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4.—(1) The base of the silo must be —E+W
(a)designed in accordance with the code of practice for design of concrete structures for retaining aqueous liquids published by the British Standards Institution and numbered BS 8007: 1987(1); or
(b)constructed using appropriate hot-rolled asphalt in accordance with the code of practice for selection and use of construction materials published by the British Standards Institution and numbered BS 5502:Part 21: 1990(2).
(2) The base of the silo, the base and walls of its effluent tank and channels and walls of any pipes must be impermeable.
Publication date: 30th October 1987. ISBN 0-580-16134-X.
Publication date: 31st December 1990. ISBN 0-580-18348-3.