A septic tank of 7 m in volume serves for 5 people. If the rate of accumulation of sludge is 70 litres per capita per year and sludge is removed when it occupies 50% of its volume, what is the cleaning interval of septic tank ?

A septic tank of 7 m in volume serves for 5 people. If the rate of acc

1.	A septic tank of 7 m in volume serves for 5 people. If the rate of accumulation of sludge is 70 litres per capita per year and sludge is removed when it occupies 50% of its volume, what is the cleaning interval of septic tank ?
A.	3 years
B.	5 years
C.	7.5 years
D.	10 years
Answer» E.

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A septic tank of 7 m in volume serves for 5 people. If the rate of accumulation of sludge is 70 litres per capita per year and sludge is removed when it occupies 50% of its volume, what is the cleaning interval of septic tank ?

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