Environmental Impact Assessment(EIA) Registration for the ...

More documents

Recommendations

Info

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 Residual Environmental Effects for all Phases KEY: Direction P Positive. A Adverse. Magnitude L Low: No or negligible Change in Aquatic Environment; alteration authorized by provincial and/or federal authorities. M Moderate: Measurable change that does not result in a change in the sustainability of fish populations.; alteration authorized by provincial and/or federal authorities H High: Measurable change that results in a change in the sustainability of fish populations; alteration not authorized by provincial and/or federal authorities. Geographic Extent S Site-specific: Within the PDA. L Local: Within the LAA. Duration ST Short term: Occurs and lasts for short periods (e.g., days/weeks). MT Medium term: Occurs and lasts for extended periods of time (e.g., years). LT Long term: Occurs during Construction and/or Operation and lasts for the life of Project. P Permanent: Occurs during Construction and Operation and beyond. Frequency O Occurs once. S Occurs sporadically at irregular intervals. R Occurs on a regular basis and at regular intervals. C Continuous. Reversibility R Reversible. I Irreversible. N H L N Ecological/Socio-economic Context U Undisturbed: Area relatively or not adversely affected by human activity. D Developed: Area has been substantially previously disturbed by human development or human development is still present. N/A Not Applicable. Significance S Significant. N Not Significant. Prediction Confidence Based on scientific information and statistical analysis, professional judgment and effectiveness of mitigation: L Low level of confidence. M Moderate level of confidence. H High level of confidence. Likelihood Based on professional judgment: L Low probability of occurrence. M Medium probability of occurrence. H High probability of occurrence. Page 54 June 15, 2011
REVISED PROJECT DESCRIPTION AND ENVIRONMENTAL IMPACT ASSESSMENT (EIA) REGISTRATION FOR THE NEPISIGUIT FALLS GENERATING STATION MODIFICATION AND REHABILITATION PROJECT The Project has the potential to affect the Aquatic Environment due to: • temporary alteration or disruption of fish habitat; • the unplanned or accidental release of deleterious substances or sediments into watercourses; and • potential incidental mortality of fish. Installation of the Coffer Dam, Installation of the Working Platform and removal of the Coffer Dam and Working Platform may result in the temporary alteration or disruption of fish habitat in the LAA as a result of the Project through the release TSS or hazardous substances into the water and temporary lowering of water level. High concentrations of suspended sediment in water may be deemed a deleterious substance under the Fisheries Act, may adversely affect fish habitat, and may be injurious to fish. TSS and other substances may also be considered pollutants under applicable New Brunswick legislation. A temporary alteration or disruption of fish habitat upstream of the NFGS may occur as a result of water level draw down, which is necessary to accommodate Project activities. Fish mortality could occur directly or indirectly as a result of these construction activities. Mine waste present in the headpond, if re-suspended into the water column or left exposed to the atmosphere (leading to oxidation of sulphide minerals) could also lead to the introduction of deleterious substances (or pollution) into the water column. Effective Project planning, design, avoidance, and the application of known and proven mitigation measures will be implemented as part of the Project to avoid or minimize the environmental effects on the Aquatic Environment. The following mitigation measures will be employed: • install a Coffer Dam to minimize the draw down required and to reduce potential environmental effects on fish habitat; • implement well established and proven erosion and sedimentation control measures around the Coffer Dam (e.g., silt curtains, check dam, settling pond); • collect turbid water in the settling pond, and dispose of this water by pumping over existing vegetation a sufficient distance away (more than 30 m from the watercourse) to prevent suspended solids from entering the river; • complete work having the potential to affect the Aquatic Environment during normal low flow period (June 1 through September 30, 2012); • conduct fish rescue as necessary within the forebay during dewatering; • implement any required HADD compensation in accordance with the DFO Policy for the Management of Fish Habitat; June 15, 2011 Page 55
Page 1:
Revised Project Description and Env
Page 4 and 5:
REVISED PROJECT DESCRIPTION AND ENV
Page 6 and 7:
Page 8 and 9: REVISED PROJECT DESCRIPTION AND ENV
Page 16 and 17: Boom Headpond Main Dam and Sluicewa
Page 93 and 94: View of the Spillway Dam Showing Wo
Page 95 and 96: Client: New Brunswick Power Corpora
Page 97: Client: New Brunswick Power Corpora
Page 102 and 103: Scale: Job No.: Figure No.: Cross S
Page 104 and 105: Spillway Concrete Repair Works Plan
Page 106 and 107: Scale: Job No.: Drawing No.: Plan V
Page 108 and 109:
Cross Section of the Rubber Dam Dra
Page 110 and 111:
Scale: Job No.: Drawing No.: Plan V
Page 112 and 113:
Page 114 and 115:
Brunswick PERMIT FOR WATERCOURSE AN
Page 116:
DOCUMENT "A" Attached to ALT 31667'
show all

Environmental Impact Assessment(EIA) Registration for the ...

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?