57.—(1) SEPA may arrange for steps to be taken to remove an imminent risk of serious pollution if it considers that the operation of any installation or mobile plant regulated by a permit, or the operation in a particular manner, involves such a risk.
(2) SEPA may arrange for steps to be taken towards remedying the effects of pollution caused by the commission of an offence under regulation 67(1)(a), (b) or (d).
(3) SEPA must, at least seven days before steps are taken under paragraph (2), give notice to the operator of those steps.
(4) SEPA may recover the cost of taking steps under this regulation from the operator of the installation or mobile plant concerned.
(5) Paragraph (4) does not apply in respect of costs—
(a)for steps taken under paragraph (1), if the operator shows that there was no imminent risk of serious pollution requiring any such steps to be taken,
(b)which the operator shows to have been unnecessarily incurred by SEPA.