jim lapp city of edmonton swana northern lights chapter 2/19/2016lesson 11 1
DESCRIPTION
Post-Closure Care Objective Monitoring & maintenance a landfill and all its components until it is biologically stable 2/19/2016Lesson 11 3TRANSCRIPT
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Jim Lapp
City of Edmonton
SWANA Northern Lights Chapter
05/04/23Lesson 11 1
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Outline
Definitions Post-Closure Objectives Issues Post-closure Activities Minimizing Risk Financial Planning
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Post-Closure Care Objective
Monitoring & maintenance a landfill and all its components until it is biologically stable
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Post-Closure Period
Longest conventional landfills
Shorter Bio-reactor landfills
Minimal 25 to 30 years
Possible indefinite
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Issues
Settlement Cover erosion and failure Groundwater contamination Landfill gas emission & migration Leachate outbreaks Vegetation growth
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Environmental Risks
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Settlement
Breach of Final Cover Disrupts final use
activities Potential for
infiltration
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Cover Failures
•Desiccation•Shear settling•Rotation settling•Erosion•Slope failure
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Landfill Gas
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Leachate Outbreaks
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Plan For Closure in Design
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Active landfill operation Conceptual end-use plan
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Design to Reduce Risk
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Conventional Design
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Bioreactor Design
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Post-Closure Activities
Final cover maintenance Environmental
monitoring Operate leachate
management systems Operate gas
management systems Undertake remedial
activities Record Keeping
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Inspection & Monitoring Plan
Final Cover Inspections Spring and Fall
Drainage Systems After intense rainfalls
Groundwater 2 x per year
Landfill Gas Detection gov’d
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Vegetation Maintenance
Irrigation Weed control Grass cutting Replant damaged
areas
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Monitoring & Remediation
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Corrective Action
Groundwater Drainage systems Leachate seepages Corrective
response confirm investigate evaluate implement
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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
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In Summary
Plan early Design to reduce
liability Be prepared Financial
Security Funding
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