Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2018-02-06 — SD
Operator
Northwestern Corporation
Cause
Other Outside Force Damage
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$150
Incident datetime
2018-02-06 10:14
Report number
Location
SD, BROWN
Narrative
Events on feb 6 2018 northwestern originally reported to the nrc with the notification time of 8:58. This was an error in reporting. The time northwestern received the first notification from 911 was 10:14 cst. This time was retrieved from our incoming call long and verified to be accurate. The incorrect time of 8:58 incorrectly reported represented the date/time stamp in customer information system and is in mst time zone. The incident location is in cst time zone. In addition the date/time stamp was incorrectly attached to two consecutive orders by the customer service representative. 10:14 cst northwestern received a call from 911 requesting assistance at 207 n 2nd in aberdeen sd. House was a vacant premise with no one occupying the structure. 10:23 cst northwestern arrived on site. 10:28 cst power shut off to premise at the pole. 10:50 cst adjacent structures checked with fire department 10:55 cst fire department requested service line to be shut off 11:20 cst service was squeezed off approximately 40 ft. From home due to fire. 11:28 to 12:00 cst sd puc notified. Odormeter, leak survey and additional bar holing completed. No evidence of additional gas issues found. 12:00 to 17:00 cst area monitored and technicians on site to assist fire department as needed. 13:25 cst nrc notified. Due to heavy ground frost a thaw blanket was applied to be use to thaw the ground to complete the full retirement of the service on feb 12 2018. Feb 7 2018 premise historically a rental home with no occupants at this time. Last known occupants interviewed by fire marshall and northwestern representative. Occupants indicated no noticeable gas smell inside the home. Occupants' washer and dryer located in the basement on the wall directly associated with natural gas meter. Occupants described an issue with the basement wall cracking due to wall movement and creating a draft in the home. Landlord supplied caulking to occupants to fill in cracks created by basement wall movement. Meter retrieved and obtained by northwestern. Per fire marshall request pressure test attempted from squeeze point to meter and failed. Site released by fire marshall to home owner insurance. Feb 9 2018 attempted to retire service from squeeze off point the main in alley as thaw blanket had been on since feb 6 2018. Insufficient thaw. Thaw blanket put back on main/service area. Feb 12 2018 sufficient thaw. Service retired at the main. Feb 21 2018 coordinated investigation with all concerned parties including the sd puc to dig up service pipe from squeeze off point to meter. Thaw blankets put on service the week prior. Excavated partial area. Due to unforeseen concrete patio insufficient thaw around meter area. Reapplied the thaw blanket. Feb 23 2018 coordinated investigation with all concerned parties including the sd puc to resume excavation. Service and riser area fully excavated. Fracture found at the riser connection to a 90 degree elbow. Damaged riser and elbow removed from the ground. Pressure test from pipe removal elbow to squeeze off point successful. No further damage. Due to the fractured surface of the elbow and pipe, northwestern and outside investigation retained by northwestern believe the evidence supports the fracture to be cause by an outside force, likely the basement wall movement, created the force on the pipe to cause the fracture.
Detailed record list
Occurred At
2018-02-06 10:14:00
Year
2018
Report Received Date
2018-03-07 00:00:00
Iyear
2018.0
Report Number
20180031.0
Supplemental Number
30061.0
Report Type
Supplemental Final
Operator Id
31632
Name
Northwestern Corporation
Operator Street Address
3010 W. 69th St.
Operator City Name
Sioux Falls
Operator State Abbreviation
SD
Operator Postal Code
57108
Local Datetime
2018-02-06 10:14:00
Location Street Address
507 N 2nd St
Location City Name
Aberdeen
Location County Name
Brown
Location State Abbreviation
SD
Location Postal Code
57401
Location Latitude
45.470957
Location Longitude
-98.490929
Nrc Rpt Datetime
2018-02-06 13:25:00
Nrc Rpt Num
1203737
Commodity Released Type
Natural Gas
Unintentional Release
5.0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
Yes
Explode Ind
Yes
Num Pub Evacuated
2.0
Incident Identified Datetime
2018-02-06 10:14:00
On Site Datetime
2018-02-06 10:23:00
Federal
No
Location Type
Private Property
Incident Area Type
Underground
Incident Area Subtype
Under Pavement
Depth Of Cover
24.0
Crossing
No
Pipe Facility Type
Investor Owned
System Part Involved
Service Riser
Installation Year
1956.0
Material Involved
Steel
Wt Steel
0.156
Release Type
Leak
Leak Type
Connection Failure
Class Location Type
Class 3 Location
Est Cost Oper Paid
85000.0
Est Cost Prop Damage
150.0
Est Cost Emergency
500.0
Est Cost Other
25000.0
Est Cost Other Details
Fire Investigation/rental Of Ground Thaw Blanket To Remove Frost
Est Cost Unintentional Release
50.0
Prpty
110700.0
Commercial Affected
0.0
Industrial Affected
0.0
Residences Affected
2.0
Accident Psig
23.0
Normal Psig
23.0
Mop Psig
25.0
Accident Pressure
Pressure Did Not Exceed Maop
Scada In Place Ind
No
Accident Identifier
Notification From Emergency Responder
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
Other Outside Force Damage
Cause Details
Other Outside Force Damage
Outside Force Type
Other Outside Force Damage
Osf Other Details
Structural Movement Of Building Wall
Preparer Name
M****** B*****
Preparer Title
Dot Supervisor
Preparer Email
M*************@n***********.com
Preparer Telephone
6053537462
Authorizer Name
M****** B*****
Authorizer Title
Dot Superviosr
Authorizer Telephone
6053537462
Authorizer Email
M*************@n***********.com
Narrative
Events on feb 6 2018 northwestern originally reported to the nrc with the notification time of 8:58. This was an error in reporting. The time northwestern received the first notification from 911 was 10:14 cst. This time was retrieved from our incoming call long and verified to be accurate. The incorrect time of 8:58 incorrectly reported represented the date/time stamp in customer information system and is in mst time zone. The incident location is in cst time zone. In addition the date/time stamp was incorrectly attached to two consecutive orders by the customer service representative. 10:14 cst northwestern received a call from 911 requesting assistance at 207 n 2nd in aberdeen sd. House was a vacant premise with no one occupying the structure. 10:23 cst northwestern arrived on site. 10:28 cst power shut off to premise at the pole. 10:50 cst adjacent structures checked with fire department 10:55 cst fire department requested service line to be shut off 11:20 cst service was squeezed off approximately 40 ft. From home due to fire. 11:28 to 12:00 cst sd puc notified. Odormeter, leak survey and additional bar holing completed. No evidence of additional gas issues found. 12:00 to 17:00 cst area monitored and technicians on site to assist fire department as needed. 13:25 cst nrc notified. Due to heavy ground frost a thaw blanket was applied to be use to thaw the ground to complete the full retirement of the service on feb 12 2018. Feb 7 2018 premise historically a rental home with no occupants at this time. Last known occupants interviewed by fire marshall and northwestern representative. Occupants indicated no noticeable gas smell inside the home. Occupants' washer and dryer located in the basement on the wall directly associated with natural gas meter. Occupants described an issue with the basement wall cracking due to wall movement and creating a draft in the home. Landlord supplied caulking to occupants to fill in cracks created by basement wall movement. Meter retrieved and obtained by northwestern. Per fire marshall request pressure test attempted from squeeze point to meter and failed. Site released by fire marshall to home owner insurance. Feb 9 2018 attempted to retire service from squeeze off point the main in alley as thaw blanket had been on since feb 6 2018. Insufficient thaw. Thaw blanket put back on main/service area. Feb 12 2018 sufficient thaw. Service retired at the main. Feb 21 2018 coordinated investigation with all concerned parties including the sd puc to dig up service pipe from squeeze off point to meter. Thaw blankets put on service the week prior. Excavated partial area. Due to unforeseen concrete patio insufficient thaw around meter area. Reapplied the thaw blanket. Feb 23 2018 coordinated investigation with all concerned parties including the sd puc to resume excavation. Service and riser area fully excavated. Fracture found at the riser connection to a 90 degree elbow. Damaged riser and elbow removed from the ground. Pressure test from pipe removal elbow to squeeze off point successful. No further damage. Due to the fractured surface of the elbow and pipe, northwestern and outside investigation retained by northwestern believe the evidence supports the fracture to be cause by an outside force, likely the basement wall movement, created the force on the pipe to cause the fracture.
| Occurred At | 2018-02-06 10:14:00 |
|---|---|
| Year | 2018 |
| Report Received Date | 2018-03-07 00:00:00 |
| Iyear | 2018.0 |
| Report Number | 20180031.0 |
| Supplemental Number | 30061.0 |
| Report Type | Supplemental Final |
| Operator Id | 31632 PHMSA Enforcement |
| Name | Northwestern Corporation |
| Operator Street Address | 3010 W. 69th St. |
| Operator City Name | Sioux Falls |
| Operator State Abbreviation | SD |
| Operator Postal Code | 57108 |
| Local Datetime | 2018-02-06 10:14:00 |
| Location Street Address | 507 N 2nd St |
| Location City Name | Aberdeen |
| Location County Name | Brown |
| Location State Abbreviation | SD |
| Location Postal Code | 57401 |
| Location Latitude | 45.470957 Google Maps OpenStreetMap |
| Location Longitude | -98.490929 Google Maps OpenStreetMap |
| Nrc Rpt Datetime | 2018-02-06 13:25:00 |
| Nrc Rpt Num | 1203737 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 5.0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | Yes |
| Explode Ind | Yes |
| Num Pub Evacuated | 2.0 |
| Incident Identified Datetime | 2018-02-06 10:14:00 |
| On Site Datetime | 2018-02-06 10:23:00 |
| Federal | No |
| Location Type | Private Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Pavement |
| Depth Of Cover | 24.0 |
| Crossing | No |
| Pipe Facility Type | Investor Owned |
| System Part Involved | Service Riser |
| Installation Year | 1956.0 |
| Material Involved | Steel |
| Wt Steel | 0.156 |
| Release Type | Leak |
| Leak Type | Connection Failure |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 85000.0 |
| Est Cost Prop Damage | 150.0 |
| Est Cost Emergency | 500.0 |
| Est Cost Other | 25000.0 |
| Est Cost Other Details | Fire Investigation/rental Of Ground Thaw Blanket To Remove Frost |
| Est Cost Unintentional Release | 50.0 |
| Prpty | 110700.0 |
| Commercial Affected | 0.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 2.0 |
| Accident Psig | 23.0 |
| Normal Psig | 23.0 |
| Mop Psig | 25.0 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Scada In Place Ind | No |
| Accident Identifier | Notification From Emergency Responder |
| 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 | Other Outside Force Damage |
| Cause Details | Other Outside Force Damage |
| Outside Force Type | Other Outside Force Damage |
| Osf Other Details | Structural Movement Of Building Wall |
| Preparer Name | M****** B***** |
| Preparer Title | Dot Supervisor |
| Preparer Email | M*************@n***********.com |
| Preparer Telephone | 6053537462 |
| Authorizer Name | M****** B***** |
| Authorizer Title | Dot Superviosr |
| Authorizer Telephone | 6053537462 |
| Authorizer Email | M*************@n***********.com |
| Narrative | Events on feb 6 2018 northwestern originally reported to the nrc with the notification time of 8:58. This was an error in reporting. The time northwestern received the first notification from 911 was 10:14 cst. This time was retrieved from our incoming call long and verified to be accurate. The incorrect time of 8:58 incorrectly reported represented the date/time stamp in customer information system and is in mst time zone. The incident location is in cst time zone. In addition the date/time stamp was incorrectly attached to two consecutive orders by the customer service representative. 10:14 cst northwestern received a call from 911 requesting assistance at 207 n 2nd in aberdeen sd. House was a vacant premise with no one occupying the structure. 10:23 cst northwestern arrived on site. 10:28 cst power shut off to premise at the pole. 10:50 cst adjacent structures checked with fire department 10:55 cst fire department requested service line to be shut off 11:20 cst service was squeezed off approximately 40 ft. From home due to fire. 11:28 to 12:00 cst sd puc notified. Odormeter, leak survey and additional bar holing completed. No evidence of additional gas issues found. 12:00 to 17:00 cst area monitored and technicians on site to assist fire department as needed. 13:25 cst nrc notified. Due to heavy ground frost a thaw blanket was applied to be use to thaw the ground to complete the full retirement of the service on feb 12 2018. Feb 7 2018 premise historically a rental home with no occupants at this time. Last known occupants interviewed by fire marshall and northwestern representative. Occupants indicated no noticeable gas smell inside the home. Occupants' washer and dryer located in the basement on the wall directly associated with natural gas meter. Occupants described an issue with the basement wall cracking due to wall movement and creating a draft in the home. Landlord supplied caulking to occupants to fill in cracks created by basement wall movement. Meter retrieved and obtained by northwestern. Per fire marshall request pressure test attempted from squeeze point to meter and failed. Site released by fire marshall to home owner insurance. Feb 9 2018 attempted to retire service from squeeze off point the main in alley as thaw blanket had been on since feb 6 2018. Insufficient thaw. Thaw blanket put back on main/service area. Feb 12 2018 sufficient thaw. Service retired at the main. Feb 21 2018 coordinated investigation with all concerned parties including the sd puc to dig up service pipe from squeeze off point to meter. Thaw blankets put on service the week prior. Excavated partial area. Due to unforeseen concrete patio insufficient thaw around meter area. Reapplied the thaw blanket. Feb 23 2018 coordinated investigation with all concerned parties including the sd puc to resume excavation. Service and riser area fully excavated. Fracture found at the riser connection to a 90 degree elbow. Damaged riser and elbow removed from the ground. Pressure test from pipe removal elbow to squeeze off point successful. No further damage. Due to the fractured surface of the elbow and pipe, northwestern and outside investigation retained by northwestern believe the evidence supports the fracture to be cause by an outside force, likely the basement wall movement, created the force on the pipe to cause the fracture. |
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