If, in a case where a local authority has served a remediation notice, the contaminated land in question becomes a special site, the appropriate Agency may adopt the remediation notice and, if it does so,—
Where a local authority has, by virtue of section 78N above, begun to do any thing, or any series of things, by way of remediation—
If and so long as any land is a special site, the appropriate Agency may from time to time inspect that land for the purpose of keeping its condition under review.
If it appears to the appropriate Agency that a special site is no longer land which is required to be designated as such a site, the appropriate Agency may give notice—
terminating the designation of the land in question as a special site as from such date as may be specified in the notice.
A notice under subsection (4) above shall not prevent the land, or any of the land, to which the notice relates being designated as a special site on a subsequent occasion.
In exercising its functions under subsection (3) or (4) above, the appropriate Agency shall act in accordance with any guidance given for the purpose by the Secretary of State.