ESM 223Lecture 3 –Local and Basin-wide Water Quality ConditionsWinter 2008, Norm BrownTHE BREN SCHOOL OF ENVIRONMENTAL SCIENCE AND MANAGEMENTat the University of California, Santa Barbara PresentsMichael HanrahanCEO, 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 inBringing about Change in Environmental Perceptions and Actions...and Fast" Hosted by Dave Panitz and Bren Associate Professor Hunter LenihanFYI: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, … )4Risk-Based Action
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5Risk 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 population6Risk 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?7Risk 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 objectivesRisk Assessment