EXPLORER PIPELINE CO

Incident Narrative

ON APRIL 21, 2012 THE FLOAT SWITCH ON THE MUD SUMP THAT TIES TO THE PRODUCT SUMP AT THE WOOD RIVER TANK FARM FAILED TO ENGAGE. WHEN THE SWITCH FAILED TO ENGAGE, A MIXTURE OF PRODUCT AND WATER BEGAN TO FILL THE MUD SUMP AND THE DRAIN SYSTEM UNTIL MUD SUMP OVERFILLED. THE DRAIN SYSTEM WAS TESTED TO 275 PSIG, BUT THE MUD SUMP IS AN ATMOSPHERIC SYSTEM. THEREFORE, THE PRESSURE AT THE TIME OF THE INCIDENT WAS ATMOSPHERIC PRESSURE AND THE MAXIMUM OPERATING PRESSURE WAS LISTED AS 275 PSIG. THE PRODUCT WAS CONTAINED ON THE PROPERTY AND ALL FREE-PHASE PRODUCT WAS REMOVED. ANY PETROLEUM IMPACTED SOIL WAS TESTED AND PROPERLY DISPOSED. THE NATIONAL RESPONSE CENTER WAS INITIALLY NOTIFIED BY 12:30 HOUR CST VIA THE NRC ON-LINE REPORTING SYSTEM FOLLOWED BY A NOTIFICATION TO THE ILLINOIS EMERGENCY MANAGEMENT. WHEN A RESPONSE TO THE ON-LINE NOTIFICATION WASN'T RECEIVED FROM THE NRC, A TELEPHONIC INQUIRY TO THE NRC WAS CONDUCTED. WHEN THE NRC INDICATED THE ON-LINE SUBMITTAL WAS NOT RECEIVED, A TELEPHONIC NOTIFICATION WAS PROVIDED. THE SUPPLEMENTAL REPORT WILL ALSO REFLECT THE CLEAN-UP COSTS UNDER THE OPERATOR EMERGENCY RESPONSE DOLLAR FIGURE AS INDICATED IN PHMSAS F7000-1 INSTRUCTIONS SINCE NO LONG TERM REMEDIATION ASSOCIATED WITH THIS INCIDENT. REPORT WAS SUPPLMENTED TO ACCOUNT FOR QUESTION E5F.