NORTHERN NATURAL GAS CO — Gas transmission and gathering — incident on 2016-05-06

Gas transmission and gathering incident in Not Within a Municipality, SIOUX County, IA. Reported cause: EXCAVATION DAMAGE. Reported consequences: 0 fatalities, 0 injuries, 340 NATURAL GAS released, $19,915 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: 20160045.

Operator ID: 13750.

Reported incident date: 5/6/2016 18:30.

Location detail: MILE POST 3.9

Cause detail: EXCAVATION DAMAGE BY THIRD PARTY

Cause detail: NOTIFICATION ISSUE

Cause detail: NO NOTIFICATION MADE TO THE ONE-CALL CENTER/811

Cause detail: ON MAY 6, 2016 AT 18:33 SCOTT DOORENBOS NOTIFIED NORTHERN'S OPERATIONS COMMUNICATION CENTER (OCC) THAT HE HAD STRUCK AND COMPLETELY SEVERED THE 2-INCH BOYDEN, IOWA (IAB66701) BRANCH LINE NEAR THE INTERSECTION OF 330TH AND JACKSON AVENUE. THE APPROXIMATE MILE POST ON THE PIPELINE IS 3.91. DOORENBOS WAS INSTALLING AGRICULTURAL DRAIN TILE WITHOUT MAKING A ONE-CALL. SERVICE TO THE TOWN OF BOYDEN WAS COMPLETELY LOST. APPROXIMATELY 60-FEET OF 2-INCH PIPE WAS REPLACED AND SERVICE TO THE TOWN OF BOYDEN WAS RESTORED. MIDAMERICAN ENERGY ESTIMATED THAT 276 CUSTOMERS WOULD NEED A RELIGHT.

PHMSA trend classification: not significant, not serious.

PHMSA standardized cause: EXCAVATION DAMAGE — THIRD PARTY EXCAVATION DAMAGE.

PHMSA indexed costs: $58,990 reported total cost, $29,713.09 in 1984 dollars, $72,332.77 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.