SCHEDULE 5Requirements for silos
I14
1
The base of the silo must be—
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: 198719, 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: 199020.
2
The base of the silo, the base and walls of its effluent tank and channels and walls of any pipes must be impermeable.