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REVISED PROJECT DESCRIPTION AND ENVIRONMENTAL IMPACT ASSESSMENT (EIA) REGISTRATION FOR THE NEPISIGUIT FALLS GENERATING STATION MODIFICATION AND REHABILITATION PROJECT Thus, in consideration of the nature of the interactions and the planned implementation of known and proven mitigation, the potential environmental effects of the Project activities and physical works ranked as 0 or 1 in Table 4.3 on the Aquatic Environment are rated not significant, and are not considered further in the assessment. 4.3.4 Assessment of Project-Related Environmental Effects The following interactions were ranked as 2 in Table 4.3 and are considered further in the assessment of Project-related environmental effects: • installation of the Coffer Dam; • installation of the Working Platform; and • removal of the Coffer Dam and Working Platform. A summary of the environmental effects assessment and prediction of residual environmental effects resulting from interactions ranked as 2 on the Aquatic Environment is provided in Table 4.4. Page 52 June 15, 2011
REVISED PROJECT DESCRIPTION AND ENVIRONMENTAL IMPACT ASSESSMENT (EIA) REGISTRATION FOR THE NEPISIGUIT FALLS GENERATING STATION MODIFICATION AND REHABILITATION PROJECT Table 4.4 Summary of Residual Project-Related Environmental Effects on the Aquatic Environment Project Phases, Activities, and Physical Works Potential Project-Related Environmental Effects Proposed Mitigation/ Compensation Measures Residual Environmental Effects Characteristics Direction Magnitude Geographic Extent Duration and Frequency Reversibility Ecological/Socioeconomic Context Significance Prediction Confidence Likelihood Cumulative Environmental Effects Recommended Follow-up and Monitoring Construction • Installation of the Coffer Dam • Installation of the Working Platform; and • Removal of the Coffer Dam and Working Platform Change in Aquatic Environment • Harmful alteration, disruption, or destruction (HADD) of fish habitat; • Release of deleterious substances (TSS or hazardous substances) into the freshwater environment; • Potential for incidental mortality. • Installation of the Coffer Dam to minimize the draw down required and to reduce fish habitat to be disrupted; • Implement well established and proven erosion and sedimentation control measures (e.g., silt curtains, check dam, settling pond); • Turbid water collected in the settling pond will be pumped over existing vegetation a sufficient distance away (more than 30 m from the watercourse); • Complete the Project during normal low flow periods (June 1 through September 30, 2012); • Conduct fish rescue as necessary within the forebay in the area between the Coffer Dam and power house during dewatering; • HADD compensation in accordance with the DFO Policy for the Management of Fish Habitat; • Proper storage of hazardous materials; and • Compliance with all provincial and federal legislation, permits, approvals and guidelines. A L L ST/ S R D N H M N • Water quality monitoring within the LAA for TSS during Construction activities if visible plumes occur. • Evaluation of sediments in the vicinity of the former Bathurst Mines will be undertaken to identify and remove potentially toxic mine waste that might otherwise be exposed to the atmosphere. • Water levels and tributary access in the headpond will be monitored to confirm fish passage is maintained. June 15, 2011 Page 53
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Brunswick PERMIT FOR WATERCOURSE AN
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