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The liquid that collects in a leaching basin at landfill sites, known as leachate, serves to collect and transport contaminants that have leached from the waste materials. It is generated when water, including rainwater and snowmelt, percolates through the waste, dissolving various substances in the process. The leachate is then treated to prevent environmental contamination and protect groundwater and surface water resources. Proper management of leachate is crucial for minimizing the ecological impact of landfills.

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