Building Construction
The loose pockets in soil mass can be bridged safely by providing a raft foundation provided the soft area is smaller than

Half the column spacing
One-third the column spacing
The column spacing
Three-fourth the column spacing

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Building Construction
During percussion drilling

All listed here
The soil to a considerable depth below the bottom of the hole gets disturbed
Caving or mixing of strata are caused in soft soils or cohesion-less soils
Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole

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