Building Construction
The range of spread from the wall base to outer edge of a brick work foundation does not exceed

2 horizontals to 1 vertical
1/2 horizontal to 1 vertical
1 horizontal to 1 vertical
2/3 horizontal to 1 vertical

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Building Construction
Rotary drilling

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

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