Soil Condition

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In the case of hard rock (e.g., granite, limestone, basalt, hard sandstone) in a structure of uniform strength

In the case of soft rock (e.g., soft sandstone, clay shale, marl stone) and in the case of hard rock with alternating stratification or with numerous fissures

In the case of mantle rock (e.g., non-cohesive soils such as gravel, sand, cohesive soils, silts or clays with a consistency better than stiff)