CHST Practice Test – Complete Exam Preparation

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What is the required height-to-depth ratio for trenching in Type B materials?

1:2

1:3

1:1

The required height-to-depth ratio for trenching in Type B materials is 1:1. This means that for every foot of depth, the trench walls can safely rise one foot high without the need for additional support systems.

Type B materials generally include cohesive soils that exhibit some strength, like clay, which can hold its shape better than less stable materials. A 1:1 ratio indicates that these soils can provide a higher level of stability under these conditions than looser or less cohesive materials.

Options presenting ratios like 1:2, 1:3, or 2:1 suggest greater slopes than are permissible. Such ratios would be more applicable to Type C materials or other conditions where additional stability measures would be necessary to prevent cave-ins. Therefore, the 1:1 ratio accurately reflects the safety precautions required when trenching in Type B materials, balancing safety without unnecessary support infrastructure.

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2:1

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