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A grading contractor discovers unsuitable soil conditions 3 feet below the planned foundation level. The soil exhibits high plasticity and poor drainage. What is the most appropriate remedial action?

Correct Answer

B) Over-excavate and replace with engineered fill

High plasticity soils with poor drainage are typically unsuitable for foundation support. Over-excavation and replacement with properly compacted engineered fill is the most reliable solution.

Answer Options
A
Add lime stabilization to improve the soil
B
Over-excavate and replace with engineered fill
C
Install a deeper drainage system only
D
Increase the foundation width to distribute loads

Why This Is the Correct Answer

High plasticity soils with poor drainage are typically unsuitable for foundation support. Over-excavation and replacement with properly compacted engineered fill is the most reliable solution.

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