Diamond Grinding Use in NC. Ken Pace, P.E.

Transcription

1 Diamond Grinding Use in NC Ken Pace, P.E. October 29, 2014

2 Overview Regulations and Permits Hydrodemolition and Diamond Grinding Evolution Current Process for Disposal Lessons Learned Expectations 2

3 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. 3

4 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 4

5 Hydrodemolition Large Number of Projects No Release into Environment Older Material Cannot Recycle Water Smaller Particle Size 5

6 Concrete Grinding Increasing Number of Projects Large Volumes of Material New Concrete Can Recycle Water Larger Particle Size 6

7 Disposal Options for Hydrodemolition Slurry 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) 7

8 Disposal Options for Hydrodemolition Slurry Sampling Requirements Corrosivity, Ignitability, Reactivity and Toxicity Characteristic Leaching Procedure (TCLP) 8

9 Initial Disposal Options for Diamond Grinding Slurry 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 9

10 2012 Western Wake Freeway Project Land Application of Diamond Grinding Slurry Permit 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) 10

11 Current Concrete Slurry Permit 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) 11

12 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? 12

13 Lessons Learned Communication Is Important Provide Updates to Regulatory Agencies Not Waste Disposal but Beneficial Product 13

14 When Bidding and Performing Work Read Contract Specifications Have A Waste Disposal Plan Include Disposal Costs into Bid Communicate Expectations to Subcontractors 14

15 When Bidding and Performing Work Adhere to Permits Conditions, Regulations, Project Specifications 15

16 When Bidding and Performing Work No Release to Environment 16