Human and Ecological Risk Assessment - Earthjustice

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Section 2.0Problem Formulationused as the basis for a national-scale site-based Monte Carlo assessment of risks posed by theonsite disposal of CCW at utility power plants across the United States. Figure 2-1 maps theCCW disposal sites modeled in this analysis against long-term average precipitation levels forthe country.Figure 2-1. Coal combustion plants with onsite waste disposal modeledin CCW risk assessment.2.2.1 Conceptual Site ModelFigure 2-2 depicts the conceptual site model for CCW disposal that was the basis for thenational CCW risk assessment, including contaminant sources, exposure pathways, andreceptors. The CCW conceptual site model includes the following exposure pathways:Human Health:• Groundwater to drinking water (drinking water ingestion)• Groundwater to surface water (fish consumption)Ecological Risk:• Groundwater to surface water and subsequent direct contact with contaminated surfacewater and sediments• Groundwater to surface water and subsequent ingestion of contaminated aquatic fooditems.April 2010–Draft EPA document. 2-7
Section 2.0Problem FormulationFigure 2-2. Conceptual site model of CCW risk assessment.April 2010–Draft EPA document. 2-8
Page 2 and 3: This draft document has been prepar
Page 5 and 6: CCWTable of ContentsTable of Conten
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Page 9 and 10: CCWTable of Contents4-22. Summary o
Page 11 and 12: CCWList of AcronymsAcronymDefinitio
Page 13 and 14: CCWList of AcronymsApril 2010-Draft
Page 15 and 16: Executive SummaryHuman and Ecologic
Page 25 and 26: Section 1.0Introduction1.0 Introduc
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Section 4.0Risk Characterization4.0
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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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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 CAttachment C-1: Soil Data
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Appendix CAttachment C-3: Climate C
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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 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 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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