Landfill Gas and Biogas Technical Division

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Looking for info on use of permeable caps or alternative capping schedules for landfills

By John Welch posted 09-10-2014 05:32 PM

  

In Wisconsin, current code requires landfill operators to install final cap within two years after an area of the landfill has reached final waste grades.  We have seen this lead to decreased gas production and presumably extended organic stability timeframes at several landfills statewide.  Also, we have seen sites with substantial settlement within the first 5-7 years that are unable to refill the settlement airspace because it was capped within 2 years.  As a result, we are doing some research into the state of the industry regarding permeable caps and/or delayed capping schedules. 

What are the capping requirements in other parts of North America?
Have you seen permeable caps allowed in other States/areas?
Do other States/areas allow alternative or delayed capping schedules?

Thank you for any information you can share!

Respectfully,
John Welch, P.E.
Solid Waste Manager
Dane County Public Works, Solid Waste Division
welch@countyofdane.com
office: 608-267-8815
cell: 608-516-4154

 

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