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

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

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

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

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

6. Environmental Risks 2/19/2016Lesson 11 6

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

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

9. Landfill Gas 2/19/2016Lesson 11 9

10. Leachate Outbreaks 2/19/2016Lesson 11 10

11. Plan For Closure in Design 2/19/2016Lesson 11 11 Active landfill operationConceptual end-use plan

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

13. Conventional Design 2/19/2016Lesson 11 13

14. Bioreactor Design 2/19/2016Lesson 11 14

15. 2/19/2016Lesson 11 15 Post-Closure Activities  Final cover maintenance  Environmental monitoring  Operate leachate management systems  Operate gas management systems  Undertake remedial activities  Record Keeping

16. 2/19/2016Lesson 11 16 Inspection & Monitoring Plan  Final Cover Inspections  Spring and Fall  Drainage Systems  After intense rainfalls  Groundwater  2 x per year  Landfill Gas  Detection gov’d

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

18. Monitoring & Remediation 2/19/2016Lesson 11 18

19. 2/19/2016Lesson 11 19 Corrective Action  Groundwater  Drainage systems  Leachate seepages  Corrective response  confirm  investigate  evaluate  implement

20. 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

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