(1)Any person duly authorised in writing by the Secretary of State or by a planning authority may at any reasonable time enter any land for the purpose of surveying it in connection with—
(a)any application for hazardous substances consent, or
(b)any proposal to issue a hazardous substances contravention notice.
(2)Any person duly authorised in writing by the Secretary of State or by a planning authority may at any reasonable time enter any land for the purpose of ascertaining whether an offence appears to have been committed under section 21.
(3)Any person who is an officer of the Valuation Office or a person duly authorised in writing by the Secretary of State or by a planning authority may at any reasonable time enter upon any land for the purpose of surveying it, or estimating its value, in connection with a claim for compensation in respect of that land or any other land made by virtue of section 14 or 17.
(4)Any person duly authorised in writing by the Secretary of State or a planning authority may at any reasonable time enter any land in respect of which a hazardous substances contravention notice has been served for the purpose of ascertaining whether the notice has been complied with.
(5)Subject to sections 34 and 35, any power conferred by this section to survey land shall be construed as including power to search and bore for the purpose of ascertaining the nature of the subsoil or the presence of minerals in it.