4.—(1) The remediation must consist of such primary remediation or complementary remediation or both as will achieve the objective.
(2) Primary remediation is any remedial measure which returns the damaged natural resources or impaired services to, or towards, the state that would have existed if the damage had not occurred (and for this purpose natural recovery is a permitted form of primary remediation in appropriate cases).
(3) Complementary remediation is any remedial measure taken in relation to natural resources or services to compensate for the fact that primary remediation does not result in fully restoring the damaged natural resources or impaired services to the state that would have existed if the damage had not occurred.