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Jim Lapp City of Edmonton SWANA Northern Lights Chapter 06/19/22 Lesson 11 1
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Jim Lapp
City of Edmonton
SWANA Northern Lights Chapter
05/04/23Lesson 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
05/04/23Lesson 11 3
Post-Closure Period
Longest conventional landfills
Shorter Bio-reactor landfills
Minimal 25 to 30 years
Possible indefinite
05/04/23Lesson 11 4
Issues
Settlement Cover erosion and failure Groundwater contamination Landfill gas emission & migration Leachate outbreaks Vegetation growth
05/04/23Lesson 11 5
Environmental Risks
05/04/23Lesson 11 6
Settlement
Breach of Final Cover Disrupts final use
activities Potential for
infiltration
05/04/23Lesson 11 7
05/04/23Lesson 11 8
Cover Failures
•Desiccation•Shear settling•Rotation settling•Erosion•Slope failure
Landfill Gas
05/04/23Lesson 11 9
Leachate Outbreaks
05/04/23Lesson 11 10
Plan For Closure in Design
05/04/23Lesson 11 11
Active landfill operation Conceptual end-use plan
Design to Reduce Risk
05/04/23Lesson 11 12
Conventional Design
05/04/23Lesson 11 13
Bioreactor Design
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05/04/23Lesson 11 15
Post-Closure Activities
Final cover maintenance Environmental
monitoring Operate leachate
management systems Operate gas
management systems Undertake remedial
activities Record Keeping
05/04/23Lesson 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
Vegetation Maintenance
Irrigation Weed control Grass cutting Replant damaged
areas
05/04/23Lesson 11 17
Monitoring & Remediation
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05/04/23Lesson 11 19
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
05/04/23Lesson 11 20
In Summary
Plan early Design to reduce
liability Be prepared Financial
Security Funding
05/04/23Lesson 11 21
