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EVALUATION OF APPENDIX IX COMPOUNDS
(Excluding PCBs and Dioxins/Furans)
DIRECT CONTACT HUMANHEALTH RISK ASSESSMENT
EVALUATION OF APPENDIX IX COMPOUNDS
(Excluding PCBs and Dioxins/Furans)
DIRECT CONTACT HUMAN HEALTH RISK ASSESSMENT
PresePresenntatationtion BB yy:: MMaargrgaret McDoaret McDononouugghh
U.S.U.S. EPAEPA –– RRegiegion Ion I
Draft Confidential Housatonic River Project
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ObjectivesObjectives °° EvEvaluate Contaminaluate Contaminants ofants of PotenPoten ttialial CoConcernncern
(COPCs)(COPCs) -- ExclExcludiudingng PCPC Bs and DBs and Diiooxixins/Furns/Furansans
°° Determine need forDetermine need for additionaladditional samplingsampling
°° Determine risk aDetermine risk asssessment approachsessment approach
Draft Confidential Housatonic River Project pg 2
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Contaminants of Potential Concern
Contaminants of Potential Concern
°° Generic Risk Based Screening:Generic Risk Based Screening: °° CompareCompare site consite conccentrations toentrations to
RegionRegion 9 Preliminary9 Preliminary ReRe mediation Goals (mediation Goals (PPRGs)RGs)
Draft Confidential Housatonic River Project pg 3
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Additional SamplingAdditional Sampling
Determine need bDetermine need byy:: -- ComparingComparing site consite conccentraentrations to Background:tions to Background:
-- Site-speciSite-speciff iicc - MADEP- MADEP
- Considering risk ba- Considering risk basedsed screeningscreening
Draft Confidential Housatonic River Project pg 4
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Preliminary RemediationGoals
Preliminary RemediationGoals
°° Region 9 ValuesRegion 9 Values
°° Residential SoilResidential Soil ValuesValues
°° Target Risk = 1E-06Target Risk = 1E-06
°° Target Hazard Quotient = 0.1Target Hazard Quotient = 0.1
Draft Confidential Housatonic River Project pg 5
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Soil Data SetSoil Data Set °° 110 samples bet110 samples betwween the confluence andeen the confluence and
Woods PondWoods Pond
°° Floodplain and RFloodplain and Riiverbankverbank
°° 0-1 foot depths0-1 foot depths
Draft Confidential Housatonic River Project pg 6
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COPC EliminationCOPC Elimination °° Elimination CrElimination Criteriteria:ia:
- Objective:- Objective: ax mum D•• MMaxiimum Deetecttected Ced Cooncentrncentraatition <on < PRPR GG
- Subjectiv- Subjectivee Freq•• Frequencyuency of Dof D eetectitectioon andn and FrFr eqequencyuency//DDeeggrree oee off ExExceedanceceedance
Draft Confidential Housatonic River Project pg 7
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Subjective Criteria ExamplesSubjective Criteria Examples °° Benzo(k)fluorantheneBenzo(k)fluoranthene
-- Exceeded PRG inExceeded PRG in 1/1061/106 samplessamples -- Max mum ratio = 2.3Maxiimum ratio = 2.3
°° CCyyanideanide -- FrequencFrequencyy of Deof De tect =tect = 3/983/98 samplessamples -- Max mum ratio = 3.3Maxiimum ratio = 3.3
Draft Confidential Housatonic River Project pg 8
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Chemicals Not Eliminated in PRG Comparison - Soil
Chemicals Not Eliminated in PRG Comparison - Soil
- Benzo(a)anthracen °° PAHsPAHs
- Benzo(a)anthracenee -- Benzo(a)pyBenzo(a)pyrenerene -- Benzo(b)fluorantheBenzo(b)fluoranthenene -- Dibenzo(a,h)anthraceneDibenzo(a,h)anthracene -- Indeno(1,2,3-Indeno(1,2,3-cd)pycd)pyrreneene
°° MetalsMetals -- ArsenicArsenic -- ThalliumThallium
Draft Confidential Housatonic River Project pg 9
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Soil BackgroundSoil Background Site-specific
Chemical Background Mean (mg/kg)
MADEP Background (mg/kg)
PAHs Benzo(a)anthracene 1.77E-01 5E-01
Benzo(a)pyrene 1.97E-01 5E-01
Benzo(b)fluoranthene 1.86E-01 5E-01
Dibenzo(a,h)anthracene 2.60E-01 5E-01
Indeno(1,2,3-cd)pyrene 1.79E-01 5E-01
Metals
Arsenic 4.86E+00 1.7E+01
Thallium 1.31E+00 6E-01
Draft Confidential Housatonic River Project pg 10
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Background Comparison Results - Soil
Background Comparison Results - Soil
°° Chemicals considered higher thanChemicals considered higher than background:background: °° PAHsPAHs
-- BenzBenzo(o(a)a)anthranthracenacenee -- BenzBenzo(o(a)a)pypyrreneene - Benz- Benzo(o(b)b)ff lluoruorananthethennee
-- DDiibenzbenzo(o(a,h)a,h)anthranthracenacenee
-- IndenIndeno(o(1,21,2,,3-3-cd)cd)ppyyrreneene
Draft Confidential Housatonic River Project pg 11
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Site-specific screeningSite-specific screening °° Develop Site-Specific RBCsDevelop Site-Specific RBCs
-- High-contact reHigh-contact recreacreational extional exposureposure assumassumpptiontionss
-- Target Risk =Target Risk = 5E-05E-0 66
-- Target HazardTarget Hazard Quotient = 1Quotient = 1..00
Draft Confidential Housatonic River Project pg 12
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Site-Specific RBCs - SoilSite-Specific RBCs - Soil
Chemical Site-Specific RBC (mg/kg) PAHs
Benzo(a)anthracene 1.4E+01
Benzo(a)pyrene 1.4E+00
Benzo(b)fluoranthene 1.4E+00
Dibenzo(a,h)anthracene 1.4E+01
Indeno(1,2,3-cd)pyrene 1.4E+01
Draft Confidential Housatonic River Project pg 13
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Site-Specific RBC Comparison
Site-Specific RBC Comparison
Frequency Ratio of Maximum Chemical Exceeding RBC Detected
Concentration to RBC PAHs
Benzo(a)anthracene 0 / 94 --
Benzo(a)pyrene 6 / 94 7.9
Benzo(b)fluoranthene 0 / 94 --Dibenzo(a,h)anthracene 0 / 94 --Indeno(1,2,3-cd)pyrene 0 / 94 --
Draft Confidential Housatonic River Project pg 14
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Site-Specific RBC ExceedancesSite-Specific RBC Exceedances
•• Locations of B(a)Locations of B(a)P exceedances:P exceedances: “Paintball”–– “Paintball” area (2)area (2)
–– arcelPParcel 29-2 29-2 (1)(1) –– arcelPParcel 29-3 29-3 (2)(2)
Draft Confidential Housatonic River Project pg 15
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Sediment Data SetSediment Data Set °° 61 samples61 samples
°° River channel, SRiver channel, SCCOXs, Woods PondOXs, Woods Pond
°° 0-0.5 foot depths0-0.5 foot depths
Draft Confidential Housatonic River Project pg 16
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Chemicals Not Eliminated in PRG Comparison - SedimentChemicals Not Eliminated in PRG Comparison - Sediment
°° PAHsPAHs -- BenzBenzo(o(a)a)anthranthracenacenee - Benz- Benzo(o(a)a)pypyrreneene - Benz- Benzo(o(b)b)ff lluoruorananthethennee -- DDiibenzbenzo(o(a,h)a,h)anthranthracenacenee -- IndenIndeno(o(1,21,2,,3-3-cd)cd)ppyyrreneene -- PhenaPhenanthrnthreennee
- Arseni °° MetMetaalsls
- Arsenicc -- CCadmiadmiuumm -- haTThalliulliumm
Draft Confidential Housatonic River Project pg 17
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Sediment BackgroundSediment Background Site-specific
Chemical Background Mean (mg/kg)
MADEP Background (mg/kg)
PAHs Benzo(a)anthracene 3.97E-01 5E-01
Benzo(a)pyrene 3.85E-01 5E-01
Benzo(b)fluoranthene 3.95E-01 5E-01
Dibenzo(a,h)anthracene 3.43E-01 5E-01
Indeno (1,2,3-cd)pyrene 3.44E-01 5E-01
Phenanthrene 3.94E-01 5E-01
Metals
Arsenic 2.66E+00 1.7E+01
Cadmium 4.81E-01 2E+00
Thallium 1.08E+00 6E-01 Draft Confidential Housatonic River Project pg 18
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Background Comparison Results – Sediment
Background Comparison Results – Sediment
°° Chemicals considered higher thanChemicals considered higher than background:background: °° PAHsPAHs
-- BenzBenzo(o(a)a)anthranthracenacenee -- BenzBenzo(o(a)a)pypyrreneene -- BenzBenzo(o(b)b)ff lluoruorananthethennee -- DDiibenzbenzo(o(a,h)a,h)anthranthracenacenee -- IndenIndeno(o(1,21,2,,3-3-cd)cd)ppyyrreneene -- PhenaPhenanthrnthreennee
Draft Confidential Housatonic River Project pg 19
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Sediment Secondary ApproachSediment Secondary Approach
Draft Confidential Housatonic River Project pg 20
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Site-Specific RBCs -Sediment
Site-Specific RBCs -Sediment
Chemical Site-Specific RBC (mg/kg) PAHs
Benzo(a)anthracene 8E+00
Benzo(a)pyrene 8E-01
Benzo(b)fluoranthene 8E+00
Dibenzo(a,h)anthracene 8E-01
Indeno(1,2,3-cd)pyrene 8E+00
Phenanthrene 7.2E+03
Draft Confidential Housatonic River Project pg 21
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Site-Specific RBC Comparison - Sediment
Site-Specific RBC Comparison - Sediment
Frequency Chemical Exceeding RBC
PAHs
Benzo(a)anthracene 4/58
Benzo(a)pyrene 9/57
Benzo(b)fluoranthene 2/58
Dibenzo(a,h)anthracene 6/56
Indeno(1,2,3-cd)pyrene 0/57
Phenanthrene 0/57 Draft Confidential Housatonic River Project pg 22
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ConclusionsConclusions °° Additional saAdditional sampling for Appendix IXmpling for Appendix IX
compounds (excluding PCBs andcompounds (excluding PCBs and dioxins/furans) is not necessarydioxins/furans) is not necessary
°° Appendix IX compoundsAppendix IX compounds (excludin(excludingg PCBsPCBs and dioxins/furans) eliminated froand dioxins/furans) eliminated fromm site-site-specific evaluatiospecific evaluationn
Draft Confidential Housatonic River Project pg 23
