Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2021-11-29 — SD
Operator
Montana - Dakota Utilities Co
Cause
Notification Issue
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$8,000
Incident datetime
2021-11-29 10:27
Report number
Location
SD, PENNINGTON
Narrative
On november 29, 2021 at 9:22 a.M. Mst, an excavator notified montana-dakota utilities co. (mdu) that they damaged a 1" main near 920 11th street, rapid city, south dakota. An mdu first responder arrived at 10:27 a.M. Mst and after checking in with local fire department personnel on scene, began investigating. While the mdu emergency responders were working to secure the damage, the leaking natural gas caused by the excavation damage migrated and subsequently ignited causing an explosion and a fire at 920 11th street. An mdu crew excavated and squeezed the 2" steel main upstream of the damaged 1" main. The investigation determined the third-party excavator locate ticket expired prior to commencing work on the date of the incident.
Detailed record list
Occurred At
2021-11-29 10:27:00
Year
2021
Report Received Date
2021-12-22 00:00:00
Iyear
2021.0
Report Number
20210104.0
Supplemental Number
36172.0
Report Type
Original Final
Operator Id
12684
Name
Montana - Dakota Utilities Co
Operator Street Address
400 North Fourth Street
Operator City Name
Bismarck
Operator State Abbreviation
ND
Operator Postal Code
58501
Local Datetime
2021-11-29 11:00:00
Time Zone
Mountain
Daylight Savings Ind
No
Location Street Address
920 11th Street
Location City Name
Rapid City
Location County Name
Pennington
Location State Abbreviation
SD
Location Postal Code
57701
Location Latitude
44.07769794
Location Longitude
-103.237473
Flow Cont Squeeze Off Ind
Yes
Nrc Rpt Datetime
2021-11-29 11:28:00
Nrc Rpt Num
1323119
Additional Nrc Report Numbers
1323315
Commodity Released Type
Natural Gas
Unintentional Release
46.28
Intentional Release
0.0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
Yes
Ignite Datetime
2021-11-29 11:00:00
How Extinguished
Allowed To Burn Out
Gas Consumed By Fire In Mcf
10.85
Explode Ind
Yes
Num Pub Evacuated
4.0
Incident Identified Datetime
2021-11-29 10:27:00
Communication State Fed Ind
Yes
Party Initiated Communication
Operator
Initial Responder Com Datetime
2021-11-29 10:27:00
On Site Datetime
2021-11-29 10:27:00
Federal
No
Location Type
Private Property
Incident Area Type
Underground
Incident Area Subtype
Other
Incident Area Details
Inside Residential Structure.
Depth Of Cover
30.0
Other Underground Facilities
No
Crossing
No
Pipe Facility Type
Investor Owned
System Part Involved
Main
Installation Year
1967.0
Pipe Diameter
1.0
Pipe Specification
Unknown
Pipe Manufacturer
Unknown
Material Involved
Steel
Steel Seam Type
Longitudinal Erw - Unknown Frequency
Release Type
Other
Release Type Details
Third Party Damage Pulled Distribution Main Apart At An Elbow Fitting Connection.
Class Location Type
Class 3 Location
Est Cost Oper Paid
210000.0
Est Cost Prop Damage
8000.0
Est Cost Emergency
6500.0
Est Cost Other
0.0
Gas Cost In Mcf
6.22
Est Cost Unintentional Release
288.0
Est Cost Intentional Release
0.0
Prpty
224788.0
Commercial Affected
0.0
Industrial Affected
0.0
Residences Affected
5.0
Num Persons Hosp Not Ovnght
0.0
Num Injured Treated By Emt
0.0
Num Resident Building Affctd
5.0
Num Business Building Affctd
0.0
Accident Psig
30.0
Normal Psig
30.0
Mop Psig
34.0
Mop Cfr Section
192.619(A)(1)
Maop Established Date
1993-09-17 00:00:00
Accident Pressure
Pressure Did Not Exceed Maop
Gas Odorized System Type
Odorized By Others
Gas Odorized Level
12.5
Scada In Place Ind
No
Accident Identifier
Notification From Third Party That Caused The Incident
Investigation Status
No, the facility was not monitored by a controller(s) at the time of the incident
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
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
State Law Exempt Ind
No
Notify Cga Dirt
No
Public Row Ind
Yes
Public Subtype
City Street
Excavator Type
Contractor
Excavator Equipment
Backhoe/trackhoe
Work Performed
Water
One Call Notified Ind
Yes
One Call Ticket Num
2129918149
Locator Type
Contract Locator
Visible Marks
No
Service Interruption
Yes
Service Interruption Hours
3.0
Root Cause Category
Notification Issue
Root Cause Type
No Notification Made To The One-Call Center/811
Preparer Name
G*** W******
Preparer Title
Manager Policy And Procedure
Preparer Email
G***********@m**.com
Preparer Telephone
2083776032
Local Contact Name
G*** W******
Local Contact Email
G***********@m**.com
Local Contact Telephone
2083776032
Authorizer Name
G*** W******
Authorizer Title
Manager Policy And Procedure
Authorizer Telephone
2083776032
Authorizer Email
G***********@m**.com
Narrative
On november 29, 2021 at 9:22 a.M. Mst, an excavator notified montana-dakota utilities co. (mdu) that they damaged a 1" main near 920 11th street, rapid city, south dakota. An mdu first responder arrived at 10:27 a.M. Mst and after checking in with local fire department personnel on scene, began investigating. While the mdu emergency responders were working to secure the damage, the leaking natural gas caused by the excavation damage migrated and subsequently ignited causing an explosion and a fire at 920 11th street. An mdu crew excavated and squeezed the 2" steel main upstream of the damaged 1" main. The investigation determined the third-party excavator locate ticket expired prior to commencing work on the date of the incident.
| Occurred At | 2021-11-29 10:27:00 |
|---|---|
| Year | 2021 |
| Report Received Date | 2021-12-22 00:00:00 |
| Iyear | 2021.0 |
| Report Number | 20210104.0 |
| Supplemental Number | 36172.0 |
| Report Type | Original Final |
| Operator Id | 12684 PHMSA Enforcement |
| Name | Montana - Dakota Utilities Co |
| Operator Street Address | 400 North Fourth Street |
| Operator City Name | Bismarck |
| Operator State Abbreviation | ND |
| Operator Postal Code | 58501 |
| Local Datetime | 2021-11-29 11:00:00 |
| Time Zone | Mountain |
| Daylight Savings Ind | No |
| Location Street Address | 920 11th Street |
| Location City Name | Rapid City |
| Location County Name | Pennington |
| Location State Abbreviation | SD |
| Location Postal Code | 57701 |
| Location Latitude | 44.07769794 Google Maps OpenStreetMap |
| Location Longitude | -103.237473 Google Maps OpenStreetMap |
| Flow Cont Squeeze Off Ind | Yes |
| Nrc Rpt Datetime | 2021-11-29 11:28:00 |
| Nrc Rpt Num | 1323119 NRC Report How to search |
| Additional Nrc Report Numbers | 1323315 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 46.28 |
| Intentional Release | 0.0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | Yes |
| Ignite Datetime | 2021-11-29 11:00:00 |
| How Extinguished | Allowed To Burn Out |
| Gas Consumed By Fire In Mcf | 10.85 |
| Explode Ind | Yes |
| Num Pub Evacuated | 4.0 |
| Incident Identified Datetime | 2021-11-29 10:27:00 |
| Communication State Fed Ind | Yes |
| Party Initiated Communication | Operator |
| Initial Responder Com Datetime | 2021-11-29 10:27:00 |
| On Site Datetime | 2021-11-29 10:27:00 |
| Federal | No |
| Location Type | Private Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Other |
| Incident Area Details | Inside Residential Structure. |
| Depth Of Cover | 30.0 |
| Other Underground Facilities | No |
| Crossing | No |
| Pipe Facility Type | Investor Owned |
| System Part Involved | Main |
| Installation Year | 1967.0 |
| Pipe Diameter | 1.0 |
| Pipe Specification | Unknown |
| Pipe Manufacturer | Unknown |
| Material Involved | Steel |
| Steel Seam Type | Longitudinal Erw - Unknown Frequency |
| Release Type | Other |
| Release Type Details | Third Party Damage Pulled Distribution Main Apart At An Elbow Fitting Connection. |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 210000.0 |
| Est Cost Prop Damage | 8000.0 |
| Est Cost Emergency | 6500.0 |
| Est Cost Other | 0.0 |
| Gas Cost In Mcf | 6.22 |
| Est Cost Unintentional Release | 288.0 |
| Est Cost Intentional Release | 0.0 |
| Prpty | 224788.0 |
| Commercial Affected | 0.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 5.0 |
| Num Persons Hosp Not Ovnght | 0.0 |
| Num Injured Treated By Emt | 0.0 |
| Num Resident Building Affctd | 5.0 |
| Num Business Building Affctd | 0.0 |
| Accident Psig | 30.0 |
| Normal Psig | 30.0 |
| Mop Psig | 34.0 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Maop Established Date | 1993-09-17 00:00:00 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Gas Odorized System Type | Odorized By Others |
| Gas Odorized Level | 12.5 |
| Scada In Place Ind | No |
| Accident Identifier | Notification From Third Party That Caused The Incident |
| Investigation Status | No, the facility was not monitored by a controller(s) at the time of the incident |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| 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 |
| State Law Exempt Ind | No |
| Notify Cga Dirt | No |
| Public Row Ind | Yes |
| Public Subtype | City Street |
| Excavator Type | Contractor |
| Excavator Equipment | Backhoe/trackhoe |
| Work Performed | Water |
| One Call Notified Ind | Yes |
| One Call Ticket Num | 2129918149 |
| Locator Type | Contract Locator |
| Visible Marks | No |
| Service Interruption | Yes |
| Service Interruption Hours | 3.0 |
| Root Cause Category | Notification Issue |
| Root Cause Type | No Notification Made To The One-Call Center/811 |
| Preparer Name | G*** W****** |
| Preparer Title | Manager Policy And Procedure |
| Preparer Email | G***********@m**.com |
| Preparer Telephone | 2083776032 |
| Local Contact Name | G*** W****** |
| Local Contact Email | G***********@m**.com |
| Local Contact Telephone | 2083776032 |
| Authorizer Name | G*** W****** |
| Authorizer Title | Manager Policy And Procedure |
| Authorizer Telephone | 2083776032 |
| Authorizer Email | G***********@m**.com |
| Narrative | On november 29, 2021 at 9:22 a.M. Mst, an excavator notified montana-dakota utilities co. (mdu) that they damaged a 1" main near 920 11th street, rapid city, south dakota. An mdu first responder arrived at 10:27 a.M. Mst and after checking in with local fire department personnel on scene, began investigating. While the mdu emergency responders were working to secure the damage, the leaking natural gas caused by the excavation damage migrated and subsequently ignited causing an explosion and a fire at 920 11th street. An mdu crew excavated and squeezed the 2" steel main upstream of the damaged 1" main. The investigation determined the third-party excavator locate ticket expired prior to commencing work on the date of the incident. |
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