Environmental Assessment Part II, Sections 5 to 13
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Environmental Assessment Part II, Sections 5 to 13 Assessment of Effects and Mitigation Measures Draft Version April 2013 Transport Canada New Bridge for the St. Lawrence Environmental Assessment Part II, Sections 5 to 13 Assessment of Effects and Mitigation Measures April 2013 TC Ref.: T8080-110362 Dessau Ref.: 068-S-0000810-0-00-110-01-EN-R-0004-0D EXECUTIVE SUMMARY This report covers the second phase in the environmental assessment process, i.e. the description of the effects that the project will have on the environment and proposed mitigation measures. Part one dealt with a description of the project and the environment. To identify the potential effects of the project, the relationships between the various project phases and the environmental components were established. For each effect, the significance of the effect was assessed according to three parameters, intensity, duration and scope. Mitigation measures were identified to reduce the significance of the effects and ensure that the residual effects are not significant within the meaning of the Canadian Environmental Assessment Act, S.C. 1992, c. 37 (CEAA). Because the project design is at the preliminary phase, a number of environmental effects will be considered during the upcoming design phases in order to reduce the impacts during the work. Additional studies are also planned during the process to refine the analysis of certain effects. In terms of the physical environment, the main effects have to do with soil, groundwater and surface water quality. Because of soil and groundwater contamination, measures must be implemented to avoid the spread of contaminants into the environment. As a large proportion of the construction work will take place in or near the water, a number of mitigation measures must be put in place to limit dispersal of suspended solids and contaminants in the water. Water quality will be monitored throughout the work to ensure that requirements are met. In short, the effects on the physical environment are considered non-significant once the proposed mitigation measures are taken into account. As for air quality and greenhouse gases, measures will be taken to mitigate the effects during the construction phase. For the operations phase, the changes in atmospheric emissions can be established at the subsequent design stages, once the supply and configuration of mass transit options is known. During construction of the structures, there is a danger that wetlands along the riverbank will be disrupted. Measures must be taken to limit such losses and a compensation project for the ecological functions must be developed. Effects on the fish habitat, migratory birds and endangered species are expected during the construction and deconstruction phases. The project may result in the disruption, deterioration and loss of fish habitats that are deemed sensitive. A compensation program will be required to mitigate those effects, where applicable. Nesting of migratory birds may be disturbed during the work. Restriction periods will be in effect in order to minimize the disruptions. Species at risk (peregrine falcon and American eel) may also be impacted by the project. The peregrine falcon nesting site will have to be relocated, however the river currents near the work are not expected to prevent eel migration. Species with provincial 068-P-0000810-0-00-110-01-EN-R-0004-0D NEW BRIDGE FOR THE ST. LAWRENCE – ENVIRONMENTAL ASSESSMENT i status are also found in the area. Specific measures will have to be taken to mitigate the effects on the brown snake, lake sturgeon, American shad, chain pickerel and rosyface shiner. Once the mitigation measures and compensation projects are taken into account, the effects on the biological environment are considered non-significant. In terms of the human environment, the main effects are on the sound environment and archeology. The surrounding sound environment will be affected both by the construction work and by operation of the infrastructures. Considering the sensitive areas, noise mitigation measures are planned for both phases. A noise management program must be in place from the outset of the work in order to comply with requirements. Because there is a recognized archeological site at the foot of the bridge, measures will have to be taken to preserve the integrity of the remains. The environmental effects on the human environment are considered non-significant once the mitigation measures are taken into account. An analysis of the cumulative effects and the effects of the environment on the project has also shown that the project does not have significant residual effects. An emergency response plan will also have to be implemented to limit the effects of accidents and malfunctions. To ensure that environmental requirements are met, Transport Canada and the private partner will have to put in place an environmental management system, whereby monitoring and supervision of mitigation measures and the performance objectives set during the environmental assessment will be ensured, providing accountability, where necessary. Based on the information contained in this report, the responsible authorities will be in a position to make a decision pursuant to subsection 20(1) of the CEAA. 068-S-0000810-0-00-110-01-EN-R-0004-0D NEW BRIDGE FOR THE ST. LAWRENCE – ENVIRONMENTAL ASSESSMENT ii TABLE OF CONTENTS LIST OF ACRONYMS.......................................................................................................................XI GLOSSARY.................................................................................................................................... XIV BACKGROUND ................................................................................................................................. 1 5 INFORMATION SESSIONS / PUBLIC AND FIRST NATIONS CONSULTATION SESSIONS.................................................................................................................................... 3 5.1 Public and First Nations consultation approach.................................................................. 3 5.2 Concerns raised.................................................................................................................. 3 5.2.1 Environmental assessment guidelines................................................................................ 3 5.2.2 Primary concerns regarding the environmental assessment.............................................. 4 5.2.3 Aspects outside the scope of the environmental assessment............................................ 4 6 METHOD OF ASSESSMENT OF ENVIRONMENTAL EFFECTS............................................... 7 6.1 Assessment methodology................................................................................................... 7 6.1.1 Identification and assessment of effects............................................................................. 7 6.1.2 Determining the significance of an environmental effect .................................................... 7 6.1.2.1 Intensity of the effect ..........................................................................................................7 6.1.2.2 Duration of the effect ..........................................................................................................8 6.1.2.3 Scope of the effect..............................................................................................................8 6.1.2.4 Assessment of the potential effect......................................................................................8 6.1.3 Mitigation measures............................................................................................................ 9 6.1.4 Residual effects................................................................................................................... 9 7 ENVIRONMENTAL EFFECTS AND MITIGATION MEASURES............................................... 10 7.1 Identification of the potential effects of the project............................................................ 11 7.2 Assessment of potential project effects ............................................................................ 16 7.2.1 Analysis of environmental effects and mitigation measures............................................. 16 7.3 Environmental design criteria............................................................................................ 43 7.3.1 Management of contaminated excavated material (CC-2, CC-3, CC-22) ........................ 43 7.3.2 Protection of wetlands and water quality (CC-1, CC-19 to CC-21) .................................. 44 7.3.3 Fish habitat protection (CC-5, CC-6) ................................................................................ 44 7.3.4 Avifauna (CC-15 and CC-16)............................................................................................ 52 7.3.5 Commercial ship traffic (S-16) .......................................................................................... 52 7.3.6 Sound environment (CC-17) ............................................................................................. 52 7.3.7 Air quality (CC-23).............................................................................................................53 7.3.8 Archeology (CC-4 and CC-18).......................................................................................... 53 7.3.9 Integration of project into the environment (CC-7 to CC-14) ...........................................