How Landfills Work
science.howstuffworks.com/environmental/green-science/landfill.htm
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composite liner on top of 2 feet (0.61 meters) of compacted clay soil on the bottom and sides
systems to capture leachate, the water that percolates down through the trash, before it can contaminate groundwater.
groundwater testing wells to make sure that pollution isn't escaping.
must use federally approved operating practices for handling the trash, which include compacting and covering it frequently with several inches of soil.
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