CHEVRON PIPE LINE CO

Incident Narrative

AT APPROX. 1848 CST ON 21DEC21, CC WAS NOTIFIED BY A THIRD-PARTY CITIZEN OF POTENTIAL VAPORS IN THE VICINITY OF THE CPCHEM ROW NEAR LABELLE RD. IT WAS REPORTED THAT THE LOCAL FIRE DEPARTMENT WAS RESPONDING AND AT THAT TIME, CC DISPATCHED CHEVRON FIELD PERSONNEL TO THE AREA TO INVESTIGATE. UPON ARRIVAL, ETHYLENE VAPORS WERE DETECTED IN THE ROW AND COULD BE SMELLED IN THE AIR. THE FIRE DEPARTMENT PROCEEDED TO CLOSE LABELLE RD, IN BOTH DIRECTIONS, TO ANY ONCOMING TRAFFIC. A 1-MILE EXCLUSION ZONE WAS PLACED AROUND THE POTENTIAL LEAK AREA AND JEFFERSON COUNTY ISSUED A SHELTER-IN-PLACE TO LOCAL RESIDENCE. CHEVRONS CONTRACTED AIR MONITORING GROUP ARRIVED ON SCENE AT APPROX. 0045 CST ON 22DEC21 TO INITIATE MONITORING. FIELD PERSONNEL CONFIRMED A POTENTIAL RELEASE APPROXIMATELY 100-150 YARDS WEST OF LABELLE RD. THE CC HAS YET TO DETECT A LOSS OF PRESSURE BUT ARE CURRENTLY WORKING WITH FIELD OPERATIONS TO REDIRECT THE FLOW TO ISOLATE THE LINE. AT APPROX. 1100 CST ON 22DEC21, MULTIPLE SAMPLES WERE TAKEN WITH CONFIRMATION OF THE SOURCE OF THE RELEASE NEAR THE 8-INCH FRIO LINE. CC BEGAN DECOMMISSIONING THE ENTIRE SEGMENT IMPACTED. THE SITE IS SECURE AND THIRD-PARTY AIR MONITORING IS ONGOING. THE 1-MILE EXCLUSION ZONE AND JEFFERSON COUNTY SHELTER-IN-PLACE IS STILL IN EFFECT. AT THIS TIME CPP HAS ESTIMATED 2,603 LBS (1,449 GALLONS) OF PP MIX AND ETHYLENE WERE RELEASED TO THE ATMOSPHERE OVER A PERIOD OF 18 HOURS. PLANS FOR REPAIR AND COMMISSIONING ARE BEING DEVELOPED. AT APPROX. 1800 CST ON 22DEC21, THE SHELTER-IN-PLACE AND ROAD CLOSURE OF LABELLE RD, WERE LIFTED BY THE LOCAL FIRE DEPARTMENT. THIRD-PARTY AIR MONITORING CONTINUED UNTIL APPROX. 2000 CST ON 22DEC21. THE FRIO PIPELINE SEGMENT HAS BEEN FULLY DISPLACED IN THE AREA AND EFFORTS OF REPAIRS ARE ONGOING. AT APPROX. 1300 CST ON 23DEC21, IT WAS DETERMINED THAT CPP PERSONNEL WILL ACCESS THE SITE AND EXCAVATE THE AREA OF THE SOURCE OF RELEASE TO INITIATE REPAIRS AND INVESTIGATE CAUSE OF THE RELEASE. THE NRC 48HR UPDATE WAS CONDUCTED @ 1749 CST ON 23DEC21 AND ISSUED REPORT #1325176. APPARENT CAUSE OF RELEASE WAS POROSITY AT WELD. THIS REPAIR WAS COMPLETED ON DECEMBER 23RD AND RETURNED TO PRODUCTION.