PREGERSON, Circuit Judge:
The Sierra Club brought a citizen enforcement action against Union Oil Company of California ("Union Oil") alleging that Union Oil violated the terms of its National Pollutant Discharge Elimination System ("NPDES") permit on seventy-six occasions. After a five-day trial, the district court found no violations of the permit. The court excused some of the reported exceedances of permit limitations by application of an upset defense (an excuse...
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