MURPHY OWNS AND OPERATES THE MERAUX OIL REFINERY IN ST. BERNARD PARISH. MURPHY HAS NINE AUTHORIZED DISCHARGE POINTS UNDER NPDES ISSUED ON MARCH 16, 1984. OUTFALL OO1 AUTHORIZED THE DISCHARGE OF ONCE-THROUGH NONCONTACT COOLING WATER TO THE MISSISSIPPI RIVER. OUTFALLS 003 THROUGH 009 AUTHORIZED STORMWATER DISCHARGES TO TWENTY ARPENT DRAINAGE CANAL. EFFLUENT VIOLATIONS HAVE OCCURRED PRINCIPALLY AT OUTFALL 002 WHICH DISCHARGES APPROXIMATELY TWO (2) MILLION GALLONS PER DAY (MGD) INTO TWENTY ARPENT DRAINAGE CANAL, A WATER QUALITY LIMITED RECEIVING WATER IN THE LAKE PONCHART- RIAN BASIN.