A Closer Look at Post-Closure Leachate Production and Financial Assurance 2014 SWANA Florida Summer Conference

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Sophia Allison
5 years ago
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Conference Client Name Professional Engineering

1 A Closer Look at Post-Closure Leachate Production and Financial Assurance 2014 SWANA Florida Summer Conference Client Name Professional Engineering Services Project Title Here Mickey Pollman, MS July 28, 2014 Project No. XXX-XXXX Date Click to edit section Click to edit section Click to edit section

2 Overview Present Marion County s Financial Assurance Cost Estimate (FACE) Review Financial Assurance Requirements Calculate Accurate Post-Closure Leachate Management Costs Leachate production for 30-year long-term care period Leachate disposal costs Reduce Your Total Long-Term Care Costs Click Introduction to edit section Click Approach to edit section Click to Closing edit section

funds that could be available for needed projects Click

3 Goal Estimate accurate post-closure long-term care costs Underfunding going to the Board for more money Overfunding tying up funds that could be available for needed projects Click Introduction to edit section Click Approach to edit section Click to Closing edit section

4 Overview Present Marion County s Financial Assurance Cost Estimate (FACE) Review Financial Assurance Requirements Calculate Accurate Post-Closure Leachate Management Costs Leachate production for 30-year long-term care period Leachate disposal costs Reduce Your Long-Term Care Costs Click Introduction to edit section Click Approach to edit section Click to Closing edit section

5 Marion County s Estimates Changes in leachate disposal costs Completing Financial Assurance Cost Estimate (FACE) Forms Calculated 30-year longterm care costs Increased unfunded liability Click Introduction to edit section Click Approach to edit section Click to Closing edit section

6 Overview Present Marion County s Financial Assurance Cost Estimate (FACE) Review Financial Assurance Requirements Calculate Accurate Post-Closure Leachate Management Costs Leachate production for 30-year long-term care period Leachate disposal costs Reduce Your Total Long-Term Care Costs Click Introduction to edit section Click Approach to edit section Click to Closing edit section

Financial Assurance Review Calculate Post-Closure Cost Estimates Form 62-701.

7 Financial Assurance Review Calculate Post-Closure Cost Estimates Form (28) Closing Cost Annual Cost for Long-Term Care Total 30-year Long-Term Care Costs Annual cost adjustments Fund Landfill Management Escrow Account Closing costs First (or next) year long-term care at closing Self-imposed total long-term care Balance GASB 18 Long-Term Care Liability Total 30-year long-term care Financial Click Introduction Assurance to edit section Requirements FDEP Cost Click Approach to Estimates edit section Escrow Account Long-Term Click to Closing edit Care section Liability

8 Estimating Long-Term Care Costs Stormwater management Monitoring Gas system maintenance Leachate disposal Reporting Permitting Financial Click Assurance to edit section Requirements FDEP Cost Click to Estimates edit section Escrow Account Long-Term Click to edit Care section Liability

Click Assurance to edit section Requirements FDEP Cost Click to

9 Estimating Long-Term Care Costs Stormwater management Monitoring Gas system maintenance Leachate disposal Reporting Permitting Financial Click Assurance to edit section Requirements FDEP Cost Click to Estimates edit section Escrow Account Long-Term Click to edit Care section Liability

time Financial Assurance Requirements FDEP Cost Estimates Escrow Account

10 Estimating Long-Term Care Costs Frequent costs estimated yearly Contingency costs estimated as an annual average over longterm period Leachate quantities vary over time Financial Assurance Requirements FDEP Cost Estimates Escrow Account Long-Term Care Liability Click to edit section Click to edit section Click to edit section

long-term care period is too high Financial Assurance Requirements FDEP Cost Estimates

11 Estimating Leachate Costs First year leachate disposal costs are the highest Average annual leachate disposal costs for the first year are too low First year multiplied for total long-term care period is too high Financial Assurance Requirements FDEP Cost Estimates Escrow Account Long-Term Care Liability Click to edit section Click to edit section Click to edit section

Escrow Account Government Owners: First year of long-term care at time of closure Self-imposed total long-term care funding Private Owners: Total Long-Term Care Funding 62-701.630 Financial Assurance.

12 Escrow Account Government Owners: First year of long-term care at time of closure Self-imposed total long-term care funding Private Owners: Total Long-Term Care Funding Financial Assurance. (5) Landfill management escrow account (d) 3. For landfills not owned by a governmental agency, the long-term care costs shall be included in the closing cost estimates as specified in subparagraph 1. above; long-term care costs must be fully funded when the landfill closes. Financial Assurance Requirements FDEP Cost Estimates Escrow Account Long-Term Care Liability Click to edit section Click to edit section Click to edit section

13 Long-Term Care Liability GASB General Long-Term Liability Reported based on FDEP Form (28) FDEP Form (28) calculated as annual long-term care times long-term care period First year multiplied by long-term care period = Overestimated total long-term care liability GASB 18 Accounting for Municipal Solid Waste Landfill Closure and Post-Closure Care Costs (4) Landfill management escrow account (c) The cost of monitoring and maintaining the expected usable MSWLF area during the postclosure period. Financial Click Assurance to edit section Requirements FDEP Cost Click Estimates to edit section Escrow Account Long-Term Click to edit Care section Liability

14 Overview Present Marion County s Financial Assurance Cost Estimate (FACE) Review Financial Assurance Requirements Calculate Accurate Post-Closure Leachate Management Costs Leachate production for 30-year long-term care period Leachate disposal costs Reduce Your Total Long-Term Care Costs Click Introduction to edit section Click Approach to edit section Click to Closing edit section

Costs Dependent on leachate quantities Post-Closure Leachate Management Costs

15 Post-Closure Leachate Management Maintenance Costs Dependent on facilities Operations Costs Dependent on facilities Dependent on leachate quantities Disposal Costs Dependent on leachate quantities Post-Closure Leachate Management Costs Leachate Production Leachate Disposal Click to edit section Click to edit section Click to edit section

16 Post-Closure Leachate Production Closed landfill leachate data Environmental Protection Agency (EPA) published information HELP model Post-Closure Click to edit section Leachate Management Costs Click to edit Leachate section Production Leachate Click Disposal to edit section Costs

section Leachate Management Costs Click to edit Leachate

17 Closed Landfill Leachate Data No local closed lined landfills No long-term data Post-Closure Click to edit section Leachate Management Costs Click to edit Leachate section Production Leachate Click Disposal to edit section Costs

18 EPA Published Information Assessment and Recommendations for Improving the Performance of Waste Containment Systems EPA/600/R-02/099 December 2002 by Bonaparte, Daniel, and Koerner (from Abstract - page vii) (8) leachate generation rates decreased on average by a factor of four within one year after closure and by one order of magnitude two to four years after closure; within nine years of closure, leachate generation rates were negligible for the landfill cells evaluated in this study; Post-Closure Click to edit section Leachate Management Costs Click to edit Leachate section Production Leachate Click Disposal to edit section Costs

Post-Closure Click to edit section Leachate Management Costs Click

19 EPA Published Information Not representative of Florida landfills with inches of rain per year Not approved by FDEP Post-Closure Click to edit section Leachate Management Costs Click to edit Leachate section Production Leachate Click Disposal to edit section Costs

20 HELP Model HELP Model Parameters Representing Site Conditions: Waste volume and height at closure Bottom liner slope and collection pipe spacing Local daily rainfall data Model Scenarios: Open at full build-out to determine initial moisture content of the waste, soil, and geosynthetic bottom liner Closed for 30 years calibrate landfill volumes to match current leachate production Post-Closure Click to edit section Leachate Management Costs Click to edit Leachate section Production Leachate Click Disposal to edit section Costs

21 Post-Closure Leachate Production Default Waste Hydraulic Conductivity 1 x 10-3 cm / second 4.7 million gallons over 30 years Post-Closure Click to edit section Leachate Management Costs Click to edit Leachate section Production Leachate Click Disposal to edit section Costs

22 Post-Closure Leachate Production Waste Hydraulic Conductivity 2 x 10-4 cm / second 15.2 million gallons over 30 years Open Scenario Closed Scenario x 10-4 cm/sec = less leachate flows out before closure Post-Closure Click to edit section Leachate Management Costs Click to edit Leachate section Production Leachate Click Disposal to edit section Costs

23 Post-Closure Leachate Production Post-Closure Click to edit section Leachate Management Costs Click to edit Leachate section Production Leachate Click Disposal to edit section Costs

24 Post-Closure Leachate Production Post-Closure Click to edit section Leachate Management Costs Click to edit Leachate section Production Leachate Click Disposal to edit section Costs

25 Post-Closure Leachate Production Post-Closure Click to edit section Leachate Management Costs Click to edit Leachate section Production Leachate Click Disposal to edit section Costs

26 Post-Closure Leachate Production Post-Closure Click to edit section Leachate Management Costs Click to edit Leachate section Production Leachate Click Disposal to edit section Costs

27 Post-Closure Leachate Production Post-Closure Click to edit section Leachate Management Costs Click to edit Leachate section Production Leachate Click Disposal to edit section Costs

28 Construction Leachate Disposal Costs Total Leachate Production (million gallons) Leachate Disposal Costs ($0.10/gallon) First Year of Long-Term Care Total LTC = First Year x 30 Years EPA Model FDEP Approved HELP Model $280,000 $8,400,000 $590,000 $1,520,000 Total LTC Savings $6,880,000 Post-Closure Click to edit section Leachate Management Costs Click to edit Leachate section Production Leachate Click Disposal to edit section Costs

29 Overview Present Marion County s Financial Assurance Cost Estimate (FACE) Review Financial Assurance Requirements Calculate Accurate Post-Closure Leachate Management Costs Leachate production for 30-year long-term care period Leachate disposal costs Reduce Your Total Long-Term Care Costs Click Introduction to edit section Click Approach to edit section Click to Closing edit section

30 Financial Assurance Adequately fund first year of long-term care Account for actual leachate production and disposal costs Accurately estimate 30-year long-term care costs FDEP approved Site specific Prevent over-estimating total 30-year long-term care liability Landfill Management Escrow Account Total Long-Term Care Liability Click Introduction to edit section Click Approach to edit section Click to Closing edit section

31 Financial Assurance Are you adequately funded for the first year of long-term care? Did you account for actual leachate production and disposal costs? Did you estimate 30-year long-term care costs based on the first year of long-term care? Click Introduction to edit section Click Approach to edit section Click to Closing edit section

32 Financial Assurance Are you adequately funded for the first year of long-term care? Did you account for actual leachate production and disposal costs? Did you estimate 30-year long-term care costs based on the first year of long-term care? Landfill Management Escrow Account Total Long-Term Care Liability Click Introduction to edit section Click Approach to edit section Click to Closing edit section

33 Click to edit section Click to edit section Click to edit section

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