ROADRUNNER PIPELINE, L.L.C.

Incident Narrative

10/22/2015 FINALIZED INVESTIGATION REPORT: UPON FURTHER INVESTIGATION OF SCADA RECORDS, ALARMS, CONTROL ROOM PROCEDURES, AND ONSITE REVIEW OF THIS PIPELINE, IT WAS DETERMINED THAT ROADRUNNER UNIT 1 SHUT DOWN, WHICH CAUSED A MOMENTARY SPIKE IN METER PRESSURE. THIS EVENT TRIGGERED ONE OR MORE OF THE THREE RELIEF VALVES TO ACTIVATE. THE CONTROLLER RECEIVED A SCADA SYSTEM HIGH SUMP ALARM FOLLOWED BY HIGH/HIGH SUMP ALARM, AT WHICH TIME THE BOOSTER PUMP WAS SHUT DOWN. FOLLOWING THE INCIDENT, THE RELIEF VALVES WERE REMOVED, TESTED, AND PLACED BACK INTO SERVICE. CORRECTIVE ACTIONS: 1. CONTROL CENTER PROCEDURES HAVE BEEN UPDATED TO VERIFY THE BOOSTER PUMP IS SHUT DOWN AS PART OF THE INITIAL SHUTDOWN PROCEDURE STEPS. 2. SCADA SYSTEM LOGIC WAS UPDATED TO SHUT DOWN BOOSTER WHEN THE SUMP REACHES HIGH/HIGH LEVEL. ********************************************************************************************************************************* AT 17:15 ON 6/6/15, THE HEP CONTROLLER RECEIVED A HIGH SUMP LEVEL OF 75% FROM THE SUPERVISORY CONTROL AND DATA ACQUISITION ON THE ROADRUNNER PUMP STATION. THE CONTROLLER SHUTDOWN THE PUMP STATION, CLOSING ALL VALVES TO THE PUMPS, THEN BLOCKED IN THE PIPELINE PER PROCEDURE. THE CONTROLLER THEN CONTACTED A FIELD TECHNICIAN TO INVESTIGATE, EXPLAINING EVEN THOUGH EVERYTHING WAS BLOCKED IN, THE SUMP PERCENTAGE CONTINUED TO CLIMB. AT 17:44 THE FIELD TECHNICIAN ARRIVED, DISCOVERING 10 GALLONS (.25 OF A BARREL), HAD OVERFLOWED FROM THE SUMP. A VACUUM TRUCK WAS BROUGHT IN TO EMPTY THE SUMP. THE CONTAMINATED SOIL WAS EXCAVATED AND PLACED ON PLASTIC FOR PROPER REMOVAL, MICROBES APPLIED TO CONTAMINATED AREA. AT 19:15 THE PIPELINE WAS RESTARTED WHILE BEING MONITORED ONSITE TO ATTEMPT TO ASCERTAIN WHAT CAUSED THE SUMP TO FILL UP. ALTHOUGH NO SOURCE WAS FOUND, THROUGH THE INVESTIGATION PROCESS, IT IS BELIEVED THAT A THERMAL RELIEF VALVE OR OTHER TYPE OF RELIEF DEVICE POSSIBLY ACTIVATED, CAUSING THE SUMP TO OVERFLOW. ALL SYSTEMS HAVE BEEN CHECKED FOR PROPER OPERATION, AND ARE NOW RESTORED TO NORMAL OPERATION.