149.—(1) Compliance with a hazardous substances contravention notice shall not discharge that notice.
(2) Without prejudice to subsection (1), where a provision of a hazardous substances contravention notice requires a hazardous substance to be removed from the land to which the notice relates, the presence on, over or under that land of a quantity of that substance equal to or exceeding its controlled quantity at any time after the substance has been removed in compliance with the hazardous substances contravention notice shall be in contravention of that notice.
(3) Without prejudice to subsection (1), where a provision of a hazardous substances contravention notice requires the quantity of a hazardous substance on, over or under land to which the notice relates to be reduced below a specified quantity (being greater than the controlled quantity), the presence on, over or under that land of a quantity of that substance equal to or in excess of the specified quantity at any time after the quantity of that substance has been reduced below the specified quantity in compliance with the hazardous substances contravention notice, shall be in contravention of that notice.
(4) Without prejudice to subsection (1), where a provision of a hazardous substances contravention notice requires steps to be taken to remedy a failure to comply with a condition subject to which a hazardous substances consent was granted, after those steps have been taken no further steps shall be taken which would constitute a breach of that condition, and the taking of such further steps shall be in contravention of that notice.
(5) Sections 146 and 147 shall apply to the contravention of a hazardous substances contravention notice to which this section applies as if the period for compliance with the notice had expired on the date the contravention took place, but a person authorised in writing by the council shall not enter the land under section 146(1) without, at least 28 days before entry, serving on the owner or occupier of the land a notice of that person’s intention to do so.