1 / 15

Landfill Closure Issues

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.

zulema
Download Presentation

Landfill Closure Issues

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Landfill Closure Issues

  2. 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.

  3. Stormwater Control Direct surface water run-off away from the landfill

  4. Stormwater Management

  5. Monitoring • Leachate head within landfill • leakage through landfill liner (groundwater) • ambient air quality • gas • leachate quality • stability of final cover

  6. 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)

  7. 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

  8. Monitoring wells Groundwater Direction Landfill

  9. Monitoring Wells Landfill Water Table Confining Unit

  10. 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

  11. Final Cover – Water Movement

  12. Final Cover Drainage Design Objective: To reduce pore water pressure, avoid seepage-induced instability and limit infiltration

  13. Post closure • 30 years • maintain integrity of cover • maintain LCS • monitor GW • maintain gas monitoring system

  14. 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

  15. The End of Post-closure Care • Regulatory-stipulate 30 years is arbitrary • No clearly defined process on how to exit post-closure care period

More Related