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
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
All listed here

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Building Construction
Slate

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

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