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Diamond Grinding Use in NC
Ken Pace, P.E.
October 29, 2014
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Overview
• Regulations and Permits
• Hydrodemolition and Diamond Grinding
• Evolution
• Current Process for Disposal
• Lessons Learned
• Expectations
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Rules Governing Handling and Disposal
• Hazardous Waste (12.5 pH)
• Industrial Waste as defined in Statutes:
“any liquid, solid, gaseous, or other waste substance or
a combination thereof resulting from any process of
industry, manufacture, trade
or business, or from the
development of any natural
resource.”
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NCDOT Concrete Management
Slurry Disposal
• Bridge Hydrodemolition Projects
• Durham Freeway Pavement Rehabilitation
• Western Wake Freeway
• Other Notable Projects:
• I-485 / I-85 Project
• Goldsboro Bypass
• Fortify Project
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Hydrodemolition
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• Large Number of Projects
• No Release into Environment
• Older Material
• Cannot Recycle Water
• Smaller Particle Size
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Concrete Grinding
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• Increasing Number of Projects
• Large Volumes of Material
• New Concrete
• Can Recycle Water
• Larger Particle Size
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Disposal Options for Hydrodemolition Slurry
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1. Waste Water Treatment Plant or Other Permitted Facility
2. July 2011 Statewide Permit – Issued “Bridge Hydrodemolition Conjunctive Reclaimed Water Utilization”
Stringent Performance Standards
– Separate Liquids/Solids
– Solids(Residuals) Disposal
– Land Application with Effluent Limitations
– Setbacks from Wells and Surface Waters
– Extensive Sampling, Monitoring and Reporting Requirements
– Annual Reporting for Waste Water (Sampling Results, Volumes, Land Application Areas, )
– Record Keeping for Residuals (Haulers, Date Material Hauled, Estimated Volumes, Disposal Locations)
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Disposal Options for Hydrodemolition Slurry
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• Sampling Requirements Corrosivity, Ignitability, Reactivity and
Toxicity Characteristic Leaching Procedure (TCLP)
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Initial Disposal Options for Diamond
Grinding Slurry
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1. Waste Water Treatment Plant or Other Permitted
Facility
2. Dewater and Haul Solids
to Landfill
3. July 2012 “Western
Wake Freeway Project
Land Application of
Diamond Grinding Slurry”
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Project Specific Performance Standards
– Land Application of Slurry at Agronomic Rates (Dewatering Not Required)
– Operation and Maintenance Plan
– Mark Land Application Areas on Project or Off-Site
– Could not apply on slopes and ditches
– Setbacks from Wells, Surface Waters, Ditches, Bedrock Outcrops (15 ft.)
– Sampling, Monitoring and Reporting Requirements TCLP for Initial Application
– Ceiling Concentrations and Monthly Average Concentrations for Heavy Metals (Arsenic, Cadmium, Copper, Lead, Mercury, Molybdenum, Nickel, Selenium, Zinc)
– Annual Reporting for Waste Water (Sampling Results, Volumes, Land Application Areas)
2012 “Western Wake Freeway Project Land
Application of Diamond Grinding Slurry” Permit
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Current Concrete Slurry Permit
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• 2013 Land Application Permit for Hydrodemoliton and Diamond Grinding Slurry
• June 2014 Permit Modification
• Performance Standards Less Restrictive
– Slurry Can Be Applied on Land with Less Than 50% Groundcover without Incorporation or Injection within 24 Hours
– TCLP Analysis Requirement Removed
– Bi-monthly Sampling Removed and Monitoring Parameters Reduced (Calcium Carbonate Equivalence (CCE), Percent Solids, pH Each Truckload or Storage Unit/Tank, Soil Sampling)
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Disposal Options for Slurry
Current Land Application Permit − (Agronomic Rates, Waste Disposal Plan, Maintenance Plan, Landowner
Agreements, Operations Checklist, Inspection Logs, etc.)
Alternative Daily Cover in Municipal Landfill − (Solid Waste-Paint Filter Test, Non-Hazardous, DWM Approval, Meet
RCRA Regulatory Limits for Metals)
Beneficial Fill − (Inert Debris, Paint Filter Test, Non-Hazardous, Meet RCRA Regulatory
Limits for Metals, No Ground Water Impacts)
− Location OK for Long Term Disposal?
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Lessons Learned
Communication Is Important
Provide Updates to Regulatory Agencies
Not Waste Disposal but Beneficial Product
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When Bidding and Performing Work
Read Contract Specifications
Have A Waste Disposal Plan
Include Disposal Costs into Bid
Communicate Expectations to
Subcontractors
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When Bidding and Performing Work
Adhere to Permits Conditions,
Regulations, Project Specifications
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When Bidding and Performing Work
No Release to Environment
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