GREYLOCK MIDSTREAM, LLC

Incident Narrative

AT AROUND 10AM ON 8/29/2018 GREYLOCK EMPLOYEES ARRIVED ONSITE AND FOUND THAT GAS WAS VENTING TO THE FLUID TANK FROM THE FILTER SEPARATOR. UPON INVESTIGATION ONE OF THE DUMP VALVES ON THE FILTER SEPARATOR WAS FOUND TO BE STUCK IN THE OPEN POSITION. A MANUAL VALVE WAS SHUT TO STOP TO THE FLOW OF GAS TO THE TANK AND TO ISOLATE THE DUMP VALVE. THE DUMP VALVE ADJUSTMENT SCREW WAS ADJUSTED AND THE VALVE STARTED OPENING AND CLOSING PROPERLY. A VENT LINE UPSTREAM OF THE DUMP VALVES WAS OPENED TO TRY AND BLOW AND DEBRIS OUT OF THE LINE THAT MAY HAS CAUSED TO DUMP VALVE TO GET STUCK IN THE OPEN POSITION. THE VALVE WAS THEN TURNED BACK INLINE. AT THE TIME OF THE INCIDENT GREYLOCK WAS UNAWARE OF HOW MUCH GAS VENTED OR FOR HOW LONG IT HAD BEEN VENTING AND COULD NOT CONFIRM AN INCIDENT HAD OCCURRED UNTIL FURTHER INVESTIGATION. ON 8/30/2018 AT AROUND 3:50PM FACILITIES RECEIVED AN EMAIL FROM THE MARKETING GROUP SHOWING THAT GREYLOCK HAD VENTED APPROXIMATELY 3646 MSCF OF GAS CONFIRMING AN INCIDENT HAD OCCURRED. AT THAT TIME A TELEPHONIC NOTICE WAS MADE TO PHMSA AT APPROXIMATELY 4:15PM. IN ORDER TO PREVENT REOCCURRENCE GREYLOCK OPENED UP THE FILTER SEPARATOR AND CLEANED THE FILTER OF BLACK/DARK GREY SEDIMENT THAT HAD COLLECTED IN THE FILTER SEPARATOR. GREYLOCK ALSO REPLACED THE OLD FILTERS AND INSTALLED NEW CLEAN FILTERS AND BLEW OUT DUMP LINES. GREYLOCK HAS ALSO SCHEDULED A TRAINING WITH THE MANUFACTURER AND IS WORKING ON A MAINTENANCE PROCEDURE FOR THE FILTER SEPARATORS.