Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2023-12-04 — MA
Operator
Nstar Gas Company
Cause
Excavation Issue
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$2,771
Incident datetime
2023-12-04 00:00 UTC
Report number
Location
MA, NORFOLK
Narrative
During a planned service line replacement, a second party contractor struck a service line causing an ignition and house fire. The residents were not home at that time. A contractor employee sustained a minor injury. The service line was cut off at the main when the situation was deemed safe. The building was demolished the day of the incident. G3.7: mini excavator was being utilized. G3.12: on november 4, the original marks in the public way showing the service line from the service tee to the property line at the left side of the property were visible and accurate. There were no visible markings or flags on the private property. Private property markings were either not applied or not maintained. G3.14 the crew was mechanically excavating the trench for the new service on the private property when they struck the active 1" steel service.
Detailed record list
Report Received Date
2023-12-04 00:00:00
Iyear
2023.0
Report Number
20230072.0
Supplemental Number
40634.0
Report Type
Supplemental Final
Operator Id
2652
Name
Nstar Gas Company
Operator Street Address
157 Cordaville Road
Operator City Name
Southborough
Operator State Abbreviation
MA
Operator Postal Code
1772.0
Time Zone
Eastern
Daylight Savings Ind
Yes
Location Street Address
126 Prince St
Location City Name
Needham
Location County Name
Norfolk
Location State Abbreviation
MA
Location Postal Code
2492.0
Location Latitude
42.27603
Location Longitude
-71.22185
Flow Cont Service Valve Ind
Yes
Nrc Rpt Num
1383441.0
Additional Nrc Report Numbers
1383554.0
Commodity Released Type
Natural Gas
Unintentional Release
72.0
Intentional Release
0.0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
Yes
How Extinguished
Local/state/federal Emergency Responder
Gas Consumed By Fire In Mcf
72
Explode Ind
Yes
Num Pub Evacuated
0.0
Communication State Fed Ind
Yes
Party Initiated Communication
Operator
Federal
No
Location Type
Private Property
Incident Area Type
Underground
Incident Area Subtype
Exposed Due To Excavation
Depth Of Cover
19.0
Other Underground Facilities
No
Crossing
No
Pipe Facility Type
Investor Owned
System Part Involved
Service
Installation Year
1963.0
Customer Type
Single Family Residential
Was Efv Installed Before Ind
No
Curb Valve Inst Before Inc Ind
Yes
Pipe Diameter
1.0
Pipe Specification
Unknown
Pipe Manufacturer
Unknown
Material Involved
Steel
Steel Seam Type
Seamless
Wt Steel
0.133
Release Type
Other
Release Type Details
Excavation Damage From Contact With Small Excavator
Class Location Type
Class 3 Location
Est Cost Oper Paid
350900.0
Est Cost Prop Damage
2771.0
Est Cost Emergency
37907.0
Est Cost Other
0.0
Est Cost Other Details
2a: Based On Assessed Dwelling Value. Responsibility For Reimbursement Tbd.
Gas Cost In Mcf
7.68
Est Cost Unintentional Release
553.0
Est Cost Intentional Release
0.0
Prpty
392131.0
Commercial Affected
0.0
Industrial Affected
0.0
Residences Affected
1.0
Num Persons Hosp Not Ovnght
1.0
Num Injured Treated By Emt
0.0
Num Resident Building Affctd
1.0
Num Business Building Affctd
0.0
Accident Psig
55.9
Normal Psig
55.9
Mop Psig
60.0
Mop Cfr Section
192.619(A)(2)
Maop Established Date
1963-06-10 00:00:00
Accident Pressure
Pressure Did Not Exceed Maop
Gas Odorized System Type
Injection Pump
Gas Odorized Lvl Not Msrd Ind
Yes
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
No
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Contractor Working For The Operator
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
This was an excavator damage by 2nd party contractor.
Employee Drug Test Ind
No
Contractor Drug Test Ind
Yes
Num Contractors Tested
3
Num Contractors Failed
0
Cause
Excavation Damage
Cause Details
Excavation Damage By Operator's Contractor (Second Party)
Ex Party Type
Excavation Damage By Operator's Contractor (Second Party)
Prior Notification Ind
Yes
One Call System Ind
Yes
Excavator Ind
Yes
Contractor Ind
Yes
State Law Exempt Ind
No
Notify Cga Dirt
No
Private Row Ind
Yes
Private Subtype
Private Landowner
Joint Trench Ind
No
Cross Bore Ind
No
Depth Of Grade
18� � 36�
Excavator Type
Contractor
Excavator Equipment
Unknown/other
Work Performed
Natural Gas
One Call Notified Ind
Yes
One Call Ticket Num
2023431452.0
White Lined Ind
Unknown
Locator Type
Contract Locator
Visible Marks
No
Service Interruption
Unknown/other
Root Cause Category
Excavation Issue
Root Cause Type
Improper Backfilling Practices
Excvtn Dmg Op Contractor Ind
Yes
Preparer Name
K******** S*****
Preparer Title
Manager Compliance
Preparer Email
K***************@e*********.com
Preparer Telephone
5088641836
Local Contact Name
K******** S*****
Local Contact Email
K***************@e*********.com
Local Contact Telephone
5088641836
Authorizer Name
K******** S*****
Authorizer Title
Manager Compliance
Authorizer Telephone
5088641836
Authorizer Email
K***************@e*********.com
Narrative
During a planned service line replacement, a second party contractor struck a service line causing an ignition and house fire. The residents were not home at that time. A contractor employee sustained a minor injury. The service line was cut off at the main when the situation was deemed safe. The building was demolished the day of the incident. G3.7: mini excavator was being utilized. G3.12: on november 4, the original marks in the public way showing the service line from the service tee to the property line at the left side of the property were visible and accurate. There were no visible markings or flags on the private property. Private property markings were either not applied or not maintained. G3.14 the crew was mechanically excavating the trench for the new service on the private property when they struck the active 1" steel service.
| Report Received Date | 2023-12-04 00:00:00 |
|---|---|
| Iyear | 2023.0 |
| Report Number | 20230072.0 |
| Supplemental Number | 40634.0 |
| Report Type | Supplemental Final |
| Operator Id | 2652 PHMSA Enforcement |
| Name | Nstar Gas Company |
| Operator Street Address | 157 Cordaville Road |
| Operator City Name | Southborough |
| Operator State Abbreviation | MA |
| Operator Postal Code | 1772.0 |
| Time Zone | Eastern |
| Daylight Savings Ind | Yes |
| Location Street Address | 126 Prince St |
| Location City Name | Needham |
| Location County Name | Norfolk |
| Location State Abbreviation | MA |
| Location Postal Code | 2492.0 |
| Location Latitude | 42.27603 Google Maps OpenStreetMap |
| Location Longitude | -71.22185 Google Maps OpenStreetMap |
| Flow Cont Service Valve Ind | Yes |
| Nrc Rpt Num | 1383441.0 NRC Report How to search |
| Additional Nrc Report Numbers | 1383554.0 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 72.0 |
| Intentional Release | 0.0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | Yes |
| How Extinguished | Local/state/federal Emergency Responder |
| Gas Consumed By Fire In Mcf | 72 |
| Explode Ind | Yes |
| Num Pub Evacuated | 0.0 |
| Communication State Fed Ind | Yes |
| Party Initiated Communication | Operator |
| Federal | No |
| Location Type | Private Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Exposed Due To Excavation |
| Depth Of Cover | 19.0 |
| Other Underground Facilities | No |
| Crossing | No |
| Pipe Facility Type | Investor Owned |
| System Part Involved | Service |
| Installation Year | 1963.0 |
| Customer Type | Single Family Residential |
| Was Efv Installed Before Ind | No |
| Curb Valve Inst Before Inc Ind | Yes |
| Pipe Diameter | 1.0 |
| Pipe Specification | Unknown |
| Pipe Manufacturer | Unknown |
| Material Involved | Steel |
| Steel Seam Type | Seamless |
| Wt Steel | 0.133 |
| Release Type | Other |
| Release Type Details | Excavation Damage From Contact With Small Excavator |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 350900.0 |
| Est Cost Prop Damage | 2771.0 |
| Est Cost Emergency | 37907.0 |
| Est Cost Other | 0.0 |
| Est Cost Other Details | 2a: Based On Assessed Dwelling Value. Responsibility For Reimbursement Tbd. |
| Gas Cost In Mcf | 7.68 |
| Est Cost Unintentional Release | 553.0 |
| Est Cost Intentional Release | 0.0 |
| Prpty | 392131.0 |
| Commercial Affected | 0.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 1.0 |
| Num Persons Hosp Not Ovnght | 1.0 |
| Num Injured Treated By Emt | 0.0 |
| Num Resident Building Affctd | 1.0 |
| Num Business Building Affctd | 0.0 |
| Accident Psig | 55.9 |
| Normal Psig | 55.9 |
| Mop Psig | 60.0 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 1963-06-10 00:00:00 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Gas Odorized System Type | Injection Pump |
| Gas Odorized Lvl Not Msrd Ind | Yes |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | No |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Contractor Working For The Operator |
| 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 | This was an excavator damage by 2nd party contractor. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | Yes |
| Num Contractors Tested | 3 |
| Num Contractors Failed | 0 |
| Cause | Excavation Damage |
| Cause Details | Excavation Damage By Operator's Contractor (Second Party) |
| Ex Party Type | Excavation Damage By Operator's Contractor (Second Party) |
| Prior Notification Ind | Yes |
| One Call System Ind | Yes |
| Excavator Ind | Yes |
| Contractor Ind | Yes |
| State Law Exempt Ind | No |
| Notify Cga Dirt | No |
| Private Row Ind | Yes |
| Private Subtype | Private Landowner |
| Joint Trench Ind | No |
| Cross Bore Ind | No |
| Depth Of Grade | 18� � 36� |
| Excavator Type | Contractor |
| Excavator Equipment | Unknown/other |
| Work Performed | Natural Gas |
| One Call Notified Ind | Yes |
| One Call Ticket Num | 2023431452.0 |
| White Lined Ind | Unknown |
| Locator Type | Contract Locator |
| Visible Marks | No |
| Service Interruption | Unknown/other |
| Root Cause Category | Excavation Issue |
| Root Cause Type | Improper Backfilling Practices |
| Excvtn Dmg Op Contractor Ind | Yes |
| Preparer Name | K******** S***** |
| Preparer Title | Manager Compliance |
| Preparer Email | K***************@e*********.com |
| Preparer Telephone | 5088641836 |
| Local Contact Name | K******** S***** |
| Local Contact Email | K***************@e*********.com |
| Local Contact Telephone | 5088641836 |
| Authorizer Name | K******** S***** |
| Authorizer Title | Manager Compliance |
| Authorizer Telephone | 5088641836 |
| Authorizer Email | K***************@e*********.com |
| Narrative | During a planned service line replacement, a second party contractor struck a service line causing an ignition and house fire. The residents were not home at that time. A contractor employee sustained a minor injury. The service line was cut off at the main when the situation was deemed safe. The building was demolished the day of the incident. G3.7: mini excavator was being utilized. G3.12: on november 4, the original marks in the public way showing the service line from the service tee to the property line at the left side of the property were visible and accurate. There were no visible markings or flags on the private property. Private property markings were either not applied or not maintained. G3.14 the crew was mechanically excavating the trench for the new service on the private property when they struck the active 1" steel service. |
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