Human and Ecological Risk Assessment - Earthjustice

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Section 4.0Risk CharacterizationTable 4-22. Summary of 50th Percentile Full-Scale CCW Ecological Risk Results:Groundwater-to-Surface-Water Pathway, Aquatic Receptors aChemicalLandfillsUnlined Units50th Percentile Ecological HQClay-LinedUnitsComposite-Lined UnitsExposurePathwayReceptorBoron 0.2 0.1 0 direct contact aquatic biotaLead 7E-05 4E-08 0 ingestion river otterSelenium (VI) 0.002 0.001 0 direct contact aquatic biotaArsenic (V) 4E-06 5E-09 0 direct contact aquatic biotaBarium 1E-10 4E-12 0 direct contact aquatic biotaCadmium 2E-04 9E-05 0 direct contact aquatic biotaAluminum 3E-07 8E-09 0 direct contact aquatic biotaSurface ImpoundmentsBoron 7 0.4 5E-05 direct contact aquatic biotaLead 0.05 0.0008 0 ingestion river otterArsenic (V) 0.03 0.0007 0 direct contact aquatic biotaSelenium (VI) 0.03 0.002 4E-07 direct contact aquatic biotaCobalt 0.01 0.001 0 direct contact aquatic biotaBarium 0.006 0.0004 0 direct contact aquatic biotaCadmium 0.008 0.0003 0 direct contact aquatic biotaAluminum 0.0007 4E-05 4E-11 direct contact aquatic biotaaZero results indicate that contaminant infiltration rates were too small for the contaminant plume toreach the receptor during the 10,000 year period of the analysis.4.2.3 Sediment Receptors (Full-Scale Analysis)Tables 4-23 and 4-24 present the 90th and 50th percentile results of the ground-water-tosurface-waterpathway for sediment receptors for landfills and surface impoundments. Forunlined landfills, lead (HQ of 58), arsenic (HQ of 11), cadmium (HQ of 5), and antimony (HQ of2) show 90th percentile risks above the ecological risk criterion. For clay lined landfills, onlyarsenic (HQ of 3) has an ecological HQ greater than 1. For surface impoundments, lead, arsenic,and cadmium showed 90th percentile HQs above 1 for unlined, clay-lined, and composite-linedunits (with HQs ranging from 2 to 311). Although cadmium was not above the risk criterion insurface water, it did have an HQ of 30 in sediments at the 90th percentile for unlined surfaceimpoundments and HQs of 9 and 2 for clay- and composite-lined impoundments respectively.None of the constituents modeled showed sediment risks at or above an HQ of 1 at the 50thpercentile.April 2010–Draft EPA document. 4-30
Section 4.0Risk CharacterizationTable 4-23. Summary of 90th Percentile Full-Scale CCW Ecological Risk Results:Groundwater-to-Surface-Water Pathway, Sediment Receptors aChemicalLandfillsUnlined Units90th Percentile Ecological HQClay-LinedUnitsComposite-Lined UnitsExposurePathwayReceptorLead 58 1 1E-06 direct contact aquatic biotaArsenic (III) 11 3 5E-04 ingestion river otterCadmium 5 1 6E-05 direct contact aquatic biotaAntimony 2 0.5 7E-05 direct contact aquatic biotaMolybdenum 0.1 0.03 2E-05 direct contact aquatic biotaBarium 0.006 6e-04 0 direct contact aquatic biotaSurface ImpoundmentsLead 311 58 4 direct contact aquatic biotaArsenic (III) 127 55 31 ingestion river otterCadmium 30 9 2 direct contact aquatic biotaMolybdenum 0.9 0.3 0.1 direct contact aquatic biotaBarium 0.008 0.004 0.002 direct contact aquatic biotaaZero results indicate that contaminant infiltration rates were too small for the contaminant plume toreach the receptor during the 10,000 year period of the analysis.Table 4-24. Summary of 50th Percentile Full-Scale CCW Ecological Risk Results:Groundwater-to-Surface-Water Pathway, Sediment Receptors aChemicalLandfillsUnlined Units50th Percentile Ecological HQClay-LinedUnitsComposite-Lined UnitsExposurePathwayReceptorLead 6E-05 9E-08 0 ingestion spotted sandpiperArsenic (III) 4E-03 0.002 0 ingestion spotted sandpiperCadmium 5E-04 2E-04 0 direct contact sediment biotaAntimony 3E-04 1E-04 0 direct contact sediment biotaMolybdenum 5E-05 3E-05 0 ingestion spotted sandpiperBarium 3E-13 8E-15 0 ingestion spotted sandpiperSurface ImpoundmentsLead 0.1 0.001 0 ingestion spotted sandpiperArsenic (III) 0.4 0.02 4E-09 ingestion spotted sandpiperCadmium 0.02 0.0007 0 direct contact sediment biotaMolybdenum 0.004 0.0002 2E-08 ingestion spotted sandpiperBarium 1E-05 1E-06 0 ingestion spotted sandpiperaZero results indicate that contaminant infiltration rates were too small for the contaminant plume toreach the receptor during the 10,000 year period of the analysis.April 2010–Draft EPA document. 4-31
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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 3.0Analysisscale analysis.
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Section 3.0Analysis• The RfD is a
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Section 3.0Analysis3.1.2 Ecological
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Section 3.0AnalysisEcological Risk
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Section 3.0Analysisfor the screenin
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Section 3.0AnalysisTable 3-5. Scree
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Section 3.0Analysisapproximately 30
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Section 3.0Analysisthose input file
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Section 3.0AnalysisCCW Waste TypesC
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Section 3.0Analysis• An in-depth
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Section 3.0Analysisused to determin
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Section 3.0Analysisconsolidation. A
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Page 157 and 158: Section 5.0ReferencesFinkelman, R.B
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Page 163 and 164: Section 5.0ReferencesDisposal of Co
Page 165 and 166: Appendix AConstituent DataA.1 Data
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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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Human and Ecological Risk Assessment - Earthjustice

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