Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2023-02-01 — CA
Operator
Pacific Gas & Electric Co
Cause
Natural Force Damage
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$13,571
Incident datetime
2023-02-01 00:00 UTC
Report number
Location
CA, CONTRA COSTA
Narrative
On january 6, 2023, at 09:50, pg&e incident on-call personnel confirmed extent of condition of an unintentional release of gas due to a completely severed pipe. On january 5, at approximately 06:22, a 4" steel main near our facilities in san pablo broke as a result of natural force damage, earth movement due to heavy rain, resulting in a gas leak. Pg&e crews conducted repairs. This section of main crosses the hayward fault line, and geosciences examined the area. After their inspection it was determined that creep has loaded the pipe since it was installed. Based on a nearby usgs monitoring station, the area where the failure occurred creeps at a rate of about 5 mm/year. The pipe ruptured at a partial penetration girth weld. The orientation of the pipe relative to the fault and the sense of movement on the fault causes the pipe to be loaded in extension, which is consistent with the separation of the pipe that was observed at the break. Given that no other breaks occurred where distribution mains in the area intersect the hayward fault, pg&e concludes that the break was due to a combination of heavy rain fall and long-term creep loading. A detailed assessment of historical leaks in the area did not show a correlation between leaks in the area and the hayward fault. No media was reported onsite. The fire department and police were onsite. No fatalities or injuries were reported. Three homes were evacuated, and gas service was interrupted for eight customers as part of the isolation strategy. This incident was reported to DOT (nrc #1356987/ 1357066) and cpuc once it was confirmed that the unintended gas loss was over 3 million cubic feet.
Detailed record list
Report Received Date
2023-02-01 00:00:00
Iyear
2023.0
Report Number
20230006.0
Supplemental Number
37843.0
Report Type
Supplemental Final
Operator Id
15007
Name
Pacific Gas & Electric Co
Operator Street Address
6121 Bollinger Canyon Rd.
Operator City Name
San Ramon
Operator State Abbreviation
CA
Operator Postal Code
94583.0
Time Zone
Pacific
Daylight Savings Ind
No
Location Street Address
2761 Rollingwood Drive
Location City Name
San Pablo
Location County Name
Contra Costa
Location State Abbreviation
CA
Location Postal Code
94806.0
Location Latitude
37.965508
Location Longitude
-122.334511
Flow Cont Squeeze Off Ind
Yes
Nrc Rpt Num
1356987.0
Additional Nrc Report Numbers
1357066.0
Commodity Released Type
Natural Gas
Unintentional Release
5358.0
Intentional Release
0.0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
No
Num Pub Evacuated
3.0
Federal
No
Location Type
Public Property
Incident Area Type
Underground
Incident Area Subtype
Under Pavement
Depth Of Cover
30.0
Other Underground Facilities
No
Crossing
No
Pipe Facility Type
Privately Owned
System Part Involved
Main
Installation Year
1943.0
Pipe Diameter
4.0
Pipe Specification
Unknown
Pipe Manufacturer
Unknown
Material Involved
Steel
Steel Seam Type
Other
Steel Seam Type Details
Unknown
Release Type
Rupture
Rupture Orient
Circumferential
Rupture Length
4
Rupture Width
4
Class Location Type
Class 3 Location
Est Cost Oper Paid
0.0
Est Cost Prop Damage
13571.0
Est Cost Emergency
596.0
Est Cost Other
0.0
Gas Cost In Mcf
6.0
Est Cost Unintentional Release
32148.0
Est Cost Intentional Release
0.0
Prpty
46315.0
Commercial Affected
0.0
Industrial Affected
0.0
Residences Affected
8.0
Num Persons Hosp Not Ovnght
0.0
Num Injured Treated By Emt
0.0
Num Resident Building Affctd
8.0
Num Business Building Affctd
0.0
Accident Psig
54.0
Normal Psig
54.0
Mop Psig
60.0
Mop Cfr Section
192.619(A)(3)
Maop Established Date
1966-01-01 00:00:00
Accident Pressure
Pressure Did Not Exceed Maop
Gas Odorized System Type
Odorized By Others
Gas Odorized Lvl Not Msrd Ind
Yes
Scada In Place Ind
No
Accident Identifier
Notification From Emergency Responder
Investigation Status
No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate)
Investigation Status Details
Pipe ruptured as a result of natural force damage, earth movement due to heavy rain.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Natural Force Damage
Cause Details
Heavy Rains/floods
Natural Force Type
Heavy Rains/floods
Heavy Rains Subtype
Washouts/scouring
Nf Extreme Weather Ind
Yes
Nf Other Ind
Yes
Nf Extreme Weather Details
Heavy Rain (Bomb Cyclone + Atmospheric River)
Preparer Name
R*** D*****
Preparer Title
Gas Program Manager
Preparer Email
R***@p**.com
Preparer Telephone
510/298-7063
Authorizer Name
S**** R*******
Authorizer Title
Gas Regulatory Compliance Manager
Authorizer Telephone
925/786-0267
Authorizer Email
Gsr8
Narrative
On january 6, 2023, at 09:50, pg&e incident on-call personnel confirmed extent of condition of an unintentional release of gas due to a completely severed pipe. On january 5, at approximately 06:22, a 4" steel main near our facilities in san pablo broke as a result of natural force damage, earth movement due to heavy rain, resulting in a gas leak. Pg&e crews conducted repairs. This section of main crosses the hayward fault line, and geosciences examined the area. After their inspection it was determined that creep has loaded the pipe since it was installed. Based on a nearby usgs monitoring station, the area where the failure occurred creeps at a rate of about 5 mm/year. The pipe ruptured at a partial penetration girth weld. The orientation of the pipe relative to the fault and the sense of movement on the fault causes the pipe to be loaded in extension, which is consistent with the separation of the pipe that was observed at the break. Given that no other breaks occurred where distribution mains in the area intersect the hayward fault, pg&e concludes that the break was due to a combination of heavy rain fall and long-term creep loading. A detailed assessment of historical leaks in the area did not show a correlation between leaks in the area and the hayward fault. No media was reported onsite. The fire department and police were onsite. No fatalities or injuries were reported. Three homes were evacuated, and gas service was interrupted for eight customers as part of the isolation strategy. This incident was reported to DOT (nrc #1356987/ 1357066) and cpuc once it was confirmed that the unintended gas loss was over 3 million cubic feet.
| Report Received Date | 2023-02-01 00:00:00 |
|---|---|
| Iyear | 2023.0 |
| Report Number | 20230006.0 |
| Supplemental Number | 37843.0 |
| Report Type | Supplemental Final |
| Operator Id | 15007 PHMSA Enforcement |
| Name | Pacific Gas & Electric Co |
| Operator Street Address | 6121 Bollinger Canyon Rd. |
| Operator City Name | San Ramon |
| Operator State Abbreviation | CA |
| Operator Postal Code | 94583.0 |
| Time Zone | Pacific |
| Daylight Savings Ind | No |
| Location Street Address | 2761 Rollingwood Drive |
| Location City Name | San Pablo |
| Location County Name | Contra Costa |
| Location State Abbreviation | CA |
| Location Postal Code | 94806.0 |
| Location Latitude | 37.965508 Google Maps OpenStreetMap |
| Location Longitude | -122.334511 Google Maps OpenStreetMap |
| Flow Cont Squeeze Off Ind | Yes |
| Nrc Rpt Num | 1356987.0 NRC Report How to search |
| Additional Nrc Report Numbers | 1357066.0 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 5358.0 |
| Intentional Release | 0.0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | No |
| Num Pub Evacuated | 3.0 |
| Federal | No |
| Location Type | Public Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Pavement |
| Depth Of Cover | 30.0 |
| Other Underground Facilities | No |
| Crossing | No |
| Pipe Facility Type | Privately Owned |
| System Part Involved | Main |
| Installation Year | 1943.0 |
| Pipe Diameter | 4.0 |
| Pipe Specification | Unknown |
| Pipe Manufacturer | Unknown |
| Material Involved | Steel |
| Steel Seam Type | Other |
| Steel Seam Type Details | Unknown |
| Release Type | Rupture |
| Rupture Orient | Circumferential |
| Rupture Length | 4 |
| Rupture Width | 4 |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 0.0 |
| Est Cost Prop Damage | 13571.0 |
| Est Cost Emergency | 596.0 |
| Est Cost Other | 0.0 |
| Gas Cost In Mcf | 6.0 |
| Est Cost Unintentional Release | 32148.0 |
| Est Cost Intentional Release | 0.0 |
| Prpty | 46315.0 |
| Commercial Affected | 0.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 8.0 |
| Num Persons Hosp Not Ovnght | 0.0 |
| Num Injured Treated By Emt | 0.0 |
| Num Resident Building Affctd | 8.0 |
| Num Business Building Affctd | 0.0 |
| Accident Psig | 54.0 |
| Normal Psig | 54.0 |
| Mop Psig | 60.0 |
| Mop Cfr Section | 192.619(A)(3) View CFR 49 §192 |
| Maop Established Date | 1966-01-01 00:00:00 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Gas Odorized System Type | Odorized By Others |
| Gas Odorized Lvl Not Msrd Ind | Yes |
| Scada In Place Ind | No |
| Accident Identifier | Notification From Emergency Responder |
| Investigation Status | No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate) |
| Investigation Status Details | Pipe ruptured as a result of natural force damage, earth movement due to heavy rain. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Natural Force Damage |
| Cause Details | Heavy Rains/floods |
| Natural Force Type | Heavy Rains/floods |
| Heavy Rains Subtype | Washouts/scouring |
| Nf Extreme Weather Ind | Yes |
| Nf Other Ind | Yes |
| Nf Extreme Weather Details | Heavy Rain (Bomb Cyclone + Atmospheric River) |
| Preparer Name | R*** D***** |
| Preparer Title | Gas Program Manager |
| Preparer Email | R***@p**.com |
| Preparer Telephone | 510/298-7063 |
| Authorizer Name | S**** R******* |
| Authorizer Title | Gas Regulatory Compliance Manager |
| Authorizer Telephone | 925/786-0267 |
| Authorizer Email | Gsr8 |
| Narrative | On january 6, 2023, at 09:50, pg&e incident on-call personnel confirmed extent of condition of an unintentional release of gas due to a completely severed pipe. On january 5, at approximately 06:22, a 4" steel main near our facilities in san pablo broke as a result of natural force damage, earth movement due to heavy rain, resulting in a gas leak. Pg&e crews conducted repairs. This section of main crosses the hayward fault line, and geosciences examined the area. After their inspection it was determined that creep has loaded the pipe since it was installed. Based on a nearby usgs monitoring station, the area where the failure occurred creeps at a rate of about 5 mm/year. The pipe ruptured at a partial penetration girth weld. The orientation of the pipe relative to the fault and the sense of movement on the fault causes the pipe to be loaded in extension, which is consistent with the separation of the pipe that was observed at the break. Given that no other breaks occurred where distribution mains in the area intersect the hayward fault, pg&e concludes that the break was due to a combination of heavy rain fall and long-term creep loading. A detailed assessment of historical leaks in the area did not show a correlation between leaks in the area and the hayward fault. No media was reported onsite. The fire department and police were onsite. No fatalities or injuries were reported. Three homes were evacuated, and gas service was interrupted for eight customers as part of the isolation strategy. This incident was reported to DOT (nrc #1356987/ 1357066) and cpuc once it was confirmed that the unintended gas loss was over 3 million cubic feet. |
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