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3.—(1) For the purposes of the principal Act(1) a hazardous substance is any substance or mixture, present as a raw material, product, by-product, residue or intermediate—
(a)falling within a category in column 1 of Part 1 of Schedule 1;
(b)specified in column 1 of Part 2 of that Schedule; or
(c)meeting the description in column 1 of Part 3 of that Schedule.
(2) For the purposes of the principal Act, the quantity specified in column 2 of Schedule 1 is the controlled quantity of the corresponding hazardous substance or category of hazardous substance, as the case may be, in column 1 of that Schedule.
4. Schedule 2 has effect.
Section 2(1) of the Planning (Hazardous Substances) (Scotland) Act 1997 provides that the presence of a hazardous substance on, over or under land requires the consent of the planning authority.