Which one of the following statements regarding septic tanks is wrong ?
(A) A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided
(B) The outlet invert level is kept 5 to 7.5 cm below the inlet invert level
(C) The minimum width of septic level is 90 cm
(D) The depth of tank is kept equal to its width
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