Final Report
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FINAL REPORT ENVIRONMENTAL REPORT ENERDU POWER SYSTEM INC. ENERDU GS EXPANSION & REDEVELOPMENT PROJECT OE8982-00 December 2012 Submitted to: Enerdu Power Systems Inc. Submitted by: OEL-HydroSys, a division of BluMetric Environmental Inc. 3108 Carp Road, Box 430 Ottawa, Ontario K0A 1L0 ENVIRONMENTAL REPORT ENERDU POWER SYSTEMS INC. ENERDU GS EXPANSION & REDEVELOPMENT PROJECT Submitted to: ENERDU POWER SYSTEMS INC. Submitted by: OEL-HydroSys, a division of BluMetric Environmental Inc. 3108 Carp Road, Box 430 Ottawa, ON K0A 1L0 File No. OE8982 December 2012 Ref: OE8982-00 20121211 Enerdu FINAL Environmental Report.docx Enerdu GS Expansion and Redevelopment Environmental Report EXECUTIVE SUMMARY Enerdu Power Systems Inc. (herein referred to as Enerdu, or the proponent) is proposing the expansion and redevelopment of its existing hydroelectric facility, the Enerdu Generation Station (GS). The Enerdu GS is located on the Mississippi River in the Town of Mississippi Mills (Almonte), Ontario, at 11 Main Street, in the northeastern part of the Mississippi River watershed. The proposed project would involve the construction of an expanded powerhouse and the redevelopment of the weir to increase the present generation capacity from 300 kW to approximately 950 kW. The environmental assessment (EA) for the proposed project has been completed in order to recognize and assess the potential consequences of the project early in the planning cycle. The EA process allowed the proponent to make informed decisions during the selection, siting, planning and design of the project to address identified issues. The following report summarizes the environmental assessment of the proposed undertaking and includes a description of the proposed project, a study of existing conditions, an assessment of the project’s potential impacts and a description of the proposed mitigation measures. Throughout the EA process, the proponent and project team assessed the potential impacts through appropriate biological, hydrologic and archaeological studies, and developed measures for mitigating potential impacts in consultation with government agencies, stakeholders and aboriginal communities. In response to public concern over the potential impacts of the proposed project on the aesthetics of the surrounding area, Enerdu is proposing to build the new weir in the footprint of the existing weir and to align the proposed powerhouse with the existing powerhouse building. Additionally, the façade and dimensions of the powerhouse will be designed to complement the aesthetic and heritage value of the old mill building. Recognizing the importance of cultural events in the Town of Mississippi Mills, the proponent will liaise with the Mississippi Mills Chamber of Commerce and event organizers to develop a construction schedule that will minimize disturbances to the extent possible during such events. In recognition of the spiritual and cultural importance of the American eel to the Algonquin community, the proponent will adopt a management strategy for providing safe upstream and downstream passage of American eel and contributing to the recovery of the species in the Ottawa River watershed. The framework of this management strategy will be developed and agreed upon with both the Ministry of Natural Resources and representatives of the Algonquins of Ontario. Operations at the Enerdu GS will continue to adhere to the best management range outlined in the Mississippi River Water Management Plan. An Administrative Amendment or Minor Amendment to the plan would be required to reflect the increased generating capacity of the facility. The Enerdu GS will continue to operate as a run-of-river facility, and will not result in a Page i Enerdu GS Expansion and Redevelopment Environmental Report change in water levels (from currently established practices) either upstream or downstream of the site. Numerous management strategies for mitigating potential negative impacts associated with the proposed development, and a list of commitments to be implemented throughout the project life cycle are outlined in this report. It was determined that with the implementation of the proposed management measures, the proposed expansion and redevelopment of the Enerdu GS would not result in significant adverse effects on the biophysical, socioeconomic and cultural environment. Additionally, the proposed project is expected to have several positive outcomes to the local, regional and provincial economy, and will contribute to Ontario’s Green Energy initiative. Page ii Enerdu GS Expansion and Redevelopment Environmental Report TABLE OF CONTENTS 1.0 INTRODUCTION ............................................................................................................. 1 2.0 ENVIRONMENTAL ASSESSMENT METHODOLOGY........................................................ 4 2.1 Overview of Environmental Assessment ....................................................................... 5 2.2 Task Description ........................................................................................................... 6 2.3 Agency Review ............................................................................................................ 12 2.4 Public Review .............................................................................................................. 12 3.0 PROJECT DESCRIPTION ................................................................................................. 13 3.1 Description of the Hydroelectric Facility ...................................................................... 13 3.1.1 Project Components ................................................................................................ 14 3.1.2 Ancillary works ........................................................................................................ 17 3.1.3 Operating Strategies ................................................................................................ 18 3.1.4 Existing Operating Regime ....................................................................................... 18 3.1.5 Proposed Facility Operating Regime ........................................................................ 19 3.2 Construction and Scheduling ....................................................................................... 20 4.0 ENVIRONMENTAL EFFECTS ......................................................................................... 20 4.1 Initial Assessment ........................................................................................................ 20 5.0 EXISTING CONDITIONS ................................................................................................ 21 5.1 Location ...................................................................................................................... 21 5.2 Topography ............................................................................................................... 22 5.3 Climate ....................................................................................................................... 22 5.4 Soils ............................................................................................................................ 22 5.5 Geology ..................................................................................................................... 23 5.6 Hydrogeology ............................................................................................................ 23 5.7 River Hydrology ......................................................................................................... 24 5.7.1 Surface Water Quality ............................................................................................ 24 5.7.2 Water Supply ......................................................................................................... 25 5.7.3 Navigation ............................................................................................................. 26 5.8 Ecology ...................................................................................................................... 26 5.8.1 Terrestrial Habitat and Species ................................................................................ 28 5.8.2 Aquatic Habitat and Species .................................................................................... 28 Page iii Enerdu GS Expansion and Redevelopment Environmental Report 5.8.3 Species at Risk......................................................................................................... 30 5.9 Human Activities ........................................................................................................ 32 5.9.1 Historical ................................................................................................................ 32 5.9.2 Archaeology ........................................................................................................... 32 5.9.3 Current Land and Water Use .................................................................................. 32 5.9.4 Aboriginal Land and Water Use .............................................................................. 35 6.0 CONSULTATION ........................................................................................................... 36 6.1 Departmental and Agency Consultation ...................................................................... 36 6.1.1 Federal ..................................................................................................................