The Idaho Conservation League (“League”) has petitioned for review of the effluent discharge limits in a National Pollution Discharge Elimination System (“NPDES”) permit issued by the U.S. Environmental Protection Agency, Region 10, to the City of Sandpoint, Idaho, for Sandpoint’s wastewater treatment facility. In its petition, the League objects to the size of the mixing zones used to set the effluent limits for phosphorus discharges in the City of Sandpoint’s permit.