Building Construction
Auger boring

Is generally employed in cohesive and other self soils above water table
All of these
Is most economical up-to a depth of 5 meters
Is the most primitive method for making a hole in the ground

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Building Construction
During percussion drilling

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

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