A settling CWA defendant that violated its NPDES permit and the Colorado Water Quality Control Act in discharging stormwater from its municipal separate storm sewer system must implement citywide injunctive relief to comply with its NPDES permit, perform $11 million of mitigation to offset the environmental harm caused by the alleged violations, pay the United States a $1 million civil penalty, and perform a state-approved supplemental environmental project valued at $1 million.