HUG, Circuit Judge:
In this case, we determine whether the Environmental Protection Agency ("EPA") properly issued a National Pollution Discharge Elimination System ("NPDES") permit under the Clean Water Act to Carlota Copper Company ("Carlota"). The permit allows mining-related discharges of copper into Arizona's Pinto Creek, a waterbody already in excess of water quality standards for copper. Based upon provisions of the Clean Water Act, the implementing regulations...
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