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Risk Assessment of Disposal Options for Street Debris and Detention Basin Sediments

Risk Assessment of Disposal Options for Street Debris and Detention Basin Sediments. Presented by Matthew Looft Kendall Clare McPeters Danielle Roy Sarah Ullman Lara Vowles. Project Background.

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Risk Assessment of Disposal Options for Street Debris and Detention Basin Sediments

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  1. Risk Assessment of Disposal Options for Street Debris and Detention Basin Sediments Presented by Matthew Looft Kendall Clare McPeters Danielle Roy Sarah Ullman Lara Vowles

  2. Project Background • Winooski has limited and costly collection techniques for street sweeping debris and catch basin sediments • Interested in beneficial re-use alternatives for these sediments

  3. Our Response… • Street debris and catch basin sediment analysis • Alternatives for beneficial re-use that stress environmental integrity • Case Studies of re-use successes • Simple effects analysis of these alternatives • Recommendations

  4. Sample AnalysisWinooski and South Burlington comparisonof metal concentrations for Street Sweeping Debris Source: Pioneer Environmental Associates, LLC., ENDYNE, INC.

  5. Sample Analysis Continuedtotal petroleum hydrocarbons (TPH) Winooski TPH Concentrations and Regulatory Levels Source: ENDYNE, INC., Vermont Agency of Natural Resources

  6. Results of Sample Analyses TPH and RCRA metal concentrations well below Vermont ANR Guidelines for  Petroleum Contaminated Soil and Debris • Hazardous Waste Management Regulations *Beneficial Re-Use Possible!

  7. Possible Risks if AboveANR Guidelines • TPH: Total Petroleum Hydrocarbons • Minimal exposure is unavoidable • Acute exposure can cause adverse reactions in the blood, skin, eyes, legs (paralysis), immune system • Can linger in soils, film on surface waters, or settle into bottom sediments

  8. Possible Risks Continued… • RCRA 8 Metals: arsenic, barium, cadmium, chromium, lead, mercury, selenium, silver • Bioaccumulation in plant and animal tissue • Threats to microorganisms in soil ecosystems • Severe allergic reactions • Carcinogenicity • Damaging effects to nervous system and/or brain of fetuses • DNA damage

  9. Environment and Human Health Risks

  10. Alternative Reuses if Above ANR Guidelines • Compost • Biologically decomposes organics • Thermal desorption of some volatile organics • Simple process (windrows, turning, wetting) • Valuable topsoil or mulch as end product • Biological Degradation • Inoculating with soil bacteria, mycelial fungi to enhance decomposition of pollutants and residues

  11. Suggested Alternatives for Winooski • “No action” – Continued disposal in landfills • Daily cover at landfills • Compost additive • Road sand • Containment/absorption material • Roadway fill or backfill • Sub-fill for potholes • Replacement for raw material in concrete or asphalt • Land reclamation

  12. Case Studies • Bloomington, MN: 100% reduction of landfilling sweepings by reusing as road sand • Bangor, ME: reuse as clay composite for rec. trails • Worcester, MA: development of guidelines for finding reuse alternatives (Chelsea Center) • Colorado Springs, CO: 100% reduction of landfilled CB sediments by facility for dewatering, screening, composting

  13. Reuse Initiatives Possibility for an in depth study on beneficial reuse of street sweepings and catch basin sediments to happen at UVM to benefit the Burlington, Winooski, Williston communities?

  14. Effect Analysis for Proposed Alternatives

  15. High Priority Roads Close to Water bodies North

  16. Community Collaboration and Beyond… SAND Model • Sediment Accumulation Nexus District • Regional Collection Community Sediments • Analysis • Shred/Sort • Wash • Screen • Storage • Trade for credits • Sell to business or public

  17. Beneficial Reuse • Reapplication for transportation use • Mixed with clay for recreational paths at Gilbrook Park • Landfill daily/weekly cover for Chittenden Solid Waste District • Compost additive at the Intervale • Roadway fill or backfill at construction sites • Fill in crash attenuation barriers along Interstate 89 • Containment/absorption medium for hazardous material spill response

  18. On Site Remediation • Composting • Biological decomposition of organics • Thermal desorption of volatile organics • Biological Degradation • Nutrient cycling • Waste and residue decomposition • Detoxification of environmental pollutants • Immobilization • Aggregates in concrete or asphalt

  19. Recommendations Beneficial Reuse will -Be more effective than current practices -Pay for itself over time -Reduce ‘new sand’ by 90-100% *Winooski should initiate a local beneficial reuse program to serve as an example for a county wide SAND program

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