Layered Geological Strata
Accident Prevention Recommendations
If soils are configured in layers, the soil must be classified on the basis of the soil classification of the weakest soil layer. Each layer may be classified individually if a more stable layer lies below a less stable layer, (for example, where a Type C soil rests on top of stable rock.)
If soils are configured in layers, the soil must be classified on the basis of the soil classification of the weakest soil layer.
The standard also contains other important criteria that must be examined to classify soils properly.
Important:
- The laboratory testing process and compressive strength calculations must be conducted under the direction of a registered professional engineer.
- The OSHA standard requires that the excavation protection system be designed by a registered professional engineer when the depth of the excavation exceeds 20 feet or where unusual site conditions exist.
- The manual field testing alternative permitted under the standard does not require the approval of a registered professional engineer under certain specific conditions. However, at least one visual test and one manual test are required to classify soil according to the OSHA method. The specific manual and visual field tests are listed and described in the standard.
Knowledge Check Choose the best answer for the question.
2-5. If soils are configured in layers, the soil must be classified on the basis of the soil classification of _____.
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