Corporate responsibility

Resthaven release

Continued cleanup of condensate release near Resthaven

On June 9, 2016, a condensate release was discovered at a pipeline right of way near the Resthaven gas plant, 65 km northeast of Grande Cache, Alberta. Further investigation by the operator of the plant at the time revealed the presence of condensate on nearby Webb Creek. Since the incident, the pipeline has remained shut down and isolated, and steps have been taken to mitigate any environmental impact. There are no residents in the impacted area and there is no threat to public safety.

On May 17, 2017, as part of its purchase of assets in the Deep Basin in Alberta and British Columbia, Cenovus acquired the previous operator’s stake in the Resthaven gas plant and has since assumed management of the cleanup process for the 2016 condensate release.

Updates:

Steps taken January 12, 2018 to February 13, 2018

  • Continued weekly inspections to assess Seeps A through E, recovery culverts, Tributary 1 as far as the engineered dam, the engineered dam and the confluence with Webb Creek
  • Completed installation of passive skimmers in groundwater monitoring wells 16-1b, 16-12, 16-18 and 16-21 on January 19
  • Completed surface water monitoring of select locations on February 2 and 3

Planned actions for February 14, 2018 to March 14, 2018

(Subject to weather conditions)

  • Collect incidental wildlife information, if observed, and by remote camera
  • Continue conducting weekly inspections of Seeps A through E, recovery culverts, the passive skimmers, Tributary 1 as far as the engineered dam, the engineered dam and the confluence with Webb Creek
  • Conduct winter groundwater monitoring event and February surface water monitoring at select locations
  • Prepare for installation of sediment control structure in Tributary 1

Steps taken December 13, 2017 to January 11, 2018

  • Continued weekly inspections to assess Seeps A through E, recovery culverts, Tributary 1 as far as the engineered dam, the engineered dam and the confluence with Webb Creek
  • Completed installation of groundwater recovery wells on December 21, 2017. The recovery wells were sampled on January 6, 2018

Planned actions for January 12, 2018 to February 14, 2018

(Subject to weather conditions)

  • Collect incidental wildlife information, if observed, and by remote camera
  • Continue conducting weekly inspections of Seeps A through E, recovery culverts, Tributary 1 as far as the engineered dam, the engineered dam and the confluence with Webb Creek
  • Conduct winter groundwater monitoring event and monthly surface water monitoring at select locations

Steps taken November 14, 2017 to December 12, 2017

  • Completed site winterization
  • Demobilized daily crew on November 19
  • Initiated weekly inspections following daily crew demobilization to assess Seeps A through E, recovery culverts, Tributary 1 as far as the engineered dam, the engineered dam and the confluence
  • Conducted final wildlife fence inspection for the season on November 15
  • Collected groundwater samples from recovery culverts and Seep E
  • Continued surface water and groundwater quality monitoring at select sites prior to daily crew demobilization
  • Began installing recovery wells
  • Delivered risk assessment report to the Alberta Energy Regulator (AER) on December 1

Planned actions for December 13, 2017 to January 14, 2018

(Subject to weather conditions)

  • Collect incidental wildlife information, if observed, and by remote camera
  • Finalize 2017 activity summary report and risk management plan to present to AER
  • Continue conducting weekly inspections of Seeps A through E, recovery culverts, Tributary 1 as far as the engineered dam, the engineered dam and the confluence; may reduce site inspection frequency to bi-weekly in 2018 if site conditions are stable
  • Finish installing recovery wells

Steps taken October 12, 2017 to November 13, 2017

  • Continued containment and clean-up operations:
    • Continued to explore alternate means of containment for long term site management and implement a monitoring program
  • Continued surface water and groundwater quality monitoring at select sites
  • Continued collection of incidental wildlife information along fence and creek
  • Continued waste management
  • Continued general site maintenance
  • Continued underflow dam operation
  • Completed Shoreline Cleanup Assessment Technique (SCAT) closing audits and post assessment sediment sampling
  • Continued with site winterization
  • Met with the Alberta Energy Regulator (AER) on November 6, 2017 to present risk assessment and risk management plan

Planned actions for November 14, 2017 to December 14, 2017

(Subject to weather conditions)

  • Recurring activities: Water Treatment System (WTS) shutdown monitoring, download trail camera photos, skim as needed in Operating Area 1 (OA1) and OA2
  • Collect incidental wildlife information, if observed, and by remote camera
  • Complete site winterization
  • Refine remediation and risk management plan to present to AER
  • Begin conducting weekly inspections
Steps taken September 15, 2017 to October 12, 2017
  • Continued containment and clean-up operations:
    • Continued fluid recovery from seeps via trenches and recovery culverts to September 19
    • Assessed the importance of running the water treatment system for protection of environmental receptors, as per Alberta Energy Regulator (AER) approval.
  • Continued surface water quality monitoring at select sites
  • Continued collection of incidental wildlife information along fence and creek
  • Completed the multiphase extraction pilot test
  • Continued waste management
  • Continued general site maintenance
  • Continued underflow dam operation
  • Completed Shoreline Cleanup Assessment Technique (SCAT) work
  • Removed wildlife deterrents and fencing in Operating Area 2 (OA2) after receiving approval from Alberta Environment and Parks
  • Completed a supplementary sediment sampling program to support the risk assessment 
  • Completed a SCAT surface water sampling program to support the risk assessment
  • Completed the fall groundwater monitoring program

Planned actions for October 13, 2017 to November 14, 2017

(Subject to weather conditions)

  • Recurring activities: collecting water samples, download trail camera photos weekly, skim peat/sheen as needed in Tributary 1 and Webb Creek
  • Collect incidental wildlife information, if observed, and by remote camera
  • Complete weekly fence assessments
  • Monitor erosion and install controls and mitigation measures, as needed
  • Complete site winterization
  • Meet with AER to discuss draft risk assessment and long term remediation plan
Steps taken August 15, 2017 to September 14, 2017
  • Continued containment and cleanup operations, including fluid recovery from seeps via trenches and recovery culverts
  • Continued surface water quality monitoring at select sites
  • Continued collection of incidental wildlife information along fence and creek
  • Continued operation of the water gathering and treatment system
  • Continued waste management
  • Continued general site maintenance
  • Continued underflow dam operation
  • Completed the multiphase extraction pilot test on select monitoring wells in Operating Area 1 (OA1)
  • Completed benthic and sediment sampling program in OA1 and OA2 in support of developing a long-term remediation and risk management strategy
  • Completed Shoreline Cleanup Assessment Technique (SCAT) work in OA2 and continued SCAT work in OA1
  • Received AER approval to remove wildlife deterrents and fencing in OA2 following completion of SCAT work

Planned actions for September 15, 2017 to October 14, 2017

(Subject to weather conditions)

  • Recurring activities: collect water samples, operate Water Treatment System (WTS), download trail camera photos weekly, skim peat/sheen as needed in OA1 and OA2
  • Continue and finish a modified SCAT program in OA1
  • Conduct fall groundwater monitoring event (late September)
  • Collect incidental wildlife information, if observed, and by remote camera
  • Complete weekly fence assessments
  • Monitor erosion and install controls and mitigation measures, as needed
  • Remove fencing and all wildlife deterrents in OA2
  • Develop a monitoring plan and conduct a trial shut down of the WTS to ascertain the importance of running the WTS to the protection of environmental receptors
  • Begin to winterize the site
  • Conduct a supplementary sediment sampling program in OA2 to support the risk assessment
  • Complete the draft risk assessment report
  • Build on risk assessment results by developing a long-term remediation and risk management strategy for the site