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Soil Survey Manual - Table 3-20

Penetration resistance classes

Classes Penetration resistance (MPa)
Small < 0.1
     Extremely low < 0.01
     Very low 0.01 - 0.1
Intermediate 0.1 - 2
     Low 0.1 - 1
     Moderate 1 - 2
Large > 2
     High 2 - 4
     Very high 4 - 8
     Extremely high > 8