Building Construction
Depth of lean concrete bed placed at the bottom of a wall footing, is kept

Equal to its projection beyond wall base
15 cm
10 cm
Less than its projection beyond wall base

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Building Construction
Rotary drilling

Is not economical for holes of less than 10 cm
All listed here
Hinders the ground water observations and permeability test
Is not suitable for deposits containing very coarse gravel

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