Hydraulic Equivalency Comparison
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چکیده
The Code of Federal Regulations (CFR) defines performance based technical criteria for solid waste landfill liner design alternatives in terms of predicted impacts to groundwater as the basis for approval by the Director of an approved State. This approach first requires the designer to estimate the amount of leakage through the liner system into the unsaturated subsurface vadose zone below the lining system. Next, the movement of leachate from leaks in the liner system to an assumed point of compliance (e.g. a groundwater monitoring well) is modeled. Analysis of this kind is required in order to demonstrate that potential leakage through the alterantive liner system will keep groundwater concentrations of certain chemical constituents below regulatory thresholds (often called Maximum Contaminant Levels, or MCL’s) at the point of compliance.
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