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Human and Ecological Risk Assessment - Earthjustice

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Appendix LTime to Peak Concentration at Receptor Well10090807060Percentile504030No LinerClay Liner201000 1000 2000 3000 4000 5000 6000 7000 8000Time to Peak Concentration (years)35.6% of composite liner results have no infiltration <strong>and</strong> are not plotted on this graph.Figure L-12. Time to peak distribution for cobalt: surface impoundments, all waste types,shorter time frame.1009080Percentile70605040No LinerClay LinerComposite Liner30201000 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000Time to Peak Concentration (years)73% of composite liner results have no infiltration <strong>and</strong> are not plotted on this graph.Figure L-13. Time to peak distribution for selenium IV: l<strong>and</strong>fills, all waste types.April 2010–Draft EPA document. L-9

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