Original discussion here
Section 107 (2) of the Resource Management Act 1991 allows consent authorities to grant resource consents allowing the discharge of contaminants into water such as lakes, rivers, or the ocean, provided
(a) That exceptional circumstances justify the granting of the permit; or
(b) That the discharge is of a temporary nature; or
(c) That the discharge is associated with necessary maintenance work—
and that it is consistent with the purpose of this Act to do so.
As the discussion on Frogblog pointed out, there is no time limit on such "exceptional" or "temporary" consents, and the clause is used to allow paper mills in the Bay of Plenty to engage in ongoing and routine pollution.
A bill could apply a time limit to any consent granted under s107(2), to force such polluters to clean their act up.