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14-40128, 2015 U.S. 4, 2015). Citgo’s Corpus Christi refinery operates a wastewater treatment system that sends all oily wastewater to several Corrugated Plate Interceptor (“CPI”) separators. Under NSPS Subpart QQQ, refinery operators are required to put roofs on “oil-water separators.” United States v.
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