AL Sitework Practice Questions - Alabama Sitework Contractor Examination Exam

Why can layered soils (for example sand over clay) create special excavation hazards?

Layers always make trenches safer than uniform clay Differing strengths and seepage paths can cause raveling or failure not predicted by a single soil type assumption Layers eliminate the need for protective systems at any depth Layers automatically classify as stable rock

Correct Answer:

Differing strengths and seepage paths can cause raveling or failure not predicted by a single soil type assumption

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