3. For the purpose of the Act—
(a)hazardous substances are substances, mixtures or preparations—
(i)falling within a category in column 1 of Part 1 of Schedule 1 to these Regulations,
(ii)specified in column 1 of Part 2 of that Schedule, or
(iii)meeting the description in column 1 of Part 3 of that Schedule,
and present as raw materials, products, by-products, residues or intermediates; and
(b)the controlled quantity of a hazardous substance is the quantity specified in column 2 of that Schedule corresponding to that substance.
4. Schedule 2 to these Regulations has effect.