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REVISED PROJECT DESCRIPTION AND ENVIRONMENTAL IMPACT ASSESSMENT (EIA) REGISTRATION FOR THE NEPISIGUIT FALLS GENERATING STATION MODIFICATION AND REHABILITATION PROJECT 1.2 PURPOSE/RATIONALE/NEED FOR THE PROJECT A study commissioned in 1998 by Smurfit–Stone to characterize the integrity of the NFGS recommended refurbishment and maintenance to bring the NFGS up to modern day standards and address known deficiencies. The refurbishment of the NFGS is being undertaken in a phased approach. The first phase was undertaken in 2000, and consisted of replacing the main dam and sluiceway with a rubber dam and a new submerged gate. The purpose of the Project is to undertake the second phase of the refurbishment and maintenance, which has been planned for the NFGS since 1998. This phase includes the refurbishment of the forebay spillway dam and the installation of a new 1.2 m (3.9 ft) diameter, 85.3 m (280 ft) long rubber dam and various associated and other refurbishment works. Prior to NB Power’s purchase of the NFGS in 2007, the forebay spillway dam had an additional 1.2 m of hold back capacity from the use of wooden flashboards (Photo 1, Appendix B, which shows the forebay dewatered for construction of phase I). These flashboards did not allow for the required response to flood levels and ice jams in the winter months, and were therefore removed for 5 to 6 months of the year. This practice reduced the water capacity of the forebay, and thus lowered the service level and generating potential of the NFGS. The flashboards had to be removed manually during flooding and ice jams, which presented health and safety concerns. NB Power permanently removed the flashboards due to safety concerns. Undertaking modification and rehabilitation activities on the forebay spillway dam structure, which is in poor repair (Photo 2, Appendix B), will increase its lifespan. Replacing the flashboard system with a rubber dam will reinstate the full operating potential of the NFGS by holding back water and restoring the generating capacity of the station to what it was prior to removal of the flashboards. This will increase efficiency in operation, and improve flood control. The Project includes the replacement of the existing coarse trash rack system, which was damaged in December 2010 by high water levels and ice (further discussed in Section 2.2.7), although the primary cause was the cumulative effect of deterioration and corrosion, resulting in failure of the coarse trash rack system. The coarse trash racks protect the power house components by entraining debris that would otherwise run through the systems and cause damage to various mechanical components. The coarse trash racks also provide structural support to the intake deck on the forebay side of the power house. The NFGS is an important part of NB Power’s generation portfolio, as it represents dependable, renewable energy on a continuous basis that offsets the use of fossil fuels. Page 2 June 15, 2011
± PROJECT SITE LOCATION New Brunswick PEI Maine USA Nova Scotia File Path: V:\1218\active\Projects_Stantec\1218\121810326\Mapping\MXD\ReportFigures\FIG1_PROJECT LOCATION.mxd REFERENCE DRAWING: SURVEYS AND MAPPING BRANCH DEPT. OF ENERGY, MINES AND RESOURCES PROJECT LOCATION NOTE: THIS DRAWING ILLUSTRATES SUPPORTING INFORMATION SPECIFIC TO A STANTEC PROJECT AND SHOULD NOT BE USED FOR OTHER PURPOSES. 0 0.5 1 1.5 Km PROJECT LOCATION NEPISIGUIT FALLS GENERATING STATION UPGRADES BATHURST MINES GLOUCESTER COUNTY, NEW BRUNSWICK Scale: 1:40,000 Date (yyyy/mm/dd): Fig. By: Job No.: 121810326 Appd. By: Fig. No.: 1.1 1 Client: NEW BRUNSWICK POWER GENERATION CORPORATION 2010/11/20 RJS JB Stantec Consulting Ltd. © 2010 Map: Double Stereographic
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REVISED PROJECT DESCRIPTION AND ENV
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View of the Spillway Dam Showing Wo
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Client: New Brunswick Power Corpora
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Client: New Brunswick Power Corpora
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Scale: Job No.: Figure No.: Cross S
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Spillway Concrete Repair Works Plan
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Cross Section of the Rubber Dam Dra
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Brunswick PERMIT FOR WATERCOURSE AN
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DOCUMENT "A" Attached to ALT 31667'
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