ONEOK GAS STORAGE, LLC

Incident Narrative

AN EF-5 TORNADO CAME THROUGH THE ONEOK GAS STORAGE'S EDMOND STORAGE FACILITY LOCATED NORTH OF EDMOND, OKLAHOMA, AT APPROXIMATELY 1655 HOURS ON 24MAY2011. A ONEOK EMPLOYEE WHO LIVED NEAR THE INCIDENT SITE NOTIFIED THE EDMOND STORAGE SUPERVISOR AFTER THE TORNADO STRUCK THAT THERE WAS LEAKING GAS. ONEOK PERSONNEL WERE DISPATCHED AND VERIFIED A LEAK CAUSED BY A MISSING VENT STACK ON THE F-352 PIG LAUNCHER LOCATED APPROXIMATELY 1.5 MILES WEST OF THE EDMOND STORAGE COMPRESSOR STATION (DAMAGE INCLUDED MISSING VENT STACK AND FENCING). FURTHER FIELD INVESTIGATION REVEALED OTHER DAMAGE (MEASUREMENT, CATHODIC PROTECTION, FENCING, PIPE GUARDS, CORROSION COUPON HOLDERS, ELECTRIC SERVICE) AT FOUR STORAGE WELLS (BRIDAL H-1, BRIDAL H-2, MESSENBAUGH S-1, MESSENBAUGH S-2). THE LINES TO THE LAUNCHER AND ALL FOUR WELLS WERE SHUT IN AND BLOWN DOWN BY 1905 HOURS. THE OKLAHOMA CORPORATION COMMISSION WAS NOTIFIED OF THE DAMAGE AT 2130 HOURS ON MAY 24, 2011. REPAIRS HAVE BEEN COMPLETED ON THE LAUNCHER AND THE PIPELINE HAS BEEN RESTORED TO SERVICE. ALL WELLS ARE BACK IN SERVICE BUT FACILITY REPAIRS ARE ONGOING. PHMSA WAS NOTIFIED AT 1545 HOURS ON JUNE 6, 2011 AFTER THE VOLUME OF UNINTENTIONAL GAS LOST WAS DETERMINED TO BE GREATER THAN 3 MCF. UPDATE: ALL FACILITY REPAIRS ARE COMPLETED AND ALL INCIDENT GAS VOLUMES AND COSTS UPDATED APPROPRIATELY. FINAL UPDATE: ONLY CHANGE WAS TO MAKE THIS THE FINAL INCIDENT REPORT.