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Supplemental Study for Year 3

Supplemental Study for Year 3. Reason for Supplemental Study. Accelerate new lines of research. Tasks Assoc. with Supplemental Funds. Depletion of Cr, Cu, and As during the service life of CCA-treated wood (task 1) Quantity of CCA-treated wood used by major industries (task 2)

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Supplemental Study for Year 3

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  1. Supplemental Study for Year 3

  2. Reason for Supplemental Study • Accelerate new lines of research.

  3. Tasks Assoc. with Supplemental Funds • Depletion of Cr, Cu, and As during the service life of CCA-treated wood(task 1) • Quantity of CCA-treated wood used by major industries (task 2) • TCLP and SPLP tests for unburned CCA-treated wood (task 5) • Laboratory Methods for Cr and As speciation (task 3) • Identify laboratory methods for organics analysis assoc. with alternative chemicals (task 4) In-Service Issues Disposal Literature Review

  4. Task 5:TCLP and SPLP Tests on Unburned CCA-Treated Wood

  5. CCA-Treated Wood and Mulch Leaching Tests

  6. Background • Year 1 Study -- Collected samples of processed wood from C&D debris recycling facilities in Florida. Found that approximately 6% of wood stream was CCA-treated. • Year 2 Study -- Characterized ash from the combustion of CCA-treated wood and wood mixtures. Found that the presence of 5% CCA-treated wood caused ash to fail TCLP and be characterized as a hazardous waste.

  7. Background • No leaching studies were conducted on unburned CCA-treated wood as part of year 1 and 2 studies.

  8. When is Leaching a Concern? • Leaching during In-Service Use • Leaching during Storage • Leaching upon Reuse of Mulch • Leaching during Disposal

  9. Leaching Tests on Unburned CCA-Treated Wood in Year 3 Supplemental Project • Leaching of new CCA-treated wood using standardized regulatory leaching tests • Leaching of wood mulch produced by C&D debris recycling operations

  10. Leaching of newCCA-treated wood using standardized regulatory leaching tests

  11. Types of Leaching Tests • Batch Tests • Toxicity Characteristic Leaching Procedure (TCLP) • Synthetic Precipitation Leaching Procedure (SPLP) • Column Tests • Field Tests

  12. Testing Results to be Discussed • Ten samples of CCA-treated wood purchased from home supply stores • TCLP • SPLP • Particle Size • One sample • TCLP, SPLP, EP, WET, MEP

  13. Reminder for Arsenic • Toxicity Characteristic • Arsenic: 5 mg/l • Chromium: 5 mg/l • Groundwater Cleanup Target Level • Arsenic: 0.05 mg/l • Chromium: 0.10 mg/l • Copper: 1 mg/l

  14. How are TCLP and SPLP Tests Applied? • TCLP: To determine if solid waste is hazardous by toxicity characteristic. Note: Discarded arsenical-treated wood is exempt under RCRA. • TCLP: To determine is hazardous waste can be land disposed. • SPLP: To determine if land-applied waste or contaminated soil presents a risk to groundwater from chemical leaching.

  15. TCLP and SPLP • Batch tests. • TCLP: Municipal Landfill • SPLP: Acidic Rain • 100 g of waste per 2 L of leaching solution. • Extracted for 18 hours. • Leachate if filtered and analyzed.

  16. TCLP: Arsenic(Sawdust)

  17. TCLP: Chromium(Sawdust)

  18. TCLP: Copper(Sawdust)

  19. SPLP: Arsenic(Sawdust)

  20. SPLP: Chromium(Sawdust)

  21. SPLP: Copper(Sawdust)

  22. TCLP ArsenicImpact of Particle Size Chips 5 Blocks 1 Block Sawdust

  23. Comparison ofSPLP & TCLP (As)

  24. Comparison ofSPLP & TCLP (Cu)

  25. Comparison ofBatch Leaching Tests(Arsenic) SPLP EP WET TCLP

  26. Multiple Extraction Procedure(Arsenic)

  27. Implications of Leaching Tests • Without the exclusion, CCA-treated wood would often be a characteristic hazardous waste. • If SPLP results are compared to GWCTLs, should not be disposed in an unlined landfill (based on current policy for other wastes).

  28. What About Reuse Outside the Landfill (wood mulch)?

  29. Mulch Bagging Operation

  30. Leaching from Land Applied Mulch • The SPLP is the test most commonly used to assess leaching from a land applied waste.

  31. C&D Wood MulchAs in SPLP Leachates Total Samples: 58 Mean: 153 ug/l Range: 21 to 658 ug/l 51 Samples > 50 ug/l 0 50 100 200 300 400 500 600 Arsenic Concentration (ug/l)

  32. Implications for Mulch • When considering SPLP leaching, CCA-treated wood must be present at levels of less than 1% in wood mulch to meet current groundwater standards. • Most C&D wood samples are already greater than 1%.

  33. Task 2: Major Use Sectors

  34. Cumulative Arsenic Quantities

  35. Florida Production

  36. U.S. Southern Pine Markets (From SFPA) 10% 36% 18% 8% 15%

  37. Double-Check Values for Florida • Focus • Transportation Sector • Utility Poles • Docks

  38. Transportation Sector • Initial contact with FDOT Districts

  39. Utility Poles • Compiled volume of treated wood for 1998 from questionnaires sent out last year • Scaled data by population served • Scaled 1998 data against US historical pole production statistics

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