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).....................................................................................................