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In section 161 of that Act (anti-pollution works and operations) in subsection (1), after paragraph (b) there shall be inserted the words— " and, in either case, the Agency shall be entitled to carry out investigations for the purpose of establishing the source of the matter and the identity of the person who has caused or knowingly permitted it to be present in controlled waters or at a place from which it was likely, in the opinion of the Agency, to enter controlled waters. "
In subsection (3) of that section (Agency entitled to recover expenses of works or operations from the person responsible for the pollution) for the words "or operations" there shall be substituted the words ." operations or investigations "
In subsection (4) of that section (exception for expenses of works or operations in respect of water from an abandoned mine)—
After that subsection there shall be inserted—
In subsection (6) of that section (definitions), after the definition of "controlled waters" there shall be inserted—