Environmental Assessment for a New Landfill …

1 Waste Management of Canada Corporation Environmental Assessment for a New Landfill Footprint at the west carleton Environmental Centre ATMOSPHERIC Landfill GAS (VOC) DETAILED IMPACT Assessment Prepared by: RWDI Project Number: 60242342 Date: August, 2012 Atmospheric Landfill Gas (VOC) Detailed Impact Assessment west carleton Environmental Centre T a b l e o f C o n t e n t s Page 1. Introduction .. 1 Description of the Preferred Alternative Landfill Footprint .. 3 Facilities Characteristics Report.

2 3 Other WCEC Facilities .. 4 Atmospheric Air Quality Study Team .. 4 Contaminants of Interest .. 5 Applicable Guidelines .. 6 Emission Sources .. 7 Existing Landfill Mound under Final Cover .. 7 Preferred Alternative Landfill Footprint .. 8 Contaminated Soil Stockpiles .. 9 Landfill Gas-Fired Generators and Flares .. 9 Leachate Management System .. 11 Off-Site Sources .. 13 2. Landfill Footprint Study Areas .. 14 3. Methodology .. 17 Assessment 17 Emission Rate Development .. 18 Existing Landfill Gas Emission Rate Calculations.

3 18 Preferred Alternative Landfill Gas Emission Rate Calculations .. 19 Landfill Gas-Fired Generator and Flares .. 21 Contaminated Soil Stockpile Emission Rate Calculations .. 21 Leachate Management System Emission Rate Calculations .. 23 Landfill Gas Calibration Factor .. 26 Dispersion Modelling .. 27 Compounds 27 Sources Modelled .. 28 Meteorological Data .. 29 Area of Modelling .. 29 Terrain Data .. 30 Building Information .. 30 Averaging Periods Used .. 30 4. Additional Investigations.

4 31 5. Detailed Description of the Environment Potentially Affected .. 31 Preferred Leachate Management System .. 31 On-Site and in the Vicinity .. 31 Discrete Receptors .. 33 Atmospheric Landfill Gas (VOC) Detailed Impact Assessment west carleton Environmental Centre 6. Detailed Description of the Environment Potentially Affected with Contingency Leachate Management Method .. 38 Contingency Leachate Management System .. 38 On-site and in the Vicinity .. 38 Discrete Receptors .. 39 7. Environmental Air Quality Net Effects.

5 40 Potential Effects on Atmospheric Environment .. 40 Additional Mitigation and/or Compensation Measures .. 40 Potential Impacts on the Environment with Additional Mitigation 41 Net Effects .. 41 8. Impact Analysis of Other WCEC Facilities .. 44 9. Monitoring and Commitments for the Undertaking .. 45 Monitoring Strategy and Schedule .. 45 Environmental Effects Monitoring .. 45 Development of an Environmental Management Plan .. 45 Commitments .. 46 10. Environmental Air Quality Approvals Required for the Undertaking.

6 46 11. References .. 47 List of Grap hs Graph 1. Summary of Landfill Gas Collected from Existing Landfill and Proposed Preferred Alternative Landfill and Maximum Equipment Capacity .. 11 List of Fig ures Figure 1. Preferred Alternative Landfill Footprint .. 2 Figure 2. Preferred Alternative Landfill Footprint .. 15 Figure 3. WCEC Landfill Site Plan including Modelled Sources .. 16 Atmospheric Landfill Gas (VOC) Detailed Impact Assessment west carleton Environmental Centre List of Tables Table 1.

7 Summary of Applicable Criteria for Landfill Gas Compounds .. 6 Table 2. Summary of Emission Sources Included in Each Landfill Gas Modelling Scenario .. 18 Table 3. Summary of Maximum Predicted 24-Hour Concentrations Off-site for Each Future Build Scenario .. 32 Table 4. Summary of Maximum Benzene Predicted Annual Concentrations .. 33 Table 5. Summary of Maximum Predicted 24-Hour Concentrations at Discrete Receptor for Each Future Build Scenario .. 34 Table 6. Summary of Maximum Predicted 10-Minute Concentrations at Discrete Receptor for Each Future Build Scenario.

8 35 Table 7. Maximum Predicted 24-Hour Vinyl Chloride Concentrations at Discrete Receptors for Each Future Build Scenario Preferred Leachate Management System .. 35 Table 8. Maximum Calibrated[1] Predicted 10-Minute Hydrogen Sulphide Concentrations for Each Future Build Scenario .. 36 Table 9. Maximum Calibrated[1] Predicted Hydrogen Sulphide 24-Hour Concentrations for Each Future Build Scenario .. 36 Table 10. Maximum Predicted 24-Hour Benzene Concentrations for All Future Build Scenario.

9 37 Table 11. Maximum Predicted Concentrations Off-site for Each Future Build Scenario Contingency Leachate Option .. 39 Table 12. Maximum Predicted Concentrations at Discrete Receptors for Each Future Build Scenario Contingency Leachate Management System .. 39 Table 13. Summary of Baseline and Future Build Maximum Predicted Concentrations Impacts at the Property Line .. 42 Table 14. Summary of Baseline and Future Build Maximum Predicted Concentrations Impacts at the Worst-Case Receptor.

10 42 Table 15. Potential Effects, Proposed Mitigation and Compensation Measures, and Resulting Net Effects .. 43 Atmospheric Landfill Gas (VOC) Detailed Impact Assessment west carleton Environmental Centre Ap pe ndices Appendix A1. Existing Landfill Mound LFG Emission Rates Based on Scaling 2010 Flow Data Appendix A2. Preferred Alternative Landfill Mound and Active Stage Emission Rates Based on LANDGEM data Appendix A3. LFG-Fired Generators and Flares Emission Rates Appendix B. Contaminated Soil Stockpile Emission Rates Appendix C1.