In the absence of other information, all soil in an excavation should be treated as type C soil.
Type C soil is known as a type of soil that is the least stable. It includes granular soils. In granular soil, the particles don't are unable to stick together. In cohesive soils, there is a low unconfined compressive strength. This is 0.5 tons per square foot or less.
Gravel and sand are examples of type C soil. This type of soil is not unstable. Any soil which has water seeping through it can automatically be classified as Type C soil without considering any of its other characteristics.
Therefore, in absence of other information, all soil should be treated as type C soil.
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