1. History of Research Project on CCA-Treated Wood Presented May 6, 2002 Gainesville, Florida

2. Funding Received from Florida Center for Solid and Hazardous Waste Mngt. Florida Power and Light Sarasota County Florida Department of Environmental Protection Florida International University/National Institute for Environmental Health Science

3. Helena Solo-Gabriele, Ph.D., P.E., Assoc. Prof., Civil/Environ. Engrg Timothy Townsend, Ph.D. Assoc. Prof., Environ/Solid Waste Engrg Yong Cai, Ph.D. Assist. Prof., Chemistry Active Faculty Researchers

4. Students Supported on Project  Sean Bennie  Kenneth Brown  Vandin Calitu  Brajesh Dubey  Tim Franklin  Kelvin Gary  Myron Georgiadis  Naila Hosein  Kendiro Iida  Gary Jacobi  Jenna Jambeck  Bernine Khan  Monika Kormienko  Brian Messick  Tom Moskal  Jennifer Penha  Donna May Sakura  Catalina Santamaria  Ajay Seth  Jin-Kun Song  Kristin Stook  Thabet Tolaymat  Lakmini Wadanambi

5. Background  CCA-Treated Wood is the most common wood preservative used today (>80% market)  CCA ---> Chromated Copper Arsenate

6. Background Above Ground Structural Poles Saltwater Splash Saltwater Immersion Pole/Pilings pcf = pounds of CCA per cubic foot of wood 20,000 mg/kg As 2,000 mg/kg As

7. Background  CCA ---> Chromated Copper Arsenate The treated wood contains very high concentrations of Cr, Cu, and As  As toxic, known carcinogen  Soil background levels for arsenic in Florida are low  Strict disposal guidelines

8. Why Was this Project Initiated?  High metals concentrations were observed in the ash from wood cogeneration facilities located in Florida

9. Year 1 (1996-1997)

10. Year 1: Disposal Forecast

11. C&D Landfill MSW Landfill C&D Debris Recycling Facilities CCA-Wood Removed from Service Processed Wood (6% CCA in 1996) Land Application Wood Fuel Facility Ash

12. Year 2 (1997-1998)

13. Year 2 Develop Tools for Disposal End Management  Leaching Studies, ash  Hazardous when CCA-treated wood represents 5% of wood burned  Solvents can extract metals from ash, citric acid very promising (40 to 100% As removed) ------> Explore Potential Recycling?

14. Year 2 (continued)  Sorting Studies, Laboratory  Chemical stains, low capital cost labor intensive  X-ray methods, high capital cost suitable for on-line system UntreatedTreated

15. Year 3 (1998-1999)

16. Year 3  Disposal-End Management  Field Demonstration of Sorting Technologies Stains suitable for sorting small quantities of wood  Evaluation of Pyrolysis Technology Appears promising for ultimate disposal  Resource book for Wood Disposal Sector

17. Year 3 (Continued)  Alternative Chemicals  Four Promising Alternative Chemicals for CCA: ACQ, CBA, CC, CDDC  All standardized for applications requiring 0.25 & 0.4 pcf Comparable to CCA: efficacy  Leach less As but generally more Cu  Cost 10 to 30% more at retail establishment

18. Ash Problem Inventory Sorting Lab Ash Char & Trt Sorting Field Alt. Chem. Lit Review Year 1 Year 2 Year 3

19. The Research Team Was Invited to the Minnesota Proceedings  Minnesota’s Listed Metals Advisory Council [Cd, Pb, Hg, and Cr(VI)]  Speciation Debated  In-Service Issues Debated  Lack of Scientific Data

20. Year 3 Supplemental  Impacts of CCA on Soil during In-Service Use  Use Sectors for CCA-Treated Wood  Leaching of CCA-treated Wood and C&D Debris Wood Mulch  Literature Reviews, Alt. Chem. Cr & As Speciation Minnesota Lit Reviews Alt Chem, As, Cr Spec Deck Study Leaching Wood & Mulch Use Sectors

21. Leaching of CCA During In- Service Use Year 3 Supplemental

22. Leaching of CCA-Treated Wood During In-Service Use Year 3 Supplemental

23. Chemicals Do Leach from CCA-treated Wood During In-Service Use Leaching of CCA-Treated Wood During In-Service Use Not CCA-Treated FDEP Industrial SCTL

24. Leaching of CCA-Treated Wood During In-Service Use Approximately 39 square miles of Florida land covered by CCA-treated decks. Top 8 inches of this area would correspond to 60 million tons of soil.

25. Use Sectors for CCA-Treated Wood Year 3 Supplemental

26. Use Sectors for CCA-Treated Wood Year 3 Supplemental

27. 28,600 tons of As, Cumulative  1600 tons As imported per year In-service losses (10%): 2900 tons Disposed to date: 1600 tons Future disposal (for that imported through 2000): 24,100 tons Year 3 Supplemental

28. Leaching of CCA-treated Wood and C&D Debris Wood Mulch Year 3 Supplemental

29. Leaching of CCA-Treated Wood TCLP Limit

31. Leaching of Mulch SamplesNo.No. Exceeding GWCTL for As No. Exceeding GWCTL for Cr C&D Debris20185 Yard Waste311 Colored Mulch 320 Vegetative Mulch 300 Year 3 Supplemental

32. Ash Problem Inventory Sorting Lab Ash Char & Trt Sorting Field Alt. Chem. Lit Review Minnesota Lit Review Alt Chem, As, Cr Spec Deck Study Leaching Wood & Mulch Use Sectors Sorting Field FDEP/Sarasota Innovative Recycling Grant

33. laser x-ray Innovative Recycling Grant

34. Output signal for detection of treated wood Strobe Light On -Positive

35. Alt Chem Leach/Tox Under Review As & Cr Spec On-going Mulch Study Proposed Ash Problem Inventory Sorting Lab Ash Char & Trt Sorting Field Alt. Chem. Lit Review Minnesota Lit Review Alt Chem, As, Cr Spec Deck Study Leaching Wood & Mulch Use Sectors Sorting Field FDEP/Sarasota Innovative Recycling Grant Completed Add’l Deck & Dock FIU/NIEHS On-going

36. Alt Chem Leach/Tox Under Review As & Cr Spec On-going Mulch Study Proposed Ash Problem Inventory Sorting Lab Ash Char & Trt Sorting Field Alt. Chem. Lit Review Minnesota Lit Review Alt Chem, As, Cr Spec Deck Study Leaching Wood & Mulch Use Sectors Sorting Field FDEP/Sarasota Innovative Recycling Grant Completed Add’l Deck & Dock FIU/NIEHS On-going

37. Questions? Comments? Reports available at www.ccaresearch.org