HILAND CRUDE, LLC

Incident Narrative

ON SEPTEMBER 16, 2016 AT APPROXIMATELY 15:20 CST, HILAND CRUDE CONFIRMED A RELEASE OF CRUDE OIL FROM A LEAKING GASKET ON THE AIR ELIMINATOR LOCATED ON THE DORE JUNCTION TO DORE STATION GATHERING LINE AT DORE STATION IN MCKENZIE COUNTY, NORTH DAKOTA. THE A THIRD PARTY WORKING NEAR THE RELEASE LOCATION OBSERVED THE LEAKING GASKET AT APPROXIMATELY 14:56 LOCAL TIME. THEY NOTIFIED THE HILAND CRUDE, LLC CONTROL ROOM IN HOUSTON, TEXAS AT 15:04 LOCAL TIME. HOUSTON CONTROL SHUT-IN THE STATION UPON RECEIVING THE CALL. THE LEAK RESULTED IN APPROXIMATELY FOUR (4) BARRELS OF CRUDE (ESTIMATED) IMPACTING A SMALL AREA OF SOIL ON STATION PROPERTY. THE CRUDE AND IMPACTED SOIL WAS REMOVED FROM THE SITE AND PROPERLY DISPOSED BY CLEAN HARBORS. THE IMPACTED SOIL WAS SENT TO OAKS DISPOSAL SERVICES IN LINDSAY, MONTANA. THE INVESTIGATION OF THE LEAK CITED A LEAKING BUNA RUBBER GASKET. THE BUNA RUBBER GASKET WAS DETERMINED TO BE INCOMPATIBLE WITH AMMONIA SALTS CONTAINED IN THE CRUDE OIL. THE FAILED BUNA RUBBER GASKET WAS REPLACED WITH A VITON GASKET AND RETURNED TO SERVICE. THE CONTROL ROOM DID NOT DETECT THE PRESENCE OF THE RELEASE FROM THE GASKET SINCE IT CONSISTED OF ONLY A FINE MIST. NO PRESSURE LOSS WAS DETECTED BY THE SYSTEM CONTROLLER USING EXISTING PRESSURE MONITORS AND NO VOLUME LOSS WAS OBSERVED BY THE CONTROLLER DUE TO THE LOW VOLUME AND SHORT DURATION OF THE RELEASE.