TC OIL PIPELINE OPERATIONS INC — Hazardous liquid — incident on 2017-11-16

Hazardous liquid incident in Not Within a Municipality, MARSHALL COUNTY County, SD. Reported cause: MATERIAL FAILURE OF PIPE OR WELD. Reported consequences: 0 fatalities, 0 injuries, 6592 CRUDE OIL released, $5,682,477 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: 20170417.

Operator ID: 32334.

Reported incident date: 11/16/2017 5:33.

Location detail: MP 234.3

Cause detail: DESIGN-, CONSTRUCTION-, INSTALLATION-, OR FABRICATION-RELATED

Cause detail: ON 16 NOV, 2017, AT 05:34 CST, A PRESSURE DROP WAS EXPERIENCED ON KEYSTONE APPROXIMATELY 17.4 MILES DOWNSTREAM OF LUDDEN PUMP STATION, RESULTING IN THE PIPELINE BEING SHUT DOWN. AT 09:15, TECHNICIANS CONFIRMED OIL ON THE GROUND. AT 10:13 CST, THE NRC WAS CALLED, AND A REPORT GENERATED (1197446) AND DISTRIBUTED AT 10:26. CONTACT WITH PHMSA ACCIDENT INVESTIGATION DIVISION MADE AT 1025; PHMSA ON SITE FROM 17 TO 28 NOV. PIPELINE WAS SUBSEQUENTLY RESTARTED ON 29 NOV AFTER REPLACEMENT OF FAILED SECTION. METALLURGICAL TESTING BEING PERFORMED BY THE NATIONAL TRANSPORTATION SAFETY BOARD; RESULTS PENDING. REGARDING PART D, 1A., THERE ONE BIRD AND ONE RACCOON WERE LOST. 20180315 SUPPLEMENTAL REPORT: UPDATED COMMODITY RELEASED AND RECOVERED, COSTS ASSOCIATED WITH THE ACCIDENT, AND CAUSE OF THE FAILURE (SECOND PARTY DAMAGE) AS DERIVED FROM THE NATIONAL TRANSPORTATION SAFETY BOARD (NTSB) DRAFT METALLURGIC REPORT, AND CONFIRMED BY A MUTUALLY AGREED UPON THIRD PARTY CONTRACTOR, KEIFNER AND ASSOCIATES. 20180810 SUPPLEMENTAL REPORT: FINAL COSTS RECEIVED AND VETTED THROUGH LEADERSHIP ON 20180724, WITH APPROVAL ON 20180801. 20180822 - UPDATED PART G APPARENT CAUSE TO A G5 FROM A G8, AND PART E FOR CONTROLLER INVESTIGATION. 20181109 - UPDATED PART A VOLUME RELEASED TO 6,592 BBLS; VOLUME DERIVED THROUGH PIPE INTEGRITY CALCULATION BASED ON EXACT LOCATION, DEPTH OF COVER, ACTUAL SHUTDOWN TIMES, AND POSITION OF THE RUPTURE.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: MATERIAL FAILURE OF PIPE OR WELD — CONSTRUCTION, INSTALLATION OR FABRICATION-RELATED.

PHMSA indexed costs: $44,809,560 reported total cost, $21,903,661.487 in 1984 dollars, $53,941,977.054 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.