understanding soil classification is critical for ensuring safety during operations. Type C soils require special considerations for shoring and trench safety due to their potential for cave-ins and shifting. Recognizing the characteristics of granular soil is essential for implementing the appropriate safety measures. In contrast, clay and silty clay are considered Type A or B soils, respectively, depending on their cohesive properties. Cemented soil can display characteristics that vary depending on the cementation, but it does not fall into the Type C category.