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. 2008 Mar 13;116(6):727–733. doi: 10.1289/ehp.10994

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Mean risk against barrier depth (groundwater scenario). (A) Nonporous media followed by saturated soil. (B) Unsaturated soil (0.25 m) followed by saturated soil. (C) Unsaturated soil (0.5 m) followed by saturated soil.