ONEOK FIELD SERVICES COMPANY, L.L.C. — Gas transmission and gathering — incident on 2016-01-13

Gas transmission and gathering incident in EL RENO, CANADIAN County, OK. Reported cause: CORROSION FAILURE. Reported consequences: 0 fatalities, 0 injuries, 5 NATURAL GAS released, $170,503 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: 20160016.

Operator ID: 30629.

Reported incident date: 1/13/2016 13:15.

Location detail: 4 MILE CREEK

Cause detail: INTERNAL CORROSION

Cause detail: CITY OF EL RENO OKLAHOMA EMPLOYEE CONTACTED ONEGAS EMPLOYEE OF POSSIBLE LEAK AT ADAMS PARK ONEGAS EMPLOYEE NOTIFIED ONEOK FIELD SERVICES PIPELINE CONTROL 01/13/2016 13:14 OFS PIPELINE CONTROL CONTACTED FIELD PERSONNEL 01/13/2016 13:15 OFS FIELD PERSONNEL ARRIVED ON SITE AND ISOLATED EFFECTED SEGMENT OF PIPE 01/13/2016 14:30 02/26/2016 PROPERTY DAMAGE ESTIMATES HAVE EXCEEDED $50,000 01/13/2016 NRC #1137973 WAS MADE DUE TO OKLAHOMA CORPORATION COMMISSION OIL & GAS DIVISION PETROLEUM PRODUCTS RELEASE REQUIREMENTS 04/05/2016 UPDATED PROPERTY DAMAGES (D7B) AND CHANGED TIME THAT OFS FIELD PERSONNEL ARRIVED ON SITE AND ISOLATED EFFECTED SEGMENT OF PIPE TO 14:30 FINAL REPORT SUBMITTED

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: CORROSION — INTERNAL.

PHMSA indexed costs: $170,527 reported total cost, $84,858.285 in 1984 dollars, $208,948.285 in current-year dollars.

PHMSA trend flags, standardized causes, and indexed costs are analytical fields added to operator-reported incident data. They do not represent final agency causal findings.