Environmental Impact Statement for the EnCana Shallow Gas Infill Development in CFB Suffield National Wildlife Area VOLUME 6 AIR, NOISE AND HUMAN HEALTH ASSESSMENT EnCana Corporation May 2007 EnCana Shallow Gas Infill Development in CFB Suffield National Wildlife Area Table of Contents Table of Contents 1 Introduction to Air, Noise and Human Health Assessment .................................... 1-1 2 Air Quality Assessment............................................................................................. 2-1 2.1 Executive Summary ..................................................................................................... 2-1 2.2 Introduction .................................................................................................................. 2-4 2.2.1 Project Description ........................................................................................... 2-6 2.3 Study Area Boundaries ................................................................................................ 2-6 2.3.1 Spatial .............................................................................................................. 2-6 2.3.2 Temporal .......................................................................................................... 2-7 2.4 Key Air Quality Issues .................................................................................................. 2-7 2.4.1 Regional Issues................................................................................................ 2-9 2.4.2 Local Issues ..................................................................................................... 2-9 2.5 Valued Ecological Components ................................................................................... 2-9 2.5.1 Project – VEC Interactions ............................................................................. 2-10 2.6 Methods ..................................................................................................................... 2-11 2.6.1 Overall Assessment Approach ....................................................................... 2-11 2.6.2 Criteria for Evaluating Environmental Effects Significance ............................. 2-11 2.6.3 Ambient Air Quality Assessment Criteria ........................................................ 2-11 2.6.4 Dispersion Modelling ...................................................................................... 2-12 2.6.5 Meteorology ................................................................................................... 2-15 2.6.6 Modelling Scenarios ....................................................................................... 2-15 2.7 Existing Conditions .................................................................................................... 2-17 2.7.1 Introduction .................................................................................................... 2-17 2.7.2 Ambient Air Quality Monitoring ....................................................................... 2-17 2.7.3 Baseline Emissions ........................................................................................ 2-18 2.7.4 Baseline Scenario Predictions ........................................................................ 2-18 2.7.5 Summary and Conclusions ............................................................................ 2-19 2.8 Project Environmental Effects Assessment and Mitigation Measures ........................ 2-20 2.8.1 Project Effects by Air Quality VEC, Source and Project Phase ....................... 2-20 2.8.1.1 Construction Phase ............................................................................ 2-20 2.8.1.2 Operations Phase ............................................................................... 2-22 2.8.1.3 Decommissioning and Abandonment Phase ...................................... 2-23 2.8.1.4 Conclusions ........................................................................................ 2-23 2.9 Cumulative Effects ..................................................................................................... 2-24 2.10 Malfunctions and Accidents ....................................................................................... 2-24 2.11 Follow-up and Monitoring ........................................................................................... 2-25 3 Noise........................................................................................................................... 3-1 3.1 Executive Summary ..................................................................................................... 3-1 3.1.1 Introduction ...................................................................................................... 3-1 EnCana Corporation May 2007 Page i EnCana Shallow Gas Infill Development in CFB Suffield National Wildlife Area Table of Contents 3.2 Introduction .................................................................................................................. 3-2 3.3 Study Area Boundaries ................................................................................................ 3-3 3.3.1 Spatial .............................................................................................................. 3-3 3.3.2 Temporal .......................................................................................................... 3-3 3.4 Key Noise Issues ......................................................................................................... 3-3 3.4.1 Regional Issues ................................................................................................ 3-4 3.4.2 Local Issues...................................................................................................... 3-4 3.4.3 Effects on Noise on Wildlife .............................................................................. 3-5 3.5 Valued Ecological Components .................................................................................... 3-5 3.6 Methods ....................................................................................................................... 3-5 3.7 Existing Conditions ....................................................................................................... 3-6 3.7.1 Description of Baseline Conditions ................................................................... 3-6 3.7.2 Selected Baseline Continuous Monitoring Sites ................................................ 3-6 3.7.3 Evaluating Baseline Conditions....................................................................... 3-10 3.7.4 Summary and Conclusions ............................................................................. 3-11 3.8 Project Environmental Effects Assessment ................................................................ 3-12 3.8.1 Predicted Noise Levels for the Project ............................................................ 3-12 3.8.2 Other Project Related Noise Sources ............................................................. 3-13 3.8.3 Mitigation ........................................................................................................ 3-14 3.8.4 Environmental Effects Assessment by Valued Ecological Component and Project Phase ................................................................................................. 3-14 3.8.4.1 Environmental Noise ........................................................................... 3-14 3.8.5 Summary of Residual Environmental Effects .................................................. 3-16 3.9 Accidents and Malfunctions ........................................................................................ 3-16 3.10 Cumulative Effects ..................................................................................................... 3-17 3.11 Follow-up and Monitoring ........................................................................................... 3-17 4 Human Health ............................................................................................................. 4-1 4.1 Executive Summary ..................................................................................................... 4-1 4.2 Introduction .................................................................................................................. 4-2 4.3 Study Area Boundaries ................................................................................................ 4-2 4.3.1 Spatial .............................................................................................................. 4-2 4.3.2 Temporal .......................................................................................................... 4-3 4.4 Key Human Health Issues ............................................................................................ 4-3 4.4.1 Valued Ecological Component .......................................................................... 4-5 4.5 Methods ....................................................................................................................... 4-5 4.5.1 Guiding Principles ............................................................................................. 4-5 4.5.2 Overall Assessment Approach .......................................................................... 4-6 4.5.2.1 Problem Formulation ............................................................................. 4-8 4.5.2.2 Toxicity Assessment ..........................................................................