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1. A septic tank of 7 m3 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): 10 years
(B): 3 years
(C): 5 years
(D): 7.5 years
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