Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2010-05-06 — MT
Operator
Northwestern Energy Llc
Cause
Locating Issue
Commodity
Natural Gas
Program
GD
Damage and Injuries
1 fatality
0 injuries
Property damage (nominal)
$2,500
Incident datetime
2010-05-06 13:52
Report number
Location
MT
Narrative
**** 6/10/11 **** final report - on may 27 and may 28, 2010 the investigation for this incident was concluded. The investigation determined that gas migrated from the damaged service line to main connection. The gas migrated through the soil along the sewer line to the foundation of the house. Investigation of the service line to main connection verified that the excavator struck the service line and tore the service line off the service at the weld. Nwe considers this incident closed with no further investigation required. Additionally - on the form could not access section g3 - 13a. For this section the service line was removed from service and will not reinstated. **** 06/29/10 worked with DOT to get the report corrected from 06/04/10. After some corrections the form is working and this supplemental is to show those corrections. The service line that was damaged was removed from service, which is shown in part a under 13b as "still shut down". There is no new additional information to include in this report, this is only a corrected supplemental update. **** electric utility excavating for a street light move struck unmarked steel service, which seperated from service tee upstream at main. Gas migrated and accumulated in adjacent residence and exploded. Northwestern energy's address and contanct information in the fron part of this report is not correct. This has been brought to the attention of mtpsc staff joel tierney and PHMSA westen region accident coordinator pete katchmar. The correct corporate address should be 3010 w. 69th street, sioux falls, sd 57108. *** tried to submit on 06/04/2010 at 17:42 could not submitt correctly because of error recieved in part g - specifically g3 requires 13.A if "yes" is selected in 13. Yes is the correct answer, however I did not get a drop down for 13 a. Therefore, I selected "no" and indicated as such here. ****
Detailed record list
Occurred At
2010-05-06 13:52:00
Year
2010
Report Received Date
2010-06-04 00:00:00
Iyear
2010.0
Report Number
20100031.0
Supplemental Number
15263.0
Report Type
Supplemental Final
Operator Id
31632
Name
Northwestern Energy Llc
Operator Street Address
3010 W. 69th St.
Operator City Name
Sioux Falls
Operator State Abbreviation
SD
Operator Postal Code
57108
Local Datetime
2010-05-06 13:52:00
Location Street Address
1206 2nd Ave West
Location City Name
Columbia Falls
Location State Abbreviation
MT
Location Postal Code
59912
Location Latitude
48.36786
Location Longitude
-114.18395
Nrc Rpt Datetime
2010-05-06 17:00:00
Nrc Rpt Num
939397
Commodity Released Type
Natural Gas
Unintentional Release
13.0
Fatality Ind
Yes
Num Emp Fatalities
1
Num Contr Fatalities
0
Num Er Fatalities
0
Num Worker Fatalities
0
Num Gp Fatalities
0
Fatal
1
Injury Ind
No
Injure
0
Ignite Ind
Yes
Explode Ind
Yes
Num Pub Evacuated
0.0
Incident Identified Datetime
2010-05-06 13:52:00
On Site Datetime
2010-05-06 14:20:00
Federal
No
Location Type
Public Property
Incident Area Type
Underground
Incident Area Subtype
Exposed Due To Excavation
Crossing
No
Pipe Facility Type
Privately Owned
System Part Involved
Service
Installation Year
1962.0
Pipe Diameter
0.75
Pipe Specification
Unknown
Pipe Manufacturer
Unknown
Material Involved
Steel
Steel Seam Type
Other
Steel Seam Type Details
Unknown
Wt Steel
0.113
Release Type
Other
Release Type Details
A Backhoe Struck The 3/4" Service Line. Service Line Seperated From The Main At The Service Tee, Which Was Upstream Of The Strike.
Class Location Type
Class 3 Location
Est Cost Oper Paid
200000.0
Est Cost Prop Damage
2500.0
Est Cost Emergency
5000.0
Est Cost Other
0.0
Est Cost Unintentional Release
100.0
Prpty
207600.0
Commercial Affected
0.0
Industrial Affected
0.0
Residences Affected
11.0
Accident Psig
30.0
Normal Psig
30.0
Mop Psig
32.0
Accident Pressure
Pressure Did Not Exceed Maop
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf 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
System pressure remained stable and was not an issue in the incident.
Employee Drug Test Ind
Yes
Num Employees Tested
3
Num Employees Failed
0
Contractor Drug Test Ind
Yes
Num Contractors Tested
1
Num Contractors Failed
0
Cause
Excavation Damage
Cause Details
Excavation Damage By Third Party
Ex Party Type
Excavation Damage By Third Party
Prior Notification Ind
Yes
One Call System Ind
Yes
Notify Cga Dirt
No
Public Row Ind
Yes
Public Subtype
City Street
Excavator Type
Utility
Excavator Equipment
Backhoe/trackhoe
Work Performed
Street Light
One Call Notified Ind
Yes
One Call Ticket Num
2010180256
One Call Center Name
Montana One Call Center
Locator Type
Contract Locator
Visible Marks
Yes
Service Interruption
Yes
Root Cause Category
Locating Issue
Root Cause Type
Facility Not Marked Due To Locator Error
Preparer Name
K**** M*****
Preparer Title
Dot Coordinator
Preparer Email
K***********@n***********.com
Preparer Telephone
4064972214
Preparer Fax
4064972048
Authorizer Name
K**** M*****
Authorizer Title
Dot Coordinator
Authorizer Telephone
4064972214
Authorizer Email
K***********@n***********.com
Narrative
**** 6/10/11 **** final report - on may 27 and may 28, 2010 the investigation for this incident was concluded. The investigation determined that gas migrated from the damaged service line to main connection. The gas migrated through the soil along the sewer line to the foundation of the house. Investigation of the service line to main connection verified that the excavator struck the service line and tore the service line off the service at the weld. Nwe considers this incident closed with no further investigation required. Additionally - on the form could not access section g3 - 13a. For this section the service line was removed from service and will not reinstated. **** 06/29/10 worked with DOT to get the report corrected from 06/04/10. After some corrections the form is working and this supplemental is to show those corrections. The service line that was damaged was removed from service, which is shown in part a under 13b as "still shut down". There is no new additional information to include in this report, this is only a corrected supplemental update. **** electric utility excavating for a street light move struck unmarked steel service, which seperated from service tee upstream at main. Gas migrated and accumulated in adjacent residence and exploded. Northwestern energy's address and contanct information in the fron part of this report is not correct. This has been brought to the attention of mtpsc staff joel tierney and PHMSA westen region accident coordinator pete katchmar. The correct corporate address should be 3010 w. 69th street, sioux falls, sd 57108. *** tried to submit on 06/04/2010 at 17:42 could not submitt correctly because of error recieved in part g - specifically g3 requires 13.A if "yes" is selected in 13. Yes is the correct answer, however I did not get a drop down for 13 a. Therefore, I selected "no" and indicated as such here. ****
| Occurred At | 2010-05-06 13:52:00 |
|---|---|
| Year | 2010 |
| Report Received Date | 2010-06-04 00:00:00 |
| Iyear | 2010.0 |
| Report Number | 20100031.0 |
| Supplemental Number | 15263.0 |
| Report Type | Supplemental Final |
| Operator Id | 31632 PHMSA Enforcement |
| Name | Northwestern Energy Llc |
| Operator Street Address | 3010 W. 69th St. |
| Operator City Name | Sioux Falls |
| Operator State Abbreviation | SD |
| Operator Postal Code | 57108 |
| Local Datetime | 2010-05-06 13:52:00 |
| Location Street Address | 1206 2nd Ave West |
| Location City Name | Columbia Falls |
| Location State Abbreviation | MT |
| Location Postal Code | 59912 |
| Location Latitude | 48.36786 Google Maps OpenStreetMap |
| Location Longitude | -114.18395 Google Maps OpenStreetMap |
| Nrc Rpt Datetime | 2010-05-06 17:00:00 |
| Nrc Rpt Num | 939397 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 13.0 |
| Fatality Ind | Yes |
| Num Emp Fatalities | 1 |
| Num Contr Fatalities | 0 |
| Num Er Fatalities | 0 |
| Num Worker Fatalities | 0 |
| Num Gp Fatalities | 0 |
| Fatal | 1 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | Yes |
| Explode Ind | Yes |
| Num Pub Evacuated | 0.0 |
| Incident Identified Datetime | 2010-05-06 13:52:00 |
| On Site Datetime | 2010-05-06 14:20:00 |
| Federal | No |
| Location Type | Public Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Exposed Due To Excavation |
| Crossing | No |
| Pipe Facility Type | Privately Owned |
| System Part Involved | Service |
| Installation Year | 1962.0 |
| Pipe Diameter | 0.75 |
| Pipe Specification | Unknown |
| Pipe Manufacturer | Unknown |
| Material Involved | Steel |
| Steel Seam Type | Other |
| Steel Seam Type Details | Unknown |
| Wt Steel | 0.113 |
| Release Type | Other |
| Release Type Details | A Backhoe Struck The 3/4" Service Line. Service Line Seperated From The Main At The Service Tee, Which Was Upstream Of The Strike. |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 200000.0 |
| Est Cost Prop Damage | 2500.0 |
| Est Cost Emergency | 5000.0 |
| Est Cost Other | 0.0 |
| Est Cost Unintentional Release | 100.0 |
| Prpty | 207600.0 |
| Commercial Affected | 0.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 11.0 |
| Accident Psig | 30.0 |
| Normal Psig | 30.0 |
| Mop Psig | 32.0 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf 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 | System pressure remained stable and was not an issue in the incident. |
| Employee Drug Test Ind | Yes |
| Num Employees Tested | 3 |
| Num Employees Failed | 0 |
| Contractor Drug Test Ind | Yes |
| Num Contractors Tested | 1 |
| Num Contractors Failed | 0 |
| Cause | Excavation Damage |
| Cause Details | Excavation Damage By Third Party |
| Ex Party Type | Excavation Damage By Third Party |
| Prior Notification Ind | Yes |
| One Call System Ind | Yes |
| Notify Cga Dirt | No |
| Public Row Ind | Yes |
| Public Subtype | City Street |
| Excavator Type | Utility |
| Excavator Equipment | Backhoe/trackhoe |
| Work Performed | Street Light |
| One Call Notified Ind | Yes |
| One Call Ticket Num | 2010180256 |
| One Call Center Name | Montana One Call Center |
| Locator Type | Contract Locator |
| Visible Marks | Yes |
| Service Interruption | Yes |
| Root Cause Category | Locating Issue |
| Root Cause Type | Facility Not Marked Due To Locator Error |
| Preparer Name | K**** M***** |
| Preparer Title | Dot Coordinator |
| Preparer Email | K***********@n***********.com |
| Preparer Telephone | 4064972214 |
| Preparer Fax | 4064972048 |
| Authorizer Name | K**** M***** |
| Authorizer Title | Dot Coordinator |
| Authorizer Telephone | 4064972214 |
| Authorizer Email | K***********@n***********.com |
| Narrative | **** 6/10/11 **** final report - on may 27 and may 28, 2010 the investigation for this incident was concluded. The investigation determined that gas migrated from the damaged service line to main connection. The gas migrated through the soil along the sewer line to the foundation of the house. Investigation of the service line to main connection verified that the excavator struck the service line and tore the service line off the service at the weld. Nwe considers this incident closed with no further investigation required. Additionally - on the form could not access section g3 - 13a. For this section the service line was removed from service and will not reinstated. **** 06/29/10 worked with DOT to get the report corrected from 06/04/10. After some corrections the form is working and this supplemental is to show those corrections. The service line that was damaged was removed from service, which is shown in part a under 13b as "still shut down". There is no new additional information to include in this report, this is only a corrected supplemental update. **** electric utility excavating for a street light move struck unmarked steel service, which seperated from service tee upstream at main. Gas migrated and accumulated in adjacent residence and exploded. Northwestern energy's address and contanct information in the fron part of this report is not correct. This has been brought to the attention of mtpsc staff joel tierney and PHMSA westen region accident coordinator pete katchmar. The correct corporate address should be 3010 w. 69th street, sioux falls, sd 57108. *** tried to submit on 06/04/2010 at 17:42 could not submitt correctly because of error recieved in part g - specifically g3 requires 13.A if "yes" is selected in 13. Yes is the correct answer, however I did not get a drop down for 13 a. Therefore, I selected "no" and indicated as such here. **** |
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