Q.

Septic tank is usually consists of brick wall in cement not less than                

A. 20 cm
B. 100 cm
C. 80 cm
D. 200 cm
Answer» A. 20 cm
Explanation: septic tank is usually consists of brick wall in cement not less than 20cm(9”) thick and the foundation floor are of cement concrete 1:3:6 or 1:2:4. both inside and outside faces of wall and floor are plastered with a minimum thickness of 12mm thick cement mortar 1:3 and all inside corners are rounded.
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