estimating landfill closure costs

October 14, 2020


When the Glades County Sanitary Landfill No. 2 closed, the 6.5-acre Subtitle D landfill provided an opportunity to monitor leachate generation under controlled conditions. With ever-increasing disposal rates at wastewater treatment facilities, and the possibility of wastewater treatment plants refusing to take leachate, studying leachate generation in a controlled environment provided invaluable information.

During the 20-year life span, the facility contained primarily municipal solid waste with a limited quantity of construction and demolition debris. Yard waste and vegetative waste was never landfilled.

During the final cover construction, the geomembrane was welded to the bottom lining system, preventing water from entering the landfill. Due to its small size, only a few passive vents were necessary, creating conditions to trap the landfill gas condensate generated in the landfill.

In this WasteAdvantage article Leachate Generation Trend After Closure of a Subtitle D Landfill, co-authors Ali Khatami and Myles Clewner discuss the leachate generation data collected along with the pre-existing and closed conditions. The authors provide a wealth of information about the leachate generation rate that makes up a significant part of the post-closure financial assurance cost estimate. The data collected provides the opportunity to use a more reliable leachate generation number for cost estimating and prevent over-estimating the leachate disposal cost for the entire 30- year post-closure period.

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Posted by Diane Samuels at 6:00 am