1. Jane Houlihan Sean Gray Richard Wiles Children’s exposure to arsenic-treated wood A preliminary Monte Carlo risk assessment Presentation to EPA’s Science Advisory Panel October 23, 2001

2. Monte Carlo method of risk analysis

3. Arsenic that rubs off onto hands from contact with arsenic-treated wood

4. Dislodgeable arsenic on the surface of arsenic-treated wood

5. Stilwell and Gorny 1997, 7 Connecticut decks, sandy loam Townsend and Solo-Gabriele 2001, 9 Florida structures, sand Osmose, Florida research plot data Wood industry (SCS 1998) 10 prefabricated Virginia decks Arsenic levels in soil beneath arsenic-treated wood

6. Soil ingestion

7. Body Weight: 1 st to 99 th percentiles

8. Surface area calculated from body weight

9. Dermal absorption: Regression analysis of body part area percentages

10. Differences in exposure parameters

11. Excess lifetime cancer risk to children exposed to arsenic-treated wood

12. Comparison between EPA and wood industry exposure assumptions

13. Model sensitivity to assumed dislodgable arsenic transfer rates

14. Excess lifetime cancer risk to children exposed to arsenic-treated wood