Parts of a Municipal Solid Waste Landfill Electricity generator building Landfill Cap - when landfill is closed Leachate Tank Vegitation Soil Gravel & Drainage When a landfill is full, a layer of soil, plastic and clay seal in trash. Pipes collect methane gas to flare or use as fuel. Gas Collector Plastic Liner Clay Groundwater monitoring well for leachate Methane gas recovery well Trash Soil monitoring well for leachate and gas Landfill components - below trash Trash Groundwater Soil (at some landfills) Gravel & Drainage Leachate Collection Pipe Geo Textile Mat Leachate collection systems can be gravity fed or pumped into tanks or retention ponds for temporary storgage before treatment. Plastic Liner Clay P2Pays.org Wastenotnc.org Ground Water - Water that flows beneath the ground and needs to be protected. Compacted Clay - A type of soil that is nearly impermeable when compacted. Plastic Liner – A puncture-resistant plastic layer. Leachate Collection Pipe – Water that percolates through the landfill is called leachate and may contain harmful substances that needs to be separated from groundwater. Geotextile Mat – A mat that allows water to percolate through to the leachate collection system and protects liner from tearing or puncturing. Gravel and Drainage Layer- Stones and rock that help filter the leachate. Soil - The final layer before trash is put into the landfill.