Spill Response, Site Assessment and Remediation of a Significant - - PowerPoint PPT Presentation

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Spill Response, Site Assessment and Remediation of a Significant - - PowerPoint PPT Presentation

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Spill Response, Site Assessment and Remediation of a Significant Gasoline Release to Land, Resolute Bay, Nunavut Challenges and Successes in the approach to remediation in a Remote Community in the Canadian Arctic RPIC Montreal 2016 Rob

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RPIC Montreal 2016

Rob McCullough, Stantec Consulting Ltd. Nathanial Hutchinson, Anil Gupta Government of Nunavut, Petroleum Products Division January, 2016

Spill Response, Site Assessment and Remediation of a Significant Gasoline Release to Land, Resolute Bay, Nunavut

Challenges and Successes in the approach to remediation in a Remote Community in the Canadian Arctic

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Agenda

1 Background/Initial Assessment, 2011 2 Site Assessment 2012 3 Site Remediation 2012 - Present 4 Conclusions – Challenges, Successes and

Lessons Learned

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Background

  • Location of release
  • October, 2011
  • Est 87,000 L of gasoline
  • Valve failure – day tank
  • verfill

Areal View of Former and Current Tank Farm in Resolute, NU

1

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Site Conditions - Initial Challenges

  • Stantec on-site November 2011 to assess the release
  • 2 hours of daylight
  • Sub zero temperatures and multi-day blizzards
  • Heavy snow
  • Most contractors had returned to the south for the winter

Location of Horizontal Tanks

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SLIDE 5

Horizontal AST Surface Evaluation

  • Fuel ran down the side of the

tank and onto gravel

  • No definitive evidence of fuel
  • n the frozen ground
  • Uncertainty as to whether a

fuel spill occurred

  • Police investigation ongoing
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SLIDE 6

Snow in Catchment Basin

Snow in Catchment Basin was in excess of 4 m deep and made hand assessment difficult with no heavy equipment available, limited visibility of hydrocarbons Cold temperatures mitigated vapor detection

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SLIDE 7

Snow was 2 to 3 m deep Hand excavation

Assessment Work in 2012

2

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SLIDE 8

Rhodamine Dye Application

Applied 300 L of dye to the surface/subsurface

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Test Pits in Catchment Basin

Test pits Test pits excavated in catchment basin to assess the location of the fuel in the ice and snow

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  • Assessment of ice below the snow

for the presence of gasoline

  • Fingerprinting of fuel from

samples

Test Pits in Catchment Basin (2)

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SLIDE 11

Clean Ice Ice with Fuel

Ice with Fuel in Catchment Basin

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Gasoline

Up to 30 % gasoline by volume in melted sample

Melted Ice/Snow

Water

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Up to 30 % gasoline by volume in melted sample

Wildlife Hazards Bear Encounters

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Up to 30 % gasoline by volume in melted sample

Wildlife Hazards Bear Encounters

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SLIDE 15

Up to 30 % gasoline by volume in melted sample

Wildlife Hazards Bear Encounters

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SLIDE 16

Test pits excavated across tank farm area and down gradient locations

Third Phase of Assessment, July 2012

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Test pits Test pits excavated across sea lift staging area down gradient of site Very difficult to differentiate contaminants in soil

Third Phase of Assessment, July 2012

Staging area

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Site Remediation

3

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Silt Fence at High Water Mark

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Ocean Boom in Resolute Bay

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HDPE 60 mil welded liner

Cut Off Trench with HDPE Liner

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C u t

  • f

f T r e n c h

Perforated Drain Pipe in Trench

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Collection of water and phase separated product

Trenches Dug in Old Tank Farm

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Approximately 5000 m3 of impacted soil placed in on-site constructed cell

On-Site Containment Cell

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60 mil HDPE liner welded in the field

On-Site Containment Cell (2)

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SLIDE 26
  • Residual dye

below tanks

  • Permafrost bowl

under tanks

Remedial Excavation at ASTs

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SLIDE 27

Excavated to permafrost across impacted zone

Original AST location

Main Excavation at Tank Farm

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Main Excavation at Tank Farm (2)

Berm from original tank farm lined and keyed to permafrost

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Exposed shale Bedrock

Excavation on Road

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Backfilling of Road Excavation

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Backfilling of Tank Farm Excavation

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Reinstatement of ASTs

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Generator, frost-biter, and fuel for equipment

Remediation Support Equipment

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GAC Water Treatment System

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Effluent from Water Treatment

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Lessons Learned

4

  • Sometimes very difficult to assess a release in Arctic

conditions even when it should be obvious

  • Many Hazards to be aware of: cold temperatures,

communications, wildlife, safety

  • Equipment available in the south is not necessarily

available in remote Arctic location, need to improvise

  • Time lag on results and thus decisions
  • Very expensive in all aspects
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SLIDE 37

Tea + -50oC = Iced Tea

Conclusions

4

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Acknowledgements

  • Nathanial Hutchinson, Anil Gupta, Government of

Nunavut, Petroleum Products Division

  • Kristi Lowe, Director of Environmental Protection,

Department of the Environment Government of Nunavut

  • Patricio Fuentes, Regional Project Manager,

Community and Government Services, Baffin Region, Government of Nunavut

  • Patrick Kramers, Curtis Didham, Environmental

Enforcement Directorate, Enforcement Branch, Environment Canada

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SLIDE 39

Questions?

Robert McCullough, B.E.S., CET., CESA., EP Principal Stantec Dartmouth (902) 468-7777 Robert.mcculough@stantec.com