Oil and Natural Gas Corporation Limited
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OIL AND NATURAL GAS CORPORATION LIMITED Environmental Impact Assessment (EIA) Report for Development Drilling of Wells in Onshore ML Areas of Jorhat and Golaghat Districts, Assam State Asian Consulting Engineers Private Limited, New Delhi JANUARY 2016 Environmental Impact Assessment (EIA) Report for Development Drilling of Wells in Onshore ML areas of Jorhat and Golaghat Districts, Assam TABLE OF CONTENTS EXECUTIVE SUMMARY……………………………………………………………………………….... viii-xix CHAPTER-1: INTRODUCTION 1.1 BACKGROUND …………………………………………………………………………………......... 1-1 1.1.1 Project Objectives and Benefits…………………………………………………………........ 1-2 1.1.2 Project Proponent ……………………………………………………………………….........1 -2 1.1.3 EIA Consultant ………………………………………………………………………….........1 -2 1.2 DESCRIPTION OF ML AREAS OF JORHAT AND GOLAGHAT DISTRICTS ………………....... 1-3 1.3 LEGAL AND OTHER REQUIREMENTS …………………..……………………………………...... 1-3 1.4 SCOPE OF THE EIA STUDY ……………………………………………………….…………….......1 -4 1.5 APPROACH & METHODOLOGY OF EIA STUDY ……………………………………………........1 -6 1.5.1 Approach of the EIA Study ……………………………………...……………………….......1 -6 1.5.2 Establishment of Baseline Environmental Status …………………..……………………...... 1-6 1.5.3 Field Study/Monitoring for Generation of Primary Data ……………………………….........1 -7 1.5.4 Environmental Impact Assessment ………………………………………………………......1 -7 1.6 STRUCTURE OF THE REPORT ………………………………………………………………….......1 -13 CHAPTER-2: PROJECT DESCRIPTION 2.1 KEY BLOCK INFORMATION ……………………………………………………………………..... 2-1 2.2 PROJECT OBJECTIVES ………………………………………………………………………............2 -1 2.3 PROJECT LOCATION……………………………………………………………………………........2 -2 2.4 PRIOR TO DRILLING…………………………………………….. ……………………………......... 2-7 2.4.1 Site Survey…………….…………….…………….……………………………………......... 2-7 2.4.2 Road and Site Construction………………………………………..…………..……...............2 -8 2.5 DRILLING OPERATION …………..…………..……………...............................................................2 -8 2.5.1 Components of Drilling Rig …………………………………………………………….........2 -9 2.5.2 Well Construction………………………………………………………………………......... 2-12 2.5.3 Drilling Fluids……………………………………………………………………………....... 2-13 2.5.4 Cementing Program………………………………………………………………………...... 2-16 2.5.5 Well Evaluation………………………………………………………………………….........2 -16 2.5.6 Completion of Drilling……………………………………………………………………......2 -17 2.5.7 Rig Demobilization………………………………………………………………………....... 2-17 2.5.8 Restoration and Rehabilitation……………………………………………………………......2 -17 2.6 COLLECTION AND TRANSPORTATION OF PRODUCED OIL AND GAS…………………........2 -18 2.7 STAFFING…………………………………………………………………………………………....... 2-28 2.8 RESOURCE REQUIREMENT……………………………………………………………………........2 -28 2.8.1 Power Consumption and Fuel……………………………………………………………....... 2-28 2.8.2 Water Requirement………………………………………………………………………........2 -29 2.8.3 Chemicals…………………………………………………………………………………...... 2-30 2.9 NOISE, AIR EMISSIONS, EFFLUENTS AND SOLID WASTE GENERATION………………....... 2-30 2.9.1 Noise………………………………………………………………………………………......2 -30 2.9.2 Air Emissions……………………………………………………………………………........ 2-30 2.9.3 Effluents and Solid Wastes………………………………………………………………........2 -31 CHAPTER-3: DESCRIPTION OF THE ENVIRONMENT 3.1 INTRODUCTION …………………………………………..……………………………………......... 3-1 3.2 SITE DESCRIPTION AND ITS ENVIRONS ……………………………………………………........3 -1 3.3 REGIONAL SETTING ……….……………………………………………………………………...... 3-3 3.3.1 Topography, Geology & Stratigraphy…………………...........................................................3 -3 3.3.3 Seismicity ……….……………………………………………………....................................3 -3 3.4 STATE OF THE ENVIRONMENT……………………………………………………………….........3 -4 3.4.1 Climate……………………………………………………………………………………...... 3-4 3.4.2 Micro-Meteorology ……………...……………………………………………………….......3 -6 3.4.3 Land Use Land Cover.…………………………………………………………….…............ 3-8 3.4.4 Forest Land………………………………………………………………………………........3 -14 Asian Consulting Engineers Pvt. Ltd. i Environmental Impact Assessment (EIA) Report for Development Drilling of Wells in Onshore ML areas of Jorhat and Golaghat Districts, Assam 3.4.5 Soil Characteristics ……………………………………………………………………...........3 -15 3.4.5.1 Methodology........................................................................................................... 3-15 3.4.5.2 Monitoring Results..................................................................................................3 -18 3.4.6 Water Environment …………………………………………………………………….......... 3-19 3.4.6.1 Water Quality Assessment & Methodology........................................................... 3-21 3.4.6.2 Monitoring Results..................................................................................................3 -24 3.4.7 Air Environment....……………………………………………………………………............3 -27 3.4.7.1 Parameters, Frequency and Monitoring Methodology............................................3 -29 3.4.7.2 Ambient air quality in the study area...................................................................... 3-30 3.4.8 Noise Environment …………………………………………………………………...............3 -32 3.4.8.1 Ambient Noise Monitoring..................................................................................... 3-32 3.4.8.2 Methodology........................................................................................................... 3-35 3.4.8.3 Analysis of the Data................................................................................................ 3-37 3.4.9 Biological Environment………………………………………………………………............ 3-37 3.4.9.1 Terrestrial Environment.......................................................................................... 3-38 3.4.10 Socio-Economic Environment.................................................................................................. 3-50 3.4.10.1 Demography............................................................................................................3 -52 3.4.10.2 Occupation.............................................................................................................. 3-54 3.4.10.3 Medical Facilities.................................................................................................... 3-54 3.4.10.4 Fire Services............................................................................................................3 -54 3.4.10.5 Connectivity............................................................................................................ 3-54 3.4.10.6 Environmental Concern.......................................................................................... 3-55 3.4.10.7 Corporate Social Responsibility..............................................................................3 -55 CHAPTER-4: ANTICIPATED ENVIRONMENTAL IMPACTS & MITIGATION MEASURES 4.1 ASSESSMENT OF IMPACT ON THE ENVIRONMENT……….…….………….………………......4 -1 4.2 IDENTIFICATION OF INTERACTIONS…………………………………………………………...... 4-1 4.3 POTENTIAL IMPACTS AND MITIGATION MEASURES……….……………….……...................4 -2 4.3.1 Air Environment ….………….………….………….………….………….……….................4 -3 4.3.1.1 Impacts................................................................................................................... 4-3 4.3.1.2 The Model.............................................................................................................. 4-3 4.3.1.3 Model Input............................................................................................................ 4-4 4.3.1.4 Modeling Procedure............................................................................................... 4-4 4.3.1.5 Modeling Results....................................................................................................4 -4 4.3.1.6 Discussion on Modeling Results............................................................................ 4-30 4.3.1.7 Mitigation Measures...............................................................................................4 -30 4.3.2 Noise and Vibration….. …….………….………….………….………….……..…................ 4-30 4.3.2.1 Impacts................................................................................................................... 4-31 4.3.2.2 Mitigation Measures...............................................................................................4 -32 4.3.3 Water Environment…….….………….………….………….……………..……..………...... 4-32 4.3.3.1 Impacts................................................................................................................... 4-32 4.3.3.2 Mitigation Measures...............................................................................................4 -33 4.2.4 Land Environment.....................................................................................................................4 -33 4.3.4.1 Impacts................................................................................................................... 4-33 4.3.4.2 Mitigation Measures...............................................................................................4 -34 4.2.5 Biological Environment ……….……………..……..……..……..…….................................. 4-34 4.2.6 Socio Economic Environment...................................................................................................4 -35 4.3.6.1 Impacts................................................................................................................... 4-35 4.3.6.2 Mitigation Measures...............................................................................................4 -35 CHAPTER-5: ENVIRONMENTAL MONITORING PROGRAM 5.1 INTRODUCTION