DOMINION TRANSMISSION INC — Gas transmission and gathering — incident on 2004-03-21

Gas transmission and gathering incident in NASHPORT, LICKING County, OH. Reported cause: 20. Reported consequences: 0 fatalities, 0 injuries, $300,000 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: 20040026.

Operator ID: 2714.

Reported incident date: 3/21/2004.

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: DISCHARGE VENT AT NEWARK STATION OPENED AT 7:30 PM ON 03/21/04. IT IS SUSPECTED THAT THE ACTUATOR CAUSED THE 8" DISCHARGE VENT VALVE TO OPEN DUE TO A LEAK AROUND THE SEAT / STEM AREA. NATURAL GAS VENTED FOR 1.5 HOURS. DTI GAS CONTROL WAS ABLE TO ISOLATE GAS VENTING VIA SCADA. APPROXIMATLEY 70 PEOPLE WERE EVACUATED BY THE LOCAL EMA DUE TO SMELL OF NATURAL GAS. THERE WAS NO PROPERTY DAMAGE, INJURIES OR FATALITIES.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: EQUIPMENT FAILURE — MALFUNCTION OF CONTROL/RELIEF EQUIPMENT.

PHMSA indexed costs: $300,000 reported total cost, $178,195.489 in 1984 dollars, $218,796.992 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.