Exposed geomembrane covers (EGCs) have been used on landfills in place of more traditional soil-covered geomembranes. The design details and economic benefits of not using a soil cover have been well documented (Hullings 2007; Hullings 2009). This presentation focuses on the benefits of installing an EGC instead of intermediate soil cover. While an EGC for this application adds additional cost, it provides improved landfill gas capture, reduces the amount of storm water that infiltrates the landfill to create leachate, and reduces potential erosion. The capture of more gas can reduce odor and greenhouse gas emissions, while at the same time provide more methane for use in renewable fuel projects. The reduction in leachate has a direct impact on leachate treatment and disposal cost, which is becoming more expensive as options are becoming more limited. The enhanced soil erosion protection saves valuable soil from washing away while also protecting surface water. A case study details the benefits that operators may achieve.
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