Risk Assessment of Disposal Options for Street Debris and Detention Basin Sediments Presented by...
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Transcript of Risk Assessment of Disposal Options for Street Debris and Detention Basin Sediments Presented by...
Risk Assessment of Disposal Options for Street Debris and Detention Basin Sediments
Presented by
Matthew Looft Kendall Clare McPeters
Danielle RoySarah UllmanLara Vowles
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
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
Sample AnalysisWinooski and South Burlington comparison
of metal concentrations for Street Sweeping Debris
Metal
WinooskiSample
Concentration
(mg/kg)
S. Burlington Sample
Concentration Range
(mg/kg)
Computed MaximumTCLP
Concentration of S. BurlingtonSamples (mg/L)
RegulatoryTCLP
Concentration
(mg/L)
Arsenic 4.77 7.24 - 7.79 0.39 5
Barium 20.6 18.7 - 23.5 1.18 100
Cadmium < 1.13* < 0.771 - < 0.960 < 0.048 1
Chromium
15.7 17.6 - 24.3 1.22 5
Lead 23.7* 16.1 - 19.0 0.95 5
Mercury < 0.302 < 0.381 - 2.59 0.13 0.2
Selenium <3.22* < 1.10 - < 1.37 < 0.068 1
Silver <1.61* < 1.10 - < 1.37 < 0.068 5
Source: Pioneer Environmental Associates, LLC., ENDYNE, INC.
Sample Analysis Continuedtotal petroleum hydrocarbons (TPH)
TPH (mg/kg) TPH Maximum Allowable
Amounts (mg/kg or ppm)
Street Sweeping
Sediments
90.8 1,000
Catch Basin Sediments
82.6 1,000
Source: ENDYNE, INC., Vermont Agency of Natural Resources
Winooski TPH Concentrations and Regulatory Levels
Results of Sample AnalysesTPH and RCRA metal concentrations well below Vermont ANR Guidelines
for
Petroleum Contaminated Soil and Debris
Hazardous Waste Management Regulations
*Beneficial Re-Use Possible!
Possible Risks if Above ANR 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
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
Environment and Human Health Risks
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
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
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
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?
Effect Analysis for Proposed Alternatives
Environmental Economic Social
No action N P N
Landfill cover M N M
Recreation Trails P M P
Compost Additive N P P
Road Sand M P P
Contaminant/ Adsorption material P P M
Construction fills P P P
To fill in bodies of water N P N
Crash Attenuation barriers P P P
High Priority Roads Close to Water bodies
Legend
Rivers
Roads
Water bodies
Roads of Concern with a 12% or greater slope or within 500 Feet of Water Sources
0 490 980 1,470 1,960245Meters
North
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
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
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
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