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Landfill Closure Issues. Stormwater Retention. Florida Regulations - must collect and detain runoff from first 1” of rainfall (for > 100 acres, 0.5” for < 100 acres) detain for 24 hrs. Stormwater Control. Direct surface water run-off away from the landfill . Stormwater Management.

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stormwater retention
Stormwater Retention
  • Florida Regulations -
    • must collect and detain runoff from first 1” of rainfall (for > 100 acres, 0.5” for < 100 acres)
    • detain for 24 hrs.
stormwater control
Stormwater Control

Direct surface water run-off away from the landfill

monitoring
Monitoring
  • Leachate head within landfill
  • leakage through landfill liner (groundwater)
  • ambient air quality
  • gas
  • leachate quality
  • stability of final cover
minimum groundwater monitoring
Minimum Groundwater Monitoring

One line of three (minimum) well down gradient from landfill perpendicular to groundwater flow, penetrating entire saturated thickness of aquifer (1/250 ft of landfill frontage at boundary of site or at surface water)

minimum groundwater monitoring7
Minimum Groundwater Monitoring
  • One well immediately adjacent to downgradient edge of filled area at point where leachate plume meets GW. Screened to intercept water table
  • one well in area upgradient from landfill
monitoring wells
Monitoring wells

Groundwater

Direction

Landfill

monitoring wells9
Monitoring Wells

Landfill

Water Table

Confining Unit

closure
Closure
  • financial assurance criteria
    • estimate cost of closure/post closure care
    • demonstrate financial assurance
      • cash
      • irrevocable letter of credit
      • trust funds with licensed trust company or state
      • surety bonds
final cover drainage design
Final Cover Drainage Design

Objective: To reduce pore water pressure, avoid seepage-induced instability and limit infiltration

post closure
Post closure
  • 30 years
  • maintain integrity of cover
  • maintain LCS
  • monitor GW
  • maintain gas monitoring system
thoughts on post closure
Thoughts on Post-Closure
  • 30-years may not be the right time
  • Can one ever “walk away”?
  • Must have a risk based approach to end
the end of post closure care
The End of Post-closure Care
  • Regulatory-stipulate 30 years is arbitrary
  • No clearly defined process on how to exit post-closure care period