Welcome to the 2012 RPIc FedeRal contamInated SIteS natIonal ...
Human Health Risk Assessment at Federal Contaminated Sites
Transcript of Human Health Risk Assessment at Federal Contaminated Sites
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Human Health Risk Assessmentat Northern Mines
Contaminated Sites Division
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Federal Contaminated Sites Action Plan
• $3.5 billion, 15-year program established in 2005• Reduce risks to human health and the
environment• Reduce federal financial liabilities
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Faro MineRose Creek Tailings Area
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Health Canada’s FCSAP Mandate
• Health Canada is an Expert Support Department
• Guidance, training and advice on human health riskassessment and public involvement
• Peer review of human health risk assessments• Rank sites for human health risks• Fulfill Health Canada's obligations under CEAA as it pertains to
the remediation of Contaminated Sites
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Why is Risk Assessment Useful?
• Generic guidelines (AL, RL, PL, IL, CL) not consistent withlanduse at northern abandoned and orphaned mines
• Guidelines are developed using risk assessmentmethodology for a “generic” site
• Site specific considerations• Traditional landuse
• hunting, camping, berry picking, downstream fishing• Frequency at the site• Bioavailability of substances in soils
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Brown-McDade Pit
• Mount Nansen, Yukon
• Gold and silver mine
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• Port Radium, Echo Bay, NWT• E shore of Great Bear Lake• remote• Mining and milling: radium, uranium and silver ores
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What Do We Need To Know?• Who goes to the site?
• Where do they go on site?
• What do they do there?
• How much time do theyspend there?
• What foods are consumedfrom the site – how muchand for how long?
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Are All Issues Considered?
GroundwaterVapour
SoilVapour
Inhalation ofVapour and Dust
• Ingestion ofPlants
• Ingestion/DermalContact with Soil
Ingestion ofWater
Ingestion ofCountry Foods
VAPOURMIGRATIONPATHWAYS
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Moose walking through tailings
• Faro Mine, Yukon• Lead/zinc mine
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Health Canada Risk Assessment GuidanceHealth Canada. 2004. Federal Contaminated Site Risk Assessment in Canada:
• Part I: Preliminary Quantitative Risk Assessment (PQRA)• Part II: Toxicological Reference Values• Part III: Peer Review Checklist• Part IV: Excel Spreadsheet Tool for PQRA (2008)• Addressing Psychosocial Factors Through Capacity Building: A Guide for
Managers of Contaminated Sites (2005)• Improving Stakeholder Relationships: Public Involvement and the Federal
Contaminated Sites Action Plan: A Guide for Site Managers (2006)
Anticipated 2009:• Updated PQRA guidance• Detailed Quantitative Risk Assessment (DQRA)• Vapour Intrusion Guidance• Environmental Site Assessment• Country Foods Assessment• Development of Statement of Work for HHRA
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Why Standardize Risk Assessment? Ranking
CMHC, 1997
Differ by factor of 100,000,000
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Why Involve Expert Support?• Technical review of assumptions
and calculations• Would a toddler accompany a
family on a 3-month trip?• Are foods only consumed while
at the site or through the year?• Are buildings used for shelter?• Are there significant data gaps?
• COPCs• Media sampled
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Does the Math Make Sense?
“Soyousee,yourHonour,giventhatthiswasthefirst5methatIdrankallyear,the12drinksthatIconsumedonthenightofSeptember29wereactuallyequivalenttoabout0.033drinksperdaywhenamor5zedevenlyovertheen5reyear.Asaresult,IcouldnothavebeenimpairedandtheDUIchargeshouldbethrownout.”
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Public Involvement• When and how should the community be involved?
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Review Challenges
• Remote, large areas• Paucity of information• Many areas impacted, multi-media affected