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12047 Social & Preventive Medicine

Which of the following statement regarding Septic tank is true ?

AThe minimum capacity of a septic tank should be at least 100 gallons
BA capacity of 20-30 gallons or 2 & half to 5 c.ft. per person is recommended for household septic tanks
CThe length of septic tank is usually equal to its breadth.
DThere should be a minimum air space of 3 cm between level of liquid in the tank & under-surface of the cover
Social & Preventive Medicine
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