Hon DAVID PARKER (Minister for the Environment): Last year, the Government agreed to "reconsider the possibility of a DIN bottom line of 1 mg/l (likely with exceptions)" and, in doing so, to revisit the environmental and economic implications. When I take a recommendation on a dissolved inorganic nitrogen (DIN) bottom line to Cabinet, I will be considering the current requirements of the National Policy Statement on Freshwater Management (NPSFM) 2020 and advice of the scientific and technical advisory group. I'd also like to make the point that the periphyton attribute carried over into the NPSFM already, effectively, provides for a DIN level below 1 milligram for gravel-bottomed rivers. The outstanding issue is muddy-bottomed rivers. I would say that we have to be careful that we don't want a DIN of 1 milligram to, effectively, become a weaker target for gravel-bottomed rivers.