SC Water And Sewer Plants Practice Questions - South Carolina Water And Sewer Plants Contractor Examination Exam

Why is structural fill around plant structures placed and compacted in lifts rather than dumped in one deep layer?

Deep, single lifts always compact better under the weight of the soil itself Specified compaction equipment can densify only a limited thickness; thin lifts produce uniform density Lifts are required only for sand, not for clay OSHA forbids any fill thicker than 6 inches in all soils

Correct Answer:

Specified compaction equipment can densify only a limited thickness; thin lifts produce uniform density

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