Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2019-05-17 — TX
Operator
Enbridge Pipelines (Southern Lights) L.l.c.
Cause
Equipment Failure
Commodity
Refined And/or Petroleum Product (Non-Hvl) Which Is A Liquid At Ambient Conditions
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$24,170
Incident datetime
2019-05-17 11:45
Report number
Location
TX
Narrative
On april 26, 2019, while completing a routine site visit, an odor was noticed at enbridge's valve site, mp 313. Four gas meter readings were not detected, and there was no visible product. A few days later, probing in the area was completed, vapors not being detected. On may 4, 2019 a consultant was hired to conduct hand auger soil borings to collect soil and vapor samples 4 feet below grade. Groundwater was not encountered but data indicated vapors that were likely from diluent, suggesting a line 13 valve issue. On may 15, 2019 excavation began at the line 13 valve, exposing the service piping. On may 17, 2019 a loose elbow on the body bleed piping was identified as the source of the release. A temporary repair was made until a line 13 outage could be scheduled. On june 2, 2019 the elbow was replaced and the vertical portion of the service piping reduced in length and rethreaded. At the end of may 2019, a plan was developed to perform additional work based on lab reports confirming impacted soils that remained in the excavation. This plan was carried out in october/november 2019, at which time samples exceeded state criteria. An additional plan was to execute a soil bore in march 2020 at which time the project was put on hold due to the covid pandemic. The soil bore took place in july 2020. The results confirmed impact to groundwater, and proper notifications to the wisconsin dnr were made. Environment worked with their contractor to determine the next steps for remediation. On august 25, 2020, it was determined that the cost for additional remediation work would exceed the $50k threshold and require an nrc notification. The initial nrc notification was completed on august 25, 2020 at 1:19 pm cdt (report #1285561) and the 48-hour update was completed on august 27, 2020 at 11:48 am cdt (report #1285729). Contractors were hired to assist with the remediation of the site to define the extent of groundwater impacts. Twenty-six soil borings were completed, and eight monitoring wells were installed across the site to perform quarterly groundwater monitoring. The remediation work is being completed under the guidance of the wdnr remediation and redevelopment program. Approximately 130.18 tons of contaminated soil and slurry have been disposed of at an approved landfill site. Enbridge consultants and contractors completed the supplemental site investigation in december 2021 that included further soil sampling and analysis of the release area and the installation of remediation wells to recover free product that was identified as a result of these supplemental site investigation activities. Based on the data collected, the volume out calculation was revised to approximately 189 barrels. This was reported to the wdnr on march 16, 2022, as part of the supplemental site investigation report. An automated product recovery system was operated from september to november 2021 and will be recommissioned in april 2022. Volume recovered to date is 29 barrels (12 via excavation and 17 via product recovery). Quarterly groundwater monitoring is on-going to determine trends in groundwater concentrations over time and to assess the potential need for further remedial action. Results of the supplemental site investigation suggest that soil impacts and free product are largely constrained to a small area beneath the release source. Groundwater impacts exist primarily on enbridge row and enbridge owned property, with some groundwater impacts in the nearby road row. No potable wells or surface water receptors have been impacted by this release. Enbridge continues to work with the wdnr and will be submitting a remedial actions options report (roar) and a response action plan (rap) in 2022.
Detailed record list
Report Received Date
2020-09-24 00:00:00
Iyear
2019
Report Number
20200262
Supplemental Number
36496
Report Type
Supplemental Final
Operator Id
32502
Name
Enbridge Pipelines (Southern Lights) L.l.c.
Operator Street Address
915 N Eldridge Parkway, Suite 1100
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77079
Local Datetime
2019-05-04 13:30:00
Location Latitude
42.910479
Location Longitude
-88.874779
Commodity Released Type
Refined And/or Petroleum Product (Non-Hvl) Which Is A Liquid At Ambient Conditions
Commodity Subtype
Other
Commodity Details
Diluent
Unintentional Release Bbls
189
Recovered Bbls
29
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
Incident Identified Datetime
2019-05-17 11:45:00
System Part Involved
Onshore Pipeline, Including Valve Sites
On Off Shore
Onshore
On Site Datetime
2019-05-04 13:30:00
Nrc Rpt Datetime
2020-08-25 13:19:00
Nrc Rpt Num
1285561
Ignite Ind
No
Num Pub Evacuated
0
Pipe Fac Name
Line 13
Segment Name
Blackhawk Island Rd Mp 313.96
Onshore State Abbreviation
Wi
Onshore Postal Code
53538
Onshore City Name
Fort Atkinson
Onshore County Name
Jefferson
Designated Location
Milepost
Designated Name
313.96
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
180
Crossing
No
Pipe Facility Type
Interstate
Item Involved
Other
Item Involved Details
Auxiliary Valve Piping
Installation Year
2007
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Connection Failure
Wildlife Impact Ind
No
Soil Contamination
Yes
Long Term Assessment
Yes
Remediation Ind
Yes
Groundwater Remed Ind
Yes
Water Contam Ind
Yes
Groundwater Contam Ind
Yes
Amount Released
176
Rel Water Name
Groundwater
Could Be Hca
Yes
Commodity Reached Hca
Yes
Other Pop Ind
Yes
Other Pop Yes No
Yes
Est Cost Oper Paid
28900
Est Cost Gas Released
1596
Est Cost Prop Damage
24170
Est Cost Emergency
216
Est Cost Environmental
166376
Est Cost Other
0
Prpty
221258
Accident Psig
416
Mop Psig
1260
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Internal Inspection Ind
Yes
Operation Complications Ind
No
Pipeline Function
> 20% Smys Regulated Transmission
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
No
Cpm In Place Ind
Yes
Cpm Operating Ind
Yes
Cpm Functional Ind
Yes
Cpm Detection Ind
No
Cpm Conf Ind
No
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
Lack of control center involvement. Release was identified by field personnel.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Threaded Connection/coupling Failure
Eq Failure Type
Threaded Connection/coupling Failure
Other Stripped Ind
Threaded Fitting
Eq Additional Other Ind
Yes
Eq Additional Other Details
Normal Wear And Tear
Preparer Name
S**** S****
Preparer Title
Sr Compliance Analyst
Preparer Email
S**********@e*******.com
Preparer Telephone
218-206-5872
Prepared Date
2022-03-25 00:00:00
Authorizer Name
S**** D*****
Authorizer Telephone
715-718-1236
Authorizer Title
Supervisor Us Pipeline Compliance
Authorizer Email
S************@e*******.com
Narrative
On april 26, 2019, while completing a routine site visit, an odor was noticed at enbridge's valve site, mp 313. Four gas meter readings were not detected, and there was no visible product. A few days later, probing in the area was completed, vapors not being detected. On may 4, 2019 a consultant was hired to conduct hand auger soil borings to collect soil and vapor samples 4 feet below grade. Groundwater was not encountered but data indicated vapors that were likely from diluent, suggesting a line 13 valve issue. On may 15, 2019 excavation began at the line 13 valve, exposing the service piping. On may 17, 2019 a loose elbow on the body bleed piping was identified as the source of the release. A temporary repair was made until a line 13 outage could be scheduled. On june 2, 2019 the elbow was replaced and the vertical portion of the service piping reduced in length and rethreaded. At the end of may 2019, a plan was developed to perform additional work based on lab reports confirming impacted soils that remained in the excavation. This plan was carried out in october/november 2019, at which time samples exceeded state criteria. An additional plan was to execute a soil bore in march 2020 at which time the project was put on hold due to the covid pandemic. The soil bore took place in july 2020. The results confirmed impact to groundwater, and proper notifications to the wisconsin dnr were made. Environment worked with their contractor to determine the next steps for remediation. On august 25, 2020, it was determined that the cost for additional remediation work would exceed the $50k threshold and require an nrc notification. The initial nrc notification was completed on august 25, 2020 at 1:19 pm cdt (report #1285561) and the 48-hour update was completed on august 27, 2020 at 11:48 am cdt (report #1285729). Contractors were hired to assist with the remediation of the site to define the extent of groundwater impacts. Twenty-six soil borings were completed, and eight monitoring wells were installed across the site to perform quarterly groundwater monitoring. The remediation work is being completed under the guidance of the wdnr remediation and redevelopment program. Approximately 130.18 tons of contaminated soil and slurry have been disposed of at an approved landfill site. Enbridge consultants and contractors completed the supplemental site investigation in december 2021 that included further soil sampling and analysis of the release area and the installation of remediation wells to recover free product that was identified as a result of these supplemental site investigation activities. Based on the data collected, the volume out calculation was revised to approximately 189 barrels. This was reported to the wdnr on march 16, 2022, as part of the supplemental site investigation report. An automated product recovery system was operated from september to november 2021 and will be recommissioned in april 2022. Volume recovered to date is 29 barrels (12 via excavation and 17 via product recovery). Quarterly groundwater monitoring is on-going to determine trends in groundwater concentrations over time and to assess the potential need for further remedial action. Results of the supplemental site investigation suggest that soil impacts and free product are largely constrained to a small area beneath the release source. Groundwater impacts exist primarily on enbridge row and enbridge owned property, with some groundwater impacts in the nearby road row. No potable wells or surface water receptors have been impacted by this release. Enbridge continues to work with the wdnr and will be submitting a remedial actions options report (roar) and a response action plan (rap) in 2022.
| Report Received Date | 2020-09-24 00:00:00 |
|---|---|
| Iyear | 2019 |
| Report Number | 20200262 |
| Supplemental Number | 36496 |
| Report Type | Supplemental Final |
| Operator Id | 32502 PHMSA Enforcement |
| Name | Enbridge Pipelines (Southern Lights) L.l.c. |
| Operator Street Address | 915 N Eldridge Parkway, Suite 1100 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77079 |
| Local Datetime | 2019-05-04 13:30:00 |
| Location Latitude | 42.910479 Google Maps OpenStreetMap |
| Location Longitude | -88.874779 Google Maps OpenStreetMap |
| Commodity Released Type | Refined And/or Petroleum Product (Non-Hvl) Which Is A Liquid At Ambient Conditions |
| Commodity Subtype | Other |
| Commodity Details | Diluent |
| Unintentional Release Bbls | 189 |
| Recovered Bbls | 29 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| Incident Identified Datetime | 2019-05-17 11:45:00 |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| On Off Shore | Onshore |
| On Site Datetime | 2019-05-04 13:30:00 |
| Nrc Rpt Datetime | 2020-08-25 13:19:00 |
| Nrc Rpt Num | 1285561 NRC Report How to search |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Line 13 |
| Segment Name | Blackhawk Island Rd Mp 313.96 |
| Onshore State Abbreviation | Wi |
| Onshore Postal Code | 53538 |
| Onshore City Name | Fort Atkinson |
| Onshore County Name | Jefferson |
| Designated Location | Milepost |
| Designated Name | 313.96 |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 180 |
| Crossing | No |
| Pipe Facility Type | Interstate |
| Item Involved | Other |
| Item Involved Details | Auxiliary Valve Piping |
| Installation Year | 2007 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Connection Failure |
| Wildlife Impact Ind | No |
| Soil Contamination | Yes |
| Long Term Assessment | Yes |
| Remediation Ind | Yes |
| Groundwater Remed Ind | Yes |
| Water Contam Ind | Yes |
| Groundwater Contam Ind | Yes |
| Amount Released | 176 |
| Rel Water Name | Groundwater |
| Could Be Hca | Yes |
| Commodity Reached Hca | Yes |
| Other Pop Ind | Yes |
| Other Pop Yes No | Yes |
| Est Cost Oper Paid | 28900 |
| Est Cost Gas Released | 1596 |
| Est Cost Prop Damage | 24170 |
| Est Cost Emergency | 216 |
| Est Cost Environmental | 166376 |
| Est Cost Other | 0 |
| Prpty | 221258 |
| Accident Psig | 416 |
| Mop Psig | 1260 |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Internal Inspection Ind | Yes |
| Operation Complications Ind | No |
| Pipeline Function | > 20% Smys Regulated Transmission |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | No |
| Cpm In Place Ind | Yes |
| Cpm Operating Ind | Yes |
| Cpm Functional Ind | Yes |
| Cpm Detection Ind | No |
| Cpm Conf Ind | No |
| 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 | Lack of control center involvement. Release was identified by field personnel. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Threaded Connection/coupling Failure |
| Eq Failure Type | Threaded Connection/coupling Failure |
| Other Stripped Ind | Threaded Fitting |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Normal Wear And Tear |
| Preparer Name | S**** S**** |
| Preparer Title | Sr Compliance Analyst |
| Preparer Email | S**********@e*******.com |
| Preparer Telephone | 218-206-5872 |
| Prepared Date | 2022-03-25 00:00:00 |
| Authorizer Name | S**** D***** |
| Authorizer Telephone | 715-718-1236 |
| Authorizer Title | Supervisor Us Pipeline Compliance |
| Authorizer Email | S************@e*******.com |
| Narrative | On april 26, 2019, while completing a routine site visit, an odor was noticed at enbridge's valve site, mp 313. Four gas meter readings were not detected, and there was no visible product. A few days later, probing in the area was completed, vapors not being detected. On may 4, 2019 a consultant was hired to conduct hand auger soil borings to collect soil and vapor samples 4 feet below grade. Groundwater was not encountered but data indicated vapors that were likely from diluent, suggesting a line 13 valve issue. On may 15, 2019 excavation began at the line 13 valve, exposing the service piping. On may 17, 2019 a loose elbow on the body bleed piping was identified as the source of the release. A temporary repair was made until a line 13 outage could be scheduled. On june 2, 2019 the elbow was replaced and the vertical portion of the service piping reduced in length and rethreaded. At the end of may 2019, a plan was developed to perform additional work based on lab reports confirming impacted soils that remained in the excavation. This plan was carried out in october/november 2019, at which time samples exceeded state criteria. An additional plan was to execute a soil bore in march 2020 at which time the project was put on hold due to the covid pandemic. The soil bore took place in july 2020. The results confirmed impact to groundwater, and proper notifications to the wisconsin dnr were made. Environment worked with their contractor to determine the next steps for remediation. On august 25, 2020, it was determined that the cost for additional remediation work would exceed the $50k threshold and require an nrc notification. The initial nrc notification was completed on august 25, 2020 at 1:19 pm cdt (report #1285561) and the 48-hour update was completed on august 27, 2020 at 11:48 am cdt (report #1285729). Contractors were hired to assist with the remediation of the site to define the extent of groundwater impacts. Twenty-six soil borings were completed, and eight monitoring wells were installed across the site to perform quarterly groundwater monitoring. The remediation work is being completed under the guidance of the wdnr remediation and redevelopment program. Approximately 130.18 tons of contaminated soil and slurry have been disposed of at an approved landfill site. Enbridge consultants and contractors completed the supplemental site investigation in december 2021 that included further soil sampling and analysis of the release area and the installation of remediation wells to recover free product that was identified as a result of these supplemental site investigation activities. Based on the data collected, the volume out calculation was revised to approximately 189 barrels. This was reported to the wdnr on march 16, 2022, as part of the supplemental site investigation report. An automated product recovery system was operated from september to november 2021 and will be recommissioned in april 2022. Volume recovered to date is 29 barrels (12 via excavation and 17 via product recovery). Quarterly groundwater monitoring is on-going to determine trends in groundwater concentrations over time and to assess the potential need for further remedial action. Results of the supplemental site investigation suggest that soil impacts and free product are largely constrained to a small area beneath the release source. Groundwater impacts exist primarily on enbridge row and enbridge owned property, with some groundwater impacts in the nearby road row. No potable wells or surface water receptors have been impacted by this release. Enbridge continues to work with the wdnr and will be submitting a remedial actions options report (roar) and a response action plan (rap) in 2022. |
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