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PACIFIC GAS & ELECTRIC CO

gas_transmission Incident —

Incident Information

Report Date—
OperatorPACIFIC GAS & ELECTRIC CO
Commodity—
Pipeline Typegas_transmission

Location

State
Coordinates39.36946, -123.23937

Cause

CauseMATERIAL FAILURE OF PIPE OR WELD
Subcause—

Casualties

Fatalities0
Injuries0

Costs

Property Damage—
Lost Commodity—
Public/Private Damage—
Emergency Response—
Environmental Remediation—
Other Costs—

Location Map

Incident Narrative

ON TUESDAY, FEBRUARY 28, 2017, AT 1059 HOURS, PG&E WAS NOTIFIED OF A GAS ODOR NEAR 16500 TOMKI ROAD, REDWOOD VALLEY. PG&ES GAS SERVICE REPRESENTATIVE (GSR) WAS ON SITE APPROXIMATELY AT 1127 HOURS. THE GSR MEASURED 20% GAS IN AIR AT THE LOCATION. PG&E CREWS ARRIVED ON-SITE AND CLASSIFIED THE LEAK AS GRADE 1. THE LEAK WAS ALONG LINE 21E AT MILE POINT (MP) 130. THE OPERATING PRESSURE OF THE SYSTEM WAS LOWERED FROM 400 TO 240 PSIG. LNG WAS USED FOR SUPPORT. ON 3/3/17, THE LEAK WAS EXCAVATED AND THE SOURCE OF LEAK WAS DETERMINED. THE CLEARANCE WAS EXECUTED ON 3/3/17 BY 0800 HOURS TO ISOLATE THE LEAK. THE LEAK WAS CONTINUOUSLY MONITORED UNTIL THE REPAIRS WERE COMPLETED. FOLLOWING THE REPAIR OF THIS LEAK, THE PIPE WAS CUT OUT AND METALLURGICAL TESTING WAS PERFORMED. THE DIRECT CAUSE OF THE LEAK WAS DETERMINED TO BE NEAR NEUTRAL PH (NNPH) SCC IN THE CIRCUMFERENTIAL DIRECTION. THIS SECTION OF PIPE WAS LOCATED IN A GEOLOGICALLY UNSTABLE AREA WITH A HISTORY OF LANDSLIDES. APPROXIMATELY 100 FEET OF PIPE WAS REPLACED AND THE SYSTEM WAS RESTORED TO NORMAL OPERATIONS ON 3/14/17 BY 0100 HOURS. THERE WAS NO CUSTOMER IMPACT. THERE WERE NO INJURIES OR FATALITIES REPORTED. THERE WAS NO MEDIA, POLICE OR FIRE DEPARTMENT REPORTED. THIS INCIDENT WAS REPORTED TO THE DOT AND CPUC ONCE IT WAS DETERMINED THAT REPAIRS TO GAS FACILITIES WOULD EXCEED $50,000 ON 2/28/17 AT APPROXIMATELY 1700 HOURS.

About This Pipeline Incident

Pipeline incident data is reported to the Pipeline and Hazardous Materials Safety Administration (PHMSA). All significant incidents involving fatalities, injuries, or property damage over $50,000 must be reported.

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