Evaluating Exposure in Proposition 65 Claims

Attorneys handling Proposition 65 cases need to understand how potential exposures to listed chemicals are evaluated for products, facility air emissions and discharges to water to assess warning requirements.  Based on their experience with more than 20 Proposition 65 exposure evaluations, risk assessment scientists will describe the exposure assessment process and provide case study examples of product and facility air emissions and water discharge evaluations.

1. Introduction to Exposure Assessment
   1. Relationship of exposure to risk
   2. Assessing exposure
   3. Calculating dose
   4. Proposition 65 nuances
   5. The ìreasonably anticipated rate of exposureî
   6. ìNo Significant Risk Levelsî for carcinogens and ìAcceptable Intake Levelsî for reproductive toxins
2. Assessing Potential Exposures to Chemicals from Products
   1. Understanding how exposures might occur; reasonable scenarios
   2. Collecting data to support the exposure assessment; published data and applied research
   3. Case Study: Assessing exposure to a new household insecticide
3. Assessing Potential Exposures to Facility Air Emissions
   1. Worker and adjacent community exposure scenarios
   2. Data needs; representative air concentrations and receptor activity patterns
   3. The use of emission and transport models to estimate airborne chemical concentrations
   4. Case Study: Lead and chromium emissions from a manufacturing facility
4. Assessing Potential Exposures to Discharges to Drinking Water
   1. Establishing exposure scenarios and the point of exposure
   2. Using discharge data; most will come from other required regulatory programs
   3. Estimating concentrations in water that could be extracted for drinking
   4. Answering water supply questions
   5. Case Study: Assessing exposure from facility groundwater and storm water discharges to a river estuary