Human and Ecological Risk Assessment - Earthjustice

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Section 4.0Risk Characterization50th Percentile Risk Results by CCW Type: Landfills,Groundwater-to-Drinking-Water Pathway (continued)ChemicalUnlined Units50th Percentile HQ or Cancer Risk Value aNoncancerClay-Lined UnitsComposite-LinedUnitsAluminum 4E-06 2E-09 0Antimony 0.05 0.02 0Barium 5E-05 7E-07 0Boron 8E-03 3E-03 0Cadmium 0.02 4E-03 0Cobalt 2E-05 0 0Lead (MCL) b 0.01 2E-07 0Molybdenum 0.02 6E-03 0Nitrate/nitrite (MCL) b 0.04 0.009 0Selenium IV 2E-09 2E-15 0Selenium VI 0.03 0.01 0Thallium 0.2 0.07 0abValues are HQs for all chemicals except arsenic; arsenic values are cancer risk. Zero resultsindicate that contaminant infiltration rates were too small for the contaminant plume to reachthe receptor during the 10,000 year period of the analysis.Values are ratios of exposure concentration to MCL.Table 4-3. 90th Percentile Risk Results by CCW Type: SurfaceImpoundments, Groundwater-to-Drinking-Water PathwayChemical90th Percentile HQ or Cancer Risk Value aUnlined UnitsConventional CCW – 44 surface impoundmentsCancerClay-Lined UnitsComposite-LinedUnitsArsenic III 2E-03 9E-04 2E-07Arsenic V 7E-04 2E-04 0NoncancerAluminum 2E-03 1E-03 2E-07Barium 5E-03 3E-03 2E-11Boron 7 4 5E-03Cadmium 0.5 0.3 4E-11Cobalt 0.9 0.4 0Lead (MCL) b 3 0.7 1E-21Molybdenum 8 5 7E-03Nitrate/nitrite (MCL) b 20 10 9E-04Selenium IV 0.4 0.1 1E-04(continued)April 2010–Draft EPA document. 4-6
Section 4.0Risk Characterization90th Percentile Risk Results by CCW Type: SurfaceImpoundments, Groundwater-to-Drinking-Water Pathway (continued)Chemical90th Percentile HQ or Cancer Risk Value aUnlined UnitsClay-Lined UnitsComposite-LinedUnitsSelenium VI 2 1 1E-03Codisposed CCW and Coal Refuse – 72 surface impoundmentsCancerArsenic III 2E-02 7E-03 4E-06Arsenic V 2E-02 2E-03 3E-09NoncancerAluminum 0.3 0.07 6E-07Barium 7E-03 3E-03 9E-07Boron 1 0.5 2E-03Cadmium 9 3 5E-05Cobalt 500 200 3E-06Lead (MCL) b 9 1 1E-19Molybdenum 3 2 4E-03Nitrate/nitrite (MCL) b 0.4 0.2 1E-04Selenium IV 0.3 0.1 3E-10Selenium VI 0.8 0.4 1E-03abValues are HQs for all chemicals except arsenic; arsenic values are cancer risk. Zero resultsindicate that contaminant infiltration rates were too small for the contaminant plume to reachthe receptor during the 10,000 year period of the analysis.Values are ratios of exposure concentration to MCL.Table 4-4. 50th Percentile Risk Results by CCW Type: SurfaceImpoundments, Groundwater-to-Drinking-Water PathwayChemical50th Percentile HQ or Cancer Risk Value aUnlined UnitsConventional CCW – 44 surface impoundmentsCancerClay-Lined UnitsComposite–LinedUnitsArsenic III 1E-04 6E-05 0Arsenic V 2E-05 4E-06 0NoncancerAluminum 2E-05 1E-05 8E-20Barium 1E-04 1E-04 0Boron 0.4 0.2 3E-11Cadmium 0.05 0.02 0Cobalt 0.2 0.05 0(continued)April 2010–Draft EPA document. 4-7
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This draft document has been prepar
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CCWTable of ContentsTable of Conten
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CCWTable of ContentsList of Figures
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CCWTable of Contents4-22. Summary o
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CCWList of AcronymsAcronymDefinitio
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CCWList of AcronymsApril 2010-Draft
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Executive SummaryHuman and Ecologic
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Section 1.0Introduction1.0 Introduc
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Section 1.0Introduction1.3.2 Exposu
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Section 1.0IntroductionThis methodo
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Section 1.0Introduction1.4 Document
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Section 2.0Problem Formulationdata
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Section 2.0Problem FormulationTable
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Section 2.0Problem Formulationsmall
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Section 2.0Problem FormulationFigur
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Section 2.0Problem Formulationonsit
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Section 2.0Problem Formulation2.3 S
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Section 2.0Problem Formulationand C
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Section 2.0Problem Formulationof dr
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Section 4.0Risk CharacterizationEco
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Section 4.0Risk Characterization•
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Section 4.0Risk Characterization•
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Section 5.0ReferencesFinkelman, R.B
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Section 5.0ReferencesU.S. EPA (Envi
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Section 5.0Referenceshttp://www.epa
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Section 5.0ReferencesDisposal of Co
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Appendix AConstituent DataA.1 Data
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Appendix AConstituent DataA.2.1 Sel
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Appendix AConstituent Data2. Select
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Appendix AAttachment A-1: Sources o
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April 2010-Draft EPA document.[This
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Appendix AAttachment A-2: CCW Const
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Appendix A Attachment A-3Table A-3-
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Appendix A Attachment A-3Cr IIIHgAg
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Appendix A Attachment A-3NO3CNCd, C
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Appendix BWaste Management UnitsWas
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Appendix BWaste Management Units•
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Appendix BWaste Management Units(e.
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Log(capacity, cubic yards)Log(area,
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Appendix BWaste Management UnitsB.7
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Appendix BAttachment B-1: CCW Dispo
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Appendix BAttachment B-1: CCW Dispo
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Appendix BAttachment B-2: CCW WMU D
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Appendix CSite DataWMU and the wate
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Appendix CSite DataFigure C-1. Exam
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Appendix CSite Dataeach site, eithe
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Appendix CSite DataBecause EPACMTP
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Appendix CSite DataHydrogeologic Se
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Appendix CSite DataFigure C-2. EPAC
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Appendix CSite DataEPACMTP Climate
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Appendix CSite DataRF1 Reach Types
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Appendix CSite DataTable C-9. Regio
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Appendix CSite DataHydrologicRegion
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Appendix CSite DataClawges, R.M., a
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Appendix CAttachment C-1: Soil Data
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Appendix CAttachment C-2: Hydrogeol
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Appendix CAttachment C-3: Climate C
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Appendix CAttachment C-4: Waterbody
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Appendix DMINTEQA2 Nonlinear Sorpti
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Appendix EEquationsIf Cwctot > Csol
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Appendix EAttachment E-1: Surface W
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Appendix EAttachment E-2: Fish Conc
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Appendix EAttachment E-3: Intake Ra
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Appendix FHuman Exposure Factorswer
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Appendix FHuman Exposure FactorsBec
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Appendix FHuman Exposure FactorsF.1
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Appendix GHuman Health BenchmarksG.
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Appendix GHuman Health BenchmarksHu
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Appendix GHuman Health BenchmarksU.
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Appendix HEcological BenchmarksRisk
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Appendix HEcological BenchmarksH.1.
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Appendix HEcological BenchmarksCons
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Appendix HEcological BenchmarksU.S.
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Appendix ICalculation of Health-Bas
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Appendix JChemical-Specific Inputs
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Appendix JChemical-Specific Inputs
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Appendix KScreening Analysis Result
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Appendix LTime to Peak Concentratio
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