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Landfill liners and covers are critical components in the design, operation, and closure of landfills. They serve the dual purpose of protecting the surrounding environment from contamination and ensuring the safe disposal of solid waste. In the broader context of waste disposal, liners and covers are engineering systems that act as barriers to the uncontrolled movement of leachate, landfill gas, and other contaminants that could potentially pollute groundwater, surface water, and soil. The proper design and implementation of these systems are essential to minimize environmental risks and comply with regulatory standards. A landfill liner is a barrier system installed at the base and sides of a landfill to restrict the migration of leachate into the surrounding soil and groundwater. Without an effective liner, hazardous substances present in municipal solid waste and industrial waste could percolate into the subsurface environment, resulting in serious environmental hazards. There are several types of liners, each with specific characteristics, performance levels, and applications. These liners can broadly be categorized into natural liners, synthetic liners, and composite liners. Natural liners generally consist of compacted clay or other low-permeability soils. Clay liners are effective because of their fine particle size and plasticity, which reduce permeability to leachate. A compacted clay liner typically has a thickness of 0.9 to 1.5 meters and a permeability coefficient of less than 1 x 10⁻⁷ cm/s. While natural liners are relatively inexpensive ______ __________ _____ _______ _____.
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