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Environmental and Socio-Economic Impact Assessment

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Environmental and Socio-Economic Impact Assessment Public Disclosure Authorized Public Disclosure Authorized Public Disclosure Authorized Public Disclosure Authorized V7 E2248 Supplementary Environmental and Social Impact Assessment (SESIA) Trung Son Hydropower Project Prepared by: Integrated Environments (2006) Ltd. Prepared for: Trung Son Project Management Board (TSHPMB) September 2009 Table of Contents EXECUTIVE SUMMARY.......................................................................................................... 21 1. INTRODUCTION............................................................................................................... 32 1.1 Project Overview and the SESIA................................................................................ 32 1.1.1 Key Project Features........................................................................................... 32 1.1.2 Purpose of the SESIA ......................................................................................... 32 1.1.3 Key SESIA Features ........................................................................................... 32 1.1.4 Previous Environmental Assessment Documentation ......................................... 33 1.2 Impact Assessment Methodology............................................................................... 33 1.2.1 Impact Criteria..................................................................................................... 34 1.2.2 Impact Rankings ................................................................................................. 34 2 | Page 1.3 Project Regulatory and Legal Framework................................................................... 35 1.3.1 Vietnamese Legislation ....................................................................................... 35 1.3.2 Other Applicable Environmental Policy and Standards........................................ 36 1.4 Previous Environmental and Social Plans and Reports.............................................. 39 2. PROJECT DESCRIPTION................................................................................................ 42 2.1 General Overview ...................................................................................................... 42 2.2 Project Location ......................................................................................................... 42 2.3 Project Area ............................................................................................................... 43 2.4 Project Scope............................................................................................................. 46 2.5 Auxiliary Components ................................................................................................ 48 2.5.1 Co Luong to Co Me Access Road ....................................................................... 49 2.5.2 Construction Site Roads...................................................................................... 49 2.5.3 Construction Camps............................................................................................ 50 2.5.4 Water Supply System.......................................................................................... 51 2.5.5 Construction Materials......................................................................................... 51 2.5.6 Transport of Equipment and Materials to the Project Site.................................... 52 2.6 Construction Schedule ............................................................................................... 52 2.7 Manpower Utilization.................................................................................................. 54 2.8 Reservoir Operation ................................................................................................... 54 2.8.1 Flood Control ...................................................................................................... 54 2.8.2 Electricity Production........................................................................................... 56 3. ANALYSIS OF ALTERNATIVES ...................................................................................... 58 3.1 Without the Project..................................................................................................... 58 3.2 Technical Alternatives with the Project ....................................................................... 58 3.2.1 Altering the Direction of Construction/Power lines............................................... 58 3.2.2 Altering the Full Supply Level.............................................................................. 59 3.2.3 Altering the Installed Capacity and Flood Control Procedures............................. 59 4. ENVIRONMENTAL BASELINE ........................................................................................ 62 4.1 Air Quality and Noise.................................................................................................. 62 4.1.1 Air Quality ........................................................................................................... 62 4.1.2 Noise................................................................................................................... 62 4.2 Climate....................................................................................................................... 63 4.2.1 Temperature ....................................................................................................... 64 3 | Page 4.2.2 Rainfall................................................................................................................ 64 4.2.3 Wind.................................................................................................................... 65 4.2.4 Humidity.............................................................................................................. 66 4.2.5 Evaporation......................................................................................................... 66 4.3 Hydrology................................................................................................................... 66 4.3.1 General Description ............................................................................................ 66 4.3.2 Annual Flow ........................................................................................................ 67 4.3.3 Flood Season...................................................................................................... 69 4.3.4 Sediment Transport............................................................................................. 70 4.3.5 Water Quality ...................................................................................................... 71 4.3.6 Aquifers............................................................................................................... 74 4.4 Geology and Soils ...................................................................................................... 74 4.4.1 Bedrock Geology................................................................................................. 74 4.4.2 Lithology ............................................................................................................. 74 4.4.3 Tectonics............................................................................................................. 75 4.4.4 Quarries .............................................................................................................. 75 4.4.5 Hydrogeology...................................................................................................... 76 4.4.6 Soil...................................................................................................................... 76 4.4.7 Soil Erosion......................................................................................................... 77 4.5 Terrestrial Ecology ..................................................................................................... 78 4.5.1 Flora.................................................................................................................... 78 4.5.2 Fauna.................................................................................................................. 81 4.5.3 Listed Species..................................................................................................... 82 4.6 Aquatic Ecology ......................................................................................................... 82 4.6.1 River Description and Aquatic Habitat................................................................. 82 4.6.2 Aquatic Biodiversity............................................................................................. 86 4.6.3 Listed Aquatic Fauna Species............................................................................. 86 4.6.4 Other Aquatic Fauna ........................................................................................... 86 4.6.5 Reproduction and Migration ................................................................................ 88 4.6.6 Aquaculture Production....................................................................................... 88 4.7 Protected Areas and Biodiversity ............................................................................... 91 4.7.1 Xuan Nha Natural Reserve ................................................................................. 94 4.7.2 Pu Hu Natural Reserve ....................................................................................
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