What type of soil is categorized as Type A?

Type A soil is characterized by having cohesive properties, which means it can maintain its structure and stability under stress. Clay falls into this category because it contains fine particles that bond together, providing strength, especially when moistened. This cohesive nature makes Type A soil suitable for various construction activities, as it is less likely to collapse when excavated compared to soils that lack cohesive properties.

Cohesive soils like clay are able to withstand higher loads and exhibit a stable structure, which is why they are classified as Type A. The other types of soil mentioned in the question, such as loose sand (which is non-cohesive), granite (which may not exhibit the same characteristics associated with soil), and organic soil (which typically has low strength and is less stable), do not meet the criteria for Type A classification. Thus, clay's cohesive properties firmly categorize it as Type A soil, aligning with the definitions and standards outlined in OSHA regulations.