Building Construction
During percussion drilling

Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole
All listed here
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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Building Construction
Slate

Has a smooth surface and contains alumina and silica
Is a metamorphic rock
Possesses good water absorption capacity
Splits into thin sheets along its bedding planes

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