AL Sewer Projects Practice Questions - Alabama Sewer Projects Contractor Examination Exam

Why is groundwater control important during deep sewer trench excavation?

Water always improves soil cohesion for vertical walls Uncontrolled water can destabilize trench walls, flood the work, and ruin bedding Groundwater eliminates OSHA protective-system requirements Water automatically densifies haunch material

Correct Answer:

Uncontrolled water can destabilize trench walls, flood the work, and ruin bedding

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