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ESIA 1279 Ruiru II Dam Report

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ESIA 1279 Ruiru II Dam Report ATHI WATER SERVICES BOARD RUIRU II DAM WATER SUPPLY PROJECT ENVIRONMENT AND SOCIAL IMPACT ASSESSMENT STUDY REPORT JULY 2016 Environmental Safeguards Consultants (ESC) Limited Page | 1 If you have to print, we suggest you use, for economic and ecological reasons, double‐sided printas much as possible. Page | 2 TABLE OF CONTENTS ACRONYMS AND ABBREVIATIONS ..................................................................................7 EXECUTIVE SUMMARY ........................................................................................................9 Project Background............................................................................................................................ 9 Project Need and Justification............................................................................................................ 9 The ESIA Study and Objective .......................................................................................................... 9 Project Description and Components................................................................................................. 9 Project Cost...................................................................................................................................... 11 ESIA Approach and Methodology................................................................................................... 11 Public Consultation, Participation and Disclosure........................................................................... 12 Policy, Legal and Administrative Framework ................................................................................. 12 Project Impacts................................................................................................................................. 12 Anticipated Positive Impacts (Socio-Economic).............................................................................. 12 Adverse Project Impacts and Mitigation Measures (Biophysical and Socio-Economic)................. 13 Cumulative Effect Assessment (CEA)............................................................................................. 18 Induced Impacts ............................................................................................................................... 19 Socio-Economic Adverse Impacts and Mitigation Measures .......................................................... 19 Dam Safety....................................................................................................................................... 21 Environmental and Social Management Plan .................................................................................. 23 Conclusion ....................................................................................................................................... 23 1 INTRODUCTION............................................................................................................25 1.1 Background and Context ................................................................................................... 25 1.2 The Project......................................................................................................................... 25 1.3 ESIA Terms of Reference................................................................................................... 26 1.4 ESIA Objectives.................................................................................................................. 27 1.4.1 The Approach.................................................................................................................. 28 1.4.2 Scoping Process .............................................................................................................. 28 1.4.3 Documentary Review ...................................................................................................... 28 1.4.4 Field Assessment............................................................................................................. 29 1.4.5 Detailed ESIA Study Activities ........................................................................................ 29 1.4.6 Public and Stakeholder Consultations ............................................................................ 30 1.5 Format and Content of the Report ................................................................................... 31 1.6 ESIA Study Team................................................................................................................ 31 2 PROJECT DESCRITION.................................................................................................32 2.1 Background Information..................................................................................................... 32 2.2 Project Overview............................................................................................................... 33 2.2.1 Components of Ruiru II Water Supply Project................................................................ 33 2.3 Project Location................................................................................................................. 34 2.4 Project Justification............................................................................................................. 37 2.5 Dam Description................................................................................................................ 38 2.5.1 Overview ......................................................................................................................... 38 2.5.2 Hydrological Design ....................................................................................................... 38 2.5.3 Geological and Geotechnical Dam Design..................................................................... 39 2.5.4 Sourcing of Materials – Earthwork Hauling................................................................... 39 2.5.5 Main Annexes and Building Description......................................................................... 39 2.6 Raw Water Transfer .......................................................................................................... 42 2.7 Water Treatment Plant...................................................................................................... 42 2.8 Treated Water Transfer and Reservoirs ........................................................................... 43 2.9 Project Implementation Schedule ...................................................................................... 44 2.10 Project Cost Estimate ...................................................................................................... 45 Page | 3 3 POLICY LEGAL AND INSTITUTIONAL FRAMEWORK ..........................................46 3.1 Context .............................................................................................................................. 46 3.2 Governance and Administrative Structure ........................................................................ 46 3.2.1 Ministry of Environment, Natural Resources and Regional Development Authorities... 47 3.2.2 Ministry of Water and Irrigation..................................................................................... 47 3.2.3 National Environment Management Authority ............................................................... 47 3.2.4 Water Resources Management Authority........................................................................ 47 3.2.5 Water Services Regulatory Board (WASREB) ................................................................ 47 3.2.6 Water Services Trust Fund (WSTF) ................................................................................ 47 3.2.7 Water Services Boards .................................................................................................... 48 3.2.8 Water Services Providers................................................................................................ 48 3.2.9 Other Government Agencies ........................................................................................... 48 3.3 IFC Performance Standards ............................................................................................... 56 3.4 World Bank Safeguard Policies .......................................................................................... 59 3.4.1 OP/BP 4.01 (Environmental Assessment)....................................................................... 59 3.4.2 OP/BP 4.04 (Natural Habitats)....................................................................................... 61 3.4.3 OP/BP 4.11 (Physical Cultural Resources) .................................................................... 61 3.4.4 OP/BP 4.12 (Involuntary Resettlement).......................................................................... 62 3.4.5 OP/BP 4.36 (Forests)...................................................................................................... 62 3.4.6 OP/BP 4.10 (Indigenous Peoples) .................................................................................. 62 3.4.7 OP/BP 4.09 (Pests Management).................................................................................... 63 3.4.8 Activities Triggering World Bank Safeguards................................................................. 63 OP/BP 4.09 (Pests Control Management) ................................................................................... 64 OP/BP 4.37 (Safety of Dams).....................................................................................................
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