Jim Lapp City of Edmonton SWANA Northern Lights Chapter 2/19/2016Lesson 11 1

Outline  Definitions  Post-Closure Objectives  Issues  Post-closure Activities  Minimizing Risk  Financial Planning

Post-Closure Care Objective  Monitoring & maintenance a landfill and all its components until it is biologically stable 2/19/2016Lesson 11 3

Post-Closure Period  Longest  conventional landfills  Shorter  Bio-reactor landfills  Minimal  25 to 30 years  Possible  indefinite 2/19/2016Lesson 11 4

Issues  Settlement  Cover erosion and failure  Groundwater contamination  Landfill gas emission & migration  Leachate outbreaks  Vegetation growth 2/19/2016Lesson 11 5

Environmental Risks 2/19/2016Lesson 11 6

Settlement  Breach of Final Cover  Disrupts final use activities  Potential for infiltration 2/19/2016Lesson 11 7

2/19/2016Lesson 11 8 Cover Failures Desiccation Shear settling Rotation settling Erosion Slope failure

Landfill Gas 2/19/2016Lesson 11 9

Leachate Outbreaks 2/19/2016Lesson 11 10

Plan For Closure in Design 2/19/2016Lesson Active landfill operationConceptual end-use plan

Design to Reduce Risk 2/19/2016Lesson 11 12

Conventional Design 2/19/2016Lesson 11 13

Bioreactor Design 2/19/2016Lesson 11 14

2/19/2016Lesson Post-Closure Activities  Final cover maintenance  Environmental monitoring  Operate leachate management systems  Operate gas management systems  Undertake remedial activities  Record Keeping

2/19/2016Lesson Inspection & Monitoring Plan  Final Cover Inspections  Spring and Fall  Drainage Systems  After intense rainfalls  Groundwater  2 x per year  Landfill Gas  Detection gov’d

Vegetation Maintenance  Irrigation  Weed control  Grass cutting  Replant damaged areas 2/19/2016Lesson 11 17

Monitoring & Remediation 2/19/2016Lesson 11 18

2/19/2016Lesson Corrective Action  Groundwater  Drainage systems  Leachate seepages  Corrective response  confirm  investigate  evaluate  implement

Financial Planning  GAAP – “Unfunded liabilities”  Estimate Closure Costs  Estimate Post-Closure Cost – 25 to 30 yr.  Invest in Reserves – finance from operating revenues  Private companies – assurance financing 2/19/2016Lesson 11 20

In Summary  Plan early  Design to reduce liability  Be prepared  Financial Security Funding 2/19/2016Lesson 11 21