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Human and Ecological Risk Assessment - Earthjustice

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Appendix KScreening Analysis ResultsChemicalTable K-4. CCW L<strong>and</strong>fill Leachate <strong>Human</strong> Health Screening Results:Groundwater-to-Surface-Water PathwayAnalytes Exceeding <strong>Risk</strong> Criteria 1Benchmark TypeHBN(mg/L)2002 L<strong>and</strong>fill Leachate90 th Percentile HQ (Cancer <strong>Risk</strong>)Arsenic Cancer 0.23 3.94E-01 (1.71E-05)Cadmium Noncancer 0.035 4.94E-02 1.41E+00Mercury Noncancer 3.85E-06 2.69E-03 7.00E+02Selenium Noncancer 0.038 1.76E-01 4.69E+00Thallium Noncancer 0.008 5.00E-02 6.29E+00Analytes Below <strong>Risk</strong> Criteria 1Antimony AWQ 4.3 2.61E-01 6.07E-02Arsenic Noncancer 0.71 3.94E-01 5.54E-01Beryllium Noncancer 1.00 1.58E-02 1.59E-02Chromium (III) Noncancer 23,700 2.00E-01 8.44E-06Chromium (VI) Noncancer 47 2.00E-01 4.22E-03Copper 2 AWQ 1.3 1.50E-01 1.15E-01Cyanide AWQ 222 6.32E-02 2.85E-04Molybdenum Noncancer 12 6.16E-01 5.20E-02Nickel Noncancer 237 3.09E-01 1.30E-03Zinc Noncancer 8.13 1.94E+00 2.38E-011<strong>Risk</strong> criteria are 1E-05 cancer risk or a hazard quotient (HQ) of 1E+00 for noncancer endpoints, applied to 90th percentileconcentrations.2Fish bioconcentration factor values for copper are zero. HBN based on National Ambient Water Quality Criteria.HBN = health-based number90th percentile = 90th percentile concentrationHQ = hazard quotientAWQ = National Ambient Water Quality CriteriaMCL = maximum contaminant levelApril 2010–Draft EPA document. K-4

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