MARCUS HOOK, PA, OIL REFINERY OWNED AND OPERATED BY SUN COMPANY, INC. (R & M), VIOLATED PRETREATMENT REQUIREMENTS ESTABLISHED IN SECTION 307 OF CWA. SUN CAUSED THE RECEIVING POTW DELCORA TO VIOLATE NPDES LIMIT FOR OIL AND GREASE, VIOLATING THE PROHIBITION AGAINST PASS THROUGH. SUN ALSO VIOLATED FEDERAL CATEGORICAL PRETREATMENT STANDARDS FOR OIL AND GREASE AND AMMONIA NITROGEN. FINALLY SUN HAS VIOLATED LOCAL LIMITS ESTABLISHED BY THE EPA-APPROVED PRETREATMENT PROGRAM OF THE RECEIVING POTW DELCORA. EPA SEEKS BOTH PENALTIES AND INJUNCTIVE RELIEF AGAINST SUN FOR THE RECURRING VILOATIONS OF CWA 307. **NOTE: STATE IS DELEGATED FOR THE PROGRAM EXCEPT FOR PRETREATMENT (PA NOT AUTHORIZED).