DOMINION ENERGY OHIO — Gas transmission and gathering — incident on 2018-04-16

Gas transmission and gathering incident in MADISON, LAKE County, OH. Reported cause: EXCAVATION DAMAGE. Reported consequences: 0 fatalities, 0 injuries, 2119 NATURAL GAS released, $56,130 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: 20190076.

Operator ID: 4060.

Reported incident date: 4/16/2018 8:00.

Location detail: L#298

Cause detail: EXCAVATION DAMAGE BY THIRD PARTY

Cause detail: EXCAVATION ISSUE

Cause detail: EXCAVATOR FAILED TO MAINTAIN CLEARANCE AFTER VERIFYING MARKS

Cause detail: A CONTRACTOR INSTALLING A WATER MAIN DROVE A TRENCH BOX INTO A DOMINION ENERGY OHIO TRANSMISSION LINE L#298. THE CONTRACTOR WAS INFORMED OF THE SAFE DIGGING REQUIREMENTS, BUT FAILED TO CONTACT THE COMPANY OR CONTRACTED LOCATING SERVICE WHEN EXCAVATING WITHIN 10 FEET OF THE TRANSMISSION LINE. AN RCA WAS CONDUCTED AND FOUND THE ROOT CAUSE TO BE A FAILURE TO MAINTAIN CLEARANCE BETWEEN POWERED EQUIPMENT AND UNDERGROUND FACILITIES. THIS INCIDENT WAS FOUND UNREPORTED DURING A PUCO PIPELINE SAFETY INSPECTION. THE REASON WAS DUE TO THE $50,000 THRESHOLD EXCEEDANCE FROM CONTRACTOR REPAIR COSTS INCURRED AFTER THE EVENT, BUT NOT CORRECTLY TRACKED FOR REPORTING REQUIREMENTS. DOMINION ENERGY OHIO HELD AN INTERNAL MEETING TO ADDRESS THIS ISSUE AND IMPLEMENTED MEASURES TO ENSURE FUTURE REPORTING IS NOT MISSED AGAIN.

PHMSA trend classification: not significant, not serious.

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

PHMSA indexed costs: $65,725 reported total cost, $33,503.833 in 1984 dollars, $77,181.131 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.