Arizona ROC A-7 Piers & Foundations Practice Questions - Arizona ROC A-7 Piers And Foundations (Commercial) Examination Exam

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When excavating a deep building foundation in sandy soil below the water table, which dewatering system is most effective for lowering the water table by 15 feet around the perimeter before excavation begins?

A pre-bored wellpoint system with header pipes and vacuum pumps Open sump pumping from within the center of the excavation pit Gravity trench drains lined with non-woven geotextile fabric Electro-osmosis dewatering electrodes

Correct Answer:

A pre-bored wellpoint system with header pipes and vacuum pumps

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