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1. Introduction VIETNAM ELECTRICITY TRUNGSON HYDROPOWER MANAGEMENT BOARD Public Disclosure Authorized Supplementary Environmental and Social Impact Assessment (SESIA) Trung Son Hydropower Project Public Disclosure Authorized Public Disclosure Authorized Public Disclosure Authorized Ha Noi, January 15, 2011 Supplementary Environmental and Social Impact Assessment Table of Contents EXECUTIVE SUMMARY .......................................................................................................... 20 1. INTRODUCTION ............................................................................................................... 56 1.1 Project Overview and the SESIA ................................................................................ 56 1.1.1 Key Project Features ........................................................................................... 56 1.1.2 Purpose of the SESIA .......................................................................................... 56 1.1.3 Key SESIA Features ............................................................................................ 57 1.1.4 Previous Environmental Assessment Documentation .......................................... 57 1.2 Impact Assessment Methodology ............................................................................... 60 1.2.1 Impact Criteria ..................................................................................................... 60 1.2.2 Impact Rankings .................................................................................................. 60 1.3 Project Regulatory and Legal Framework ................................................................... 62 1.3.1 Vietnamese Legislation ........................................................................................ 62 1.3.2 Other Applicable Environmental Policy and Standards ........................................ 63 1.4 Previous Environmental and Social Plans and Reports .............................................. 66 2. PROJECT DESCRIPTION ................................................................................................ 69 2.1 General Overview ....................................................................................................... 69 2.2 Project Location .......................................................................................................... 69 2.3 Project Area ................................................................................................................ 70 2.4 Project Scope ............................................................................................................. 73 2.5 Auxiliary Components ................................................................................................. 75 2.5.1 Co Luong to Co Me Access Road ........................................................................ 75 2.5.2 Construction Site Roads ...................................................................................... 76 2.5.3 Construction Camps ............................................................................................ 77 2.5.4 Water Supply System .......................................................................................... 78 2.5.5 Construction Materials ......................................................................................... 78 2.5.6 Transport of Equipment and Materials to the Project Site .................................... 79 2.6 Construction Schedule ................................................................................................ 79 2.7 Manpower Utilization .................................................................................................. 80 2.8 Reservoir Operation .................................................................................................... 81 2.8.1 Flood Control ....................................................................................................... 81 2.8.2 Electricity Production ........................................................................................... 84 3. ANALYSIS OF ALTERNATIVES ...................................................................................... 87 3.1 Without the Project ..................................................................................................... 87 3.2 Technical Alternatives with the Project ........................................................................ 87 2 Supplementary Environmental and Social Impact Assessment 3.2.1 Altering the Direction of Construction/Power lines ............................................... 87 3.2.2 Altering the Full Supply Level .............................................................................. 88 3.2.3 Altering the Installed Capacity and Flood Control Procedures ............................. 88 4. ENVIRONMENTAL BASELINE ......................................................................................... 91 4.1 Air Quality and Noise .................................................................................................. 91 4.1.1 Air Quality ............................................................................................................ 91 4.1.2 Noise ................................................................................................................... 91 4.2 Climate ....................................................................................................................... 92 4.2.1 Temperature ........................................................................................................ 93 4.2.2 Rainfall ................................................................................................................ 93 4.2.3 Wind .................................................................................................................... 94 4.2.4 Humidity .............................................................................................................. 95 4.2.5 Evaporation ......................................................................................................... 95 4.3 Hydrology ................................................................................................................... 95 4.3.1 General Description ............................................................................................. 95 4.3.2 Annual Flow ......................................................................................................... 96 4.3.3 Flood Season ...................................................................................................... 98 4.3.4 Sediment Transport ............................................................................................. 99 4.3.5 Water Quality ..................................................................................................... 100 4.3.6 Aquifers ............................................................................................................. 102 4.4 Geology and Soils..................................................................................................... 103 4.4.1 Bedrock Geology ............................................................................................... 103 4.4.2 Lithology ............................................................................................................ 103 4.4.3 Tectonics ........................................................................................................... 103 4.4.4 Construction materials ....................................................................................... 104 4.4.5 Hydrogeology .................................................................................................... 104 4.4.6 Soil .................................................................................................................... 104 4.4.7 Soil Erosion ....................................................................................................... 105 4.5 Terrestrial Ecology .................................................................................................... 106 4.5.1 Flora .................................................................................................................. 106 4.5.2 Fauna ................................................................................................................ 108 4.5.3 Listed Species ................................................................................................... 109 4.6 Aquatic Ecology ........................................................................................................ 110 4.6.1 River Description and Aquatic Habitat ............................................................... 110 4.6.2 Aquatic Biodiversity ........................................................................................... 112 4.6.3 Listed Aquatic Fauna Species ........................................................................... 112 4.6.4 Other Aquatic Flora and Fauna .......................................................................... 112 3 Supplementary Environmental and Social Impact Assessment 4.6.5 Reproduction and Migration ............................................................................... 114 4.6.6 Aquaculture Production ..................................................................................... 114 4.7 Protected Areas and Biodiversity .............................................................................. 116 4.7.1 Xuan Nha Natural
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