Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2016-08-11 — MD
Operator
Washington Gas Light Co
Cause
Other Incident Cause
Commodity
Natural Gas
Program
GD
Damage and Injuries
7 fatalities
33 injuries
Property damage (nominal)
$0
Incident datetime
2016-08-11 00:36
Report number
Location
MD, MONTGOMERY COUNTY
Narrative
On august 10, 2016 an explosion and fire occurred at 8701 arliss street in silver spring, maryland. The national transportation safety board (ntsb) concluded that the probable cause of the explosion in building 8701 was the failure of an indoor mercury service regulator. Washington gas believes the evidence, including multiple sources of natural gas onsite that could have contributed to the incident, does not permit a conclusive determination of probable cause. Thus, for the purposes of this report, washington gas avers that the actual cause remains undetermined. Nonetheless, washington gas has implemented all safety recommendations promulgated by the ntsb with respect to the incident, including expedited removal of mercury service regulators remaining on the company's system. The maryland public service commission approved washington gas' expedited removal program on december 18, 2020. Operator note: reference part a, question 21.D, "no" is selected because option of "unknown" is not provided.
Detailed record list
Occurred At
2016-08-11 00:36:00
Year
2016
Report Received Date
2016-09-09 00:00:00
Iyear
2016.0
Report Number
20160086.0
Supplemental Number
38837.0
Report Type
Supplemental Final
Operator Id
22182
Name
Washington Gas Light Co
Operator Street Address
1000 Maine Avenue, Sw
Operator City Name
Washington
Operator State Abbreviation
DC
Operator Postal Code
20024
Local Datetime
2016-08-11 00:10:00
Time Zone
Eastern
Daylight Savings Ind
No
Location Street Address
8701 Arliss St
Location City Name
Silver Spring
Location County Name
Montgomery County
Location State Abbreviation
MD
Location Postal Code
20901-3981
Location Latitude
38.998431
Location Longitude
-77.001087
Flow Cont Service Valve Ind
Yes
Nrc Rpt Datetime
2016-08-11 01:31:00
Nrc Rpt Num
1155909
Commodity Released Type
Natural Gas
Unintentional Release
38.0
Intentional Release
0.0
Fatality Ind
Yes
Num Emp Fatalities
0
Num Contr Fatalities
0
Num Er Fatalities
0
Num Worker Fatalities
0
Num Gp Fatalities
7
Fatal
7
Injury Ind
Yes
Num Emp Injuries
0
Num Contr Injuries
0
Num Er Injuries
1
Num Worker Injuries
0
Num Gp Injuries
32
Injure
33
Ignite Ind
Yes
Ignite Datetime
2016-08-11 00:05:00
How Extinguished
Local/state/federal Emergency Responder
Gas Consumed By Fire In Mcf
38
Explode Ind
No
Num Pub Evacuated
200.0
Incident Identified Datetime
2016-08-11 00:36:00
On Site Datetime
2016-08-11 00:36:00
Federal
No
Location Type
Private Property
Incident Area Type
Aboveground
Incident Area Subtype
Inside A Building
Crossing
No
Pipe Facility Type
Investor Owned
System Part Involved
Other
System Part Details
Undetermined
Material Involved
Other
Material Details
Undetermined
Release Type
Other
Release Type Details
Undetermined
Class Location Type
Class 4 Location
Est Cost Oper Paid
1650000.0
Est Cost Prop Damage
0.0
Est Cost Emergency
52336.0
Est Cost Other
0.0
Gas Cost In Mcf
3.83
Est Cost Unintentional Release
146.0
Est Cost Intentional Release
0.0
Prpty
1702482.0
Commercial Affected
0.0
Industrial Affected
0.0
Residences Affected
30.0
Num Persons Hosp Not Ovnght
0.0
Num Injured Treated By Emt
0.0
Num Resident Building Affctd
3.0
Num Business Building Affctd
0.0
Accident Psig
20.0
Normal Psig
20.0
Mop Psig
25.0
Mop Cfr Section
192.619(A)(4)
Maop Established Date
1955-01-01 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
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 Incident Cause
Cause Details
Unknown
Other Type
Unknown
Unknown Subtype
Investigation Complete, Cause Of Incident Unknown
Incident Unknown Comments
Cause Of Incident Is Undetermined.
Preparer Name
S****** B* M******
Preparer Title
Manager Pipeline Safety Compliance And Quality
Preparer Email
S*******@w******.com
Preparer Telephone
7037505558
Local Contact Name
R****** F**********
Local Contact Email
R*****************@w******.com
Local Contact Telephone
7036397825
Authorizer Name
S****** P****
Authorizer Title
Avp Safety Quality System Protection
Authorizer Telephone
703-750-4586
Authorizer Email
S*****@w******.com
Narrative
On august 10, 2016 an explosion and fire occurred at 8701 arliss street in silver spring, maryland. The national transportation safety board (ntsb) concluded that the probable cause of the explosion in building 8701 was the failure of an indoor mercury service regulator. Washington gas believes the evidence, including multiple sources of natural gas onsite that could have contributed to the incident, does not permit a conclusive determination of probable cause. Thus, for the purposes of this report, washington gas avers that the actual cause remains undetermined. Nonetheless, washington gas has implemented all safety recommendations promulgated by the ntsb with respect to the incident, including expedited removal of mercury service regulators remaining on the company's system. The maryland public service commission approved washington gas' expedited removal program on december 18, 2020. Operator note: reference part a, question 21.D, "no" is selected because option of "unknown" is not provided.
| Occurred At | 2016-08-11 00:36:00 |
|---|---|
| Year | 2016 |
| Report Received Date | 2016-09-09 00:00:00 |
| Iyear | 2016.0 |
| Report Number | 20160086.0 |
| Supplemental Number | 38837.0 |
| Report Type | Supplemental Final |
| Operator Id | 22182 PHMSA Enforcement |
| Name | Washington Gas Light Co |
| Operator Street Address | 1000 Maine Avenue, Sw |
| Operator City Name | Washington |
| Operator State Abbreviation | DC |
| Operator Postal Code | 20024 |
| Local Datetime | 2016-08-11 00:10:00 |
| Time Zone | Eastern |
| Daylight Savings Ind | No |
| Location Street Address | 8701 Arliss St |
| Location City Name | Silver Spring |
| Location County Name | Montgomery County |
| Location State Abbreviation | MD |
| Location Postal Code | 20901-3981 |
| Location Latitude | 38.998431 Google Maps OpenStreetMap |
| Location Longitude | -77.001087 Google Maps OpenStreetMap |
| Flow Cont Service Valve Ind | Yes |
| Nrc Rpt Datetime | 2016-08-11 01:31:00 |
| Nrc Rpt Num | 1155909 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 38.0 |
| Intentional Release | 0.0 |
| Fatality Ind | Yes |
| Num Emp Fatalities | 0 |
| Num Contr Fatalities | 0 |
| Num Er Fatalities | 0 |
| Num Worker Fatalities | 0 |
| Num Gp Fatalities | 7 |
| Fatal | 7 |
| Injury Ind | Yes |
| Num Emp Injuries | 0 |
| Num Contr Injuries | 0 |
| Num Er Injuries | 1 |
| Num Worker Injuries | 0 |
| Num Gp Injuries | 32 |
| Injure | 33 |
| Ignite Ind | Yes |
| Ignite Datetime | 2016-08-11 00:05:00 |
| How Extinguished | Local/state/federal Emergency Responder |
| Gas Consumed By Fire In Mcf | 38 |
| Explode Ind | No |
| Num Pub Evacuated | 200.0 |
| Incident Identified Datetime | 2016-08-11 00:36:00 |
| On Site Datetime | 2016-08-11 00:36:00 |
| Federal | No |
| Location Type | Private Property |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Inside A Building |
| Crossing | No |
| Pipe Facility Type | Investor Owned |
| System Part Involved | Other |
| System Part Details | Undetermined |
| Material Involved | Other |
| Material Details | Undetermined |
| Release Type | Other |
| Release Type Details | Undetermined |
| Class Location Type | Class 4 Location |
| Est Cost Oper Paid | 1650000.0 |
| Est Cost Prop Damage | 0.0 |
| Est Cost Emergency | 52336.0 |
| Est Cost Other | 0.0 |
| Gas Cost In Mcf | 3.83 |
| Est Cost Unintentional Release | 146.0 |
| Est Cost Intentional Release | 0.0 |
| Prpty | 1702482.0 |
| Commercial Affected | 0.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 30.0 |
| Num Persons Hosp Not Ovnght | 0.0 |
| Num Injured Treated By Emt | 0.0 |
| Num Resident Building Affctd | 3.0 |
| Num Business Building Affctd | 0.0 |
| Accident Psig | 20.0 |
| Normal Psig | 20.0 |
| Mop Psig | 25.0 |
| Mop Cfr Section | 192.619(A)(4) View CFR 49 §192 |
| Maop Established Date | 1955-01-01 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 | 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 Incident Cause |
| Cause Details | Unknown |
| Other Type | Unknown |
| Unknown Subtype | Investigation Complete, Cause Of Incident Unknown |
| Incident Unknown Comments | Cause Of Incident Is Undetermined. |
| Preparer Name | S****** B* M****** |
| Preparer Title | Manager Pipeline Safety Compliance And Quality |
| Preparer Email | S*******@w******.com |
| Preparer Telephone | 7037505558 |
| Local Contact Name | R****** F********** |
| Local Contact Email | R*****************@w******.com |
| Local Contact Telephone | 7036397825 |
| Authorizer Name | S****** P**** |
| Authorizer Title | Avp Safety Quality System Protection |
| Authorizer Telephone | 703-750-4586 |
| Authorizer Email | S*****@w******.com |
| Narrative | On august 10, 2016 an explosion and fire occurred at 8701 arliss street in silver spring, maryland. The national transportation safety board (ntsb) concluded that the probable cause of the explosion in building 8701 was the failure of an indoor mercury service regulator. Washington gas believes the evidence, including multiple sources of natural gas onsite that could have contributed to the incident, does not permit a conclusive determination of probable cause. Thus, for the purposes of this report, washington gas avers that the actual cause remains undetermined. Nonetheless, washington gas has implemented all safety recommendations promulgated by the ntsb with respect to the incident, including expedited removal of mercury service regulators remaining on the company's system. The maryland public service commission approved washington gas' expedited removal program on december 18, 2020. Operator note: reference part a, question 21.D, "no" is selected because option of "unknown" is not provided. |
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