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Supplemental Study for Year 3

Supplemental Study for Year 3. Project Completed. Reason for Supplemental Study. Accelerate new lines of research which were identified in August 1999 during the deliberations concerning a ban on CCA in Minnesota. Tasks Assoc. with Supplemental Funds.

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Supplemental Study for Year 3

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  1. Supplemental Study for Year 3 Project Completed

  2. Reason for Supplemental Study • Accelerate new lines of research which were identified in August 1999 during the deliberations concerning a ban on CCA in Minnesota

  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. 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

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

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

  9. 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

  10. 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

  11. 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 wastes can be land disposed. • SPLP: To determine if land-applied waste or contaminated soil presents a risk to groundwater from chemical leaching.

  12. 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.

  13. Leaching Tests • 10 samples of new CCA-treated dimensional lumber were collected from retail outlets • The wood was processed into 4 different sizes • TCLP and SPLP performed on all samples • Additional leaching tests (EP Tox, MEP, WET) were performed on one sample.

  14. Figure IV.3: SPLP Extraction Results for As, Cu, and Cr from Saw Dust

  15. Figure IV.6: SPLP Extraction Results for As, Cu, and Cr from 1, 100-g Block

  16. Figure IV.7: TCLP Extraction Results for As, Cu, and Cr from Sawdust

  17. Figure IV.10: TCLP Extraction Results for As, Cu, and Cr from 100-g Block

  18. Figure IV.11: Arsenic Concentration in Extracts from TCLP, SPLP, EPTOX, and WET

  19. Figure IV.14: MEP Test Results for Arsenic, Copper, and Chromium Using 3 20-g Blocks

  20. 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).

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

  22. Mulch Bagging Operation

  23. Leaching from Land Applied Mulch • SPLP was performed on samples of processed wood from C&D debris recycling facilities • SPLP was also performed on several samples of other mulches, including commercial colored mulch

  24. Table IV.7: Samples Exceeding the GWCTL

  25. 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%.

  26. Questions?

  27. Task 2: Major Use Sectors

  28. Objectives • Estimate the distribution of CCA within different use sectors • Production & disposal by product type • Total amount of As currently in service • Breakdown use – U.S. Statistics - Florida Statistics (utility poles/docks)

  29. Production and Disposal By Product Type (Florida)

  30. Production and Disposal By Product Type (Florida)

  31. Amount of As Currently In Service FloridaStatistics

  32. 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

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

  34. Florida Use Statistics • Focus • Utility Poles • Docks (Marine & Freshwater)

  35. Utility Poles

  36. Residential Docks • Evaluated data for 3 counties (Alachua, Dade and Leon)

  37. Material distribution in Alachua County Docks Predominantly Freshwater Docks

  38. Material distribution in Leon County Docks Predominantly Freshwater Docks

  39. Material distribution in Dade County Docks Predominantly Salt water Docks

  40. Results

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