MPLX LP — Hazardous liquid gravity and reporting-regulated-only — incident on 2023-11-02

Hazardous liquid gravity and reporting-regulated-only incident in KINGFISHER, KINGFISHER County, OK. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 818 CRUDE OIL released, $500,000 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings.

Report number: 20230099.

Operator ID: 40149.

Reported incident date: 11/2/2023 19:00.

Cause detail: INTERNAL CORROSION

Cause detail: ON 11/02/2023 AT 19:00 CT., A LANDOWNER CONTACTED AN MPLX LAND AGENT ABOUT A POSSIBLE CRUDE OIL LEAK ON HIS PROPERTY APPROXIMATELY 1\4 MILE NW OF HELEN COMPRESSOR STATION. THE LAND AGENT IMMEDIATELY CONTACTED THE LOCAL AREA SUPERVISION, WHO DISPATCHED AN OPERATOR TO CONFIRM THE LEAK. ONCE THE OPERATOR CONFIRMED THE LEAK AT 20:12, THE OPERATIONS SUPERVISOR INITIATED A MAPLINE CALL. ADDITIONAL PERSONNEL WERE CALLED OUT TO SHUT DOWN THE WELLS FLOWING INTO THE PIPELINE AND ISOLATE THE LEAK. THE PIPELINE WAS SHUT DOWN AT 22:53. THE LEAK WAS INTERNAL CORROSION LOCATED AT THE 6:00 O'CLOCK POSITION. ON 11/06/2023 THE PIPE SEGMENT WAS CUT OUT AND REPLACED. ON 11/07/2023, THE PIPELINE WAS PUT BACK INTO SERVICE. EXCAVATION OF IMPACTED SOIL HAS BEEN ONGOING. HEAVILY IMPACTED SOIL IS BEING DISPOSED OF, HOWEVER SOIL SHREDDING IS BEING CONDUCTED AS WELL TO BRING TPH LEVELS BELOW THE ESTABLISHED STANDARDS. DEWATERING AND PRODUCT REMOVAL HAVE BEEN ONGOING WITHIN THE EXCAVATION. THE REMEDIATION PLAN FOR THE IMMEDIATE FUTURE IS TO REMOVE, TREAT, AND SHRED THE TOP 3' OF THE DELINEATED IMPACT ZONE. GROUNDWATER MONITORING WELLS WILL BE PLACED AT POSITIONS TO BEST EFFECT RECOVERY AND ASCERTAIN IMPACT CLEARANCE.