esm223_03_Lecture_Notes_fullsize

esm223_03_Lecture_Notes_fullsize - Winter 2008, Norm Brown...

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ESM 223 Lecture 3 – Local and Basin-wide Water Quality Conditions Winter 2008, Norm Brown
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THE BREN SCHOOL OF ENVIRONMENTAL SCIENCE AND MANAGEMENT at the University of California, Santa Barbara Presents Michael Hanrahan CEO, Co-founder The Ocean Channel Tuesday, Jan. 15, 2008 12:30 - 1:30 p.m. Bren Hall 1424 "Communicating the Urgency: The Instrumental Role of Media in Bringing about Change in Environmental Perceptions and Actions. ..and Fast" Hosted by Dave Panitz and Bren Associate Professor Hunter Lenihan FYI:
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Overview • Introduction to Risk-Based Action and Risk Assessment – Overview of RA Elements • Example Classes in Basin Water Quality Issues – Arsenic – Agricultural Dicharges • Introduction to other major contaminant classes (chlorinated hyrdocarbons, fuels & MTBE, … )
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4 Risk-Based Action
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5 Risk Assessment • Systematic process for: – generating estimates of all significant risk factors – range of exposure scenarios – release of pollutants into any compartment in environment – for specific receptors or general population
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6 Risk Assessment • Answer to these questions: – What could potentially go wrong? – What are the chances that it will happen? – What are the anticipated consequences if this should happen? – Who are the potential receptors? – How likely is it that they will be adversely affected? – Is this probability acceptable? • Also useful in determining: – How safe is safe enough? – How clean is clean enough?
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7 Risk Assessment • Objectives: – Provide sufficient information to decision makers to make decisions concerning a potentially hazardous condition – Rational allocation of resources to increase safety and/or reduce the risk of exposure to pollutants and the effects on human and environmental health – Determine for a particular site what is the appropriate course of action: monitoring, containment or remediation – Provide guidelines for clean-up levels that are cost- effective and within certain risk objectives
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Risk Assessment
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Risk Assessment • Steps in Risk Assessment Process – Toxicity Assessment (Dose-Response) – Exposure Assessment (Fate and Transport to determine exposure pathways and concentrations) – Risk Characterization
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10 Toxicity Assessment (more on this next lecture) • Objective: quantitatively determine the potential for adverse health effects as a result of exposure to the contaminants – Hazard assessment: determine if exposure causes an increase in the incidence of an adverse health effect (e.g. cancer, birth defects) – Dose-response assessment: quantitative evaluation of toxicity and characterization of the dose-response relationship
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Two Contaminant Classes for Study •A r s e n i c • Agricultural Discharges
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Arsenic • Distribution • Health Impacts and Water Quality Standards • Treatment and Blending Options • Special Impacts to small water supply agencies • cf PHG and MCL differences regarding economic factors
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esm223_03_Lecture_Notes_fullsize - Winter 2008, Norm Brown...

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