Soils described as a CH would be ______

• A. High plasticity clays
• B. Low plasticity clays
• C. Silty sands
• D. Organic peat

Answer: (A)

In this notational system, the two-letter code CH means a clay with high plasticity. The first letter indicates the soil type (C = clay), and the second letter indicates the plasticity level (H = high). So soils described as CH are inorganic clays that exhibit high plasticity, typically showing a high liquid limit and plasticity index. They are cohesive and can undergo significant deformation with moisture changes, often prone to shrink-swell behavior. This is why the correct description is high plasticity clays, rather than low plasticity clays, silty sands, or organic peat.