MEDALLION OPERATING COMPANY, LLC

Incident Narrative

UPDATE: (8/4/20) ANALYTICAL RESULTS RECEIVED 6/29/20 TAKEN FROM THE AFFECTED SOIL PILES, INDICATED SOIL WAS REMEDIATED AND CLEARED. THE SOIL WILL BE USED FOR GRADING AND FILL MATERIAL ONSITE. ON THURSDAY, APRIL 23, 2020 AT 0930, MEDALLION'S CONTROL CENTER RECEIVED A CALL ON THE EMERGENCY RESPONSE TELEPHONE LINE FROM A MEMBER OF THE PUBLIC. THE CALLER REPORTED A LEAK AND AND IDENTIFIED THE OPERATOR'S UNMANNED 158 STATION (PUMP STATION) AS THE SOURCE. THE CONTROL CENTER IMMEDIATELY REVIEWED THE STATION'S SCADA SCREENS AND ALARMS BUT DID NOT FIND AN INDICATION OF A LEAK. ON-DUTY CONTROLLERS THEN DISPATCHED OPERATOR FIELD PERSONNEL TO INVESTIGATE THE REPORT. THE LEAK WAS CONFIRMED AND ISOLATED AT 0951 BY LOCAL OPERATIONS PERSONNEL. THE ENTIRE STATION WAS SHUT DOWN BY THE CONTROL CENTER AT 0953. THE ONSITE OPERATOR PERSONNEL FOUND THAT THE LEAK ORIGINATED FROM A FITTING OF A PILOT OPERATED RELIEF VALVE. A 3/8 INCH MALE TO FEMALE HEX NIPPLE CRACKED IN THE THREADS RESULTING IN THE CRUDE OIL RELEASE. THE NIPPLE WAS REPLACED AND THE STATION WAS RETURNED TO SERVICE AT APPROXIMATELY 1020 ON APRIL 23. THE INITIAL RESPONSE TEAM COMPLETED DELINEATION OF THE SPILL VOLUME AND DETERMINED THE LEAK MET THE ACCIDENT REPORTING REQUIREMENTS AT 10:30 ON APRIL 23. THE INVESTIGATION INDICATES THAT THE INITIAL RELEASE OCCURRED WHEN THE NIPPLE DEVELOPED A CRACK BUT DID NOT COMPLETELY BREAK. IT WAS DETERMINED THAT THE FAILURE WAS THE RESULT OF A MANUFACTURE DEFECT DURING THE RELIEF VALVE ASSEMBLY PRIOR TO INSTALLATION BY THE OPERATOR. TO PREVENT RECURRENCE OPERATIONS PERSONNEL REPLACED THE DEFECTIVE HEX NIPPLE. SOIL REMEDIATION CONTINUED AT THE SITE UNTIL TUESDAY, APRIL 28TH. SOIL SAMPLES WERE COLLECTED, AND RESULTS ARE PENDING TO DETERMINE IF FURTHER EXCAVATION IS REQUIRED PRIOR TO BACK FILLING. ALL OF THE RELEASED CRUDE OIL WAS RECOVERED VIA VACUUM TRUCKS AND SOIL REMEDIATION. A SUPPLEMENTAL FINAL REPORT WILL BE SUBMITTED ONCE REMEDIATION ACTIVITIES ARE COMPLETE.