OIL AND NATURAL GAS CORPORATION LIMITED - Pollution ...

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

JANUARY 2016

Asian Consulting Engineers Private Limited, New Delhi

Environmental Impact Assessment (EIA) Report for Development Drilling of Wells in Onshore ML areas of Jorhat and Golaghat Districts, Assam

Asian Consulting Engineers Pvt. Ltd. i

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


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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


4.3.3 Water Environment…….….………….………….………….……………..……..………...... 4-32

4.3.3.1 Impacts................................................................................................................... 4-32


4.2.4 Land Environment..................................................................................................................... 4-33

4.3.4.1 Impacts................................................................................................................... 4-33


4.2.5 Biological Environment ……….……………..……..……..……..…….................................. 4-34

4.2.6 Socio Economic Environment................................................................................................... 4-35

4.3.6.1 Impacts................................................................................................................... 4-35


CHAPTER-5: ENVIRONMENTAL MONITORING PROGRAM

5.1 INTRODUCTION …………………………………………………….…….………….…………........ 5-1

CHAPTER-6: ADDITIONAL STUDIES

6.1 INTRODUCTION ………………………………………………………..……………….……............ 6-1

6.2 RISK ASSESSMENT …………………………………………..……………….…………………....... 6-1

6.2.1 Methodology……………………………………………………………………………......... 6-2


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6.2.2 Identification of Hazards in Drilling and Production Testing Operations………………........ 6-3

6.2.2.1 Minor Oil Spill....................................................................................................... 6-3

6.2.2.2 Major Oil Spill....................................................................................................... 6-4

6.2.2.3 Blowout.................................................................................................................. 6-4

6.2.2.4 Hydrogen Sulphide (H2S)...................................................................................... 6-4

6.2.2.5 Natural Disaster and Hazards................................................................................. 6-5

6.2.3 Development Drilling in ML areas of Jorhat and Golaghat Districts……………................... 6-6

6.2.4 QRA Approach……….………….…………………………………….................................... 6-7

6.2.4.1 Damage due to Explosion...................................................................................... 6-8

6.2.4.2 Thermal Incidents/ Fire in Storage Area................................................................ 6-8

6.2.5 Mitigation Measures ……………….….…………………………………………………....... 6-9

6.2.5.1 Control Measures for Major Hazards..................................................................... 6-9

6.2.5.2 Control Measures for H2S Leakage/Emission during Drilling.............................. 6-10

6.2.5.3 Natural Disaster and Hazards................................................................................ 6-11

6.2.5.4 Fire Fighting Facility............................................................................................. 6-11

6.2.6 Occupational Health………………………………………………………………………...... 6-12

6.2.7 Frequency of Occurrence of Accident Scenario....................................................................... 6-13

6.2.8 Conclusion………………………………………………………………………………........ 6-14

6.3 DISASTER MANAGEMENT PLAN ……………………………………………………………........ 6-14

6.3.1 Statuary Requirements……………………………………………………………………...... 6-15

6.3.2 Nature of Emergencies……………………………………………………………………...... 6-15

6.3.3 Onsite Emergency Operations……………………………………………………………....... 6-16

6.3.3.1 Functions & Responsibilities of Various Coordinators......................................... 6-17

6.3.3.2 Emergency Control Room (ECR) at Base office................................................... 6-18

6.3.3.3 Responding to an Emergency................................................................................ 6-19

6.3.4 Offsite Emergency Plan…………………………………………………………………. 6-23

6.3.4.1 Assessment of Hazard leading to Off-Site Emergency.......................................... 6-23

6.3.4.2 Disaster due to Man-made causes (Terrorist attack).............................................. 6-24

6.3.4.3 Action Plan - Reporting of an Off-Site Emergency............................................... 6-27

6.3.4.4 Mock Drill for Onsite and Off-Site Emergency Management............................... 6-29

6.3.4.5 Review of the Plan................................................................................................. 6-30

6.3.4.6 Blow Out Contingency Plan.................................................................................. 6-30

CHAPTER-7: PROJECT BENEFITS

7.1 PROJECT BENEFITS ……………………………………………………………................................. 7-1

CHAPTER-8: ENVIRONMENTAL MANAGEMENT PLAN

8.1 INTRODUCTION…………………………………………………………………………………........ 8-1

8.2 PURPOSE AND OBJECTIVES OF THE ENVIRONMENTAL MANAGEMENT PLAN.………...... 8-1

8.2.1 HSE Policy of Block Operator…………………………………………………………......... 8-1

8.2.2 Organizational Structure and Responsibilities……………………………………………...... 8-2

8.3 MITIGATION PLAN………………………………………………………………………………....... 8-3

8.4 ENVIRONMENTAL TRAINING ……………………………………………….................................. 8-12

8.5 WASTE MANAGEMENT PLAN …………………………………….…………………………......... 8-12

8.6 RESTORATION AND REHABILITATION………………………………………………………...... 8-17

8.7 OCCUPATIONAL HEALTH AND SAFETY MANAGEMENT PLAN…………………………....... 8-21

8.8 CAPITAL AND RECURRING COST FOR POLLUTION CONTROL MEASURES.……................. 8-22

CHAPTER-9: SUMMARY AND CONCLUSION

9.1 SUMMARY AND CONCLUSION ………………………………………………………………........ 9-1

CHAPTER 10: DISCLOSURE OF CONSULTANTS ENGAGED

10.1 INTRODUCTION …………………………………………………………………………………....... 10-1

10.2 QUALITY OF SERVICES …………………………………….…………………………………........ 10-1

10.3 AREA OF SPECIALIZATION …………………………………………………………….………...... 10-1

10.4 RESOURCES …………………………………………………………………………….………......... 10-2


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LIST OF ANNEXURES

ANNEXURE - I Copy of Approved ToR, Form - 1 and PFR

ANNEXURE - II Copy of Existing EC, CTO and Compliance Report

ANNEXURE - III Environmental and Safety related Policies

ANNEXURE - IV Corporate Environmental Policy

ANNEXURE - V CSR’s details (for the period of 2013-14 to 2014-15)

LIST OF TABLES

Table No. Title Page

No.

Table 1.1 Applicable Acts and Guidelines ……………………………………………………….......... 1-3

Table 1.2 TOR Compliance Status for Development Drilling in Golaghat and Jorhat Districts,

Assam……………............................................................................................................... 1-8

Table 2.1 Co-ordinates of the ML Blocks…………………………………………………………...... 2-2

Table 2.2 Co-ordinates of the Drilling Locations…………………………………………………......... 2-3

Table 2.3 Ingredients of Water Based Drilling Fluid ………………………………………………...... 2-13

Table 2.4 Ingredients of Water Based Drilling Mud………………………………………………........ 2-14

Table 2.5 Special Additives and their Function in Water Based Drilling Fluids……………………..... 2-14

Table 2.6 Collection and Transportation of Produced Oil and Gas…………………………………..... 2-18

Table 2.7 Water Utilization Per Well………………………………………………………………....... 2-29

Table 3.1 Climate Data for the Study Area…………………………………………………………...... 3-6

Table 3.2 Landuse Distribution of the Study Area……………………………………………………... 3-11

Table 3.3 Important Features within 1 Km Radius of Drilling Locations…………………………........ 3-13

Table 3.4 Soil Sampling Locations…………………………………………………………………...... 3-16

Table 3.5 Results of Soil Analysis…………………………………………………………………...... 3-18

Table 3.6 ML Blocks and their Categorization as per Central Ground Water Authority (CGWA)…..... 3-21

Table 3.7 Water Sampling Locations………………………………………………………………....... 3-21

Table 3.8 Ground Water Quality Analytical Results………………………………………………….... 3-24

Table 3.9 Surface Water Quality Analytical Results………………………………………………….... 3-25

Table 3.10 Location Details for Ambient Air Quality Monitoring…………………………………….... 3-26

Table 3.11 Method of Analysis for Different Air Quality Parameters………………………………....... 3-28

Table 3.12 Summary of PM10 Levels Monitored in the Study Area…………………………………...... 3-30

Table 3.13 Summary of SO2 Levels Monitored in the Study Area…………………………………........ 3-30

Table 3.14 Summary of NOX Levels Monitored in the Study Area…………………………………....... 3-31

Table 3.15 Summary of VOC Levels in the Study Area……………………………………………........ 3-31

Table 3.16 Summary of HC Levels in the Study Area………………………………………………....... 3-32

Table 3.17 Location of Noise Monitoring Stations…………………………………………………........ 3-32

Table 3.18 Summary of Ambient Noise levels monitored in the study area…………………………...... 3-36

Table 3.19 List of Important Flora in the Golaghat Study Area……………………………………….... 3-38

Table 3.20 List of Important Flora in the Jorhat Study Area…………………………………………..... 3-40

Table 3.21 List of Important Medicinal Plant in the Jorhat Study Area……………………………….... 3-43

Table 3.22 List of Important Fauna in the Golaghat Study Area………………………………………... 3-45

Table 3.23 List of Important Fauna in the Jorhat Study Area………………………………………….... 3-47

Table 3.24 Administrative Divisions of the Districts…………………………………………………..... 3-50

Table 3.25 Demographic Details of the Jorhat Study Area…………………………………………….... 3-52

Table 3.26 Demographic Details of the Golaghat Study Area…………………………………………... 3-52

Table 3.27 Available Medical Facilities in and around Study Area…………………………………....... 3-54

Table 4.1 Interactions between Project Activities and Environmental Parameters ………………......... 4-2

Table 4.2 Stack & Emission Characteristics……………………………………………………............ 4-4

Table 4.3 Predicted 24-hourly Maximum GLCs for air pollutants ……………………......................... 4-5

Table 4.4 Occupational and Human Exposure Levels ……………………………………………........ 4-31

Table 5.1 Recommended Environmental Monitoring Protocol – Pre Drilling Phase………………...... 5-2

Table 5.2 Recommended Environmental Monitoring Protocol – During Drilling Phase…………..... 5-2

Table 5.3 Recommended Environmental Monitoring Protocol – Post Drilling……………………....... 5-4

Table 6.1 Symptoms of H2S as per Concentrations………………………………………………......... 6-5

Table 6.2 Co-ordinates of the ML Areas………………………………………………………….......... 6-6

Table 6.3 Bulk Hazardous Chemical Storage facility at Drilling Site (tentative)…………………........ 6-7


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LIST OF TABLES

Table No. Title Page

No.

Table 6.4 Risk Classification………………………………………………………………………........ 6-7

Table 6.5 Damage due to Overpressure……………………………………………………………....... 6-8

Table 6.6 Possible Major Scenarios………………………………………………………………......... 6-9

Table 6.7 Fire Extinguishers Distribution…………………………………………………………........ 6-12

Table 6.8 Occupational Health hazards and mitigating measures…………………………………........ 6-13

Table 6.9 Frequency occurrence for various accidents scenarios…………………………………........ 6-14

Table 6.10 Existing GGS stations within the ML Areas……………………………………………........ 6-15

Table 6.11 Shut in Procedure while Drilling…………………………………………………………...... 6-22

Table 6.12 Shut in Procedure while Tripping………………………………………………………........ 6-23

Table 8.1 EMP - Mitigation Management Matrix (Prior to Drilling Phase) ………………………....... 8-4

Table 8.2 EMP - Mitigation Management Matrix (During Drilling Phase) ………………………........ 8-5

Table 8.3 Waste Management Plan ……………………………………………………………............. 8-13

Table 8.4 Capital and Recurring Cost for Pollution Control Measures................................................... 8-22

LIST OF FIGURES

Figure No. Title Page

No.

Figure 1.1 Project Location Map……………………………………...……....................................... 1-1

Figure 2.1 Project Location of Nambar, Khoraghat and Khoraghat ML areas..................................... 2-4

Figure 2.2 Project Location of East Lakhibari and Borholla ML areas................................................ 2-5

Figure 2.3 Field Geography of Hydrocarbon Reserve Areas……………………………………….... 2-6

Figure 2.4 Field Geography of Jorhat………………………………………………………………... 2-6

Figure 2.5 Approximate Road Distance Map………………………………………………………... 2-7

Figure 2.6 Layout of Drilling Site with Facilities…………………………………………………..... 2-9

Figure 2.7 The Anatomy of Drilling Rig…………………………………………………………...... 2-10

Figure 2.8 Typical On-Shore Drilling Rig………………………………………………………….... 2-12

Figure 2.9 Typical Drill Fluid Circulation System…………………………………………………... 2-15

Figure 2.10 Layout Map of Borholla GGS…………………………………………………………..... 2-20

Figure 2.11 (a) Process Flow Diagram of Borholla GGS………………………………………………..... 2-21

Figure 2.11 (b) Schematic Diagram of Borholla GGS Process Flow…………………………………....... 2-22

Figure 2.12 (a) Layout Map of Khoraghat GGS-1……………………………………………………....... 2-23

Figure 2.12 (b) Schematic Diagram of Khoraghat GGS-1 Facility Layout……………………………...... 2-24

Figure 2.13 Process Flow Diagram of Khoraghat GGS-1…………………………………………...... 2-25

Figure 2.14 Layout Map of Nambar GGS-1…………………………………………………………... 2-26

Figure 2.15 Process Flow Diagram of Nambar GGS-1……………………………………………...... 2-27

Figure 2.16 Well Flow Line Route of Borholla GGS………………………………………………..... 2-28

Figure 2.17 Water Balance Diagram………………………………………………………………....... 2-30

Figure 2.18 Flow Chart of Effluent Treatment Plant (ETP)…………………………………………... 2-33

Figure 3.1 Location of ML areas…………………………………………………………………….. 3-2

Figure 3.2 Map showing Seismic Zones of India…………………………………………………..... 3-4

Figure 3.3 Monthly rainfall variations for Golaghat district (10 years data)……………………….... 3-5

Figure 3.4 Monthly rainfall variations for Jorhat district (10 years data)…………………………..... 3-5

Figure 3.5 Historical rainfall data for Golaghat and Jorhat Districts……………………………….... 3-6

Figure 3.6 Wind rose diagram for Golaghat district (Oct to Dec 2015)……………………………... 3-7

Figure 3.7 Wind rose diagram for Jorhat district (Oct to Dec 2015)……………………………….... 3-8

Figure 3.8 LULC study of Borholla ML area………………………………………………………... 3-9

Figure 3.9 LULC study of Nambar, Khoraghat and Khoraghat Extension ML area……………….... 3-10

Figure 3.10 LULC study of East Lakhibari ML area………………………………………………...... 3-11

Figure 3.11 Distance of Wildlife Sanctuaries and National Parks from the project area……………... 3-15

Figure 3.12 Triangular classification of soil…………………………………………………………... 3-16

Figure 3.13 Soil Sampling Location Map…………………………………………………………....... 3-17

Figure 3.14 Drainage Map of Study Area…………………………………………………………….. 3-19

Figure 3.15 Surface Water Sampling Location Map………………………………………………..... 3-21

Figure 3.16 Ground Water Sampling Location Map………………………………………………...... 3-22

Figure 3.17 Ambient Air Quality Monitoring Location Map………………………………………..... 3-27

Figure 3.18 Ambient Noise Quality Monitoring Location Map……………………………………..... 3-34

Figure 3.19 Ambient Noise Levels Monitored in the Study Area (Day time) ………………………... 3-37


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LIST OF FIGURES

Figure No. Title Page

No.

Figure 3.20 Ambient Noise Levels Monitored in the Study Area (Night time) …………………….... 3-37

Figure 3.21 Villages found within the Study Area…………………………………………………..... 3-51

Figure 4.1 Methodology for Environmental Impact Assessment…………………………………..... 4-1

Figure 4.2 Isopleths plot of concentration for PM10 (μg/m3) at Different ML Blocks Location…...... 4-6

Figure 4.3 Isopleths plot of concentration for SO2 (μg/m3) at Different ML Blocks Location…….... 4-12

Figure 4.4 Isopleths plot of concentration for NOX (μg/m3) at Different ML Blocks Location…....... 4-18

Figure 4.5 Isopleths Plot of Concentration for HC (μg/m3) at Different ML Blocks Location…….... 4-24

Figure 6.1 Onsite-Emergency Organization………………………………………………………..... 6-17

Figure 6.2 Flow chart for Offsite Emergency Management………………………………………..... 6-28

Figure 6.3 Blowout Contingency Plan……………………………………………………………...... 6-31

LIST OF PHOTOPLATE

Photo plate No. Title Page

No.

Photo plate 3.1 Project Area......................................................................................................................... 3-14

Photo plate 3.2 Collection of Soil Samples.................................................................................................. 3-18

Photo plate 3.3 Collection of Surface Water Samples................................................................................. 3-22

Photo plate 3.4 Collection of Ground Water Samples………………………………………..................... 3-23

Photo plate 3.5 Ambient air quality monitoring………………………………......................................... 3-29

Photo plate 3.6 Noise level Monitoring at Different Locations in Study Area………………………….... 3-35

Photo plate 3.7 Local Vegetations and Surroundings of the Study Area ……………………………........ 3-45

Photo plate 3.8 Public consultations conducted at different locations in Study Area ……………............. 3-55

LIST OF ACRONYMS AND ABBREVIATIONS

ACE Asian Consulting Engineers

API American Petroleum Institute

BOD Biochemical Oxygen Demand

BOP Blow out Preventers

CEC Chief Executive Coordinator

COD Chemical Oxygen Demand

CGWA Central Ground Water Authority

CPCB Central Pollution Control Board

CSR Corporate Social Responsibility

CWC Central Water Commission

DG Diesel Generators

DGMS Directorate General of Mines Safety

DMP Disaster Management Plan

DSA Drill Site Accommodation

ECR Emergency Control Room

EIA Environmental Impact Assessment

EMP Environmental Management Plan

EP Lube Extreme Pressure Lube

ERP Emergency Response Plan

FICCI Federation of Indian Chambers of Commerce and Industry

GDP Gross Domestic Product

GGS Group Gathering Stations

GSI Geological Survey of India

GSM Grams per Square Meter

GWRE Groundwater Resource Estimation

HC Hydrocarbon

HSD High Speed Diesel

HSE Health, Safety and Environment

IS Indian Standard

kl Kilo Litre


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kld Kilo Litre Per Day

LNG Liquefied Natural Gas

ML Mining Lease

MMTOE Million Metric Tonne

MoEF Ministry of Environment and Forest

MTOE Million Tonnes of Oil Equivalent

NAAQS National Ambient Air Quality Standards

NIDM National Institute of Disaster Management

NRSC National Remote Sensing Centre

OISD Oil Industry Safety Directorate

OMR Oil Mines Regulation

ONGC Oil and Natural Gas Corporation Limited

OSC On-Scene Commander/Coordinate

OSHA Occupational Safety and Health Act

PM Particulate Matter

PPM Parts Per Million

QRA Quantitative Risk Assessment

SOP Standard (Safe) Operating Procedures

SPCB State Pollution Control Board

STEL Short Term Exposure Limit

TDS Total Dissolved Solids

TSS Total Suspended Solids

TWA Time Weighted Average

VOC Volatile Organic Compound

WBM Water Based Mud

EEXXEECCUUTTIIVVEE

SSUUMMMMAARRYY


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EXECUTIVE SUMMARY

1. INTRODUCTION

Project Highlights

Oil & Natural Gas Corporation Limited (ONGC), a premier Govt. of India Undertaking and

the major National Oil Company with Maharatna Status, is a vertically integrated company

producing crude oil, natural gas and value added products like LPG, NGL, Petrol, HSD etc.

Operations of ONGC extend over both onshore as well as offshore within India and outside

India.

ONGC has proposed Eight (08) Development Drilling Locations in Nambar, East Lakhibari,

Khoraghat and Khoraghat Extension Mining lease areas in the Golaghat district and Four (04)

Development Drilling Locations in Borholla Mining lease area in the Jorhat district of Assam

State. The total ML area of Jorhat district and Golaghat district is 32.116 sq. km. and 120.5

sq. km. respectively. The Total Project Cost is INR 240.00 Crores.

Objective and Scope of EIA study

The Objective of EIA study is to meet the regulatory environmental clearance criteria as well

as to ascertain a sustainable development through the assessment of likely impacts due to

project related activities on the surrounding environment. The study envisages likely

assessment of negative impacts and alleviation of these negative impacts, to such extent that it

avoids/mitigates any harm/ permanent changes in the naturally existing environment.

The scope of the EIA study includes detailed characterization of the existing status of the

terrestrial and socio-economic environment within the study area, identification of the

potential environmental impacts of the project, and formulation of an effective Environmental

Management Plan (EMP) to prevent, control & mitigate the adverse environmental impacts,

and ensuring the environmental compliance. Apart from suggesting mitigation measures to

the negative impacts, the report suggests implementation of various positive and enhancement

measures as a part of project benefit program to people of the nearby areas. This report is

based on the TOR approved by Ministry of Environment and Forests, Government of India

vide letter- J-11011/49/2014-IA II (I) dated 18th December, 2014.

2. PROJECT DESCRIPTION

ONGC intends to drill about 12 Developmental Wells in Five ML areas of Golaghat District

and Jorhat District of Assam State. The salient features of the project have been summarized

in the following table:

Name of the Project : Development Drilling in Jorhat and Golaghat districts

Location : Jorhat and Golaghat districts, Assam

Total Area of the

Project

Jorhat District:

Borholla ML area

-

32.116 km2

Golaghat District:

Nambar ML area

East Lakhibari ML area

Khoraghat ML area

-

-

-

26 km2

8.5 km2

3 km2


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Khoraghat Extension ML area

Total

-

-

83 km2

120.5 km2

Number of Proposed

Wells

: Total 12 wells (4 wells in Jorhat and 8 wells in

Golaghat District)

Jorhat District:

Borholla ML area

-

4 wells

Golaghat District:

Nambar ML area


Khoraghat and Khoraghat

Extension ML area

-

-

-

4 wells

1 well

3 wells

Total Estimated Drilling

Period for each Well

upto 45 days for shallower wells (depth upto 2500 m)

2 to 3 months for Deeper wells (depth > 2500 m).

Proposed Drilling Fluid

for each well

Water-based Mud System

Type of Hydrocarbon

Expected

: Oil and Gas

Estimated Cost of the

Project

: INR 240 Crores

3. DESCRIPTION OF THE ENVIRONMENT

The study area comprises of the Nambar ML area, East Lakhibari ML area, Khoraghat ML

area and Khoraghat Extension ML area and Borholla ML area with an area of 32.116 sq. km.

and 120.5 sq. km. The existing/ baseline environmental set-up of the Study Area has been

studied during the months of October 2015 to December 2015 as described in following sub-

headings.

Geology & Topography

The Golaghat and Jorhat Districts are located on younger and older alluvial plains of

Brahmaputra valley. The two districts lie in the Upper Brahmaputra Valley (NAEB). Due to

the extreme geostatic pressures exerted on the landmass during the creation of the Himalayas

have resulted in Assam having large areas of sedimentary deposits leading to formation of

huge oil reserves. The two districts has significant oil and gas reserves. The oil and gas in

Upper Assam till 1980s was found in the Barail Group of Upper Eocene to Lower Oligocene

age and the Tipam Group of Upper Miocene age. However during the last decade oil and gas

accumulations have been discovered within the Langpar and Lakadong formations of

Paleocene to Lower Eocene age. In the Khoraghat and Nambar fields situated in southeastern

part of the Dhansiri Valley, oil occurs in the Bokabil Formation (Middle Miocene) which is

not developed towards north in the Brahmaputra valley. In the Borholla oil field, oil occurs in

fractured granitic basement rock of Precambrian age (DGH India, 2010).

Seismic Consideration

According to seismic-zoning map of India [IS 1893: 2002], the study region falls in Zone V

of the seismic zones of India.


Asian Consulting Engineers Pvt. Ltd. x

Climate and Meteorology

The Golaghat and Jorhat District lies in the Hot sub-humid (moist) to humid (inclusion of per-

humid) eco-regions (NRSC & CWC, 2014). The climate is dominated by the subtropical

monsoon which is normally active from April to October with occasional winter showers. At

times approach of monsoon is also marked by cyclones in April and May. The plains get

flooded. Autumn and winter are dry seasons.

The yearly rainfall for Golaghat district varied from minimum 1232 mm to maximum 1871

mm with an average rainfall of 1450 mm. The yearly rainfall for Jorhat district varied from

minimum 1380 mm to maximum 2112 mm with an average rainfall of 1755 mm.

The temperature varies from 03oC to 37oC and 04oC to 37oC (October to December) in

Golaghat and Jorhat Districts respectively.

Land Use

The Land Use Land Cover (LULC) within the block have been studied and it can be broadly

classified into seven major categories, namely, settlements, fallow land, agricultural land,

vegetation cover, open land, sand bar and river. The land use distribution of the study area is

given below in Table 1.

Table 1: Land Use Distribution of the Study Area

Sl.

No.

Landuse

Category

Borholla ML

area

Khoraghat ML,

Khoraghat-ext. ML

and Nambar ML area

East Lakhibari

ML area

Area

km2

% Area km2 %

Area

km2

%

1 Settlement 1.75 5 12.95 12 1.91 22

2 Agricultural Land 9.43 29 0 - 1.24 15

3 Vegetation Cover 16.12 50 20.6 18 2.23 26

4 Fallow Land 4.82 15 0 - 1.21 14

5 Open Land 0 - 70.5 63 1.92 23

6 Sand Bar 0 - 2.4 2 0 -

7 River 0 - 5.57 5 0 -

Total 32.1 100 112.0 100 8.51 100

Soil Quality

Five soil samples were collected from different places within the study area. The sampling

and analysis of soil were carried out as per standards of IS: 2720. It was observed from the

analyzed data that the soil of the study area is Loamy Sand to Clay in nature. The average

value of pH is 6.58, it denotes that the soil is neutral in nature. The soil has brownish

appearance and possess good amount of the nutrient elements nitrogen, phosphorus and

potassium.

Water Quality

Nine water samples were collected from ground and surface water bodies in the Study Area.

Four surface water samples were collected from different places within the Study Area. Five


Asian Consulting Engineers Pvt. Ltd. xi

ground water samples were collected from representative places within the study area. The

sampling and analysis of water were carried out as per Standard Methods of Water and

Wastewater Analysis (APHA). The result of water samples is compared with IS: 10500-2012

drinking water standard to assess their suitability for drinking purpose.

Ground Water: It is observed from the analyzed data that the content of Iron in ground water

samples is higher (varied between 1.5 to 2.2 mg/l) than the desirable limits of IS: 10500:2012,

because of naturally high level, which is also reported by the CGWB. The pH of the samples

was in the range of 6.9 to 8.2, which is within the prescribed drinking water (DW) limit.

Electrical conductivity values varied in a wide range of 296μs/cm to 418μs/cm indicating the

presence of considerable amount of ionic matter in ground water. The phenolic compounds,

Oil & Grease, Mercury and Biochemical Oxygen Demand (BOD) content are found below

detection limit in all ground water samples. The other parameters have been found to be

within the limits as per standards.

Surface Water: The pH of the surface water samples was found little alkaline in nature, it

ranges between 7.9 to 8.5. Total hardness and Alkalinity were found in the range of 106 to

132 mg/l and 115 to 1164 mg/l, respectively, which were also within the DW limit. Phenolic

compounds, Oil & Grease and Mercury content of all samples are below detection limit.

Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD) and Chemical Oxygen

Demand (COD) were in the range of 5.2 to 7.6 mg/l, 13 and 23 mg/l and 3.0 to 5.0 mg/l,

respectively. The other parameters have been found to be within the limits as per standards.

Analytical results indicate the absence of pollution in these water sources both industrial and

domestic pollution. This is also evident from the surrounding land use land cover, which is

deviated from anthropogenic activities in the surrounding areas.

Air Quality

Air quality was monitored at Eight different locations within the study area. The 24-hourly

average of PM10 levels varied station wise between 39.7 µg/m3 to 64.4 µg/m3. The 24-hourly

average values of SO2 varied between 3.92 µg/m3 to 6.78 µg/m3. The 24-hourly average NO2

level measured in the study area ranged between 9.24 µg/m3 and 16.53 µg/m3. The analytical

result of value reveals that the concentrations of PM10, SO2 and NOx were found within the

prescribed standard limits at all the monitoring locations. VOC and HC (methane and non-

methane) was also monitored. VOC was found below dateable limit. The average values of

Methane and Non-Methane varied between 0.79 µg/m3 to 2.1 µg/m3 and 0.23 µg/m3 to 1.0

µg/m3 respectively.

Noise Quality

Ambient noise intensity at Eight locations within the study area has been collected. Noise

monitoring was carried out on a 24-hour basis to assess the baseline noise-levels and to

evaluate the impact. The values of noise level, which were recorded, was in the range of 41.5

- 67.8 dB (A) during daytime and 30.0 – 59.8 dB (A) during nighttime

Biological Characteristics

There are no eco-sensitive areas or forest or wild life sanctuaries within the 10 km of the

study area. The nearest Wildlife Sanctuary is the Nambor Wildlife Sanctuary from the


Asian Consulting Engineers Pvt. Ltd. xii

boundary of East Lakhibari ML areas at a distance of 10.5 km. Other sensitive areas are at a

distance greater than 25 km.

The floristic composition of the Golaghat and Jorhat district is very rich; most of the plants

are tropical evergreen and semi-evergreen variety. Secondary data obtained from the Forest

department was evaluated to assess the floristic structure of the study area. Major tree species

found in the area are Sida, Dimaru, aam, segun, Nahar, bel etc. Common wild fauna are

Swamp Deer, Butterflies, Honeybee, Great Indian Hornbill, Bengal Florican, White

wing Wood Duck, etc.

Socio-Economic Environment

The Nambar, Khoraghat, Khoraghat Extension and East Lakhibari ML areas in Golaghat

district cover approximately 67 villages and the Borholla ML area in Jorhat district cover

around 20 villages as per Census 2011. The demographic profile of the study area is given in

Table 2 and Table 3.

Table 2: Demographic Details of the Study Area in Jorhat District

Sl.

No.

Name of

Villages

Total no. of

Households

Population Literates

Male Female Total Male Female Total

Borholla ML Area

1. Rajabari Panjan 363 944 833 1777 636 447 1083

2. Gaharichowa 276 708 670 1378 520 421 941

3. Kaliapani T.E. 99 229 227 456 159 138 297

4. Cherelipather 344 802 774 1576 585 461 1046

5. Khemakachari 359 794 745 1539 690 623 1313

6. Borholla T.E. 821 1927 1811 3738 1098 764 1862

7. Garjan Gaon 327 803 785 1588 589 479 1068

8. Sildubi 328 800 802 1602 526 463 989

9. No.2 Kakadonga

Habi 448 1042 1016 2058 850 763 1613

10. Borholla Grant 280 689 637 1326 544 427 971

11. No.1 Kakadonga

Habi Gaon 325 797 801 1598 678 605 1283

12. Matikhula Gaon 143 359 337 696 291 243 534

13. Miri Gaon 351 846 813 1659 693 574 1267

14. No,1 Block 385 948 862 1810 755 581 1336

15. No.2 Block 278 669 643 1312 550 487 1037

16. No.3 Block 543 1338 1270 2608 1090 910 2000

17. Halfmile Bell 551 1435 1332 2767 1161 929 2090

18. No.4 Block 357 867 817 1684 721 573 1294

19. Nagabal Gaon 218 523 518 1041 392 332 724

20. Sukanjun 328 788 780 1568 668 617 1285

(Source: Census of India, 2011)


Asian Consulting Engineers Pvt. Ltd. xiii

Table 3: Demographic Details of the Study Area in Golaghat District

Sl.

No. Name of Villages

Total no. of

Households



Khoraghat & Nambar ML Area

1. Ajharguri No.2 51 137 117 254 83 60 143

2. Kathonipur 26 56 55 111 44 31 75

3. Madhupur No.1 58 186 151 337 134 95 229

4. Madhupur No.2 364 1066 1021 2087 408 333 741

5. Kamalpur 33 75 75 150 61 52 113

6. Ranipukhuri 98 263 209 472 127 69 196

7. Rajapukhuri 95 226 218 444 157 139 296

8. Chetonapur 77 185 188 373 102 82 184

9. Lakhinagar No.1 136 299 349 648 239 188 427

10. Lakhinagar No.2 79 163 189 352 133 108 241

11. Bidyapur 363 1145 1052 2197 650 484 1134

12. Janakpur 39 96 96 192 77 64 141

13 Hatidubi 176 439 434 873 257 222 479

14 Navajyoti

Majgaon 75 185 168 353 144 120 264

15 Misamari 13 20 28 48 12 14 26

16 Bordondi No.1 28 71 58 129 53 36 89

17 Bordondi No.2 85 221 216 437 158 116 274

18 Goroibil 47 108 124 232 72 60 132

19 Dhonpur No.2 0 0 0 0 0 0 0

20 Tamulpur 37 92 100 192 75 70 145

21 Lotapur 43 106 97 203 70 51 121

22 Haldhibari 183 490 387 877 314 185 499

23 Jordolong No.1 41 97 105 202 69 56 125

24 Dimorujan 85 189 179 368 143 97 240

25 Jurpukhuri 33 74 89 163 54 48 102

26 Benganabari 51 138 126 264 92 69 161

27 Da-Kawalipathar

No.1 75 165 158 323 122 88 210

28 Da-Kawalipathar

No.2 30 63 53 116 43 29 72

29 Jordolong No.2 52 132 111 243 106 74 180

30 Jahajibosti 45 132 129 261 65 53 118

31 Gholapani 114 235 216 451 144 121 265

32 Lachit Gaon No.2 190 533 518 1051 380 301 681

33 Lachit Gaon No.1 80 220 194 414 162 104 266

34 Bilgaon 151 346 353 699 253 230 483

35 Santipur No.2 46 108 109 217 82 63 145


Asian Consulting Engineers Pvt. Ltd. xiv

Sl.


Total no. of

Households



36 Majgaon 117 293 268 561 174 125 299

37 Chetiagaon No.1 205 667 492 1159 468 249 717

38 Chetiagaon No.2 98 250 220 470 153 92 245

39 Kempur 53 168 154 322 87 59 146

40 Krishnapur 265 804 773 1577 416 294 710

41 Chainpur 201 567 516 1083 312 202 514

42 Ratanpur 88 237 253 490 107 83 190

43 Jordolong No.1 62 138 149 287 111 92 203

44 Jordolong No.2 32 96 107 203 73 61 134

45 Santipur 106 286 275 561 174 129 303

46 Sonalinagar No.1 28 67 65 132 57 39 96

47 Sonalinagar No.2 174 417 409 826 313 245 558

48 Thaigirguri 74 168 167 335 119 104 223

49 Owabari 50 101 94 195 81 67 148

50 Ranipukhuri 135 317 294 611 232 195 427

51 Milonpur 26 60 53 113 41 32 73

52 Chaluk Pathar

No.1 212 592 565 1157 419 331 750

53 Chaluk Pathar

No.2 99 240 244 484 159 113 272

54 Chaluk Pathar

No.3 214 642 613 1255 340 276 616

55 Rangmaipur 61 126 122 248 98 69 167

56 Rajapukhuri No.2 56 159 159 318 119 83 202

57 Rajapukhuri No.3 176 535 551 1086 276 222 498

58 Rajapukhuri No.1 60 175 162 337 106 62 168

59 Gouri Pathar 26 64 49 113 54 41 95

60 Kuki Bosti 94 246 253 499 190 183 373

61 Aao Bosti 55 127 140 267 86 87 173

62 Tengatol Bosti 28 84 84 168 63 36 99

63 Nepali Bosti 53 140 124 264 104 66 170

64 Pukhuri Para 119 317 309 626 241 220 461

65 Tokse Naga Bosti 0 0 0 0 0 0 0

East Lakhibari ML Area

66 Ghiladhari 981 2337 2324 4661 2457 1411 1046

67 Merapani 717 1914 1604 3518 1546 1200 2746


4. ANTICIPATED ENVIRONMENT IMPACTS AND MITIGATION MEASURES

The proposed project of Developmental Drilling includes the following activities:

Site preparation (clearance of land, earthing, digging, etc)

Drilling Operations (deployment of rigs, etc)

Atmospheric emissions (gas flaring, vehicular emissions, etc)


Asian Consulting Engineers Pvt. Ltd. xv

Operational discharges

Noise levels

Solid/Wastewater/Hazardous waste generation

Use of resources such as water requirement during land clearing activities etc & other

operations (drilling, etc) and fuel for D.G sets for power generation

Transport of personnel and materials

Fuel storage and handling

Based upon the aspect impact interaction and baseline information, the following impacts are

anticipated for which suitable mitigation measures have been proposed.

Air Environment

The site preparation activities (such as clearance of land, etc), operation of generators and

other machineries & equipments, gas flaring activities, transportation of materials &

personnel, and fugitive emissions have the impact on air quality. However, the impacts during

the drilling shall be temporary, restricted to the construction site and adoption of suitable

measures (such as routine maintenance of the vehicles/machineries, etc); whereas impacts

during the drilling operation phase shall be minimized by adopting good maintenance

practices and suitable measures such as adequate stack height, special flare tip design for

effective combustion etc.

Noise Quality

The main sources of noise generation during the construction and operation phase are:

Site preparation activities (earth work, digging, etc)

Operation of machineries and equipments (such as generators, compressors, fluid

pumps, mud pumps, etc)

Movement of vehicles

These activities may affect the surrounding social and ecological environment. However,

impacts due to these activities have been envisaged to be local and temporary in drilling phase

and also, adopting suitable measures such as routine maintenance of vehicles/machineries, use

of noise attenuation devices, shall minimize the impacts during drilling and operation phase.

Water Quality

The water quality is likely to get affected due to operational & domestic discharges and

accidental spillage of lubricants, oil & other chemicals from the operation of rigs and other

equipments & machineries. However, these impacts shall be mitigated by formulation of

waste management plan, wherein wastewater generated from during drilling and operation

activities shall be subjected to suitable treatment (such as mobile ETP) prior to its final

disposal.

Soil Quality

The quality of soil is likely to get affected due to accidental spillage of lubricants & other

chemicals, operational discharges, site preparation activities (such as removal of top soil due

to land clearance, etc) wastewater discharges, and deployment of rigs, etc. However impacts


Asian Consulting Engineers Pvt. Ltd. xvi

shall be mitigated by adoption of suitable measures and implementation of waste management

plan.

Biological Environment

The impacts on flora and fauna may occur due to site preparation activities (land clearance,

etc), gas flaring activities, movement of vehicles, noise generation from machineries &

equipments, operational discharges and accidental spillage of oil, lubricants and other

chemicals during drilling and operation phase. However, these impacts shall be local and

minimized by adopting suitable measures (such as adequate flare tip design, use of noise

attenuation devices, waste management plan etc).

Socio-Economic Environment

The near by human settlement is likely to get affected due to proposed activities (such as

movement of vehicles, operation of generators, compressors and other machineries &

equipments, gas flaring activities, etc) during drilling and operation phase. However, these

adoptions of suitable mitigation measures such as use of PPEs, implementation of waste

management plan etc shall minimize the occupational health hazards and impacts on local

community, thereby contributing to the net positive impacts on socio-economic environment.

The proposed activities will generate indirect employment opportunities in the region. The

proposed project will also result in the implementation of social welfare project as per

Company’s CSR policy and improvement in existing infrastructure facilities (such as roads,

etc).

5. ENVIRONMENT MONITORING PROGRAM

An Environmental Monitoring Program is suggested to monitor environmental parameters

during the proposed activities. The Monitoring program is given in the following sections.

Pre Drilling Phase

Air Quality: Once prior to drilling, monitor the NOX, SO2, PM10 VOCs and HC parameters at

drilling site.

Surface Water Quality: The analysis of pH, Total Suspended Solids, Total Dissolved Solids,

BOD, COD, O&G, and heavy metals (Zinc, lead, iron, nickel, cadmium and chromium) are to

be monitored where water up to 1 Km radius from drilling site, once prior to drilling.

Noise Quality: Monitor the background noise levels at the drilling site, once prior to drilling.

Clearing of tress (if existing): Inventory of tress will be carried out prior to drilling operation.

During Drilling Phase

Natural Resources: Daily monitor the quantity of each type of material (including water

consumption) and fuel used at drilling site during drilling operation phase.

Air Quality: Monitor the NOX, SO2, PM10 VOCs and HC parameters at drilling site, once in a

six month.


Asian Consulting Engineers Pvt. Ltd. xvii


BOD, COD, O&G, and heavy metals (Zinc, lead, iron, nickel, cadmium and chromium) are to

be monitored where water up to 1 Km radius from drilling site, once in season.

Noise Quality: Monitor the noise level and maintenance of machineries at the project site,

once during the drilling at drilling site.

Drilling Waste: During the drilling operation phase, monitor and record the generation of

waste quantity on daily basis at drilling site; whereas quantification, characterization of drill

cuttings and its safe disposal as per G.S.R. 546 (E), dated 30/08/05.

Post Drilling Phase

Drilling Waste: At the end of the drilling operation, the quantification, characterization of

drill cuttings and its safe disposal as per G.S.R. 546 (E), dated 30/08/05.


BOD, COD, O&G, and heavy metals (Zinc, lead, iron, nickel, cadmium and chromium) at the

same location where pre and during drilling phase monitoring was done. Once after the

closing of drilled well.

Compensatory tree plantation: If tree cutting is involved during drilling phase, Survival rate

of tree saplings was carried out once in every three years at tree plantation locations.

6. ADDITIONAL STUDIES

Risk Assessment

ONGC is committed to maintain high standards for health and safety at all times. However,

on rare occasions, an unplanned event can have the potential to jeopardize the safety of the

crew and cause environmental damage. Potential non-routine events that may occur during

the proposed activities drilling activities:

Blowout

Oil Spills

H2S Emissions

Gas leakage

Fire (if gas comes in contact with source of ignition)

Occupational Hazards

Specific procedures and training will be carried out to ensure that the correct action would be

taken in the event of unplanned occurring. The drill site will be equipped with suitable safety

measures such as fire fighting facility (fire suit, fire extinguisher, gas sensors etc), medical

facilities, etc. The operating personnel will be provided PPEs and trained for such an

eventuality and the key responsible people will be required to hold relevant well control

certifications.

Disaster Management Plan and Emergency Response Plan

The Disaster Management Plan (DMP) and Emergency Response Plan (ERP) also includes in

this chapter. The objectives of DMP and ERP are to:


Asian Consulting Engineers Pvt. Ltd. xviii

Obtain an early warning of emergency conditions so as to prevent a negative impact on

personnel, the environment and assets.

Immediate response to emergency with effective communication and organized

procedures.

Safeguard personnel to prevent injuries or loss of life by either protecting personnel from

the hazard or evacuating them from the facilities.

Minimize the impact of such an event on the environment and the facilities by mitigating

the potential for escalation and, where possible, containing the release.

The following key elements of DMP and ERP are:

Contingency plan

Accident prevention procedures/measures

Accident/emergency response planning procedures

Onsite and offsite crisis management, communication, contact information etc.

7. PROJECT BENEFITS

The project will enhance reliable hydrocarbon supplies, which will bring economic benefits

and provide indirect employment opportunities to the local people and also benefit the area by

way of improvement in existing infrastructure.

8. ENVIRONMENT MANAGEMENT PLAN

Site-specific Environment Management Plans (EMP) has been developed to prevent and

mitigate significant adverse impacts and to accentuate beneficial impacts which shall be

implemented by ONGC for the proposed project. The relevant mitigation measures are

proposed for the following environment issues.

Rig Mobilization

Wastewater and Effluent Management

Fuels, Lubricants and Chemicals

Non-routine events and accidental releases (Well kicks, blow out)

Air emissions

Noise and Vibration

Solid wastes (hazardous and non-hazardous waste)

Soil quality

Ecological Impacts

Socio-economic impacts

To facilitate field level implementation, a waste management plan is framed which will be

subjected to fine tuning depending on site conditions. Appropriate measures and engineering

practices will be taken as per established standards and requirements such as adequate stack

height, effluent discharge as per CPCB standards, installation of generators set as per notified

norms by MoEF, installation of HSD Tanks, fire protection system and occupational health

safety program as per OISD Standards etc. Socio-economic welfare plan shall also be

implemented as per company’s CSR policy.

Environmental training is also an essential part, which will help to ensure that the

requirements of the EMP are clearly understood and followed by all project personnel

throughout the project period for operations.


Asian Consulting Engineers Pvt. Ltd. xix

9. SUMMARY AND CONCLUSION

ONGC had proposed Developmental Drilling of 12 wells in Five ML areas of Golaghat

(Nambar, East Lakhibari, Khoraghat and Khoraghat Extension ML areas) and Jorhat

(Borholla ML area) Districts of Assam State.

This EIA study has been conducted for identification of impacts based on the analyzed data

(collection from primary and secondary sources) and mitigation measures for minimizing any

environmental impact due to the project operations has been suggested. Impacts due to

operation of machineries and equipments, operational discharges, accidental spillage of

lubricants, oil and other chemicals, movement of vehicles, gas flaring activities, etc during

drilling and operational phase may affect the surrounding environment. However, all these

impacts shall be minimized by adopting suitable measures, suggested in Environment

Management Plan (EMP). As a result of the control measures and management processes in

place, there should be no significant impact resulting from the proposed operations.

In general, this project will bring economic benefits, increase energy security of the country

and generate employment opportunities.

10. DISCLOSURE OF CONSULTANTS ENGAGED

Asian Consulting Engineers Pvt. Ltd. (ACE) is QCI-NABET accredited EIA consulting

organization (Certificate No.: NABET/EIA/1013/012) for varied sectors including Onshore

And Offshore Oil and Gas Exploration and Development and Transportation of Oil and Gas

through Pipelines (Category A). ACE has been awarded ISO 9001: 2008 certified (Certificate

no: 22340/10/S) by RINA, to provide consultancy services for water supply, waste water

treatment, municipal solid waste management, environment and social impact assessment,

environment impact and audit, remote sensing and geographical information systems. ACE

has provided its consulting services and has successfully completed projects in India and

other countries including Mongolia, U.A.E., Vietnam, etc. ACE has carried out EIA and EMP

studies for Oil & Gas, infrastructure and industrial developmental sectors; HSE compliance

audits; and has also been involved in design of water supply, wastewater management,

industrial waste treatment, solid wastes and hazardous wastes management systems.

11

IINNTTRROODDUUCCTTIIOONN


Asian Consulting Engineers Pvt. Ltd. 1-1

INTRODUCTION

1.1 BACKGROUND

Assam is one of the most vibrant states in the North Eastern region of India and is rich in

important natural resources that appeal many investors to set up their production and

manufacturing units in the state. It is blessed with huge quantities of river water, abundant

limestone, dolomite and coal resources and has enormous potential of hydrocarbon

production. The Assam & Assam Arakan Basin with major tectonic elements has rich

deposits of these hydro carbons including both Crude oil and gas. The basin has been

explored for more than 60 years now and ONGC has been instrumental in exploring these oil

reserves.

ONGC has found high potential oil and gas reserves in the Golaghat and Jorhat districts of

Assam. Extending the exploration of these reserves, ONGC proposes 12 wells for Onshore

Development drilling in the Nambar, East Lakhibari, Khoraghat and Khoraghat Extension

Mining lease areas in the Golaghat district and Borholla Mining lease area in the Jorhat

district of Assam. The estimated cost of the proposed project is INR 240.00 crores. Figure 1.1

shows the project location map.

Figure 1.1: Project Location map

1



1.1.1 Project Objectives and Benefits

As per a report published by FICCI, India is the fifth largest energy consumer in the world.

While the world consumes 12000 million tonnes of oil equivalent (mtoe) of energy resources,

India consumes 4.4% of the world total (524.2 mtoe). Of the total primary energy

consumption basket, oil and gas constitute 45% share in the total energy basket mix. About 78

per cent of India„s petroleum consumption is met from imports (mostly of crude oil), while

about 25% of natural gas (including LNG) consumption comes from imports. It is estimated

that in the coming years, the import dependency for crude oil alone would reach above 90%

level.

Thus, Development of existing oil reserves has become a necessity to bridge the rising

demand-supply gap, reduce import dependency and make ourselves resilient to the external

factors of economic and political disruptions in the sourcing nations. Considering this

scenario, ONGC proposes development of oil and gas reserves by development drilling of 12

wells in Golagahat and Jorhat districts of Assam. The development of these projects will

reduce the dependency of India on import of oil by adding to the availability of energy

sources in the country. It will also have a socio-economic benefit at the local level by

development of infrastructure like Roads, Drainage etc. and by providing employment

opportunities.

1.1.2 Project Proponent

Oil and Natural Gas Corporation Limited (ONGC) is a Public Sector Undertaking (PSU) of

the Government of India, under the administrative control of the Ministry of Petroleum and

Natural Gas. It is India's largest oil and gas exploration and Production Maharatna Status

Company with crude oil, natural gas, LPG, NGL, Petrol, HSD etc. as the key products. It

produces around 70% of India's crude oil (equivalent to around 25% of the country's total

demand) and around 60% of its natural gas (ONGC). Along with hydrocarbons, ONGC has

expanded its horizon to emerging domains of renewable and other alternative sources of

energy. With a market capitalization of over INR 2 trillion, it is one of India's most valuable

publicly-traded companies.

1.1.3 EIA Consultant

Development of any oil and gas exploration project requires Environmental Impact

Assessment (EIA) study as per the regulatory requirements and best practices. ONGC has

proposed to conduct an EIA study for „Development Drilling of 4 wells in Borholla ML

block, Jorhat District and drilling of 8 wells in Nambar ML area, East Lakhibari ML area,

Khoraghat ML area and Khoraghat Extension ML area in Golaghat district, Assam” and has

engaged M/s Asian Consulting Engineers Private Limited for the EIA studies and

preparation of an Environment Management plan.

This report pertains to the EIA study for “Development Drilling of 4 wells in Borholla ML

block, Jorhat District and drilling of 8 wells in Nambar ML area, East Lakhibari ML area,

Khoraghat ML area and Khoraghat Extension ML area in Golaghat district, Assam” and to

obtain Environmental Clearance (EC) form the MoEF, Government of India.

Asian Consulting Engineers Pvt. Ltd. (ACE) is QCI-NABET accredited EIA Consulting

Organization (Certificate No.: NABET/EIA/1013/012) for varied sectors including Offshore

and Onshore Oil and Gas Exploration, Development, Production & Oil and Gas transportation



through pipelines. The Quality Management System of ACE is ISO 9001:2008 Certified.

ACE has provided its consulting services and has successfully completed projects in India and

other countries including Mongolia, U.A.E., Vietnam, etc. ACE has carried out EIA and EMP

studies for Oil & Gas, Infrastructure and Industrial Developmental Sectors; HSE Compliance

Audits; and has also been involved in Design of Water Supply, Wastewater Management,

Industrial Waste Treatment, Solid Wastes and Hazardous Wastes Management Systems.

1.2 DESCRIPTION OF ML AREAS OF JORHAT AND GOLAGHAT DISTRICTS

The blocks awarded to ONGC fall in the Jorhat and Golaghat districts of Assam. In total 12

wells are proposed to be drilled at Borholla ML area (4 wells) in Jorhat District as well as

Nambar ML area (4 wells), East Lakhibari ML area (1 well), Khoraghat ML area and

Khoraghat Extension ML area (3 wells) in Golaghat districts of Assam. The total ML area of

Jorhat district and Golaghat district is 32.116 sq. km. and 120.5 sq. km. respectively.

1.3 LEGAL AND OTHER REQUIREMENTS

ONGC activities will conform to all National and International legislations, regulations,

conventions, etc., relating to aspects of hydrocarbon operations in India. The project shall

abide by the Oil Industry Safety Directorate (OISD) Guidelines and Standards. Recognizing

the need of Environmental Safety, Operator has established an HSE Policy towards

Environmental Protection. A list of applicable Acts and Rules is described in Table 1.1

below.

Table 1.1: Applicable Acts and Guidelines

Issues Applicable Legislation

Hazardous

Substances &

Wastes

1) The Environment (Protection) Act, 1986 and Rules there under -

a) Hazardous Wastes (Management, Handling and Trans-boundary

Movement) Rules, 2008 and amendments thereafter;

b) Guidelines for disposal of solid wastes by Oil Drilling and Gas

Extraction industry as notified, vide notification dated GSR 176 (E)

April 1996;

c) Manufacture Storage and Import of Hazardous Chemicals 1989 and

amendments thereafter.

d) Solid waste, drill cutting and drilling fluids disposal for onshore

drilling operation as per vide GSR. 546(E) dated 30th August, 2005

2) The Public Liability Insurance Act, 1991 and Rules 1991

3) Central Motor Vehicles Act, 1988 and Rules, 1989

4) The Petroleum Act, 1934

Water 5) The Water (Prevention and Control of Pollution) Act, 1974, and

amendments thereafter

6) The Environment Protection Act, 1986 - Standards for liquid

discharge by Oil Drilling and Gas Extraction industry as notified vide

notification dated GSR 176 (E) April 1996.

Air 7) The Air (Prevention and Control of Pollution) Act, 1981 and

amendments thereafter.

8) The Environment Protection Act, 1986 – Guidelines for discharge for

gaseous emissions by Oil Drilling and Gas Extraction industry as

notified vide notification dated GSR 176 (E) April 1996

9) The Environment (Protection) Second Amendment Rules, 2002 –

Emission Standards for New Generator Sets.

10) The Motor Vehicles Act, 1938 and amendments thereafter.



Issues Applicable Legislation

Noise 11) The Environment (Protection) Second Amendment Rules, 2002

(Noise Limits for New Generator Sets).

12) The Noise (Regulation & Control) Rules, 2000.

Safety and

Protection

against

Pollution of

Environment

13) Oil Mines Regulations, 1984.

14) Oil Field (Regulation and Development) Act 1948 and The Petroleum

& Natural Gas Rules, 1959 and amendments thereafter.

The project is also designed so as to abide by the guidelines set out by The Central Pollution

Control Board (CPCB) and Ministry of Environment & Forests (MoEF), Government of India

on various Environmental Management issues.

The EIA process has been undertaken to meet the requirements of Ministry of Environment

and Forests, Government of India.

1.4 SCOPE OF EIA STUDY

The scope of the EIA study includes identification of the potential environmental impacts of

the project and formulation of an effective Environmental Management Plan (EMP) to

prevent, control & mitigate the adverse environmental impacts, and ensure environmental

compliance. The Terms of Reference (ToR) for this project were approved by MOEF vide J-

11011/49/2014-IA II (I) dated 18th December, 2014 as given below. The copy of approved

ToR along with Form - 1 and Pre-Feasibility Report (PFR) is annexed as Annexure - I.

The Committee prescribed the following TORs for the preparation of EIA/EMP report:

1) Executive summary of project

2) Project description, project objectives and project benefits

3) A certified copy of the report of the status of compliance of the conditions stipulated in

the environmental clearance and Consent to Operate for the ongoing /existing operation

of the project by the Regional Office of the Ministry of Environment and Forests and

SPCB.

4) Site details within 1 km of the each proposed well, any habitation, any other

installation/activity, flora and fauna, approachability to site, other activities including

agriculture/land, satellite imagery for 10 km area. All the geological details shall be

mentioned in the Toposheet of 1 :40000 scale, superimposing the well locations and other

structures of the projects

5) CRZ clearance/ recommendation from State Coastal Zone Management Authority, if

applicable.

6) Details of forest land involved in the proposed project. A copy of forest clearance letter, if

applicable.

7) Permission from the State Forest Department regarding the impact of the proposed project

on the surrounding National Park/Wild life Sanctuary/Reserve Forest/Eco sensitive area,

if any. Approval obtained from the State/Central Government under Forest (Conservation

Act, 1980 for the forestland shall be submitted.

8) Distance from nearby critically/severely polluted area as per Notification, if applicable.

9) Does proposal involves rehabilitation and resettlement? If yes, details thereof.

10) Details of project cost.



11) Environmental considerations in the selection of the drilling locations for which

environmental clearance is being sought. Present any analysis suggested for minimizing

the footprint giving details of drilling and development options considered

12) Baseline data collection for air, water and soil for one season leaving the monsoon season

in an area of 10 km radius with centre of Oil Field as its centre covering the area of all

proposed drilling wells.

a. Topography of the project site.

b. Ambient Air Quality monitoring at 8 locations for PM10, S02, NOx, VOCs,

Methane and non-methane HC.

c. Soil sample analysis (physical and chemical properties) at the areas located at 5

locations

d. Ground and surface water quality in the vicinity of the proposed wells site.

e. Climatology and Meteorology including wind speed, wind direction, temperature

rainfall relative humidity etc.

f. Measurement of Noise levels within 1 km radius of the proposed wells.

g. Vegetation and land use; Animal resources

13) Incremental GLC as a result of DG set operation.

14) Potential environmental impact envisages during various stages of project activities such

as site activation, development, operation/ maintenance and decommissioning.

15) Actual source of water and 'Permission' for the drawl of water from the Competent

Authority. Detailed water balance, wastewater generation and discharge.

16) Noise abatement measures and measures to minimize disturbance due to light and visual

intrusions in case coastally located.

17) Treatment and disposal of waste water.

18) Treatment and disposal of solid waste generation.

19) Disposal of spent oil and lube.

20) Storage-of chemicals and diesel at site.

21) Commitment for the use of WBM only

22) Mud make-up and mud and cutting disposal - all options considered shall be listed with

selective option.

23) Hazardous material usage, storage accounting and disposal.

24) Disposal of packaging waste from site

25) Oil spill emergency plans in respect of recovery/ reclamation.

26) H2S emissions control.

27) Produced oil handling and storage

28) Details of scheme for oil collection system along with process flow diagram and its

capacity.

29) Details of control of air, water and noise pollution in oil collection system.

30) Disposal of produced/formation water.

31) Whether any burn pits being utilized for well test operations

32) Restoration and decommissioning plans which shall include mud pits and wastage

restoration also and documentation and monitoring of site recovery.

33) Measures to protect ground water and shallow aquifers from contamination.



34) Risk assessment and disaster management plan for independent reviews of well designed

construction etc. for prevention of blowout.

35) Environmental management plan.

36) Documentary proof of membership of common disposal facilities, if any

37) Details of environmental and safety related documentation within the company including

documentation and proposed occupational health and safety Surveillance Safety

Programme for all personnel at site. This shall also include monitoring programme for the

environmental.

38) Total capital and recurring cost for environmental control measures.

39) A copy of Corporate Environment Policy of the company as per the Ministry's O.M. No.

J-11 013/41 /2006-IAII(I) dated 26th April, 2011 available on the Ministry's website.

40) Public hearing to be conducted and issues raised and commitments made by the project

proponent on the same should be included in EIAIEMP Report in the form of tabular

chart with financial budget for complying with the commitments made.

41) Any litigation pending against the project and or any direction/order passed by any court

of law against the project. If so details thereof.

42) A tabular chart with index for point-wise compliance of above TORs.

The following general points should be noted:

(i) All documents should be properly indexed, page numbered.

(ii) Period/date of data collection should be clearly indicated.

(iii) Authenticated English translation of all material provided in Regional languages.

(iv) The letter/application for EC should quote the MOEF file No. and also attach a copy of

the letter.

(v) A copy of the letter received from the Ministry should be also attached as an annexure

to the final EIA-EMP Report.

(vi) The final EIA-EMP report submitted to the Ministry must incorporate the issues in this

letter. The index of the final EIA-EMP report must indicate the specific chapter and

page no. of the EIA-EMP Report where the above issues have been incorporated.

(vii) „Certificate of Accreditation‟ issued by the QCI to the environmental consultant

should be included.

1.5 APPROACH & METHODOLOGY OF THE EIA STUDY

1.5.1 Approach of the EIA Study

The EIA study basically includes establishment of the present environmental scenario within

the study area. EIA report consists of study of the specific activities related to the project and

evaluation of the probable environmental impacts, thus, leading to the recommendations of

necessary environmental pollution control measures. The entire EIA study has been carried

out on the basis of the applicable Environmental Legislation, Regulations and Guidelines of

MoEF, Government of India.

1.5.2 Establishment of Baseline Environmental Status

A comprehensive database on the baseline environmental status/conditions of the study area

has been established through review, compilation & analysis of:

Existing published secondary data/ literature/ information collected, and



Primary data generated/ collected through field study, survey and monitoring.

1.5.3 Field study/ Monitoring for generation of Primary Data

The collected secondary data has been appropriately supplemented by conducting the

necessary primary data generation/ collection through field study/monitoring. The field

monitoring has been carried out as per the guidelines of CPCB & BIS and requirement of the

MoEF.

1) Soil Monitoring: To study the soil characteristics in the study area, soil samples from

representative locations in the study area have been collected and analysed for important

relevant physical & chemical parameters.

2) Water Quality Monitoring: For drawing up the baseline data on water quality, water

quality monitoring has been conducted at representative locations in the study area.

Ground and Surface water samples have been collected and analyzed for important

relevant physical and chemical parameters.

3) Ambient Air Quality Monitoring: For drawing up the baseline status of ambient air

quality in the study area, ambient air quality monitoring in respect of PM10, SO2, NO2, HC

and VOC has been conducted at representative locations in the study area.

4) Noise Monitoring: To establish the ambient noise scenario in the study area, monitoring

of ambient noise level has been carried out at the representative locations in the study area

using a suitable portable sound level meter over a period of twenty-four hours.

1.5.4 Environmental Impact Assessment

This includes collection of primary data through field investigations, environmental

monitoring and secondary data from sources like Maps, Reports and Scientific Literatures etc.

The collected data is then analyzed for identification of impacts and cost effective mitigation

measures are suggested. The Environmental Impact Assessment has been conducted in

accordance with the norms and guidelines of the MoEF/CPCB Government of India.

A point-wise compliance of approved ToR for proposed project is given in Table 1.2.



Table 1.2: TOR Compliance Status for Development Drilling in Golaghat and Jorhat Districts, Assam

S. No. TOR Requirement Status

1 Executive summary of a project Complied.

2 Project description, project objectives and project benefits Chapter 2; Section 2.1 to 2.8.

Chapter 7; Section 7.1.

3

A certified copy of the report of the status of compliance of the conditions stipulated in the

environmental clearance and Consent to Operate for the ongoing /existing operation of the project by

the Regional Office of the Ministry of Environment and Forests and SPCB.

Annexure - II.

4

Site details within 1 km of the each proposed well, any habitation, any other installation/activity,

flora and fauna, approachability to site, other activities including agriculture/land, satellite imagery

for 10 km area. All the geological details shall be mentioned in the Topo sheet of 1 :40000 scale,

superimposing the well locations and other structures of the projects

Chapter 3; Section 3.4.3 & Section 3.3.1.

5 CRZ clearance/ recommendation from State Coastal Zone Management Authority, if applicable. Not Applicable.

6 Details of forest land involved in the proposed project. A copy of forest clearance letter, if applicable. Chapter 3; Section 3.4.3.

7

Permission from the State Forest Department regarding the impact of the proposed project on the

surrounding National Park/Wild life Sanctuary/Reserve Forest/Eco sensitive area, if any. Approval

obtained from the State/Central Government under Forest (Conservation Act, 1980 for the forestland

shall be submitted.

No eco-sensitive area is located within 10 km

of the study area.

8 Distance from nearby critically/severely polluted area as per Notification, if applicable. Not Applicable.

9 Does proposal involves rehabilitation and resettlement? If yes, details thereof. No.

10 Details of project cost. Chapter 1; Section 1.1.


11

Environmental considerations in the selection of the drilling locations for which environmental

clearance is being sought. Present any analysis suggested for minimizing the footprint giving details

of drilling and development options considered





12 Baseline data collection for air, water and soil for one season leaving the monsoon season in an area

of 10 km radius with centre of Oil Field as its centre covering the area of all proposed drilling wells.

(i) Topography of the project site.

(ii) Ambient Air Quality monitoring at 8 locations for PM10, S02, NOx, VOCs, Methane and non-

methane HC.

(iii) Soil sample analysis (physical and chemical properties) at the areas located at 5 locations

(iv) Ground and surface water quality in the vicinity of the proposed wells site.

(v) Climatology and Meteorology including wind speed, wind direction, temperature rainfall

relative humidity etc.

(vi) Measurement of Noise levels within 1 km radius of the proposed wells.

(vii) Vegetation and land use; Animal resources

Chapter 3; Sections 3.2 to 3.4.

13 Incremental GLC as a result of DG set operation. Chapter 4; Section 4.3.1.

14 Potential environmental impact envisages during various stages of project activities such as site

activation, development, operation/ maintenance and decommissioning.


15 Actual source of water and 'Permission' for the drawl of water from the Competent Authority.

Detailed water balance, wastewater generation and discharge.

Chapter 2; Section 2.8.2 & Section 2.9.3.

16 Noise abatement measures and measures to minimize disturbance due to light and visual intrusions in

case coastally located.

Chapter 2; Section 2.9.1.


17 Treatment and disposal of waste water. Chapter 4; Section 4.3.3.


18 Treatment and disposal of solid waste generation. Chapter 4; Section 4.3.4.


19 Disposal of spent oil and lube. Chapter 8; Section 8.5.

20 Storage-of chemicals and diesel at site. Chapter 8; Section 8.3.

21 Commitment for the use of WBM only Chapter 2; Section 2.5.3.

Only WBM will be used.

22 Mud make-up and mud and cutting disposal - all options considered shall be listed with selective Chapter 2; Section 2.5.3 & Section 2.9.3.




option. Chapter 8; Section 8.3 & Section 8.5.

23 Hazardous material usage, storage accounting and disposal. Chapter 2; Section 2.9.3.

Chapter 8; Section 8.3 & Section 8.5.

24 Disposal of packaging waste from site Chapter 8; Section 8.5.

25 Oil spill emergency plans in respect of recovery/ reclamation. Chapter 6; Section 6.2 & Section 6.3. Chapter

8; Section 8.3.

26 H2S emissions control. Chapter 6; Section 6.2.

27 Produced oil handling and storage Chapter 2; Section 2.6.

28 Details of scheme for oil collection system along with process flow diagram and its capacity. Chapter 2; Section 2.6.

29 Details of control of air, water and noise pollution in oil collection system. Chapter 2; Section 2.6; Section 2.9.

30 Disposal of produced/formation water. Chapter 2; Section 2.9.3.

31 Whether any burn pits being utilized for well test operations No.

32 Restoration and decommissioning plans which shall include mud pits and wastage restoration also

and documentation and monitoring of site recovery.



33 Measures to protect ground water and shallow aquifers from contamination. Chapter 4; Section 4.3.3.

34 Risk assessment and disaster management plan for independent reviews of well designed

construction etc. for prevention of blowout.

Chapter 6; Section 6.2 & Section 6.3.

35 Environmental management plan. Chapter 8.

36 Documentary proof of membership of common disposal facilities, if any No.


37 Details of environmental and safety related documentation within the company including

documentation and proposed occupational health and safety Surveillance Safety Programme for all

personnel at site. This shall also include monitoring programme for the environmental.

Chapter 5.

Chapter 8; Sections 8.2, 8.4, and 8.7.

Annexure - III.

38 Total capital and recurring cost for environmental control measures. Chapter 8; Section 8.8.




39 A copy of Corporate Environment Policy of the company as per the Ministry's O.M. No. J-11 013/41

/2006-IAII(I) dated 26th April, 2011 available on the Ministry's website.

Annexure - IV.

40 Public hearing to be conducted and issues raised and commitments made by the project proponent on

the same should be included in EIA/EMP Report in the form of tabular chart with financial budget

for complying with the commitments made.

To be Conducted.

41 Any litigation pending against the project and or any direction/order passed by any court of law

against the project. If so details thereof.

No.

42 A tabular chart with index for point-wise compliance of above TORs. Chapter 1; Section 1.5.4.



1.6 STRUCTURE OF THE REPORT

Chapter 1 : Introduction - Provides a background to the project, the

project proponent and environmental

legislations / permits applicable to the project;

TOR for the EIA study - provides the terms of

reference for the Environmental Impact

Assessment study for the proposed project.

Chapter 2 : Project Description - Describes the operations associated with the

project.

Chapter 3 Description of the

Environment

- Describes the background environmental

characteristics and the other economic

activities in the area.

Chapter 4 : Anticipated

Environmental Impacts

& Mitigation Measures

- Identifies potential environmental impacts due

to the Proposed Project and applicable

mitigation measures.

Chapter 5 : Environmental

Monitoring Program

- Describes the mechanism to address the

adverse environmental impacts during

different phases of the project.

Chapter 6 : Additional Studies - This chapter includes Risk assessment and

Disaster Management Plan. Risk assessment

section will accentuate the types of risks

associated with exploratory drilling operations

and their assessment. Disaster management

section illustrates about the emergency

preparedness and disaster management plan.

Chapter 7 : Project Benefits - This chapter details the benefits associated

with the project to the local community as well

as to the nation.

Chapter 8 : Environment

Management Plan

- Provides delivery mechanism to address the

potential environmental impacts.

Chapter 9 : Summary & Conclusion - This chapter summarizes justification for

implementation of the project with mitigation

measures.

Chapter 10 : Disclosure of

Consultants engaged

- The name of the Consultants engaged with

their brief resume and nature of consultancy

engaged.

22

PPRROOJJEECCTT

DDEESSCCRRIIPPTTIIOONN



PROJECT DESCRIPTION

2.1 KEY INFORMATION

Name of the Project : Development Drilling in Jorhat and Golaghat districts

Location : Jorhat and Golaghat districts, Assam

Total Area of the Project Jorhat District:

Borholla ML area

-

32.116 km2

Golaghat District:

Nambar ML area


Khoraghat ML area

Khoraghat Extension ML area

Total

-

-

-

-

-

26 km2

8.5 km2

3 km2

83 km2

120.5 km2

Number of Proposed Wells : Total 12 wells (4 wells in Jorhat and 8 wells in Golaghat

District)

Jorhat District:

Borholla ML area

-

4 wells

Golaghat District:

Nambar ML area


Khoraghat and Khoraghat Extension

ML area

-

-

-

4 wells

1 well

3 wells

Total Estimated Drilling Period for

each Well

upto 45 days for shallower wells (depth upto 2500 m)

2 to 3 months for Deeper wells (depth > 2500 m).

Proposed Drilling Fluid for each

well

Water-based Mud System

Type of Hydrocarbon Expected : Oil/Gas

Estimated Cost of the Project : INR 240 Crores

2.2 PROJECT OBJECTIVES

ONGC is planning Onshore Development drilling of 12 wells in the Nambar, East Lakhibari,

Khoraghat and Khoraghat Extension Mining lease areas in the Golaghat district and Borholla

Mining lease area in the Jorhat district of Assam.

2



2.3 PROJECT LOCATION

The proposed drilling locations are located in the Borholla ML area of Jorhat district having

an area of 32.116 sq. km. and Nambar, East Lakhibari, Khoraghat and Khoraghat Extension

ML areas of Golaghat district covering an area of 120.5 sq. km.

The geo-graphical co-ordinates of the ML blocks and drilling locations are given in Table 2.1

and Table 2.2 respectively. The project location is depicted in Figure 2.1 & Figure 2.2. A

simplified geographical map of hydrocarbon fields and approximate road distance map is

shown in Figure 2.3, Figure 2.4 and Figure 2.5 respectively.

Table 2.1: Co-ordinates of the ML blocks

Block/

ML areas

Boundary

Points

Latitude Longitude

Degree Minutes Seconds Degree Minutes Seconds

Borholla

ML

A 26 29 27.29 94 12 59.72

F 26 23 4.56 94 10 50.52

L 26 22 31.85 94 8 3.01

K 26 23 51.99 94 8 3.01

M 26 24 8.35 94 9 45.48

N 26 27 49.15 94 9 12.51

Nambar

N1 26 5 47.57 93 53 12.37

N2 26 4 46.23 93 56 7.45

N3 26 4 9.43 93 55 19.34

N4 26 3 25.27 93 56 3.89

N5 26 2 31.29 93 55 37.16

N6 26 2 37.43 93 52 5.45

East

lakhibari

1A 26 22 50.45 94 2 55.5

2B 26 22 5.45 94 4 25.5

3C 26 21 4.09 94 3 31.5

4D 26 22 7.2 94 0 54

1A 26 22 50.45 94 2 55.5

1A 26 22 50.45 94 2 55.5

2B 26 22 5.45 94 4 25.5

Khoraghat

1A 26 4 9.43 93 55 19.34

2B 26 4 46.23 93 56 7.45

3C 26 4 5.34 93 56 52.89

4D 26 3 25.27 93 56 3.89

1A 26 4 9.43 93 55 19.34

Khoraghat

Ext.

1A 26 5 47.57 93 53 12.37

2B 26 9 23.07 93 56 6.58

3C 26 9 12.44 93 59 55.55

4D 26 2 25.57 93 58 17.54

5E 26 2 31.29 93 55 37.36

6F 26 3 25.27 93 56 3.89

7G 26 4 5.34 93 56 52.89



Block/

ML areas

Boundary

Points

Latitude Longitude


8H 26 4 46.23 93 56 7.45

1A 26 5 47.57 93 53 12.37

Table 2.2: Co-ordinates of the Drilling Locations

Sl.

No.

Block/

ML areas

Drilling

Site

Latitude Longitude


1 Borholla ML BRDO 26 27 13.25 94 10 26.17

2 BRDN 26 26 1.2 94 10 9.39

3 BRDP 26 26 54.67 94 10 10.57

4 BRDQ 26 26 42.41 94 10 40.75

5 Nambar NRDJ 26 02 51.23 93 53 9.57

6 NRDK 26 03 40.51 93 54 18.43

7 East lakhibari ELDA 26 22 05.34 94 02 45.67

The remaining 05 wells shall also be drilled from the identified locations, depending upon the

production testing results of the 07 wells and additional studies planned to be carried out in

the future to target deeper prospects. All 12 wells shall be taken up for drilling under different

drilling campaigns in a phase-wise manner.

It may however, be noted that some changes in exact drilling locations and programme are

always likely based on the findings of additional reservoir studies, development drilling etc.

All wells to be drilled from the identified ML areas.



Figure 2.1: Project Location of Nambar, Khoraghat and Khoraghat ML areas



Figure 2.2: Project Location of East Lakhibari and Borholla ML areas



Figure 2.3: Field Geography of Hydrocarbon Reserve Areas

Figure 2.4: Field Geography of Jorhat



Figure 2.5: Approximate Road Distance Map

2.4 PRIOR TO DRILLING

Drilling operations shall be carried out at the five mining lease areas of the Jorhat and

Golaghat districts to extract the trapped hydrocarbons. The estimated drilling period for

shallower wells (Depth upto 2500 m) is upto 45 days and Deeper wells (Depth > 2500 m) is 2

to 3 months. The methodology for the oil field is as follows:

2.4.1 Site Survey

The location of 12 wells is considered by ONGC on the recommendation of its Sub-

Surface Department, based on the geological data available and the seismic data acquired.

A preliminary site survey was undertaken by ONGC drilling team and the Sub Surface

team. Apart from the geological and seismic property, habitations and forest area are also

considered while selecting drilling sites. Drilling locations are usually located away from

habitations, if drilling location falls on the existing habitation, directional drilling is

carried out. It means drilling in the nearby area of the habitation and connecting it with

the reservoir through tunnelling within the earth to evade the disruption to habitation.

The sequence of events involved after release of location and before Drilling of the

Development well is given below:

Site survey and access road alignment – will be undertaken through qualified consultant /

contractor by Engineering Services of ONGC.

Construction of approach road, well site, foundation and cutting of effluent pits etc. –

preparation by Civil Contractor under the Engineering Services of ONGC.



2.4.2 Road and site construction

The road and site construction work of Approach Road and Drilling Site consists of the

following works:

Construction of plinth area, foundation for rig & its accessories, temporary sheds, cellar

pit and cutting retainer pits as per standard lay-out drawing of the drilling rig. Earth filling

will be required for plinth preparation

Approach roads will be constructed for all the locations for movement of men and

materials. Stream crossings if any, will be done by building suitable culverts or bailey

bridge

Upgradation and strengthening of the existing roads wherever available. No clearing/

minimum clearing of trees will be ensured for this work.

Construction of Drilling Pads at the end of the new road to facilitate Drilling and Testing

of Oil/Gas well. The tree cover at the site will have to be removed. Felling will be limited

to those in critical positions, others will not be felled and the Rig equipment will be

stationed around them.

2.5 DRILLING OPERATION

The exploitation of hydrocarbons requires the construction of a conduit between the surface

and the reservoir. This is achieved by the drilling process. Well(s) will be drilled using a

Conventional Land Rig equipped with a Rotary Drive System. The layout of Drilling site with

Facilities is shown in Figure 2.6.



Figure 2.6: Layout of Drilling Site with Facilities

2.5.1 Components of Drilling Rig

A typical drilling rig is shown in Figure 2.7 and its main components are discussed below:



Figure 2.7: The Anatomy of Drilling Rig

a) Draw Works

i) Input horse power rating-minimum 1000 HP with nominal depth rating of 3000m

(approximately) with 41/2”/5” OD drill pipes. Hoisting capacity-250 Tons (227MT).

ii) Draw works will be operated by electrical motors or two engines having combined

Horse Power of 1000 HP (output). Draw works will be equipped with at least one

Auxiliary Brake and one parking cum Emergency Brake to stop the operations.

b) Mast

Mast will have minimum clear height of around 128 feet. It will have a hook load

capacity of 500,000 lbs with 10 (ten) lines and wind resistance with full set back-80mph.

c) Sub-Structure

Rotary capacity will not be less than 500,000 lbs and set back capacity 275,000lbs.

Combined capacity of hook load & setback will not be less than 775,000lbs.

d) Mud Pump

Two triplex mud pumps equivalent to minimum input of 1000 HP each. Pumps will be

fitted with liners (7”-5 ½ sizes) and pistons. Power transmission is driven by 2 DC motors

of 900 HP each. The pumps will be coupled with centrifugal charging pumps driven by

50 HP motors for flooded suction, Pulsation Dampener of 5000 psi. The discharge of each



mud pump should not be less than 2440 LPM at 2300 psi. The pumps should be rated to a

discharge pressure of 5000 psi.

e) Rotary Swivel

Swivel will have a minimum dead load rating of 275 Tons with 5000 psi working

pressure.

f) Power Pack

Engines-minimum 4 (four) nos. turbocharged, after cooled, air start, diesel driven each

capable of delivering 1000 HP.

g) Travelling Block and Hook

Unitized traveling block and hook assembly of 250 T capacity with at least 5 sheaves

grooved suitable for drill line and with minimum 12 line operation.

h) Drill Pipes

A total of 3000m of 5” OD, grade G, 19.5 PPF & 3000m 27/8” OD grade E, 10.4ppf, SLH

-90 drill pipes.

i) Drill Collars

Suitable quantity of 91/2”, 8”, 61/2” and 31/2” Drill Collars will be used.

j) Blow Out Preventer (BOP)

i) 13.5/8”X5M double ram BOP

ii) 13.5/8”X5M Annular BOP

iii) 7.1/16”X5M Double ram BOP.

k) BOP Control Unit

Proper BOP (Blow out Preventer) system will be used for the Drilling Operation to

contain any unexpected pressures from the well. The BOP Control System is to be

compatible with the BOP stack.

The Rig including drilling & auxiliary equipment & DSA facilities comprise of around 90

trailer loads. To support the drilling operation, the following systems and services are

included for the Drilling Operations:

i) Portable Living Quarters – to house essential personnel on site on a 24 hr basis. These

units are provided with Bath/Washroom.

ii) Crane-age - cranes for loading/off loading equipment and supplies.

iii) Emergency Systems - this includes fire detection and protection equipment. Medical

Doctor will be available for Emergency Medical Attention.

iv) Environmental Protection – Blow Out Prevention (BOP) system, HDPE Lined

Effluent Pits, mobile Effluent Treatment Plant (ETP).

One typical layout of drilling site giving locations of various facilities is shown in Figure 2.8.



1) Crown Block

2) Catline Boom and Hoist Line

3) Drilling Line

4) Monkeyboard

5) Traveling Block

6) Top Drive

7) Derrick or Mast

8) Drill Pipe

9) Doghouse or drillers shack

10) Blowout Preventer

11) Water Tank

12) Electric Cable Tray

13) Engine Generator Sets

14) Fuel Tanks

15) Electrical Control Room

16) Mud Pump

17) Bulk Mud Components Storage

18) Mud Pits

19) Reserve Pits

20) Mud Gas Separator

21) Shale Shakers

22) Choke Manifold

23) Pipe Ramp

24) Pipe Racks

25) Accumulator

Figure 2.8: Typical On-Shore Drilling Rig

2.5.2 Well construction

Drilling wells are drilled in sections, with the diameter of each section decreasing with

increasing depth. The lengths and diameters of each section of the well are determined prior

to drilling through well designing.

Well spudding is the start of drilling activity. Top-hole section will be drilled to a desired

depth based on well design. After drilling top-hole section, it will be cased with a pipe called

"Casing". The casing provides support to the drilled hole wall and secures the hole-section.

Other than this, it isolates problematic hole-sections such as loose zones, shale sections, over

pressurized formations, etc. After running casing, the annular space around the hole wall and

casing (annulus) will be cemented. This process of drilling and casing the hole-sections is

continued as per the well design until the final well depth (target) is achieved.



2.5.3 Drilling fluids

During Drilling Operations, a fluid known as Drilling Fluid (more commonly Mud) is

pumped through the drill string down to the drilling bit and returns between the drill pipe and

hole / casing annulus up to surface back into the circulation system after separation of drill

cuttings / solids through solids control equipment. Drilling fluid is essential to the drilling

operation and performs the following functions:

Cleans the bottom of the hole by removing the cuttings and carrying them to surface;

Cools and lubricates drill bit and string;

Continuously builds a wall around the inside of the hole which prevents the hole from

caving in;

Counters natural formation pressures, preventing the uncontrolled flow of oil, gas, or

water into the borehole;

Holds cuttings and weighing material in suspension, when circulation is stopped;

Supports part of the weight of drill pipes, casing, tubing, etc.;

Transmits hydraulic horse power to the bit;

Acts as medium for electrical well logging;

Ensures maximum information about the formations penetrated;

Prevents corrosion of tubular.

The composition of Water based drilling fluid is given in Table 2.3.

Table 2.3: Ingredients of Water Based Drilling Fluid

Sl. No. Component Quantity

1 KCI-PHPA-Polyol Mud Composition-KCI ~3 %

2 PHPA 0.2-0.3 %

3 PAC 0.5-0.75 %

5 E P Lube 0.2-0.3 %

6 Bentonite 2-3 %

8 Caustic Soda for pH 8-5-9.0

9 XC Polymer 0.3-0.5 %

10 S. Asphalt 2-3 %

Type of Drilling Fluid (Mud)

An environment-friendly Water-Based Mud (WBM) system will be used for drilling of the

proposed wells. It may be noted that a typical WBM may contain nearly 80% water and 20%

Clay as well as Chemicals by weight. The ingredients of WBM and Special Additives and

their Function in Water Based Drilling Fluids are given in Table 2.4 and Table 2.5

respectively.



Table 2.4: Ingredients of Water Based Drilling Mud

Sl.

No.

Raw

Material Quantity

1 Barite 150 MT/Well

2 Bentonite 90 MT/Well

3 Carboxyl Methyl Cellulose 2.2-3 MT/Well

5 Resinated Lignite 2 MT/Well

6 Non-Weighted Spotting Fluid ASOS

8 Extreme Pressure (EP) Lube 1000 Lts/Well

9 Drilling Detergent 1800 Lts/Well

10 Caustic Soda 4.4 MT/Well

11 Potassium Chloride 35 MT/Well

12 Soda Ash 1.3 MT/Well

Table 2.5: Special Additives and their Function in Water Based Drilling Fluids

Sl. No. Discharge Category Function of Additives

1. Sodium bicarbonate Eliminate excess calcium ions due to cement

contamination

2. Sodium Chloride Minimize borehole washout in salt zone

3. Groundnut shells, mica of

cellophane Minimize loss of drilling mud to formation

4. Cellulose polymers or starch Counter thick, sticky filter cake, decrease filter

loss to formation

5. Aluminium stearate Minimize foaming

6. Vegetable Oil

lubricant Reduce torque and drag on drill string.

7. Pill of oil-based mud spotting

fluid

Counter differential pressure sticking of drilling

string. Pill is placed down hole opposite contact

zone to free pipe

Mud Circulation & Solid Control System

The drilling fluid circulation system consists of several items of equipment as given in Figure

2.9. The mud pumps take drilling fluid from tanks and pump the same to the bit through drill

pipes. The mud travels through annulus and finally falls over the shale shaker. The mud used

during the operation will flush out formation cuttings from the well bore which will be

separated from the fluid using solids control system. This will include shale shakers, de-

sanders, de-silters etc. The process of reusing the drilling fluid during drilling operation is

commonly known as “closed loop system”. The system is ideal for drilling operations in

sensitive environments as it cuts down immensely on the total water consumption for the

formulation of drilling mud and also saves on the consumption of the chemicals.



Figure 2.9: Typical Drill Fluid Circulation System

Special applications of Drilling Fluid

To overcome various types of well problems, specific components are added to the mud to

adjust the properties for ensuring that following functions are met:

Fluid loss control: Bentonite as well as naturally occurring additives such as starch and

cellulose are added to the drilling mud to retard fluid loss to the formation.

Lost circulation: Naturally occurring fibrous, granular or flaky materials are used to stop

lost circulation when the drill bit enters a highly porous or fractured formation. Typical

materials include sawdust, groundnut shells, mica etc.

Lubricity: Normally the drilling fluid is sufficient to lubricate and cool the bit. However,

under extreme loading, other lubricants such as EP lube, Linseed oil etc are added to

prevent the drill string from becoming stuck.

Shale Control: To control caving, sloughing etc. of the well bore, shale stabilizer (e.g.

magcoasphasol) is used.



pH control: Caustic Soda is used to control the alkalinity of the drilling fluid in the range

of pH of 9 to 10. This ensures the optimum performance of the polymers in the fluid and

controls bacterial activity.

Pressure control: Barite is generally used as a weighting material to control down-hole

formation pressure and to prevent the ingress of formation fluid into well bore.

The essential ingredients of the WBM are all low toxicity materials, rated either as Grade ‟E‟

products (according to the new OCNS grading system), or Grade „O‟ (according to the former

OCNS system). These are the two lowest toxicity categories. A variety of other products will

be available for various contingencies. Thinners such as chrome free ligno-sulphonates

(CFLS) and lignin compounds may be used to control Rheology.

2.5.4 Cementing Program

Oil well cementing is the process of preparing slurry of API Class G cement with water and

various additives in required quantities as accelerators/ retarders, density adjusters,

dispersants, fluid loss additives, anti gas migration additives, etc. This slurry is pumped down

through steel casing to cover the critical points in the annulus around the casing in the open

hole.

Functions of the cementing process

Bond and support the casing strings;

Isolate oil, gas and water bearing zones;

Protect fresh water bearing zone from contamination;

Prevent Blowouts by quickly forming a seal;

Seal off zones of lost –circulation or thief zones;

Protect casing from corrosion; and

Protect casing from shock loads.

2.5.5 Well evaluation

Well Logging

Wire line logging operations are undertaken with specialized equipment mounted on custom

built trucks to provide information on the potential type and quantities of hydrocarbons

present in the prospective formations.

There are different well logging techniques including electric, electronic, sonic, radioactive

logging etc. Logging instruments (sensors) are attached to the bottom of a wire line and

lowered to the bottom of the well. They are then slowly brought back, the devices reading

different geo-scientific parameters pass each information and record the corresponding data

on graphs, which can be interpreted by the drilling team. There are no emissions to the

environment associated with wire line logging operations. The radioactive sources required

for well logging operations will be kept in specially designed containers, if used.



Well Testing

If prospects of hydrocarbons appear in conventional core or in wire line logs, a detailed

production testing is carried out. For production testing equipments like separator, ground X-

mas tree, and compressors are required.

Conventional Coring

Conventional cores of sub-surface formations are taken on selective basis to carry out Petro-

physical and Geo-scientific studies.

2.5.6 Completion of drilling

On completion of activities, the well will be either plugged or suspended (if the well

evaluations indicate commercial quantities of hydrocarbons) or will be permanently

abandoned. In the event of a decision to suspend the well, it will be filled with a brine

solution containing very small quantities of inhibitors to protect the well. The well will be

sealed with cement plugs and some of the wellhead equipment (Blind Flange) will be left on

the surface (Cellar).

If the well is abandoned it will be sealed with a series of cement plugs, all the wellhead

equipment will be removed leaving the surface clear of any debris and the site will be

restored.

2.5.7 Rig Demobilization

Demobilization will involve the dismantling of the rig and Drill Site Accommodation (DSA),

and transporting it out of the project area. It is expected that demobilization will take

approximately 30 days and will require around 80 to 85 trailer and 50 to 55 truck loads.

2.5.8 Restoration and Rehabilitation

On completion of drilling activities, well site restoration plan will be prepared for the

following two scenarios:

1) Commercially viable Hydrocarbons are discovered

In the event that economic quantities of hydrocarbons are found, the well will be shut in with

a wellhead / X-mas tree in place, but all other equipment and materials will be removed from

present location to the next drilling site. At the end of well testing at each drilling site, the

HDPE Lined Secured Pits for Drill Cuttings and Drilling Mud will be covered with a top

HDPE lining. The pit will then be backfilled with minimum 300 mm layer of soil.

2) Economic Quantities of Hydrocarbons are not found

In the event that economic quantities of hydrocarbons are not found an abandonment plan will

be implemented for the drilling site in accordance with the applicable Indian regulations,

OISD, Oil Mines Regulation (OMR) etc. Plugging requirement of abandoned wells as per Oil

Mines Regulation, 1984 are as follows:

When it is intended to abandon a well:

All permeable formations shall be isolated with cement;

Cased hole may be abandoned by placing a bridge-plug on top of perforations;



A cement plug of minimum length of 50 m shall be placed at the bottom of the well;

A cement plug of a minimum length of 50 m shall be placed across the shoe of surface

casing;

The cellar pit around the well shall be filled up and the land shall be restored to the

original level; and

Every abandoned well shall be clearly identified at site.

In addition to the above, guidelines as advised by MoEF, New Delhi and SPCB shall also be

followed. The overriding principle is that the environment should, with time be reinstated

broadly to its original condition. Until such time as this is achieved, ONGC would actively

manage the reinstatement process.

2.6 COLLECTION AND TRANSPORTATION OF PRODUCED OIL AND GAS

The produced oil and gas will be collected through flow lines and processed in the existing

Group Gathering Stations (GGS) in the ML areas. The details of collection and transportation

are given in Table 2.6 below.

Table 2.6: Collection and Transportation of Produced Oil and Gas

Sl.No. ML Area Proposed

Wells

Collection

stations Transportation

1 Nambar ML

area

04 2 GGS already

functional in

Nambar area

through pipelines

At the GGS, the oil and gas will

be separated, Oil will be

transported to Nambar GGS-1

and gas will be supplied to the

consumer

2 Khoraghat

and

Khoraghat

Ext. ML area

03 2 GGS already

functional in

Khoraghat area

through pipelines



transported to Khoraghat GGS-1

and gas will be supplied to the

consumer

3 East

Lakhibari

ML area

01 Well will be

produced through

Early Production

system, in which

separator and

tanks are used

Produced oil & gas from the wells

will be transported to Borhalla

GGS through tankers

4 Borholla ML

area

04 2 GGS already

functional in

Borholla area

through pipelines



transported to Borholla GGS and

gas will be supplied to the

consumer

The layout maps and process floe diagrams (PFDs) of exiting GGS facilities are shown in

Figure 2.10 to Figure 2.15.

Once the drilling proves commercial viability, the well will be connected to existing GGS

facilities through a 4” flow line. Figure 2.16 shows the well flow route for Borholla GGS.

The pipeline coverage in the ML areas is given below:



12” oil trunk pipeline (43 Km) from BRH GGS to CTF Jorhat

8” oil trunk pipeline system (65 Km) from KHG GGS-I to BRH GGS

8” well fluid pipeline (4.5 Km) from NR GGS to KHG GGS-I

3 1/2”gas pipeline ( 4.5 Km) from NR GGS via well KH-09 & NR-02 to KHR GGS-I



Figure 2.10: Layout Map of Borholla GGS



Figure 2.11 (a): Process Flow Diagram of Borholla GGS



Figure 2.11 (b): Schematic Diagram of Borholla GGS Process Flow



Figure 2.12(a): Layout Map of Khoraghat GGS-1



Figure 2.12 (b): Schematic Diagram of Khoraghat GGS-1 Facility Layout



Figure 2.13: Process Flow Diagram of Khoraghat GGS-1



Figure 2.14: Layout Map of Nambar GGS-1



Figure 2.15: Process Flow Diagram of Nambar GGS-1



Figure 2.16: Well Flow Line Route of Borholla GGS

2.7 STAFFING

During drilling activities, job will be carried out in two 12 hourly shifts. The drilling rig is

operated by around 25-30 people on the rig at any time. The workers will be staying in a DSA

near the rig operation. The base DSA will be temporary in nature and will be maintained by

about 20 staffs for cooking, cleaning, laundry services, housekeeping, etc.

2.8 RESOURCE REQUIREMENT

All supplies, both for the drilling rig package and for the DSA at the well site as well as near

the drilling site will be transported from any storage area temporarily hired near to the well

site. This will include but not limited to cement, bits, casings and chemicals for drilling mud,

spare parts for the rig package, and food and other supplies for the DSA. A catering company

will be engaged to provide canteen facilities and sanitation at the DSA.

2.8.1 Power consumption and fuel

The power requirements during the site preparation and construction phase will be met by

DG Sets. Although the drilling operations will be continuous, the power requirement will



vary depending on the activities being carried out. It is anticipated that the energy source

is a part of the drilling rig to be used. 3-4 DG sets of 1430 KVA will suffice the requirement

of rig operations, for the DSA for lighting and other emergency requirements. Only low

sulphur (<0.05%) HSD (Euro-III) will be used.

During the drilling phase, the fuel consumed will mainly be diesel used by rig, various

equipments and generators, which will be used for lighting and other emergency requirements

within the site. The fuel consumption is estimated to be about 6 kl/d of diesel per well. There

will be on-site storage for fuel, which will be provided by the drilling contractor and

transported to the site by tanker lorries.

2.8.2 Water requirement

The water requirement during drilling operation is mainly meant for preparation of drilling

mud apart from washings and domestic use. The source of water is ground water and

extracted from the bore wells. While the former consumes the majority of water requirement,

the water requirement for domestic and wash use is very less. The daily water consumption

will be 25 kld per well. The details are given in Table 2.7. The water balance diagram is

shown in Figure 2.17.

Table 2.7: Water utilization per well

S.

No Description

Fresh Water

Required (KLD)

1 Mud Preparation and Treatment 12

2 Cutting, Washing/Cleaning at Shale Shaker 3

3 De-sander and De-silter 4

4 Floor/Kelly Washing 1

5 Engine Cooling/Mud Pump 1

6 Domestic 4

Total 25



Figure 2.17: Water Balance Diagram

2.8.3 Chemicals

Various chemicals will be stored at the project site and used during the drilling phase. The

chemicals that are likely to be used have been listed in Drilling Fluid Plan section. At the

planning stage, an estimate of the potential usage for every chemical will be made. During the

operation phase, chemical usage will be monitored and efforts will be made to reduce or

conserve chemical consumption as much as technically possible. While storing, the drilling

rig will have normal storage facilities for fuel oil, required chemicals and the necessary

tubular and equipment. The Diesel which will be used for power consumption, stored at drill

site in covered MS tanks (2 nos.) of 40 kl capacity each.

The storage places will be clearly marked with safe operating facilities and practices as per

established standards prescribed in “Manufacture, Storage and Import of Hazardous

Chemicals, 1989” by MoEF.

2.9 NOISE, AIR EMISSIONS, EFFLUENTS AND SOLID WASTE GENERATION

2.9.1 Noise

Sources of noise at the drilling site include:

Diesel powered generators

Rotating equipment such as electric motors, rotary table, draw works, etc.

Noise level at the periphery of the drilling well plinth will not exceed 75 dB (A) and will

decrease rapidly on moving away from the well site. Vehicular traffic on approach road is

expected to generate temporary noise level of less than 70 dB (A) at about 10 m distance.

2.9.2 Air Emissions

Emissions generated during the drilling phase will consist of the following:



Exhaust emissions from generators operating at site;

Dust emissions from vehicular traffic movement on roads;

Emissions from flares during testing.

The proposed drilling site will have 3-4 diesel generators (each of 1430 KVA capacity).

No treatment of air emissions is required as these involve burning of diesel with low Sulphur

content (< 0.05%). The disposal of the air emissions will be through adequate stack height as

per norms.

Movement of about 3 to 4 passenger and heavy vehicles in a day is not likely to have any

adverse impact on the environment.

Air emissions may result from gas flaring activities during the well testing and is a temporary

activity of two-three days only. The test flare boom will be located at a distance from the

drilling rig.

Heat Generation

The drilling work will generate heat which will be dissipated to the WBM (about 500C at

surface) and then to the atmosphere. Hence, it is unlikely to have any noticeable effect in the

area surrounding the drilling rig.

Potential Accidental Events

Due to observation of necessary safety requirements as per OMR, OISD and other regulations

vis-à-vis Safe Operating Practices (SOP), chances of accident occurring are negligible.

However, in all aspects of hydrocarbon exploration, there is always a risk of non-routine or

accidental events such as

Occurrence of blow out

Occurrence of sour gas (H2S)

Blow out followed by ignition can be extremely hazardous. Blow out Preventers (BOP) are

always used to combat abrupt appearance of sub surface high pressure. Sour gas (H2S) may

also be released from the well along with gaseous hydrocarbons. However, it is known that

crude oil/gas in this region is sweet in nature; i.e. there is no presence of H2S in produced

oil/gas.

Spillage of diesel fuel is near negligible from storage facilities at the drilling site.

2.9.3 Effluents and Solid Waste

The following types of wastes are likely to be generated during the drilling activities:

Drill Cuttings: comprises of drilled formation cuttings, mainly shale, sands and clay

Under flow from solid removal equipment: Generated from solids control/removal

equipment

Drill cuttings wash water: This is generated while washing the mud laden cuttings/

cavings separated through shale shaker/vibrating screen

Drainage discharges: Drainage discharges will occur from a variety of sources. These

include:



o Cleaning at derrick floor area

o Machine area floor drains

o Cleaning of shale shaker screens

Sewage: Waste water generated from office toilets and labour/staff accommodation

Chemical Sludge: Waste water treatment would result in generation of chemical sludge

Hydrocarbon Wastes: Used oils during replacement of oil in machineries

Non-hazardous solid waste: Non hazardous wastes like paper, cloth rags, jute, wood,

plastics, containers, etc.

Medical Wastes: Small quantities of medical wastes like used bandages, syringes, empty

medicinal bottles etc.

Bio-degradable waste: The DSA would generate food waste or fallen leaves constituting

biodegradable wastes

Drill Cuttings

During drilling operations, approx 225 m3 per well of wet drill cuttings are expected to be

generated from each well depending on the type of formation and depth of drilling. The mud

used during the operation will transport formation cuttings from the well bore to the surface.

These cuttings will be separated from the drilling mud using a solids-control system. This will

comprise a system of processes consisting of linear motion shale shaker/ vibrating screens,

hydro-cyclones (including de-sanders and de-silters), and centrifuges to mechanically separate

cuttings from the mud fluid. These cuttings will be stored on site in HDPE lined pits and

disposed into the waste pit as per the direction of regulatory authority.

The drilling mud is reused in the system. This “closed loop system” is ideal for drilling

operations as it cuts down immensely on the total water consumption for the formulation of

drilling mud and also saves on the consumption of chemicals. If it is not used so, it will be

tested to ascertain hazardous or non-hazardous nature and disposed off as per directions from

regulatory authority.

Wastewater and Sludge

In addition to the cuttings 15-17 m3/day of wastewater is likely to be generated during well

drilling. Once the cuttings have been separated, the drilling fluid will be reused or processed

after further treatment. Drilling wastewater would be collected in HDPE lined pits and will be

treated by Mobile Effluent Treatment Plant (ETP). In case of excess water, permanent ETP

attached at existing GGS facilities will be used. An average of 50 m3 /day waste water is

treated by the ETP. The capacity of ETP is 125 m3/day and part of treated waste water

(approx. 4000 m3/well) will be reused in mud preparation, shale shaker cleaning and other

operation related applications. Two ETPs are also proposed, which will be installed one each

in Borholla GGS and Khoraghat GGS-1 facility. The flow chart of the ETP is shown in

Figure 2.18.



Figure 2.18: Flow Chat of Effluent Treatment Plant (ETP)

The oil sludge is collected in a concrete sludge storage facility at a centralized location and

disposed by bio-remediation.

Produced/Formation Water

Produced/formation water separated during gas processing will sent to the produced water

storage tank after the chemical treatment for intermediate storage before disposal. Then,

produced water transfers from storage tank through produced water pumps to existing

produced water disposal header and from disposal header produced water is sent for injection

into disposal wells below 1000 m depth as per CPCB guidelines.

Sewage

As part of the site preparation stage, a drainage and sewerage system will be constructed. The

sewerage system will consist of septic tanks followed by soak pits for the collection and

treatment of wastewater generated from the DSA kitchen, laundry, and showers. Overflow

from the soak pits, if any will be sprayed over the ground allowing it to soak away or

evaporate. The semi-solid residue from septic tanks will be periodically cleaned and

transported to nearest available municipal solid waste disposal site.

Solid Waste

Solid waste including domestic waste (from kitchen, offices etc), combustible and recyclable

waste generated shall be collected, segregated and stored in specified containers and shall be

transferred to authorized contractors for its disposal.



Hazardous Waste

Hazardous waste such as waste lube/system oil approximately 0.15 kL/well from machinery,

used oil from D.G set (in case in operation), lead acid cells and oil filters are likely to be

generated. The waste shall be handled as per Hazardous Wastes (Management, Handling and

Trans-boundary Movement) Rules, 2008. The waste will be carefully stored in drums, and

given to MoEF approved recyclers for its final disposal. All precautions will be taken to avoid

spillage from the storage.

Recyclable material will periodically be transported out of the project area and given to the

recyclers/contractors. Disposal of specified hazardous wastes including discarded containers

will be sent back to the chemical supplier and ensured that all surplus or residual chemical

additives are also given back to them on restocking basis.

Medical waste

Small amounts of medical waste like used syringes, bandages, empty medicinal bottles etc.,

will be generated. Usually this may not be more than few kilograms. After proper segregation,

this waste will be disposed properly as per norms.

Drill Accommodation Site (DSA)

All biodegradable waste (left over food, kitchen waste etc.) will be disposed off into small

humus pits in DSA area away from use by rig crew members. The pits will be covered to

avoid any odour nuisance and contact with flies or insects. The sewerage system will consist

of soak pits for collection of waste water from the DSA kitchen, laundry and showers.

Sewage from toilets will go into septic tanks.

33

DDEESSCCRRIIPPTTIIOONN OOFF

TTHHEE EENNVVIIRROONNMMEENNTT



DESCRIPTION OF THE

ENVIRONMENT

3.1 KEY INFORMATION

The different components of the Environment, namely Air, Noise, Water (Surface and

Ground Water), Soil, Ecology and Socio-Economy of the study area have been defined in this

chapter. The entire block areas of the five ML areas involved in the project are considered as

study area for baseline assessment. Both Primary and Secondary information is used to assess

the baseline condition. One season monitoring of various environmental parameters were

carried out from October 2015 to December 2015.

Delineation of environmental baseline condition with respect to Air, Noise, Water (Surface

and Ground Water), Soil, Ecology and Socio-Economy is done to further facilitate in Impact

Identification and Assessment, which is described in the subsequent chapter.

3.2 SITE DESCRIPTION AND ITS ENVIRONS

The Drilling locations are located in two Districts of Assam, namely Jorhat and Golaghat.

Twelve numbers of development wells are proposed to be drilled in four ML blocks in

Golaghat district and one ML area in Jorhat district. In Golaghat, total 9 wells were proposed

to be drilled in Nambar ML area (four wells), East Lakhibari ML area (one well), Khoraghat

and Khoraghat Extension ML area (Three wells). In Jorhat, total 4 wells were proposed to be

drilled in Borholla ML area. The location of these ML areas is shown in Figure 3.1. The ML

areas mainly consist of open lands and vegetation cover.

3



Figure 3.1: Location of ML areas

3.3 REGIONAL SETTING

3.3.1 Topography, Geology and Stratigraphy

Assam possesses a unique geomorphic environment with plain areas, dissected hills of the

South Indian plateau system and with the Himalayas all around its north, north east and east.

GOLAGHAT

JORHAT



As per plate tectonics, it is the eastern most projection of the Indian plateau where it is

thrusting underneath the Eurasian plate thereby creating a subduction zone geologically (Syed

& Bright). Hence the extreme geostatic pressures exerted on the landmass during the creation

of the Himalayas have resulted in Assam having large areas of sedimentary deposits leading

to formation of huge oil reserves.

Geomorphologically, the younger alluvial plain occupies major part of the Borholla ML and

small scattered parts are occupied by older alluvial plains. The vast alluvial plains of

Brahmaputra valley occupy most of the North Assam including Jorhat, and Golaghat districts.

Out of the six agro-climatic zones in Assam, the two districts lie in the Upper Brahmaputra

Valley (NAEB).

The oil and gas in Upper Assam till 1980s was found in the Barail Group of Upper Eocene to

Lower Oligocene age and the Tipam Group of Upper Miocene age. However during the last

decade oil and gas accumulations have been discovered within the Langpar and Lakadong

formations of Paleocene to Lower Eocene age. In the Khoraghat and Nambar fields situated in

southeastern part of the Dhansiri Valley, oil occurs in the Bokabil Formation (Middle

Miocene) which is not developed towards north in the Brahmaputra valley. In the Borholla

oil field, oil occurs in fractured granitic basement rock of Precambrian age (DGH India,

2010).

3.3.2 Seismicity

Based on the inputs obtained from India Meteorological Department (IMD) and other

agencies, Bureau of Indian Standards [IS-1893 – part – 1: 2002], has classified the whole

country into four seismic zones namely Zone II, III, IV and V. Of these, zone V is rated as the

most seismically active region, while zone II is the least. The Modified Mercalli (MM)

intensity, which measures the impact of the earthquakes on the surface of the earth, broadly

associated with various zones is as follows:

Seismic Zone Intensity on MM scale

II (Low intensity zone) VI (or less)

III (Moderate intensity zone) VII

IV (Severe intensity zone) VIII

V (Very severe intensity zone) IX (and above)

The Seismic Zoning Map of India [IS 1893 (Part I):2002] is shown in Figure 3.2.



Figure 3.2: Map showing Seismic Zones of India

According to this map, the study region falls in Zone V and is prone to earthquakes of

moderate to very high intensity. It has previously experienced devastating earthquakes and

has caused extensive landslides, rock falls on the hill slopes, subsidence and fissuring of

ground in the valley and has also caused change in course and configuration of its rivers and

tributaries including Brahmaputra.

Historically, the region has experienced two major earthquakes in 1897 and 1950 of 8.7 and

8.5 intensities on the Richter scale respectively. Apart from these, there is a recorded history

of around twenty destructive earthquakes which has affected this region in the past century

(Souce: National Institute of Disaster Management (NIDM)).

3.4 STATE OF THE ENVIRONMENT

3.4.1 Climate

The Golaghat and Jorhat District lies in the Hot sub-humid (moist) to humid (inclusion of per-

humid) eco-regions (Source: National Remote Sensing Centre (NRSC) & Central Water

Commission (CWC), 2014). The climate is dominated by the subtropical monsoon which is

normally active from April to October with occasional winter showers. At times approach of

monsoon is also marked by cyclones in April and May. The plains get flooded. Autumn and

winter are dry seasons. Ten years historical rainfall data was collected from Indian

Meteorological department. Monthly rainfall variations for the two districts are illustrated in

Figure 3.3 and Figure 3.4. Yearly rainfall data is depicted in Figure 3.5. The yearly rainfall

Assam



for Golaghat district varied from minimum 1232 mm to maximum 1871 mm with an average

rainfall of 1450 mm. The yearly rainfall for Jorhat district varied from minimum 1380 mm to

maximum 2112 mm with an average rainfall of 1755 mm.

Figure 3.3: Monthly rainfall variations for Golaghat district (10 years data)

Figure 3.4: Monthly rainfall variations for Jorhat district (10 years data)

0

100

200

300

400

500

600Ra

infa

ll m

m

Avg. Min Max

0

100

200

300

400

500

600

Rai

nfa

ll m

m

Avg. Min Max



Figure 3.5: Historical rainfall data for Golaghat and Jorhat Districts

Average temperature in the state varies from 4°C to 19°C during the winter and 26°C to 37°C

during the summer accompanied by high humidity (Source: Geological Survey of India (GSI),

2009). Meteorological data was collected for the study period of October to December 2015

and is summarized in below Table 3.1.

Table 3.1: Climate Data for the Study Area

Golaghat District

Month Temperature (°C) Wind speed (mph) Total

Rainfall

(mm)

Humidity (%)

Max Min Min Max Avg. Avg.

October 37 12 0 5 1.95 121.2 83.60

November 31 11 0 5 2.08 14.1 80.37

December 29 3 0 6 2.08 20.4 78.12

Jorhat District

Month Temperature (°C) Wind speed (mph) Total

Rainfall

(mm)

Humidity (%)

Max Min Min Max Avg. Avg.

October 37 14 0 6 2.02 248.4 79.90

November 31 6 0 4 1.93 54.9 79.99

December 30 4 0 5 2.09 44.2 76.46

3.4.2 Micro-Meteorology

Meteorological study exerts a critical influence on air quality as it is an important factor in

governing the ambient air quality. The meteorological data recorded during the study period

was used for identifying air quality sampling locations as well as input for air quality

simulation models. Wind speed data was collected on field during October to December 2015.

The wind rose diagrams for the study area were plotted for Golaghat district and Jorhat

district and are shown in Figure 3.6 and Figure 3.7.

1000

1200

1400

1600

1800

2000

2200

2004 2005 2006 2007 2008 2009 2010 2011 2012 2013

Rai

nfa

ll m

m

GOLAGHAT Rainfall in mm JORHAT Rainfall in mm



Figure 3.6: Wind rose diagram for Golaghat district (Oct to Dec 2015)

The analysis of the average wind pattern for Golaghat district shows predominant winds

blowing mainly from NNE for 34% of the time. The calm wind conditions prevailed for 3.8%

of the total time.



Figure 3.7: Wind rose diagram for Jorhat district (Oct to Dec 2015)

The analysis of the average wind pattern for Jorhat district shows predominant winds blowing

mainly from NNE for 29% of the time. The calm wind conditions prevailed for 4.08% of the

total time.

3.4.3 Land Use Land Cover

The Land Use Land Cover (LULC) within the block have been studied and it can be broadly

classified into seven major categories, namely, settlements, fallow land, agricultural land,

vegetation cover, open land, sand bar and river. The land use distribution in the study area is

given in Table 3.2. The LULC map of the study area is given in the Figure 3.8, Figure 3.9

and Figure 3.10.



Figure 3.8: LULC study of Borholla ML area



Figure 3.9: LULC study of Nambar, Khoraghat and Khoraghat Extension ML area



Figure 3.10: LULC study of East Lakhibari ML area

Table 3.2: Landuse Distribution of the Study Area

Sl.

No.

Landuse

Category

Borholla ML

area

Khoraghat ML, Khoraghat-

ext. ML and Nambar ML area

East Lakhibari ML

area

Area km2 % Area km

2 % Area km

2 %

1 Settlement 1.75 5 12.95 12 1.91 22

2 Agricultural

Land 9.43 29 0 - 1.24 15

3 Vegetation Cover 16.12 50 20.6 18 2.23 26

4 Fallow Land 4.82 15 0 - 1.21 14

5 Open Land 0 - 70.5 63 1.92 23

6 Sand Bar 0 - 2.4 2 0 -

7 River 0 - 5.57 5 0 -

Total 32.1 100 112.0 100 8.51 100

Thus the three landuse maps conclude that majority of the area in the blocks of Nambar,

Khoraghat, Khoraghat Extension, and East Lakhibari includes open land and vegetation

cover. There is no open land in Borholla district and vegetation cover is high in this area.

Agriculture is also practiced in these areas, especially in Borholla and East Lakhibari ML

areas.



3.4.3.1 Site Details of Drilling Site

Twelve drilling locations have been proposed in this project. The surrounding features for the

same within 1 km radial distance have been tabulated in Table 3.3. From the table, it is

evident that all the coordinates are located on agricultural land area. Photo Plate 3.1 shows

the photographs of the study area.



Table 3.3: Important Features within 1 Km Radius of Drilling Locations

Drilling

Locations Co-ordinates Connectivity Water Body Habitation Vegetation Other Features

Borholla ML Area

BRDO 26027'13.25"N

94010'26.17"E

Kacha road 100m (NW)

Metalled Road 930m (NW)

None

Silldubi

230 m (E)

Agricultural

land

Nagaland State boundary 478m (W)

Tea Processing Plant 355m (SW)

BRDN 26026'1.2"N

94010'9.39"E

Kacha roads 110m (NW)

Metalled Road 939m (NW)

None Silldubi

250m (E)

(Scattered

Settlement)

Agricultural

land


BRDP 26°26'54.67"N

94°10'10.57"E

Metalled road 140m (S) None Silldubi

270m (NE)

Agricultural

land

-

BRDQ 26°26'42.41"N

94°10'40.75"E

Kacha road Adjacent to the

site (E)

None Silldubi

180m (W)

Agricultural

land



ELDA 26022' 05.34" N

94002'45.67"E

Metalled road 47m (W) Pond

185m (W)

1 No.

Navojyoti

350m (W)

Agricultural

land

-

Nambar ML Area

NRDJ 26002'51.234" N

93053'9.57"E

Village Road 100m (NW) Pond Rajpokhri

340m (N)

Agricultural

land

-

NRDK 26003'40.512" N

93054'18.432"E

Village Road

187m (N)

Pond

470m (WSW)

Toksae

780m (W)

Agricultural

land

-



Borholla Block Borholla Block

Nambar Block Nambar Block

Khoraghat Block Khoraghat Ext Block

Photo Plate 3.1: Project Area

3.4.4 Forest Land

As per IT and RS & GIS Cell 2015 of Wildlife Institute of India, the study area lies in North

East Brahmaputra Valley. The main Wildlife protected areas near the study area are

Kaziranga National Park, East Karbi Anglong Wildlife Sanctuary, Deepar Beel wildlife



Sanctuary, Nambor- Doigrung Wildlife Sanctuary, Nambor Wildlife Sanctuary, Marat Longri

Wildlife Sanctuary and Hallongapara Gibbon Wildlife Sanctuary. The distance of all these

sensitive areas from the ML areas is depicted in Figure 3.11 below.

Figure 3.11: Distance of Wildlife Sanctuaries and National Parks from the Project Area

(Source: Wildlife Institute of India, 2015)

There are no eco-sensitive areas or wild life sanctuaries within the 10 km of the study area.

The nearest Wildlife Sanctuary is the Nambor Wildlife Sanctuary from the boundary of East

Lakhibari ML areas at a distance of 10.5 km. Other sensitive areas are at a distance greater

than 25 km.

3.4.5 Soil Characteristics

The common soil-scapes of the area are represented by level to very gently sloping

Haplaquepts, Haplaqualfs, Dystrochrepts, Eutrochrepts, Fluvaquents, and Hapludalfs (Souce:

National Remote Sensing Centre (NRSC) & Central Water Comission (CWC), 2014).

3.4.5.1 Methodology

Soil samples were collected from the field to assess its physico-chemical characteristics in the

study area. The soil samples at all location were collected at the depth of 0.5 to 1.0 meters. A

number of parameters were determined which are indicative of physical, chemical and

fertility characteristics. The soil samples were collected from different locations and labeled

accordingly. Photo Plate 3.2 shows the soil sample collection in the study area. The

triangular classification of soil as shown in Figure 3.12 was used for analysis. The sampling

locations are given in Table 3.4, which can also be seen in Figure 3.13 and the analysis

results are given in Table 3.5.



Figure 3.12: Triangular Classification of Soil

Table 3.4: Soil Sampling Locations

Sl.

No.

Location

Code Sampling Locations Coordinates

Jorhat District

1 SS-1 Near ONGC Site, Borholla 26027’04.0”N 94010’37.1”E

Golaghat District

2 SS-2 Near ONGC Site ,East Lakhibari 26022’07.6”N 94002’55.1”E

3 SS-3 Near ONGC Site NRDK, Nambar 26003’21.9”N 93054’38.0”E

4 SS-4 Near ONGC Site, Khoraghat 26005’09.8”N 93057’01.0”E

5 SS-5 Ghulapani, Khorghat Ext. 26003’54.5”N 93056’01.4”E



Figure 3.13: Soil Sampling Location Map



Photo Plate 3.2: Collection of Soil Samples

Table 3.5: Results of Soil Analysis

Sl.

No. Parameter Unit

Jorhat

District Golaghat District

SS1 SS2 SS3 SS4 SS5

1 pH - 6.2 6.8 6.1 6.6 7.2

2 Electrical

Conductivity µs/cm 76 95.3 97.4 67.8 71.2

3 Color - Brown Brown Brown Brown Brown

4 Organic Carbon % by Mass 2.35 4.85 4.70 5.12 5.64

5 Bulk density mg/m3 1.78 1.8 1.72 1.76 1.7

6 Water holding

capacity % 11 10 13 15 12

7 Salinity gm/100gm 0.58 0.88 0.37 0.44 0.58

8 Porosity % 9.7 8.51 10.22 9.31 7.55

9 Sand % by weight 63.8 23.4 18.7 20.4 21.0

10 Clay % by weight 26.3 14.1 17.4 14.1 22.6

11 Silt % by weight 9.9 65.5 63.9 65.5 56.4

12 Texture - Loamy Sand Clay Clay Clay Clay

13 P available mg/100gm 1.9 1.7 1.9 1.7 1.3

14 Total Kjeldhal

Nitrogen % by mass 1.54 1.87 3.14 1.56 1.23

15 K available mg/100 gm 0.04 0.06 0.02 0.07 0.03

16 Sodium mg/kg 625 862.7 813.6 824.5 816.7

17 Calcium mg/kg 3570 6412.8 5126 7016 6798

18 Magnesium mg/kg 3456 2400 3360 3540 2852

19 SAR - 0.09 0.14 0.13 0.12 0.15

20 Iron mg/kg 307.51 718.36 316.42 652.45 476.8

21 Copper mg/kg 8.12 12.23 10.24 9.88 10.45

22 Zinc mg/kg 25.6 47.82 54.24 84.45 47.89

23 Manganese mg/kg 212.33 156.87 97.89 117.56 31.9

24 Nickel mg/kg 33.2 42.9 51.8 47.8 63.67

3.4.5.2 Monitoring Results

The soil samples collected from the study area reveal Loamy Sand to Clay characteristics

which is evident from the analytical results of soil samples (as given in Table 3.5), when

correlated with the given ‘Triangular Classification of Soil’ (as depicted in Figure 3.12). The



soil had brownish appearance. The following conclusions could be made from the above

tabulated data:

Soil pH varied in the range 6.1 – 7.2 with an average value of 6.58, it denotes that the soil

is neutral in nature.

The textural analysis of soil revealed the clay nature of the soil, with the percentage of

sand ranging from 63.8 – 18.7%, whereas the clay and silt quantity ranged from 14.1 –

26.3% and 9.9-65.5%, respectively.

The Organic Carbon Value in the sampled soil ranged from 2.35 – 5.64%.

The concentration of Nitrogen, Phosphorous and Potassium ranged from 1.23-3.14

mg/100g, 1.3 – 1.9 mg/100g and 0.02 – 0.07/100g, respectively.

Heavy metals like Nickel, Aluminium, Lead, Chromium, Cadmium and Copper were

found to be Below Detectable Limit.

The zinc and iron concentration in the sampled soil varied from 25.6 – 47.89 mg/l and

316.42 – 718.36 mg/l, respectively.

3.4.6 Water Environment

The water resources including both surface and groundwater play an important role in the

development of an area. Likewise, the water resources of the area have been studied to

establish the current status of water quality in the area. The drainage map of project area is

given in Figure 3.14.

Figure 3.14: Drainage Map of Study Area



No rivers are passing through the Borholla ML and East Lakhibari ML area. However, the

Dhansiri River passes through the Nambar ML area, Khoraghat ML area and Khoraghat

Extension ML area. The Dhansiri River rises in the south west corner of Nagaland below the

Laishiang peak. From its source upto Dimapur, the Dhansiri forms the boundary between the

districts of Cachar, Nagaon and Nagaland. Beyond Dimapur, the river enters and flows

through the Karbi Anglong and Golaghat districts of Assam.

Surface Water

Four surface water samples were collected from different places within the study area.

Groundwater

Groundwater is an important source in the study area and is used for drinking, irrigation and

fish breeding. Negative fluctuation with a fall in range of 2 - 4 m bgl and 4 m bgl is noticed

in Jorhat, Karbi Anglong, Golaghat, Sibasagar, Nagaon, Kamrup districts of Assam and

Jaintia Hills and Ribhoi districts of Meghalaya due to overexploitation of ground water for

different purposes and other natural cycle disruption like less rainfall etc. (Souce: National

Remote Sensing Centre (NRSC) & Central Water Comission (CWC), 2014). According to the

Ministry of Water Resources, River Development and Ganga Rejuvenation as well as The

Ministry of Agriculture (Department of Agricultural Research and Education) (DARE), both

Jorhat and Golaghat districts have presence of high arsenic content in groundwater (Ministry

of Water Resources, River Development and Ganga Rejuvenation, 2014). Another study also

confirmed presence of high iron and arsenic levels in Golaghat district of Assam (Chetia,

Sarma, Banerjee, Singh, & Dutta, 2010), (Central Ground Water Authority (CGWB), 2013).

The ground water categorization of blocks in Golaghat and Jorhat district is given in Table

3.6. Five groundwater samples were collected from different places within the study area.

Table 3.6: ML Blocks and their Categorization as per Central Ground Water Authority

(CGWA)

Sl.

No. Name of ML Blocks District

Category

GWRE Area Type

1

East Lakhibari, Nambar,

Khoraghat, Khoraghat

extension ML areas

Golaghat Safe Not-notified

2 Borholla ML Jorhat Safe Not-notified

Source: Central Ground Water Authority (CGWA), 2011

3.4.6.1 Water Quality Assessment & Methodology

The sampling and analysis of water were carried out as per Standard Methods of Water and

Wastewater Analysis (APHA). Nine water samples were collected from ground and surface

water bodies within the block. A total of four samples from surface except Borholla and five

samples from ground water bodies were taken from different locations and were analysed for

physico-chemical parameters. The results of Ground Water Analysis have been compared

with IS: 10500-2012 drinking water standard to assess their suitability for drinking purpose.

Sampling locations for surface and ground water samples are listed in Table 3.7, which are

also shown in Figure 3.15 and Figure 3.16. Photo Plate 3.3 and Photo Plate 3.4 shows the

water sample collection in the study area.



Table 3.7: Water Sampling Locations

Figure 3.15: Surface Water Sampling Location Map

Sl.

No.

Location

Code

Name of the

Sampling Location Coordinates

Surface Water Samples

1 SW1 East Lakhibari 26022’06.7”N 94002’39.3”E

2 SW2 Nambar 26003’27.9”N 93

053’46.4”E

3 SW3 Khoraghaat 26005’05.4”N 93057’03.9”E

4 SW4 Khoraghaat Ext. 26003’57.4”N 93056’16.4”E

Ground Water Samples

5 GW1 Borhola 26027’0.0.2”N 94 010’16.59”E

6 GW2 East Laakhibari 26022’07.6”N 94002’55.1”E

7 GW3 Nambar 26003’26.0”N 93053’42.9”E

8 GW4 Khoraghat 26005’02.0”N 93056’57.7”E

9 GW5 Khoraghat Ext. 26003’56.4”N 93056’03.01”E



Photo Plate 3.3: Collection of Surface Water Samples

Figure 3.16: Ground Water Sampling Location Map



Photo Plate 3.4: Collection of Ground Water Samples

3.4.6.2 Monitoring Results

The raw data for the Ground and Surface Water Quality Analytical Results are given in Table

3.8 and Table 3.9 respectively.

Table 3.8: Ground Water Quality Analytical Results

Sl.

No. Parameter Unit

Jorhat


Desirable

Drinking

Water

Limits as per

IS:10500

(2012)

GW 1 GW 2 GW 3 GW 4 GW 5

1. Colour Hazen <5.0 <5.0 <5.0 <5.0 <5.0 5-15

2. Temperature 0C 19.0 18.0 22.0 21.0 22 --

3. pH value - 7.7 8.2 6.9 7.1 7.9 6.5-8.5

4. Turbidity NTU 1.5 1.0 2.5 3.5 1.2 1-5

5. Conductivity @250C µS/cm 408 390 296 418 370 --

6. Total Dissolved Solids mg/l 282 242 215 221 315 500-2000

7. Calcium (as Ca) mg/l 62.1 63.8 58.2 51.4 72.5 75-200

8. Chloride (as Cl) mg/l 31.5 35 65 86 53 250-1000

9. Copper mg/l 0.012 0.023 0.008 0.009 0.011 0.05-1.5

10. Fluoride (as F) mg/l 1.15 1.02 0.96 0.85 0.78 1.0-1.5

11. Iron (as Fe) mg/l 1.8 2.1 1.7 1.5 2.2 0.3

12. Magnesium (as mg) mg/l 22.0 14.2 10.9 13.8 12.5 30-100

13. Nitrate (as NO3) mg/l 5 7.1 9.3 6.5 45

14. Total phosphate mg/l 0.5 0.8 0.5 0.7 0.6 --

15. Sodium (as Na) mg/l 2.0 2.0 1.0 2.0 3.2 --

16. Potassium (as K) mg/l 1.6 1.0 0.9 0.6 0.8 --

17. Phenolic Compound

(C6H5OH) mg/l <0.001 <0.001 <0.001 <0.001 <0.001 0.001-0.002

18. Sulphates (as So4) mg/l 38 51 49 35 53 200-400

19. Sulphides (as H2S) mg/l 0.012 0.003 0.011 0.021 0.009 0.05

20. Alkalinity mg/l 70.0 52.4 66.2 67.8 53.9 200-600

21. Total hardness mg/l 94.0 88.0 106 112 109 200-600

22. Total Suspended Solids mg/l 26.0 19.0 28.0 34.0 21.3 ---

23. Zinc mg/l 0.12 0.06 0.21 0.15 0.17 5-15

24. Cyanides mg/l 0.013 0.005 0.021 0.018 0.012 0.05



Sl.

No. Parameter Unit

Jorhat


Desirable

Drinking

Water

Limits as per

IS:10500

(2012)

GW 1 GW 2 GW 3 GW 4 GW 5

25. Lead mg/l 0.005 ND 0.009 ND 0.003 0.01

26. Mercury mg/l <0.001 <0.001 <0.001 <0.001 <0.001 0.001

27. Nickel mg/l 0.014 0.017 0.003 0.015 0.007 0.02

28. Arsenic mg/l 0.006 0.012 0.003 0.015 0.012 0.01-0.05

29. Chromium Total mg/l 0.02 0.009 0.034 0.043 0.026 0.05

30. Oil and grease mg/l <0.1 <0.1 <0.1 <0.1 <0.1 ---

31. Dissolved oxygen mg/l 2.1 2.2 2.5 3.4 2.9 --

32. Chemical Oxygen

Demand mg/l 8.9 12.3 9.8 8.8 9.5 ---

33. BOD (3.0 day at 270C) mg/l <0.2 <0.2 <0.2 <0.2 <0.2 ---

The results of ground water quality monitoring are summarized below:

The water samples were clear and transparent with little amount of turbidity (range: 1.0–

3.5 NTU, which is within the desirable drinking water limit).

pH of the samples was in the range of 6.9 to 8.2, which is within the prescribed drinking

water (DW) limit.

Electrical conductivity values varied in a wide range of 296μs/cm to 418μs/cm

indicating the presence of considerable amount of ionic matter in ground water.

Total dissolved solids (TDS) and Total Suspended Solids (TSS) was in the range of 215

to 315 mg/l and 19 to 34 mg/l, respectively. TDS was within the desirable DW limit.

Total hardness and Alkalinity were found in the range of 88 to 112 mg/l and 52.4 to 70

mg/l, respectively, which was within the DW limit.

Calcium, Chloride and Fluoride values varied in the range of 51.4 to 72.5 mg/l, 31.5 to

86 mg/l and 0.96 to 1.15 mg/l. The calcium and chloride and fluoride are under the

desirable DW limit.

The content of Magnesium, Nitrate, Total phosphate, Sodium and Potassium were in the

range of 10.9 to 22.0 mg/l, 5 to 9.3 mg/l, 0.5 to 0.8 mg/l, 1 to 3.2 mg/l and 0.6 to 1.6

mg/l, respectively.

Phenolic compounds, Oil & Grease, Mercury and Biochemical Oxygen Demand (BOD)

content of all samples are found below detection limit.

The iron, zinc, chromium total, copper, lead and nickel were in the range of 1.5 to 2.2

mg/l, 0.06 to 0.21 mg/l, 0.009 to 0.043 mg/l, 0.008 to 0.023 mg/l, 0.009 to 0.015 mg/l

and 0.003 to 0.017 mg/l, respectively. Iron levels in groundwater are also naturally high,

which is also reported by CGWB.

Sulphide, Arsenic and Cyanides were found within the desirable DW limit.

Chemical Oxygen Demand (COD) and Sulphate were in the range of 8.8 to 12.3 mg/l

and 33 to 53 mg/l, respectively.

Dissolved Oxygen was in the range of 2.1 to 3.4 mg/l.



Table 3.9: Surface Water Quality Analytical Results

Sl.

No. Parameter Unit

Golaghat District Desirable

Drinking

Water Limits

as per IS:

10500 (2012)

SW 1 SW 2 SW 3 SW 4

1. Colour Hazen <5.0 <5.0 <5.0 <5.0 5-15

2. Temperature 0C 22.6 20.0 23.0 22.8 --

3. pH value - 8.5 8.3 8.4 7.9 6.5-8.5

4. Turbidity NTU 1.6 1.9 1.2 1.4 1-5

5. Conductivity @250C µS/cm 190 173 186 178 --

6. Total Dissolved Solids mg/l 108 204 142 227 500-2000

7. Calcium (as Ca) mg/l 82 155 94 63 75-200

8. Chloride (as Cl) mg/l 123.4 147.7 128.3 152.5 250-1000

9. Copper mg/l 0.013 0.006 0.009 0.032 0.05-1.5

10. Fluoride (as F) mg/l 0.38 0.87 0.19 0.21 1.0-1.5

11. Iron (as Fe) mg/l 0.23 0.19 0.14 0.16 0.3

12. Magnesium (as mg) mg/l 22.0 22.3 25.5 21.4 30-100

13. Nitrate (as NO3) mg/l 2.45 3.18 3.91 5.23 45

14. Total phosphate mg/l 0.04 0.55 0.18 0.34 --

15. Sodium (as Na) mg/l 12.4 57.0 28.0 46.2 --

16. Potassium (as K) mg/l 1.1 20.2 2.6 3.2 --

17. Phenolic Compound

(C6H5OH) mg/l <0.001 <0.001 <0.001 <0.001 0.001-0.002

18. Sulphates (as So4) mg/l 87 48 37 89 200-400

19. Sulphides (as H2S) mg/l 0.037 0.015 0.029 0.031 0.05

20. Alkalinity mg/l 164 115 145 122 200-600

21. Total hardness mg/l 132 106 128 109 200-600

22. Total Suspended solids mg/l 21 47 32 26 ---

23. Zinc mg/l 0.63 0.85 0.73 0.29 5-15

24. Cyanides mg/l 0.009 0.034 0.021 0.027 0.05

25. Lead mg/l 0.016 0.034 0.014 0.012 0.01

26. Mercury mg/l <0.001 <0.001 <0.001 <0.001 0.001

27. Nickel mg/l 0.013 0.008 0.017 0.006 0.02

28. Arsenic mg/l 0.017 0.009 0.008 0.016 0.01-0.05

29. Chromium Total mg/l 0.015 0.026 0.018 0.021 0.05

30. Oil and grease mg/l <0.1 <0.1 <0.1 <0.1 ---

31. Dissolved oxygen mg/l 7.6 5.2 5.7 7.1 --

32. Chemical Oxygen

Demand mg/l 13.0 15.0 18.0 23.0 ---

33. BOD (3.0 day at 270C) mg/l 3.0 4.0 3.0 5.0 ---

The data can be summarized as follows:

The surface water samples had less than 5 Hazen units of colour.

The amount of turbidity varied in the range of 1.2 – 1.9 NTU which is within the

desirable limit.

pH of the samples was found little alkaline in nature, it ranges between 7.9 to 8.5.

Electrical conductivity values varied in a wide range of 173 μs/cm to 190μs /cm

indicating the presence of considerable amount of ionic matter in surface water bodies.



Total dissolved solids (TDS) and Total suspended solids (TSS) was in the range of 108

to 227 mg/l and 21 to 47 mg/l, respectively. TDS was within the DW limit.

Total hardness and Alkalinity were found in the range of 106 to 132 mg/l and 115 to

1164 mg/l, respectively, which were also within the DW limit.

Calcium, Chloride and Fluoride values varied in the range of 155 to 82 mg/l, 152.5 to

123.4 mg/l and 0.87 to 0.19 mg/l, were also within DW limit.

The content of Magnesium, Nitrate, Total phosphate, Sodium and Potassium were in the

range of 22 to 25.5 mg/l, 2.45 to 5.23 mg/l, 0.04 to 0.55 mg/l, 12.4 to 57 mg/l and 1.1 to

20.2 mg/l, respectively.

Phenolic compounds, Oil & Grease and Mercury content of all samples are below

detection limit.

The iron, zinc, chromium total, copper, lead and nickel were in the range of 0.14 to 0.23

mg/l, 0.29 to 0.85 mg/l, 0.015 to 0.026 mg/l, 0.006 to 0.032 mg/l, 0.012 to 0.034 mg/l

and 0.008 to 0.017 mg/l, respectively.

The samples of Sulphate, Sulphide, Arsenic and Cyanides were within the desirable DW

limit.

Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD) and Chemical Oxygen

Demand (COD) were in the range of 5.2 to 7.6 mg/l, 13 and 23 mg/l and 3.0 to 5.0 mg/l,

respectively.

Analytical results indicate the absence of pollution in these water sources both industrial and

domestic pollution. This is also evident from the surrounding land use land cover, which is

deviated from anthropogenic activities in the areas, the oil field and its surroundings

3.4.7 Air Environment

The ambient air quality was monitored at eight locations. The following criteria were taken

into account while selecting the monitoring location: accessibility, topography, security,

availability of reliable power supply, dominant wind direction and even distribution of

sampling locations in the study area. The main sources of air pollution in the study area are

vehicular emission and ongoing processing/production operations and domestic requirements.

The AAQM sampling locations are listed in Table 3.10 and shown in Figure 3.17.

Table 3.10: Location Details for Ambient Air Quality Monitoring

Sl.

No. Location

Code Name of the Location Coordinates

Jorhat District

1 AQ1 Silldubi Village 26027’02.5”N 94 010’33.2”E

2 AQ2 Gorajan Village 26026’47.0”N 94 009’45.2”E

Golaghat District

3 AQ3 Near Well Lakhibari 26022’05.6”N 94 002’58.8”E

4 AQ4 Gelajan Village 26003’25.0”N 93 053’42.6”E

5 AQ5 Raajpokhri Village 26003’28.1”N 93 053’58.6”E

6 AQ6 Haldibari Village 26005’02.3”N 93 057’03.2”E

7 AQ7 GGS-II 26005’10.1”N 93 057’13.9”E

8 AQ8 CRPF Camp 26004’01.5”N 93 055’59.2”E



Figure 3.17: Ambient Air Quality Monitoring Location Map



3.4.7.1 Parameters, Frequency and Monitoring Methodology

The following parameters were measured during the ambient air quality monitoring:

Particulate Matter (PM10)

Sulphur Dioxide (SO2)

Nitrogen Dioxide (NOX)

Methane

Non-methane hydrocarbons

Volatile Organic Compounds (VOCs)

Ambient air quality monitoring for the above parameters was conducted adopting a 24-hours

schedule. The equipment was placed at open space free from trees and vegetation which

otherwise acts as a sink of pollutants resulting in lower levels in monitoring results. At

locations close to highways, the equipment was placed at least 100 m away from such

highways/roads to avoid influence of traffic exhaust emissions.

High Volume cum Respirable Dust Sampler was used to collect samples for the analysis of

PM10, PM2.5, SO2 and NOX. Glass micro-fibre filter papers (GFA Sheets, Whatman) were

used for the collection of Particulate Matter. Impingers with fixing solutions were used for the

qualitative as well as quantitative analysis of SO2 and NO2. The method of analysis for

different air quality parameters are given in Table 3.11.

Table 3.11: Method of Analysis for Different Air Quality Parameters

Parameters Method of Measurement

PM10 Gravimetric

SO2 Improved West and Gaeke

NOX Modified Jacob & Hochheiser (Na-Arsenite)

HC GC-FID with propane N Column

VOC GC-FID with Methanizer

Monitoring and analysis of Hydrocarbons and VOC were conducted at eight locations as per

the requisite of TOR approved by the MoEF. Photo Plate 3.5 shows the air quality

monitoring at different locations in the study area.



AAQ Monitoring at Borholla AAQ Monitoring at East Lakhibari

AAQ Monitoring at Nambar AAQ Monitoring at Nambar

AAQ Monitoring at Khoraghat GGS II AAQ Monitoring at Khoraghat Ext.

Ghulapani

Photo Plate 3.5: Ambient air quality monitoring



3.4.7.2 Ambient air quality in the study area

Particulate Matter

The 24-hourly average of PM10 levels were varied station wise between 39.7µg/m3 and

64.4µg/m3, which were within the NAAQS standards, 2009. The summary of PM10 monitored

in the study area is given in Table 3.12. The PM10 levels were well below the permissible

limits (NAAQS, 2009 limit of 100µg/m3). The dust generating out of the site for any activity

specifically for ground cleaning and top soil removal for new bore hole would dissipate quite

well without resulting to any gross dust (particle matter) pollution.

Table 3.12: Summary of PM10 Levels Monitored in the Study Area

Location

Code Name of the Location

Area

Category

24-hourly Average PM10

(μg/m3)

Monitored

Value

Limit as per

NAAQS

Jorhat District

AQ1 Silldubi Village Residential 43.5 100

AQ2 Gorajan Village Residential 39.7 100

Golaghat District

AQ3 Near Well Lakhibari Industrial 62.2 100

AQ4 Gelajan Village Residential 59.4 100

AQ5 Rajpokhri Village Commercial 53.1 100

AQ6 Haaldibri Village Residential 56.3 100

AQ7 GGS-II Industrial 64.4 100

AQ8 CRPF Camp, Ghulapani Residential 48.4 100

Sulphur Dioxide (SO2)

The analytical result of SO2 value reveals that the concentration of SO2 is within the

prescribed standard limits of NAAQS, 2009 at all the locations. The area being mostly

covered with forests with very little industrial activities, the SO2 levels are expected to be low

as shown in Table 3.13.

Table 3.13: Summary of SO2 Levels Monitored in the Study Area

Location


Area

Category

24-hourly Average SO2

(μg/m3)

Monitored

Value

Limit as per

NAAQS

Jorhat District



Golaghat District









Nitrogen Dioxide (NOX)

The 24-hourly NOx level over the entire study area measured at the eight monitoring stations

ranged between 9.24µg/m3 to 16.53µg/m3. The data depicted that the concentration of oxides

of nitrogen at all the stations are well within the prescribed limits as summarized in Table

3.14.

Table 3.14: Summary of NOX Levels Monitored in the Study Area

Location


Area

Category

24-hourly Average NOx

(μg/m3)

Monitored

Value

Limit as per

NAAQS

Jorhat District



Golaghat District







Volatile Organic Compounds (VOC)

The concentration observed was below detection limit as shown in Table 3.15 below. The

detection limit of the instrument used for analyzing VOC in the samples was 0.1 g/m3.

Table 3.15: Summary of VOC Levels in the Study Area

Location


Area

Category

Observed 24-hourly

Average VOC (μg/m3)

Jorhat District

AQ1 Silldubi Village Residential BDL

AQ2 Gorajan Village Residential BDL

Golaghat District

AQ3 Near Well Lakhibari Industrial BDL

AQ4 Gelajan Village, Residential BDL

AQ5 Rajpokhri Village Commercial BDL

AQ6 Haaldibri Village Residential BDL

AQ7 GGS-II Industrial BDL

AQ8 CRPF Camp, Ghulapani Residential BDL

BDL: Below Detection Limit (0.1 μg/m3)

Hydrocarbons (HC)

The sampling of HC was carried out. The analyzed concentrations of Methane and Non-

Methane Hydrocarbons are tabulated in Table 3.16.



Table 3.16: Summary of HC Levels in the Study Area

Location


Area

Category

Observed 24-hourly

Average HC (μg/m3)

Methane Non-Methane

Jorhat District

AQ1 Silldubi Village Residential 0.79 0.62

AQ2 Gorajan Village Residential 0.95 0.23

Golaghat District

AQ3 Near Well Lakhibari Industrial 1.9 0.77

AQ4 Gelajan Village Residential 0.89 0.63

AQ5 Rajpokhri Village Commercial 1.24 0.38

AQ6 Haaldibri Village Residential 0.89 0.48

AQ7 GGS-II Industrial 2.1 1.0

AQ8 CRPF Camp,

Ghulapani

Residential 1.02 0.60

3.4.8 Noise Environment

Major sources of noise in the study area include:

Noise made by drilling and completion activities.

Noise made by well pumps and compressors.

Noise made by normal human activities.

Noise made by vehicles, trucks, etc.

Noise made by occasional operation of pumps in the agricultural fields, etc; and

Natural noise, consisting of sounds made by birds, animals and insects.

The purpose of noise monitoring at different locations is to obtain baseline noise levels for

future reference.

3.4.8.1 Ambient Noise Monitoring

Ambient noise monitoring was conducted to assess the background noise levels in the study

area. A total of 8 locations within the study were selected for the measurement of ambient

noise levels. Noise monitoring was carried out on a 24-hour basis to assess the baseline noise-

levels and to evaluate the impact, if any. The locations selected for the study are given in

Table 3.17 and shown in Figure 3.18. Photo Plate 3.6 shows the noise quality monitoring at

different locations in the study area. The monitoring results are given in Table 3.18, followed

with the graphical representation in Figure 3.19 and Figure 3.20.

Table 3.17: Location of Noise Monitoring Locations

Sl.

No.

Location


Jorhat District

1 N1 Near Borholla GGS 260 27’ 02.0”N 940 10’ 32.4”E

2 N2 Near Primary School in

Silldubi Village

260 26’ 51.5”N 940 10’ 30.41”E



Sl.

No.

Location


Golaghat District

3 N3 Near Well Lakhibari 260 22’ 07.2”N 940 02’ 58.1”E

4 N4 Gelajan Village 260 03’ 24.2”N 930 53’ 42.8”E

5 N5 Raajpokhri Village 260 03’ 28.9”N 930 53’ 58.6”E

6 N6 Haldibari Village 260 05’ 01.1”N 930 57’ 03.2”E

7 N7 GGS-II 260 04’ 47.2”N 930 56’ 56.2”E

8 N8 Ghulapni 260 04’ 01.5”N 930 56’ 03.0”E


__________________________________________________________________________________________________________________________________


Figure 3.18: Ambient Noise Quality Monitoring Location Map



Noise level Monitoring at Borholla Block

Noise level Monitoring at East Lakhibari

Block

Noise level Monitoring at Nambar Block Noise level Monitoring at Nambar Block

Noise level Monitoring at Khoraghat Block Noise level Monitoring at Khoraghat Ext

Block

Photo Plate 3.6: Noise level Monitoring at Different Locations in Study Area

3.4.8.2 Methodology

Ambient noise level or sound pressure levels (SPL) were measured by a portable sound level

meter having built in facilities to read noise level directly in dB (A). A-weighted equivalent

continuous sound pressure level (Leq) values were computed from the values of A-weighted

SPL measured with the help of noise meter. Noise Measurement was conducted by noise



meter. At each location, noise monitoring was conducted continuously over a period of

twenty-four hours to obtain Leq values at uniform time intervals of one hour.

Day time Leq has been computed from the hourly Leq values between 6.00 a.m. and 10.00 p.m.

and night time Leq from the hourly Leq values between 10.00 p.m. and 6.00 a.m. using the

following formula:

Where, Li = Leq value of the ith hourly time interval

Table 3.18: Summary of Ambient Noise levels Monitored in the Study Area

Location

Code Name of the Location Area Category

Day Night

Leq Limit Leq Limit

Jorhat District

N1 Near Borholla GGS Residential 43.6 55 32.5 45

N2 Near Primary School in

Silldubi Village

Residential 41.5 55 30.0 45

Golaghat District

N3 Near Well Lakhibari Industrial 65.3 75 55.7 70

N4 Gelajan Village Residential 45.8 55 31.1 45

N5 Raajpokhri Village Commercial 50.5 65 41.5 55

N6 Haldibari Village Residential 42.9 55 32.3 45

N7 GGS-II Industrial 67.8 75 59.8 70

N8 Ghulapani Residential 43.6 55 34.7 45

Area Category: I-Industrial, C-Commercial, R-Residential, S-Silence zone

Day time: 6.00 a.m. to 10.00 p.m. Night time: 10.00 p.m. to 6.00 a.m

Permissible Ambient Noise standards in dB (A):

Industrial Area: Day time: 75 Night time: 70

Commercial Area: Day time: 65 Night time: 55

Residential Area: Day time: 55 Night time: 45

Silence Zone: Day time: 50 Night time: 40

16

1

101016

1log10

i

L

eq

i

dayL

8

1

10108

1log10

i

L

eq

i

nightL



Figure 3.19: Ambient Noise Levels Monitored in the Study Area (Day time)

Figure 3.20: Ambient Noise levels monitored in the study area (Night time)

3.4.8.3 Analysis of the Data

Assessment of noise level was carried out at 8 locations to evaluate the ambient noise levels

and possible impacts due to project activities. The values of noise level, which were recorded,

were in the range of 41.5 - 67.8 dB (A) during daytime and 30.0 – 59.8 dB (A) at night time.

The noise level was well within the permissible limit as per the NAAQS.

3.4.9 Biological Environment

The natural vegetation comprises tropical moist and dry deciduous forests. In view of the high

rainfall, the cropping system is rice based. The main crops of rainy season (Kharif) grown

under rainfed condition are rice and jute beside this tea is also cultivated in large area.

0

10

20

30

40

50

60

70

80

NQ1 NQ2 NQ3 NQ4 NQ5 NQ6 NQ7 NQ8

Nois

e L

evel

dB

(A

)

Monitoring Stations

Leq Day dB (A)

Leq Day dB (A)

Limit Day dB (A)

0

10

20

30

40

50

60

70

80

NQ1 NQ2 NQ3 NQ4 NQ5 NQ6 NQ7 NQ8

Nois

e L

evel

dB

(A

)

Monitoring Stations

Leq Night dB (A)

Leq Day dB (A)

Limit Day dB (A)



3.4.9.1 Terrestrial Environment

Flora

The floristic composition of the Golaghat and Jorhat district is very rich; most of the plants

are tropical evergreen and semi-evergreen variety. Secondary data obtained from the Forest

department was evaluated to assess the floristic structure of the study area. Major tree species

found in the area are Sida, Dimaru, aam, segun, Nahar, bel etc. Table 3.19 and Table 3.20

presents list of important flora in the Golaghat and Jorhat districts respectively. The list of

medicinal plant in Jorhat district area is given in Table 3.21. Photo Plate 3.7 shows the

observed vegetation and surroundings of the study area.

Table 3.19: List of Important Flora in the Golaghat District

No. Scientific Name Common Name

A. Tree

1. Acaciaauriculoformis Moj

2. Aegle marmelos Bel

3. Albizia lucida Silkarai

4. Albizia odoratissima Siris

5. Albizia procera KaloSiris

6. Alianthus grandii Borpat

7. Alibiizalebbeck Sirish

8. Alistonia scholaris Satiana

9. Annona squamosa Atlas

10. Anthocephalussinensis Kadam

11. Arecacatachu Tambol

12. Artocarpusintergifolia Kathal

13. Azadirachtaindica Mahaneem

14. Bauhiniavariegata Kanchan

15. Biscofiajavanica Uriam

16. Bombaxceiba Simalu

17. Borassusflabellifer Tal

18. Butea monosperma Palas

19. Caeslpiniapulcherima Krishnasura

20. Camelliasinensis Cha

21. Cassiafistula Shonaru

22. Cassiasiamea Seemia, Kassod

23. Cayeaarborea Kum

24. Ceiba pentendra SwetSimul

25. Cocoosnucifera Narikal

26. Dalbergiasissoo Sisu

27. Delonixregia Radhasura

28. Dilleniaindica Outenga

29. Erythrinavariegata Modar

30. Euclyptussp. Safeda

31. Eugeniapracco Bogijamu

32. Ficusbengalensis Bat

33. Ficushispida Ingthum

34. Gmelinaarborea Gameri

35. Litchichinensis Lichi

36. Mangiferaindica Aam

37. Meliaazedarch Ghoraneem

38. Mesuaferrea Nahar




39. Micheliachampaca Titachopa

41. Mimusopselengi Bokul

42. Peltophorum pterocarpum Radhachura

43. Phoenixsylvestris Khejur

44. Pterospermum acerifolium Kanakchampa

45. Phyllanthusembilica Amla

46. Plumariaacutiafolia Katgolap

47. Polyalthialongifolia Debadaru

48. Pongamiapinnata Karach

49. Psidium gujava Madhuriam

50. Punicagrantum Dalim

51. Sesbaniagrandiflora Bakphul

52. Syzygium cumini Kalajam

53. Saracaindica Asoka

54. Tectonagrandis Segun

55. Terminaliaarjuna Arjun

56. Tamarindusindica Tetuli

57. Tetramelesnudiflora Bhelu

58. Terminaliachebula Silikha

59. Trewa nudiflora Gute

60. Zizyphusjujuba Jujube

B. Shrubs 61. Abutilonindicum Indian Mallow

62. Adhatodazeylanica Jok-an-kelok

63. Antidesmusacidum Ingchum

64. Bambusaarundinacea Mokal Baansh

65. Bambusavulgaris Common bamboo

66. Bambusatulda Spineless Indian Bamboo

67. Bambusabalcooa Homestead bamboo

68. Bambusanana Hairy jointgrass

69. Dendrocalamussp Male or Solid bamboo

70. Calamusrotang Pri

71. Clerodendrumindicum Bapnem-ai

72. Clerodendrumserratum Phelang-riho

73. Murrayakoenigii Thengsakso

74. Nyctanthesarbor-tristis Hewali

75. Olaxacuminate Hanboka

76. Paederiafoetida Rekang

77. Persicariamicrocephala Delap

78. Phlogacanthustubiflorus Jok-anke-et

79. Solanumspirale Jok-ho

80. Solanumtorvum Theso-rongman

81. Vitexnegundo Vorke

82. Hibiscusrosa-sinensis Jaba

83. Hibiscusvitifolius Bon-kapas

84. Ixoracoccinea Rangan

85. Jatrophacurcus Physic Nut

86. Lantanacamera Lantana weed

87. Neriumindicum Karabi

88. Nyethenthesarbortristis Sewali

89. Ricinuscommunis Rehri

90. Thevetiaperuviana Kolkey




C Herbs

91. Alocasiamacrorrhiza Henchala

92. Alternantherasessilis Raeaba

93. Amorphophalusbulbifer Hensaluki

94. Arisaematortuosum Chamua

95. Beta vulgaris Belgalidido

96. Cassiatora Bapduli

97. Chenopodium album Churu

98. Commelinabenghalensis Kurveng

99. Curcumaamada Tharmittharve

100. Drymariacordata Kur-vengso

101. Ensetesuperbum Lobong

102. Homalomenaaromatic Okhiatehang

103. Hydrocotylesibthorpoides Chongamok

104. Lasisspinosa Henruehong

105. Leucasaspera Chanrongaan

106. Oxaliscorniculata Vothungmekbop

107. Physaliaperuviana Thebong-kang

108. Portulacaoleracea Chitu

109. Portulacaquadrifida Vothungmekvoke-er

110. Solanum nigrum Pharchingki

111. Tageteserecta Mirkadomphui

112. Xanthium strumarium Parakhanthor

D Climbers

113. Abrus precatorius Coral bead vine

114. Cissusquadrangularis Repichingthun

115. Deeringiaamaranthoides Hanthai

116. Dioscoreaesculenta Ruiphengselu

117. Dioscoreapentaphylla Ruipheng

118. Dioscoreapuber Rui-chilong

119. Ipomesbatatas Ruidok

120. Clitoreatenata Aparajita

121. Cuscutreflexa Akashilata

122. Mikaniascandens Nag

123. Paederiafoetida Bhedailata

Table 3.20: List of Important Flora in the Jorhat District

Sr. No. Common Name Botanical Name

A. Trees

1 Aam Mangifera indica*

2 Aatha Annona squamosa*

3 Agar Aquilaria agallocha

4 Amlaki Phyllanthusemblica*

5 Arahar Gajanusindicus

6 Asoka Saracaindica*

7 Auri Acacia auriculoformis*

8 Awal Vitex penduncularis,

Stereospermumcholonides

9 Babla Gaach Acacia nilotica*

10 Baghachrailata Dalbergiastipulacea

11 Bahera Terminalia belerica*

12 Balati /amli Pithecelobium dulce*




13 Baut Gaach Ficusbengalensis*

14 Bel Aegle marmelos*

15 Bish-lata Millettia psehycarpa

16 Boga-medoloa Tephrosia candida

17 Chalta Dilleniaindica*

18 Chamal Artocarpuschaplasha

19 Chandul (maina,rairal) Tetramelesnudiflora

20 Chatiwan Alstonia scholaris

21 Debdaru Polyalthia longifolia*

22 Dhup Canarium bengalense

23 Garjan Dipterocarpusturbinatus*

24 Gorak-narikel

(Bandarpela, Cach)

Sterculia alata

25 Gulmohar Delonixregia*

26 Haldu Adina cordifolia*

27 Haludehaki Adina sessilifolia*

28 Harguza Dillenia pentagyna*

29 Harish Albizzia stipulata*

30 Haritaki Terminalia chebula*

31 Hizal Barringtonia acutangula

32 Jam, geda Eugenia operacalta

33 Jam, kala Eugenia jambolana*

34 Jam, tita Eugenia cymosa

35 Jinari Premnabengalensia

36 Jinari Premnabarbata

37 Jiol Odina wodier

38 Kadam Anthocephalusindicus*

39 Kajikara Garugapinnata

40 Kaju Anacardium occidentale*

41 Kajur Phoenixsylvestris

42 Kanta-kui Brideliaretusa

43 Kanthal Artocarpusheterophyllus*

44 Karai, Siris Albizzia procera*

45 Karanj Pongamia pinnata*

46 Kendu Diospyros melanoxylon*

47 Kheta (chegarashi) Chukrasia tabularis

48 Kul Zizyphusjujuba*

49 Lakshmi Mangiferasylvatica

50 Lichu Litchi chinensis*

51 Mahogany Swietenia mahogeni

52 Mandar Erythrina suberosa

53 Mera (medda) Trewia nudiflora

54 Minijiri Cassia siamea

55 Nageswar Mesua ferrea

56 Narikel Cocosnucifera*

57 Neem Azadirachta indica*

58 Nilgiri Eucalyptus*

59 Nour Burseraserrata

60 Padauk Pterocarpusindicus

61 Palas Butea monosperma*

62 Pani Terminalia myriecarpa

63 Piara Psidium guajava*




64 Pipal, Ashathya Ficusreligiosa*

65 Pitraj(rahena) Ammoorarohituka

66 Poma (rangi) Cedrela toona

67 Poma, markatya Schleicheratrijuga

68 Pyinkade Xylia dolabriformis

69 Rabar Ficuselastica*

70 Rata (lali) Amoorawalichii

71 Saal Shorearobusta*

72 Sapeda Manilkara zapota*

73 Segun Tectonagrandis*

74 Simul Salmalia malabarica,

Bombaxmalabaricum*

75 Sissoo Dalbergiasissoo*

76 Sonal Cassiafistula*

77 Supari Areacacatechu

78 Taal Borassusflabellifer*

79 Tejpat Cinnamomum tamala

80 Tetul Tamarindusindica*

81 Udal Sterculiavillasa

82 Umber Ficusracemosa*

83 Urium Bischofiajavanica

B Shrub

84 Aakanda Calotropisprocera*

85 Bajna Zanthoxylumbudrunga

86 Bankadam Hymenodictyon excelsum,Wall

87 Bans, barak (barua) Bambusabaleeoa*

88 Bans, Kalyai Oxytenanthera nigrocilista*

89 Bans, Kanak-kai Bambusaoffinis*

90 Bans, Makal Bambusapallida,Munro*

91 Bans,Mitinga Bambusatulda*

92 Bans,Muli Melocanna bambusoides

93 Bans,Parwa Bambusateres*

94 Barai, ban Zizyphusrugosa*

95 Bunotulsi Hyptissuaveolens*

96 Bush Morning Glory Ipomeafistulosa*

97 Cascabela thevetia Thevetiaperuviana*

98 Cha, Chai Camellia sinensis*

99 Gokru Xanthium stromarium

100 Jaba Phool Hibiscusrosa-sinensis*

101 Jungle flame Ixora*

102 Kul Zizyphusmauritiana*

103 Laantana Lantana camara*

104 Lagundi Vitexnegundo*

105 Malbar nut Adhatodavasica*

106 Oleander Neriumodorum*

C Herbs

107 Bandar-hola Mucuna pruriens

108 Bans, Pocha Dendrocalamushamiltono*

109 Bansrupai(orah) Dendrocalamuslongispathus

110 Bata Erianthusravennas

111 Binna (khus-khus) Andropegon squarrrous

112 Chaff flower Achyranthes aspera*




113 Chhan Imperatearundinacea,*

114 Common Sida Sida acuta*

115 Dhutra Datura metal*

116 Hogla Typhaelephantina.*

117 Indian Mallow Abutilon indicum*

118 Khagra Saccharumspontaneum

119 Puma Toon Tridaxprocumbens*

120 Sessile joy weed Alternanterasessilis

121 Sunti Curcumaspp.

122 Til Sesamumindicum

123 Wild Indigo Tephrosia hamiltonii*

E Climbers

124 Agarbel Millettia auriculata

125 Maula Spatholobusroxburghii

126 Pivarbel Combretumdecandrum

127 Sonbel Bauhinia vahlii*

F Parasites

128 Amarbel Cuscuta reflexa*

Source: State forest department Jorhat, Assam;*Observed during survey

Table 3.21: List of Important Medicinal Plant in the Jorhat District

Sr. No. Local Name Parts used Flowering and Fruiting

1 Ulakambal& Banlopali Root, bark, June-December

2 Kunch Root and seed April-February

3 Petari Leaves, barks, juice of leaves,

seed and root,

October-February

4 Banritha Pod and leaves February-March

5 Buktajari Plants, roots and leaves -

6 Apang Plants, roots and seeds July-March

7 Bach Rhizome Not seen

8 Bakast and Vasaka Leaves, roots and flowers December-May

9 Bel Root-bark, fruit April-March

10 Pichas Root leaves and flowers. October-February

11 Nagakala Leaves April-February

12 Kaju badam Roots, barks and fruits April-February

13 Kalmegh Plant, roots and leaves Winter

14 Kadam Bark, leaves Rains winter

15 Anaras Leaves and fruits -

16 Nona Bark, leaves and seeds July-March

17 Agar Wood Rainy season

18 Shialkata Root, juice and seeds Winter

19 Satamuli Root, Winter

20 Kam-ranga Fruit August-March

21 Brahmisk Plant, stem and leaves October

22 Danti Root, leaves and seeds Throughout the year

23 Kanchan Bark and flowers -

24 Kukursanga Whole plant February-March

25 Kukur-sanga Plant, roots and leaves December-April

26 Jong-obi Bark and root August–March

27 Naud Plant and leaves In rains

28 Nata Bark, leaves and seeds Winter



Sr. No. Local Name Parts used Flowering and Fruiting

29 Lataphatakri Plant December-April

30 Kalkasunda Plant, roots, leaves and seeds July-April

31 Chakunda Root, leaves and seeds Rains- winter

32 Kalkashunda Plant, leaves and seeds Rain-winter

33 Thunimankuni Plant and leaves; very common

throughout the state

December-July

34 Bethshag Plant December-April

35 Bethushag Plant Throughout the year

36 Akanadi Leaves and seeds October

37 Hoorhuria Leaves and seeds Throughout the year

38 Jangli-Darchini Bark and seeds December

39 Bhai Root and leaves December-July

40 Bhait Juthur Roots, leaves and flowers February-May up to July

41 Telakucha Plant, root and leaves Hot period

42 Huyer Root and leaves January

43 Titapati Seeds Rainy season

44 Kalauja Fruits, bark and leaves Rain-winter

45 Barun Bark and leaves April-December

46 Baragach Bark, roots, fruits and seeds December-June

47 Jhunjhuni Stem, leaves and seeds December-April

48 Talamuli Throughout the state Rains up to winter

49 DhubhDurba Plant, Rains

50 Sunda Tubers September-January

51 Dhutura Roots, leaves and seeds Rainy season

52 Dhutura Leaves and fruits Rainy season

53 Chprialu Tubers Upto winter

54 Banalu Tubers August-November

55 Garur Plant, rhizome and fruits -

56 Kesuti Plants, roots, leaves and juice July-January

57 Anola Root, bark, flowers and fruits January-December

58 Tappa-changue Bark November-December upto April

59 Ghila Seeds stem and bark flowers 1st part of the second year

60 Pichas Plant Winter

61 Ayapana Stem and leaves July-March

62 Barokhernie Leaves and seeds -

63 Dudiya Leaves and seeds Throughout the year

64 Bot Root, fibers, leaves, milky juice

and seeds

Winter-rains

Aegle marmelos (Bael) Mangifera indica (Aam)



Tectona Grandis (Sagun) Sida Acutaa

Tea cultivation in study area Paddy cultivation in study area

Photo Plate 3.7: Local Vegetations and Surroundings of the Study Area

Fauna

Major domestic animals in the study area are goat, sheep, buffalo, pig, horse etc. Common

wild fauna are Swamp Deer, Butterflies, Honeybee, Great Indian Hornbill, Bengal Florican,

White wing Wood Duck, etc. The list of important fauna in Golaghat and Jorhat districts area

is given in Table 3.22 and Table 3.23 respectively.

Table 3.22: List of Important Fauna in the Golaghat District

Name Common Name Name in Assamese Scientific Name

A Mammals

1 Indian Elephant Hati Elephas maximus

2 Tiger Bagh Panthera tigris

3 Gaur (Indian Bison) Methun Bos gaurus

4 Leopard Nahor Phutuki Bagh Panthera tigris

5 Sambar Hor Pohu Cervus unicolor

6 Barking Deer Hugori Pohu Muntiacus muntjak

7 Ant Eater Bon roh Manis crassicaudata

8 Hares Hoha Pohu Lupus nigricallis

9 Flying Squirrel Bonoria Kerketuva Dremnomys lokriah

10 Mangoose Neoul Herpestes edwardsi

11 Tiger Civet Cat Lota Mekuri Bagh Felis chaus



Name Common Name Name in Assamese Scientific Name

12 Slow Loris Lajuki Bandor Nycticebus ceucang

13 Hog Deer Khotia Pohu Axis porcinus

14 Wild Pig Bonoria Gahori Sus scrofa

15 Civet Cat Johamal Viverra zibetha

16 Monkey (Langoor) Honuman Bandor Presbytis entellus

17 Monkey (Rhesus ) Moluva Bandor Macaca mulatta

18 Porcupine Ketala Pohu Hystrix indica

19 Jackal Hiyal Canis aureas

20 Otter Ud Lutra lutra

21 Sloth Bear Matir bhaluk Melursus ursinus

22 Himalayan Black Bear Himalayan Kola Bhaluk Selenarctos thebetanus

23 Honey Bear Gos Bhaluk -

24 Swamp Deer Dol Horin Cervus duvauceli

25 Wild Dog Rang kukur -

26 Hoolock Monkey Holoh Bandor Hylobates hoolock

27 Bat Baduli Various spp.

B Reptiles

28 King Cobra Sokori Pheti Hap Dphiophagus hannah

29 Cobra Pheti Hap -

30 Python Ajogor -

31 Monitor Lizard Guie Veranus bengalensis

32 Golden Lizard Hoon Guie -

C Birds

33 Imperial Pigeon Parghuma Sorai Docula aenea

34 Green Pigeon Haisa Sorai Treron bicincta

35 Jungle Fowl Bonoria Kukura Gallus gallus

36 Pheasant Dorik Lophura leucomelana

37 Qual Bota Sorai Apus apus

38 Whistling Teal Horali Hah Debdrocynga javanica

39 Cotton Teal Pani Hah Nettapus

40 Plover Bali Mahi Coromandelianus

41 Great Hornbill Raj Dhoneh Vanellus vanellus

42 Hawk Hen Sorai Falco peregrinus

43 Crow Kauri Corvus macrorhynchos

44 Magpies Dohikotora Copsyehus saularis

45 Hill Myna Maina Gracula religiosa

46 Parrot Bhatoh Psittacula krameri

47 Horn Bill Dhoneh Anthracocerusmalabaricus

48 Racket Tailed Dronge Bhim Raj Diccrurus paradiseus

49 Rock Dove Hil Kopoh Columbar livia

50 King Crow Phesu Dicrurus Adsimilis

(Source: Primary Survey & ENVIS Centre Assam, MoEF, GoI)



Table 3.23: List of Important Fauna in the Jorhat District

No. Common Name Scientific Name

A Mammals

1 Hoolock Monkey Hylobates hoolock

2 Bengal Monkey Macaca rhesus

3 Stump tailed monkey M. arctoides

4 Barbers leaf monkey Semnopithecusphayrei

5 Slow Loris Nycticebusbengalensis

Carnivores

6 Leopard Panthera pardus

7 Jungle ct Felis chaus

8 Leopard cat Felis bengalensis

9 Small Indian Civet Viverricula indica

10 Large Indian Civet Viverricula zibetha

11 Common Indian Mongoose* Herpestesedwardsii

12 Indian wolf Canislupus

13 Indian wild dog Cuondukhunensis

14 Indian fox Canisbengalensis

15 Jackals Canisaureus

16 Common otter Lutra lutra

17 Sloth bear Melursusursinus

Insectivore

18 Grey musk shrew Crociduracaerulea

Chiropteran

19 Common flying fox of India Pteropusmedius

Rodent

20 Large Indian squirrel * Sciurus indicus

21 Large Malay squirrel S. Bicolo

22 Large bamboo rats Rhysemys spp.

23 Common rats * Musratus

24 Indian porcupine Hystrixleucura

25 Rabbit * Oryctolagus cuniculus

Ungulate

26 Indian elephants Elephasmaximus

27 Indian Bison Bosfrontalis

28 Sambar deer Cervus-Rusaunicolor

29 Barking deer Muntjacus-cervulusmuntjac

30 Wild boar Suscristatus

31 Indian pangolin Manispentadactyla

B Aves (Birds)

32 The common house crow * Corvussplendens

33 Jot-black jungle crow * C.macrorhynchos

34 The red vented Bulbul* Pycnonotuscafer

35 The red whiskered Bulbul P. jocosus

36 King crow Dicrurusadsimilis




37 Common House Mynah* Acridotheristristis

38 The pied Munah Sturnuscontra

39 House sparrow * Passer domesticus

40 Indian Tree pie Dendrocitta vagabunda

41 Common Babbler* Turdoidescaudatus

42 The racket tailed Drongo* Dicrurusparadiseus

43 The Babbling Thrush CerateropusCamorus

44 The Jerdons Chloropsis Chloropsisjerdoni

45 The green Bulbul Chloropisaurifrons

46 The shama Copsychusmalabaricus

47 Indian urenwarbler Prinia subflava

48 The streaked fantail warbler Cisticola juncidis

49 The tailor bird Orthotomussutorius

50 The jungleMuniah Acredothersfuscus

51 The Hill Munah or the Grackle Graculareligiosa

52 The black headed oriole Oriolusxanthornus

53 Baya weaver Bird Ploceusphilippinus

54 The white Wagtail Motacilla alba

55 The yellow headed wagtail M citreola

56 The Gray wagtail M. capsica

57 Spotted Munia Lonchurapunctulata

58 The Red-Munia * Estrilda amandava

59 The white backec Munia Lonchura striata

60 The purple sunbird* Nectarinia asiatica

61 The purple rumped sunbird N. zeylonica

62 The Indian Yellow backed

sunbird

Aethopygasiparaja

63 The scarlet flower pecker Dicacum cruentatum

64 The scarlet Minivet Pericrocotusflammeus

Coraciiform

65 The golden backed wood

pecker*

Brachypternusbengalensis

66 The yellow wood pecker DendrocopasMahrathons

Ord. Caracil

67 The Indian Rollerorthe blue jay

*

Coraciasbenhalensis

68 The common bee eaters* Meropsorientalis

69 White breasted king fisher Halcyonsmyrnenssis

70 The common king fisher* Alcedoatthis

71 The black capped kingfisher Halcyonpileata

72 The Brown headed stork

billed kingfisher

Pelargopsiscapensis

73 The Indian Hoopoe Upupaepops

Cuculit

74 Indian cuckoo * Cuculusmicropterus




75 The pied crested cuckoo Clamator jacobinus

76 The Crow Pheasant Centropussinensis

77 The common Koel* Eudynamishonorata

Psittachi

78 Blossom-headed parakeet* Psittacula cyanocephala

79 Indian Red breasted Parakeet P. fasciatus

80 Large Burmese parakeet P. eupatria-indoburmamica

81 Eastern Rose ringed parakeet* P. Krameriborasalis

Striges

82 Brown owl Strixflammeus

83 The Brown fish owl Bubozeylonensis

84 The scopes owl Otusscops

85 The spotted owlet Athenebrama

Accipitren

86 White backed vulture or the

Bengal vulture

Gypsbengalensis

87 The common Indian kite* Milvusmigrans

Columbac

88 The Indian Spotted Dove* Spilopelia chinensis

89 The Red jungle fowl Gallusgallus

Grallae

90 Water cocks Gallicrex cinera

91 The saruzcram Grusantigone

92 The Bronze wingedjacana Meto-pidiusIndicus

93 The pheasant tailed jacana Hydropha sisnuychirugus

94 The stone curiew Burhinusoedicenemus

95 Red wattled lapping vanellusindicus

Herodious

96 The white necked stork Ciconia epsioopus

97 The cattle Egret* Bulbulcusibis

98 The paddy Bird orthe pond

Heron*

Ardeolagrayii

99 The Night Heron Nyclricoraxnucticorax

100 The Chestnut Bittorn Xobrychuscinnamomens

101 The little Green Bittern Butoxiessp.

102 Shorellers Anasclypeata

103 The common Teal A. creaca

104 The Cotton Teal Nettapuscoromandelianus

C Reptiles

105 Indian Python Python molurusmolurus

106 Cobra Naja naja

107 Rat snake* Ptyasmucosus

108 Common Krait Bungaruscoeruleus

109 Russell’sviper Viperarusselli

110 Garden lizard* Calotesversicolor




111 Indian Chameleon* Chameleonzegylanicus

D Amphibians

112 Cricket Frog* Fejervarya limnocharis

113 Indian Bull Frog Hoplobatrachustigerinus

Source: State forest department Jorhat, Assam;*Observed during survey

The area falling under the 10 km radial distance is surrounded by both aquatic and terrestrial

ecosystems. There is no eco-sensitive area or wild life sanctuary within 10 kilometers of the

project area in both Jorhat and Golaghat district. The execution of project does not involve

loss of any wildlife habitat hence the impact on flora & fauna is insignificant.

3.4.10 Socio-Economic Environment

The socio-economic profile of the study area is based on Census of India data (2011). The

study of socio-economic components of environment incorporates various features viz.,

demographic structure, availability of basic amenities such as housing, education, medical

facilities, drinking water facilities, post, telegraph and telephone facilities, communication

facilities, recreational, cultural facilities, approach to villages etc. The study of these

parameters helps in identifying, predicting and evaluating the likely impacts due to the

proposed project activity in that region.

The Nambar, Khoraghat, Khoraghat Extension and East Lakhibari ML area are located in

Golaghat district and Borholla ML area is located in the Jorhat District of Assam. The

administrative divisions of the district are given in Table 3.24 and villages found in the study

area are as shown in Figure 3.21.

Table 3.24: Administrative Divisions of the Districts

S. No. Division Golaghat District Jorhat District

1. Revenue Circle 6 6

2. Census towns 2 7

3. Statutory towns 5 4

4. Total Villages 1125 848

The Borholla ML area lies in Titabor Revenue circle. East Lakhibari ML area and Khoraghat

Extension (partly) lie in Golaghat Revenue circle Nambar, Khoraghat and Khoraghat

Extension (majorly) lie in Sarupathar Revenue circle.

It is envisaged that the proposed project will have certain positive impacts and insignificant

negative impact as activities will be temporary on the surrounding areas with reference to

socio-economic environment due to influx of population and strain on existing infrastructure

for a short period of time. The data on baseline status of the study and basic information about

the socio-economic profile has also been collected during the site visit and from secondary

sources. Baseline information was collected to define the socio-economic profile of the study

area.



Golaghat District

Jorhat District

Figure 3.21: Villages found within the Study Area



3.4.10.1 Demography

The Nambar, Khoraghat, Khoraghat Extension and East Lakhibari ML areas in Golaghat

district cover approximately 67 villages and the Borholla ML area in Jorhat district cover

around 20 villages as per Census 2011. The demographic profile of the study area is given in

Table 3.25 and Table 3.26.

Table 3.25: Demographic Details of the Jorhat Study Area

Sl.

No.

Name of

Villages

Total no. of

Households



Borholla ML Area

1. Rajabari Panjan 363 944 833 1777 636 447 1083

2. Gaharichowa 276 708 670 1378 520 421 941

3. Kaliapani T.E. 99 229 227 456 159 138 297

4. Cherelipather 344 802 774 1576 585 461 1046

5. Khemakachari 359 794 745 1539 690 623 1313

6. Borholla T.E. 821 1927 1811 3738 1098 764 1862

7. Garjan Gaon 327 803 785 1588 589 479 1068

8. Sildubi 328 800 802 1602 526 463 989

9. No.2 Kakadonga

Habi 448 1042 1016 2058 850 763 1613

10. Borholla Grant 280 689 637 1326 544 427 971

11. No.1 Kakadonga

Habi Gaon 325 797 801 1598 678 605 1283

12. Matikhula Gaon 143 359 337 696 291 243 534

13. Miri Gaon 351 846 813 1659 693 574 1267

14. No,1 Block 385 948 862 1810 755 581 1336

15. No.2 Block 278 669 643 1312 550 487 1037

16. No.3 Block 543 1338 1270 2608 1090 910 2000

17. Halfmile Bell 551 1435 1332 2767 1161 929 2090

18. No.4 Block 357 867 817 1684 721 573 1294

19. Nagabal Gaon 218 523 518 1041 392 332 724

20. Sukanjun 328 788 780 1568 668 617 1285


Table 3.26: Demographic Details of the Golaghat Study Area

Sl.


Total no. of

Households



Khoraghat & Nambar ML Area

1. Ajharguri No.2 51 137 117 254 83 60 143

2. Kathonipur 26 56 55 111 44 31 75

3. Madhupur No.1 58 186 151 337 134 95 229

4. Madhupur No.2 364 1066 1021 2087 408 333 741

5. Kamalpur 33 75 75 150 61 52 113

6. Ranipukhuri 98 263 209 472 127 69 196

7. Rajapukhuri 95 226 218 444 157 139 296

8. Chetonapur 77 185 188 373 102 82 184

9. Lakhinagar No.1 136 299 349 648 239 188 427



Sl.


Total no. of

Households



10. Lakhinagar No.2 79 163 189 352 133 108 241

11. Bidyapur 363 1145 1052 2197 650 484 1134

12. Janakpur 39 96 96 192 77 64 141

13 Hatidubi 176 439 434 873 257 222 479

14 Navajyoti Majgaon 75 185 168 353 144 120 264

15 Misamari 13 20 28 48 12 14 26

16 Bordondi No.1 28 71 58 129 53 36 89

17 Bordondi No.2 85 221 216 437 158 116 274

18 Goroibil 47 108 124 232 72 60 132

19 Dhonpur No.2 0 0 0 0 0 0 0

20 Tamulpur 37 92 100 192 75 70 145

21 Lotapur 43 106 97 203 70 51 121

22 Haldhibari 183 490 387 877 314 185 499

23 Jordolong No.1 41 97 105 202 69 56 125

24 Dimorujan 85 189 179 368 143 97 240

25 Jurpukhuri 33 74 89 163 54 48 102

26 Benganabari 51 138 126 264 92 69 161

27 Da-Kawalipathar

No.1 75 165 158 323 122 88 210

28 Da-Kawalipathar

No.2 30 63 53 116 43 29 72

29 Jordolong No.2 52 132 111 243 106 74 180

30 Jahajibosti 45 132 129 261 65 53 118

31 Gholapani 114 235 216 451 144 121 265

32 Lachit Gaon No.2 190 533 518 1051 380 301 681

33 Lachit Gaon No.1 80 220 194 414 162 104 266

34 Bilgaon 151 346 353 699 253 230 483

35 Santipur No.2 46 108 109 217 82 63 145

36 Majgaon 117 293 268 561 174 125 299

37 Chetiagaon No.1 205 667 492 1159 468 249 717

38 Chetiagaon No.2 98 250 220 470 153 92 245

39 Kempur 53 168 154 322 87 59 146

40 Krishnapur 265 804 773 1577 416 294 710

41 Chainpur 201 567 516 1083 312 202 514

42 Ratanpur 88 237 253 490 107 83 190

43 Jordolong No.1 62 138 149 287 111 92 203

44 Jordolong No.2 32 96 107 203 73 61 134

45 Santipur 106 286 275 561 174 129 303

46 Sonalinagar No.1 28 67 65 132 57 39 96

47 Sonalinagar No.2 174 417 409 826 313 245 558

48 Thaigirguri 74 168 167 335 119 104 223

49 Owabari 50 101 94 195 81 67 148

50 Ranipukhuri 135 317 294 611 232 195 427

51 Milonpur 26 60 53 113 41 32 73

52 Chaluk Pathar No.1 212 592 565 1157 419 331 750

53 Chaluk Pathar No.2 99 240 244 484 159 113 272

54 Chaluk Pathar No.3 214 642 613 1255 340 276 616

55 Rangmaipur 61 126 122 248 98 69 167



Sl.


Total no. of

Households



56 Rajapukhuri No.2 56 159 159 318 119 83 202

57 Rajapukhuri No.3 176 535 551 1086 276 222 498

58 Rajapukhuri No.1 60 175 162 337 106 62 168

59 Gouri Pathar 26 64 49 113 54 41 95

60 Kuki Bosti 94 246 253 499 190 183 373

61 Aao Bosti 55 127 140 267 86 87 173

62 Tengatol Bosti 28 84 84 168 63 36 99

63 Nepali Bosti 53 140 124 264 104 66 170

64 Pukhuri Para 119 317 309 626 241 220 461

65 Tokse Naga Bosti 0 0 0 0 0 0 0


66 Ghiladhari 981 2337 2324 4661 2457 1411 1046

67 Merapani 717 1914 1604 3518 1546 1200 2746


3.4.10.2 Occupation

All the villages have agriculture as their prime source of income. Apart from agriculture,

villagers are also engaged in poultry, fishing and labour work.

3.4.10.3 Medical Facilities

There are 23 Private hospitals, 14 Community Health Centre’s, 78 Primary Health Centre’s,

290 Health Sub-Centre’s and 1Civil hospital in the Jorhat and Golagaht districts. The medical

facilities available in respective districts are given in Table 3.27.

Table 3.27: Available Medical Facilities in and around Study Area

S. No. Medical Facilities Golaghat District Jorhat District Total

1 Private Hospitals 6 17 23

2 Community Health Centre’s 6 8 14

3 Primary Health Centre’s 40 38 78

4 Sub- Centre's 146 144 290

5 Civil Hospital 1 0 1

Total 199 207 406

3.4.10.4 Fire Services

The nearest fire station for ML areas in Golaghat is in Sarupathar Revenue circle in Saru

Sewaguri village, Tengahulla GP. The nearest fire station for Borholla ML area is in Ward 08,

Titabor town.

3.4.10.5 Connectivity

Nearest State Highway to East Lakhibari ML area are SH 34 and Borholla ML area is SH 32

and SH 33. The nearest National Highway to Nambar, Khoraghat and Khoraghat Ext. ML

area is NH 39. This is also the Asian Highway 1.

Jamuguri railway station is nearest to East Lakhibari ML area. Sarupathar, Naojan and

Chungajan railway stations are nearest to Nambar, Khoraghat and Khoraghat Ext. ML area.



The nearest Bus Station is in Merapani Forest Block, Merapani GP and in Ward 02,

Sarupathar Town for ML areas in Golaghat district and Borholla TE, Titabor for Broholla ML

area.

3.4.10.6 Environmental Concern

Public Consultations were carried out by ACE team during the study period in Golaghat and

Jorhat Districts. During consultation, it was observed that people had concerns with respect to

their existing socio-economic conditions like poor connectivity, bad condition of the village

roads, and water scarcity in summer etc. With respect to the proposed project, the public had

positive perception like better job opportunities as well as infrastructural facilities and had

welcomed the project. Photo Plate 3.8 shows the stakeholder consultations at different

locations in the study area.

Photo Plate 3.8: Public consultations conducted at different locations in Study Area

3.4.10.7 Corporate Social Responsibility

ONGC is actively engaged in CSR Activities in the surrounding area of the existing

activities/installations. The same will be continued for the proposed project also.

CSR programme objectives are to proactively manage community expectations and support

the district administration for the development of the project area of Golaghat and Jorhat

District. CSR projects are focused on improving social capital through our health, education,

entrepreneurship, women empowerment and infrastructure support initiatives. These Projects

are designed and implemented through and in consultation with local authorities. The details

on CSR’s expenditure for the year of 2013-14 and 2014-15 are given in Annexure - V.

44

AANNTTIICCIIPPAATTEEDD

EENNVVIIRROONNMMEENNTTAALL

IIMMPPAACCTTSS AANNDD

MMIITTIIGGAATTIIOONN

MMEEAASSUURREESS



ANTICIPATED ENVIRONMENTAL

IMPACTS AND MITIGATION

MEASURES

4.1 ASSESSMENT OF IMPACTS ON THE ENVIRONMENT

The potential impacts anticipated during the Development Drilling operations are identified

and presented in this Chapter. The impacts on air, noise & vibration, water, soil, biological

and socio-economic environment are identified.

The mitigation measures, which are required to negate the adverse impacts, are also discussed

in this chapter. After discussing the adverse impacts and its mitigation measures, the positive

impacts due to this proposed project are also given at the end. The general Methodology used

for Environmental Impact Assessment is presented in Figure 4.1 with consultations

incorporated into every phase:

Environmental

Description

Drilling Programme

Design

Hazard

Identification

Hazard

Characterisation

Environmental

Sensitivities

Environment

Interactions

Environmental

Impact

Assessment

Mitigation

Measures

Figure 4.1: Methodology for Environmental Impact Assessment

The Drilling Programme details are described under Chapter 2- Project Description and the

Environmental description is depicted in Chapter 3- Environmental Baseline. These two

chapters allow identification of hazards and their characterization as well as aid in detection

of environmental sensitivities. The following chapter will describe the Environmental

interactions, the impacts and their mitigation measures based on the scenario derived from

Chapter 2 and Chapter 3.

4.2 IDENTIFICATION OF INTERACTIONS

A matrix has been developed for the activities to be carried out for development drilling of 12

wells in Jorhat and Golaghat district against the identified environmental sensitive parameters.

This matrix is called as ‘Interaction Matrix’.

The activities carried out during the Drilling Operations are:

Site preparation and installation of facilities.

Road construction.

4



Drilling operation.

Operation of heavy machineries and DG sets.

The Interaction Matrix is presented in Table 4.1. The Interaction between the Project

Activities and the various Environmental Components is shown in this table. At this stage the

interactions are not quantified, but only identified for further assessment. The potential

adverse impacts are represented by ‘X’ mark in the table and the beneficial impacts are

represented by ‘+’ mark.

Table 4.1: Interactions between Project Activities and Environmental Parameters

Environmental

Parameters

Project Activities

Sit

e

Pre

para

tio

n

an

d

inst

all

ati

on

of

faci

liti

es

Roa

d

con

stru

ctio

n

Dri

llin

g

op

erati

on

Op

erati

on

of

hea

vy

mach

iner

ies

an

d D

G s

ets

Physical Parameter

Topography X X X X

Air X X X X

Noise and Vibration X X X X

Surface Water X X

Ground Water X

Soil X X X X

Biological Parameter

Flora X X X X

Fauna X X X X

Socio-Economic Parameter

Land Use X X X X

Tourism

Employment + + + +

Economy + +

Infrastructure +

Community Health and Safety X X X X

Occupational Health and Safety X X X X

4.3 POTENTIAL IMPACTS AND MITIGATION MEASURES

The Drilling Sites will be located on a plain area. Site-Preparation and Road-Construction

activities will be undertaken simultaneously. Pits with Impervious Lining will be constructed

for containment of effluent, drill cuttings and drilling mud. After the site preparation,

installation of drilling equipments and construction of pits, the Drilling Operation will

commence.

Drilling will be confined to a relatively small area and staff movement will be restricted to the

fenced premises (Drill Site and Drill Site Accommodation). The potential impacts have been

identified for the construction and operations phase. These impacts can be

reduced/controlled/prevented by proposed mitigation measures and Good Management

Practices (Safety Management, Environment Management and HSE Management).



4.3.1 Air Environment

The drilling and other operations during development drilling may generate emissions

impacting the air environment. Main emission sources include:

Site clearance and transportation

Emissions from DG sets and use of pumps

Flaring and venting of hydrocarbons

Fugitive emissions

4.3.1.1 Impacts

Temporary and marginal impact to air quality may occur during the construction activities

such as clearing of land, road construction and installation of drilling equipments. However,

these shall be limited to the site and its immediate environ due to dilution of finer particles

and settlement of large particulate matter.

Air quality may also be affected during transportation of materials and other resources during

construction and operational phase. However, adoption of suitable measures, good roads and

routine maintenance of the vehicles shall minimize the impact of transportation.

Exhaust emissions from operation of construction machinery is likely to contribute to air

pollutant load (primarily PM, NOX, SO2 etc.) in the ambient air near well site facilities.

However the impact will be of low significance due to localized nature as well as considering

the temporary duration of construction and drilling activities and the necessary mitigation

measures that will be adopted by the proponent.

Other, major source of emission may be attributed to the DG Sets used during drilling phase,

which is minimal but essential for any well development facility to operate in a safe and

reliable manner. However, DG sets will be installed with adequate stack height to ensure

wider dispersion and adoption of appropriate fuel such as low sulfur diesel oil for effective

combustion. Also, adoption of good engineering and maintenance practice shall minimize the

impacts of emission.

Fugitive emissions (mainly consisting of methane and VOC) may also result due to leaks in

tubing, valves, connections, flanges, packing’s, pump and compressor seals, gas, conveyance

systems, pressure relief valves, tanks or open pits/containments, and loading and unloading

operations of hydrocarbons. The drilling operation may leak minimal amounts of gas into the

atmosphere, which may affect the air quality. Adoption of good maintenance practices shall

minimize the risk of these emissions.

Detailed air quality modeling has been carried out for predicting the concentration of different

pollutants contributed during the proposed drilling operation.

4.3.1.2 The Model

Air dispersion modeling for prediction of maximum increment in Ground Level

Concentration (GLC) of different air pollutants in the surrounding area due to the emission

from DG sets present in proposed drilling during operation stage has been carried out by using

the AERMOD View model developed by the US EPA. This model is used extensively to

assess pollution concentration and deposition from a wide variety of sources and is also

recommended by CPCB. The model is based on Gaussian Plume Air Dispersion. It is a steady



state plume model in stable boundary layer and the concentration distribution is assumed to

be Gaussian in vertical and horizontal direction. Given source characteristics, emissions,

meteorology and averaging time, the model predicts GLCs of various pollutants.

4.3.1.3 Model Input

Stack and Emission Characteristics:

The major source of emission during developmental drilling is from the DG sets (1430 KVA).

The stack emissions from the proposed drilling wells would be constituted of mainly

particulate matters (PM10), sulphur dioxide (SO2), oxides of nitrogen (NOx) and Hydrocarbons

(HC). The stack and emission characteristics pertaining to the DG sets present in the proposed

drilling wells are reported in Table 4.2. The modeling has been carried out as per the

guidelines of the CPCB. The 24-hourly maximum GLCs have been computed for comparison

with the standards.

Table 4.2: Stack & Emission Characteristics

S.

No. Stack Details

Release

Height

(m)

Emission Rate

(g/s)

Gas

Exit

Temp

(K)

Stack

Dia.

(m)

Gas Exit

Velocity

(m/s) PM10 SO2 NOx HC

1.

DG Sets

(4 x 1430

kVA)

7.7 0.008 0.0025 0.001 0.036 973 0.1 20

Meteorological Parameters:

On-site hourly meteorological data monitored during October to December 2015 and gathered

from secondary sources in respect of temperature, wind speed, wind direction, humidity and

cloud cover has been used as input for air dispersion modeling. Hourly mixing heights used

for modeling have been calculated and taken from the AERMOD View model itself.

4.3.1.4 Modeling Procedure

The modeling has been carried out as per the guidelines of the CPCB. Particulate Matter

(PM10), sulphur dioxide (SO2), oxides of nitrogen (NOx) and Hydrocarbon (HC) have been

considered for modeling. Modeling has been conducted for one season. Square pattern of

receptor locations have been considered. The modeling area considered includes the ML area

plus one km buffer to the ML area. Khoraghat, Khoraghat extension and Nambar share

boundaries and hence have been modeled together. East Lakhibari and Borholla ML areas

have been modeled separately. The 24-hourly maximum GLCs have been computed for

comparison with the standards.

4.3.1.5 Modeling Results

The predicted 24-hourly maximum incremental GLCs along with isopleths plot of

concentration for PM10, SO2, NOx and HC in the study area are reported below in Table 4.3

and Figure 4.2 – 4.5.



Table 4.3: Predicted 24-hourly Maximum GLCs for air pollutants

ML area Pollutant

Maximum

Concentration

Recorded

During the Study

(µg/m3)

Incremental

Concentration

due to

Drilling

(µg/m3)

Resultant

Concentration

(µg/m3)

NAAQS

standards

(µg/m3)

Nambar and

Khoraghat

PM10 64.4 2.397 66.797 100

SO2 6.78 0.749 7.529 80

NOX 16.53 0.30 16.83 80

HC 2.17 4.072 6.242 -

East Lakhibari

PM10 62.2 16.286 78.486 100

SO2 5.95 5.089 11.039 80

NOX 13.81 2.036 15.846 80

HC 2.67 1.902 4.572 -

Borholla

PM10 43.5 7.421 50.921 100

SO2 4.34 2.319 6.659 80

NOX 11.46 0.928 12.388 80

HC 1.41 3.909 5.319 -



1) PM10 Isopleths for East Lakhibari ML Area



2) Maximum PM10 Concentration Isopleth for East Lakhibari



3) PM10 Isopleths for Nambar, Khoraghat and Khoraghat Extension ML Area



4) Maximum PM10 Concentration Isopleth for Nambar, Khoraghat and Khoraghat Extension ML Area



5) PM10 Isopleths for Borholla ML Area



6) Maximum PM10 Concentration Isopleth for Borholla ML Area

Figure 4.2: Isopleths Plot of Concentration for PM10 (µg/m3) at Different ML Blocks Location



1) SO2 Isopleths for East Lakhibari ML Area



2) Maximum SO2 Concentration Isopleth for East Lakhibari



3) SO2 Isopleths for Nambar, Khoraghat and Khoraghat Extension ML Area



4) Maximum SO2 Concentration Isopleth for Nambar, Khoraghat and Khoraghat Extension ML Area



5) SO2 Isopleths for Borholla ML Area



6) Maximum SO2 Concentration Isopleth for Borholla ML Area

Figure 4.3: Isopleths Plot of Concentration for SO2 (µg/m3) at Different ML Blocks Location



1) NOX Isopleths for East Lakhibari ML Area



2) Maximum NOX Concentration Isopleth for East Lakhibari



3) NOX Isopleths for Nambar, Khoraghat and Khoraghat Extension ML Area



4) Maximum NOX Concentration Isopleth for Nambar, Khoraghat and Khoraghat Extension ML Area



5) NOX Isopleths for Borholla ML Area



6) Maximum NOX Concentration Isopleth for Borholla ML Area

Figure 4.4: Isopleths Plot of Concentration for NOX (µg/m3) at Different ML Blocks Location



1) HC Isopleths for East Lakhibari ML Area



2) Maximum HC Concentration Isopleth for East Lakhibari



3) HC Isopleths for Nambar, Khoraghat and Khoraghat Extension ML Area



4) Maximum HC Concentration Isopleth for Nambar, Khoraghat and Khoraghat Extension ML Area



5) HC Isopleths for Borholla ML Area



6) Maximum HC Concentration Isopleth for Borholla ML Area

Figure 4.5: Isopleths Plot of Concentration for HC (µg/m3) at Different ML Blocks Location



4.3.1.6 Discussion on Modeling Results

The predicted 24-hourly maximum incremental GLC for PM10 is found to be highest (about

78.486 g/m3) in East Lakhibari ML area. The GLC for SO2 is also found to be highest in this

area (about 11.039 g/m3). This may be due to the difference in elevation in the surrounding

areas, not allowing the pollutants to disperse spatially.

The GLC for NOx and HC are higher in the Nambar, Khoraghat and Khoraghat Extension ML

area. This may be due to concentration of the pollutants at the base of the sudden elevated

area, where the maximum concentrations are found. The elevations may restrict the flow of

pollutants further. Also the maximum concentrations are found in area with no settlements.

Referring to the background (monitored) ambient air quality, the mean baseline level when

added to the corresponding maximum predicted incremental GLC, the resultant levels of

PM10, SO2, NOx and HC at different receptor locations are found to be well within their

permissible standard limits pertaining to industrial, residential and rural areas.

4.3.1.7 Mitigation measures

The mitigation measures to control the impacts of air pollution are given below:

Water spraying will be done on the access roads to control re-entrained dust during dry

season.

Regular maintenance and servicing of heavy machineries and DG sets to avoid generation

of air pollutants due to un-optimal working condition of the machineries and DG sets will

be carried out. The stack height of the DG will be maintained as per the CPCB standards.

Mandate only PUC certified vehicles. Ensure vehicles used for transportation of loose

construction materials are covered and not overloaded over the free board limit

Plan in advance to ensure efficient operations.

Conduct regular monitoring of fuel consumption.

Use diesel with low Sulphur content.

Mandate wearing of dust masks for all workers working in and around dust generating

area

Only minimum volume of hydrocarbons required for the test should be flowed and well

test durations should be reduced to the extent practical. An efficient test flare burner head

equipped with an appropriate combustion enhancement system should be selected to

minimize incomplete combustion, black smoke, and hydrocarbon fallout. Volumes of

hydrocarbons flared should be recorded.

4.3.2 Noise and Vibrations

Noise will be generated during the construction and operational phase due to drilling, rotating

equipments, pumping, diesel generator sets, flaring, transportation etc.



4.3.2.1 Impacts

The noise related disturbance is likely to be experienced by communities residing in

proximity of the construction site and along material transportation routes. Noise impacts are

estimated by use of baseline noise assessments for developments close to local human

populations. For hemispherical sound wave propagation through homogeneous loss free

medium, the noise levels at various locations from different sources can be estimated by using

the relation:

Lp2 = Lp1 20 log (r2/rl) – Ae1,2

Where Lp1 and Lp2 are sound levels at two points located at distances r1 and r2 from the

source. Ae1, 2 is the excess attenuation due to environmental conditions. Combined effect of

all the sources then can be determined at various locations by using the principle of

logarithmic addition:

Lptotal = 10 log (10(Lp1/10) + 10(Lp2/10) + 10(Lp3/10) + ………)

The noise generated due to the diesel engines operating the rig along draw works on rig floor

is considered to be the most significant of the noise generating sources in the drilling

operation. Generally, the noise sources in a drilling well are scattered within an area of about

140 m x 140 m. Thus the noise pollution can be considered as negligible for the nearest

human habitation. The existing forests patches are already degraded and influenced by the

present operational activities in the existing production field. Hence, the wild fauna present in

the surrounding forest patches accustomed to avoid the activity area. Moreover, these forest

patches are not the part of any wild life sanctuary/ national park, so it is envisaged no

significant wild life habitation is existing nearby. Therefore, no major impact due to the noise

generation from the proposed drilling activities is envisaged on the project area.

The noise propagation modeling performed for noise generation due to operation of the diesel

engines shows the following exposure levels (Table 4.4) in terms of the occupational and

human settlement exposure levels.

Table 0.4: Occupational and Human Exposure Levels

Type of exposure Predicted exposure level dB( A)

Occupational exposure

Leq (8 h) at drilling platform (draw works) 104 (at source level)

Leq (8 h) at the site boundary (about 40 m

from drilling platform) 64

Human settlement exposure

Leq (24 h) at villages 0.5 km or more away 54 (day)

47 (night)

The background noise level in the rural/ residential areas has been observed in the range of

41.5 - 67.8 dB (A) during daytime and 30.0 – 59.8 dB (A) during nighttime.

The damage risk criteria for hearing, as enforced by OHSA, USA, stipulate that noise levels

up to 90 dB (A) are acceptable for 8-hour exposure per day.




The mitigation measures for the aforementioned potential impacts are listed below:

The DG sets should be kept in acoustic enclosures.

The machineries and DG sets have to be serviced and maintained regularly to avoid

generation of unwanted noise and vibration.

The workers working in noisy environment will compulsorily wear ear muffs to protect

themselves from the impacts of high noise level.

The workers handling vibrating equipments will compulsorily wear viscoelastic anti-

vibration gloves.

Field-related vehicle traffic should be reduced as far as possible and access through local

communities should be avoided when not necessary.

4.3.3 Water Environment

Water is required for the construction, operation and maintenance of the development well.

All these activities generate wastewater including drilling waste water, gray and black water

from showers, toilets and kitchen facilities etc.

4.3.3.1 Impacts

About 25 kLD of water will be consumed during the drilling period per well. Wastewater

generate from the drilling activity is about 15-17 m3/day per well.

Around 3.4 kLD (80% of domestic water requirement, i.e. 04 kLD) is anticipated quantity of

sewage generation from each well. Runoff water from the drilling area might consist of

dissolved inorganic or organic compounds. Approximately 0.22 m3 per person/day and 0.11

m3 per person/day of grey water and black water respectively will be generated during the

project activity. Hazardous waste such as waste lube/system oil approximately 0.15 kL/well

from machinery, used oil from generator sets are likely to be generated. Approximately 225

m3 Drill Cuttings will be generated during drilling phase of wells.

An environment-friendly Water-Based Mud (WBM) system will be used for drilling of the

proposed wells. It may be noted that a typical WBM may contain nearly 80% water and 20%

Clay as well as Chemicals by weight. Thus this will have minimum impact on the water

environment.

The casing used in the development drilling prevents natural gas, oil, associated water from

leaking out into the surrounding freshwater aquifer. Thus a properly designed casing will

prevent impact on the surrounding water bodies.

Discharge of untreated sewage or effluent from drilling operation or run off, onto the land or

surface water body might contaminate the ground and surface water. This can in turn have

secondary impact on the flora, fauna and biodiversity of that area.

Surface runoff over drilling waste, chemical and fuel storage areas during rainfall may get

contaminated and impact the water quality.




Suitable and viable mitigation measures for the anticipated potential impacts on water

environment are presented below:

Install cuttings and fluid cleaning/treatment equipment to ensure optimal cleaning of

cuttings in order to reduce the amount of fluid that will be discharged with the cuttings.

Oily sludge will be collected and disposed by bio-remediation.

Hazardous wastes such as waste lube/system oil will be collected and sold to authorized

recycler.

Put in place management procedures to ensure optimal performance of the cuttings

cleaning equipment and proper housekeeping of shale shaker screen.

Well Casing will be done to protect ground water and shallow aquifers from

contamination.

Maintain a continuous drill fluid mass balance throughout the drilling program.

Optimize drilling well size to minimize the amount of rock to be drilled.

Drilling site constructed with garland system with Oil & Gas separator pit at one corner of

the site (having location above high flood level).

Proper treatment of the all wastewater produced will be carried out through Mobile

Effluent Treatment Plant to ensure compliance with criteria set by regulatory bodies.

4.3.4 Land Environment

Land is required for drilling pads, temporary storage facilities, drilling site accommodation,

construction of waste pits, access roads, equipment staging area, storage of construction

materials, transmission facilities etc. During all these construction and operation phases land

environment gets continuously impacted. Nearly 140x140 m of land will be required for each

drilling location.

4.3.4.1 Impacts

The following impacts are anticipated on the land environment due to the proposed drilling

operation:

Site clearance/preparation will result in removal/change of top soil.

Change in Land Use pattern will occur due to the construction activities.

Indiscriminate discharge of sewage/solid waste from the drilling activity will contaminate

the land

Accidental spillage from Storage of chemicals and fuels on unlined areas/unprotected

areas can cause land contamination.

Usage of heavy machineries and construction activities will lead to soil compaction



Improper decommissioning/ abandonment will lead to loss of aesthetics, deterioration in

soil quality and accidental hazards.


The following mitigation measures will aid in reduction of impacts on land:

The top soil removed during site clearance will be stored and preserved in a manner to

maintain its fertility and later used for restoration purpose.

Proper sanitation facilities and bins will be provided at the drilling location for collection

of sewage/solid waste.

The Sewage/Solid Wastes will be treated and disposed or sold to Authorized Recyclers as

per the Notification of MoEF (G.S.R.546 (E) dated 30th August 2005).

Ensuring proper storage of drill cutting and chemicals to prevent any potential

contamination from spillage.

Ensure well-designed storage facility with regular inventory checking for fuels, lubricants

and chemicals to prevent any potential contamination from spillage.

Restrict the Movement of Vehicles and Heavy Machinery to the paved area only.

Efforts to restore the drilling area back to its original condition should be made to the

extent possible during the decommissioning period.

4.3.5 Biological Environment

The three landuse maps conclude that majority of the area in the blocks of Nambar,

Khoraghat, Khoraghat Extension, and East Lakhibari includes open land and vegetation

cover. There is no open land in Borholla district and vegetation cover is high in this area.

Agriculture is also practiced in these areas, especially in Borholla and East Lakhibari ML

areas. No eco-sensitive or wild life sanctuary within the blocks area. No endangered species

were found within the study area. Common flora and wild fauna were observed in the study

area.

Impact on local flora and fauna may occur due to changes in habitat or habitat destruction due

to land clearance and preparation activities for proposed drilling site. However, this activity

shall be restricted to the limited land area and therefore the impact shall be local and minimal.

Emission of particulate matter during drilling activities is also likely to have impact on flora

and fauna. However, these impacts have been envisaged to be low as the drilling phase is a

temporary phase. To further reduce the impact of suspended particulate matter, the land shall

be sprayed with water during drilling activities. Impact on biological environment due to

emissions from movement of vehicles (transportation of construction materials), operation of

generators and other process have been envisaged to be negligible as suitable mitigation

measures (such as routine maintenance etc) shall be adopted to minimize the impacts from

these sources.

Noise generated from operation of equipments, machinery, generators and vehicles during

drilling have been envisaged to be negligible as the activity is for short duration of time and

suitable measures shall be adopted (such as use of noise attenuation devices) during drilling

and operation phase. Significant impacts on flora and fauna may occur due to dumping of



solid waste and wastewater discharges from drilling activities. However, these impacts shall

be minimized by adoption of waste management plan, wherein solid waste and wastewater

generated shall be subjected to appropriate treatment prior to their final disposal (such as

mobile effluent treatment plant).

4.3.6 Socio-Economic Environment

4.3.6.1 Impacts

The drilling activities are likely to have many beneficial outcomes and few impacts on the

existing socio-economic profile of the area:

The proposed activities will generate temporary employment opportunities to the local

people for road construction, site preparation, supply and transport of raw materials and

equipment, auxiliary and ancillary works, etc.

Construction of new roads and upgradation of existing roads to facilitate the movement of

the heavy equipments and vehicles would lead to improvement in transport facilities in

the area.

There will not be major influx of people, as only 25 – 30 people will be employed per

well per shift with two shifts in a day. Hence, the impact due to influx of people will be

insignificant.

The activities would also result in enhancement of local skill levels through exposure to

drilling activities and technology and will help in capacity building for future

employment opportunities.

There can be occupational hazards such as personal injuries, accidents during installation

and operation of drilling rigs. However, block operator will follow stringent health, safety

and environment practices as per Mines Act, 1952 and OISD guideline for all its

operations, which are to be followed by all employees, consultants and contractors

working for this development project.

Community health and safety may get impacted due to various pollution generating

activities of the proposed project. However, the proponent will ensure compliance to all

the applicable laws, rules, regulations, acts and standards to have minimum pollution

footprint. Also, development drilling being a temporary activity, this impact will be of

temporary nature and of low significance.


The following mitigation measures are proposed for augmenting the socio-economic benefits:

ONGC will implement Waste Management Plan and undertake water quality monitoring

before, during and after the operations.

ONGC is already undertaking Corporate Social Responsibility (CSR) activities in the

form of monetary help for education, infrastructural development, sports, culture and

orphanages, preferably to girl children, destitute women and senior citizens in the vicinity

of operational area. The same will be followed for the proposed project as well.

55


MMOONNIITTOORRIINNGG

PPRROOGGRRAAMM



ENVIRONMENTAL

MONITORING PROGRAM

5.1 INTRODUCTION

An environmental monitoring plan provides a delivery mechanism to address the adverse

environmental impacts of a project during its execution, to enhance project benefits, and to

introduce standards of good practice to be adopted for all project works. An environmental

monitoring program is important as it provides useful information and helps to:

Assist in detecting the development of any unwanted environmental situation, and thus,

provides opportunities for adopting appropriate control measures;

Define the responsibilities of the project proponents, contractors and environmental

monitors and provides means of effectively communicating environmental issues among

them;

Define monitoring mechanism and identify monitoring parameters;

Evaluate the performance and effectiveness of mitigation measures proposed in the

Environment Management Plan (EMP) and suggest improvements in management plan, if

required;

Identify training requirement at various levels.

An environmental monitoring program is suggested to monitor environmental parameters

during survey, drilling and Post Drilling Phase of the project. The monitoring plan is given in

Table 5.1, Table 5.2 and Table 5.3 below. This environment monitoring plan is designed for

ten years.

5



Table 5.1: Recommended Environmental Monitoring Protocol – Pre Drilling Phase

Receptor Location Monitoring Mechanism Monitoring and Reporting

Frequency

Ambient Air Quality At Drilling Site Monitoring NOX, SO2, PM10 VOCs and HC Once prior to drilling

Surface water Quality

(if available)

Water bodies within the

radius of 1 km from the

Drilling Site

pH, Total Suspended Solids, Total Dissolved Solids, BOD, COD,

O&G, heavy metals (Zinc, lead, iron, nickel, cadmium and

chromium)

Once prior to drilling

Noise Levels At Drilling Site For Background Noise Levels (using Noise meters) Once prior to drilling

Physical Infrastructure

At Drilling Site 1. Lining of effluent pits with 300 GSM HDPE sheets.

2. Oil & Grease traps on outlets; storm water runoff points.

3. Separate run off routes for non-contaminated and contaminated

run off. Treatment facilities for the contaminated run off.

4. Septic tank & soak pits of adequate size and presence of bunds

around the pit.

5. Chemical storage should be covered.

During site preparation.

Clearance of Trees (if

existing)

At Drilling Site and

supporting infrastructure

locations

Inventory of trees likely to be cut and number of trees to be planted

as part of Compensatory Tree Plantation Program.

During site preparation.

Table 5.2: Recommended Environmental Monitoring Protocol – During Drilling Phase


Frequency

Natural Resource At Drilling Site 1. Quantity of each type of material used including

water consumption

2. Quantity of fuel used for power

Daily during drilling phase

Ambient Air Quality At Drilling Site Monitoring NOX, SO2, PM10 VOCs and HC Once in a six month

Surface Water Quality

(if available)

Water bodies within the

radius of 1 km of

pH, TSS, TDS, BOD, COD, O&G, heavy metals

(Zinc, lead, iron, nickel, cadmium and chromium)

Once in a season




Frequency

Drilling Site that will be

utilized for consumption

and disposal.

Noise & Vibration

At Drilling Site, near DG

sets and drilling pumps.

1. Noise level monitoring

2. Maintenance of machineries

3. No unnecessary operation of machinery when not

required

4. Use of ear plug by workforce

5. Presence of sound barriers or acoustic enclosure

around DG sets.

Once in a month

Drilling wastes At Drilling Site 1. Drill cuttings wash water: its quantification,

characteristics (TSS, TDS, organic compounds,

heavy metals, oil & grease), its treatment and safe

disposal.

2. Spent drilling fluid: its treatment and reuse.

3. Maintenance of effluent pits, drill cutting storage

pit and waste mud pit.

Quantity of wastes to be

recorded on daily basis.

Characterization of the waste to

be done every month.

Wastewater

Generation

At Drilling Site Waste water generation rate. Quantity to be recorded every

day.

Oil wastes At Drilling Site Spent oil from engines.

A logbook should be maintained

daily during drilling phase. If no

spent oil is produced, the same

should be noted in the logbook.

Oil Spills At Drilling Site Facilities oil spill contingency plan should be in

place.

During drilling phase



Table 5.3: Recommended Environmental Monitoring Protocol – Post Drilling


Frequency

Drilling waste At Drilling Site Quantification of drill cuttings and safe disposal as per norms. At the end of the drilling

operation.

Land At Drilling Site Restoration and rehabilitation through:

1. Well head should be removed and well mouth to be capped if

HC is not discovered commercially.

2. Removal of all wastes such as used chemical bags, cotton,

jute, rags, papers etc. as per restoration policy in case no

commercial discovery.

3. Treatment and disposal of waste products, solids and liquid

in accordance with regulatory requirements

4. Removal of fencing & gates.

5. Backfilling and closing of all on site disposal pits as per legal

requirements.

At the end of the drilling

operation.

Surface Water

Quality (if available)

At Drilling Site

within radius of

1 km.

pH, Total Suspended Solids, Total Dissolved Solids, BOD,

COD, O&G, heavy metals (Zinc, lead, iron, nickel, cadmium

and chromium)

At the same location where pre

and during drilling phase

monitoring was done. Once after

the closing of drilled well.

Compensatory tree

plantation (If tree

cutting is involved

during drilling phase)

Tree plantation

locations

Survival rate of tree saplings. Once in a year for three years.

The post operational monitoring programme will be carried out under the supervision of ONGC.

66

AADDDDIITTIIOONNAALL

SSTTUUDDIIEESS



6 ADDITIONAL STUDIES

6.1 INTRODUCTION

As discussed in earlier chapters, ONGC proposes to conduct Development Drilling in

Nambar, Khoraghat, Khoraghat Extension and East Lakhibari ML areas in Golaghat district

and Borholla ML area in Jorhat district of Assam State. This chapter elucidates the Risk

Assessment (RA), Disaster Management Plan (DMP) and Emergency Response Plan (ERP)

for the proposed development wells.

6.2 RISK ASSESSMENT

„Risk Assessment (RA)‟ also known as „Hazard Analysis‟ and „Vulnerability Assessment‟ is

a procedure for identifying hazards and determining their possible effects on a community

and environment. Risk or hazard by itself is not an event - it is the potential for an event.

Drilling rig floor is the centre stage of all the drilling operations and it is most susceptible to

accidents. Safety precaution with utmost care is required to be taken during drilling as per the

prevailing regulations and practices so that accidents can be avoided. Due to advancement in

technology, number of equipments has been developed over a period to cater the need of

smooth operation on a rig floor. Various standards are required to be referred to cover the

variety of equipments used for safe operation in drilling and it is desirable to use a properly

prepared manual for occupational safety while working or drilling over a rig. It may,

however, be noted that well testing and production testing of hydrocarbons also require proper

analysis of hazards involved in production testing operations and preparation of an

appropriate Emergency Control Plan.

Hydrocarbon Operations are generally hazardous in nature by virtue of intrinsic chemical

properties of hydrocarbons or their temperature or pressure of operation or a combination of

them. Fire, Explosion, Hazardous Release or a combination of these are the hazard associated

with Hydrocarbon Operations.

Risk Screening

Some of the hazards associated with the drilling are:

Fires and Explosions:

o Non-Process Hydrocarbon Leak (Diesel, Fuel, Oil etc.);

o Non-Process Fire;

o Control system failure including electrical failure in control room.

Impact and Collisions:

o Accidental Falling of Object from Crown Block.

Loss of Station Keeping / Loss of Stability:

o Structural Failure;

o Equipment Failure.

6



External Hazards:

o Failure due to Earthquake, Extreme Weather, Strong Winds, Floods and Sabotage etc.

The primary emphasis in Safety Engineering is to reduce Risk to Human Life and

Environment. Some of the more important methods used to achieve this are:

Risk Analysis: Provides a relative measure of the likelihood and severity of various

possible hazardous events by critically examining the proposed drilling and associated

activities.

Work Safety Analysis: The technique discerns whether the project site and operating

procedures in practice have any inherent infirmities.

Safety Audit: Takes a careful look at operating conditions, work practices and work

environments to detect unsafe conditions

Together, these three broad tools attempt to minimize the chances of accidents occurring. Yet,

there always exists, no matter how remote, that Small Probability of a Major Accident

occurring. If the accident involves hydrocarbon in sufficient large quantities, the

consequences may be serious to the project, to surrounding area and the population therein.

These have resulted in the development of more comprehensive, systematic and sophisticated

methods of Safety Engineering such as Identification and Analysis of Hazards and Risk

Assessment to improve upon the Integrity, Reliability and Safety of Hydrocarbon Operations.

6.2.1 Methodology

The RA studies are based on Quantitative Risk Assessment Analysis (QRA). QRA aims to

provide a systematic analysis of the major risks that may arise as a result of onshore drilling

activities. Normally a three „levels‟ risk assessment approach is adopted for the industrial

activities. The brief outline of the three tier approach is given below:

A) Level 1 – Risk Screening

This is Top-Down Review of Worst- Case Potential Hazards/Risks, aimed primarily at

identifying drilling sites or areas within Blocks, which pose the Highest Risk. Various

screening factors considered, include:

Inventory of Hazardous Materials;

Hazardous Material Properties;

Storage Conditions (e.g. Temperature and pressure);

Location Sensitivity (Distance to Residential Areas / Populace).

The Data/Information is obtained from Site. The results provide a relative indication of the

extent of hazards and Potential for Risk Exposure.

B) Level 2 – Major Risk Survey (Semi - Quantitative)

The survey approach combines the Site Inspection with established Risk Assessment

Techniques applied both Qualitative as well Quantitative Mode. The primary objective is to

identify and select Major Risks at a specific location in the drilling site considering possible

soft spots / weak links during construction/operation/maintenance. Aspects covered in the risk

usually include:



Process Hazards;

Process Safety Management Systems;

Fire Protection and Emergency Response Equipments and Programs;

Security Vulnerability;

Impact of Hazards Consequences (Equipment Damage, Business Interruption, Injury,

Fatalities);

Qualitative Risk Identification of Scenarios Involving Hazardous Materials.

Risk Reduction Measures

Selection of critical scenarios and their potential of damage provide means of prioritizing

mitigation measures and allocation of resources to the areas with Highest Risks.

C) Level 3 – Quantitative Risk Assessment (Deterministic)

This is the stage of assessment of risks, associated with all Credible Hazards (scenarios) with

potential to cause an undesirable outcome such as Human Injury, Fatality or Destruction of

Property. The four basic elements include:

Hazards Identification utilizing formal approach (Level 2, HAZOP etc.);

Frequency Analysis: Based on past Safety Data (incidents / accidents), identifying likely

pathway of failures and quantifying the toxic / inflammable material release;

Hazards Analysis to quantify the consequences of various hazards scenarios (Fire,

Explosion [due to release of NG], Toxic Vapour Release [due to release of H2S] etc.).

Establish minimum value for damage (e.g. IDLH, Over Pressure, Radiation Flux) to

assess the Impact on Environment.

Risk Quantification: Quantitative techniques are used considering effect / impact due to

weather data, population data, and frequency of occurrences and likelihood of Ignition /

Toxic release. Data are analyzed considering likely Damage (in terms of Injury / Fatality,

Property Damage) each scenario is likely to cause.

QRA provides a means to determine the relative significance of each undesired event,

allowing analyst and the team to focus on their Risk Reduction Efforts, which will be most

beneficial.

6.2.2 Identification of Hazards in Drilling and Production Testing Operations

Various hazards associated with onshore hydrocarbon drilling and testing operations are

briefly described in following sub-sections.

6.2.2.1 Minor Oil Spill

There exists a possibility of Hydrocarbon (gases / oil) getting released due to some

unavoidable incidents during the Drill Stem Testing. Spillage may occur from lines, valves

and separator or due to tank failure. Once the flow of Oil / Gas from well is stopped, then on-

site access for clean-up is possible.



6.2.2.2 Major Oil Spill

A major spill can arise as a result of an uncontrolled flow from a well i.e. Blowout. Provided

that ignition does not take place and the well head is not obstructed the well can be shut in at

the wellhead.

6.2.2.3 Blowout

Blowout means uncontrolled violent escape of hydrocarbon fluids from a well. Blowout

followed by ignition prevents access to the wellhead and is categorized as a major hazard.

Contributors to blowout are:

Primary

Failure to keep the hole full;

Mud weight too low;

Swabbing during trips;

Lost circulation; and

Failure of differential fill-up equipment.

Secondary

Failure to detect and control a kick as quickly as possible;

Mechanical failure of BOP;

Failure to test BOP equipment properly;

Damage to or failure of wellhead equipment;

Failure of casing; and

Failure of formation or bond of cementing around casing.

If the hydrostatic head exerted by the column of drilling fluid is allowed to drop below the

formation pressure, then formation fluids will enter the wellbore (this is known as a kick) and

can lead to a potential blowout situation. Fast and efficient action by operating personnel in

recognizing the above situations and taking precautionary measure can avert a blowout.

6.2.2.4 Hydrogen Sulphide (H2S)

Hydrogen sulphide gas (H2S) is extremely toxic, even very low concentrations can be lethal,

depending upon the duration of exposure. Without any warning, H2S may render victims

unconscious and death can follow shortly afterwards.

The Occupational Safety and Health Act (OSHA Regulations) set a 20 ppm ceiling limit and a

Peak exposure of 50 ppm for 10 minutes exposure. It has also set a TWA limit of 10 ppm for

an eight hourly continuous exposure and 15 ppm STEL limit for 15 minutes (OSHA, 1989).

Important characteristics of H2S gas are given as below:

H2S is a colourless gas heavier than air and may accumulate in low lying areas

It is toxic even in low concentrations

It has an odour of rotten eggs and may cause loss of sense to smell.

It occurs together with natural gas in all oil provinces of the world. In characteristic H2S

gas areas concentration above 42% in natural gas have been reported.



The compressibility factor (Z) is higher than that for natural gas and H2S will thus expand

at rather lower pressures; or further up in the bore hole than natural gas.

It burns with a blue flame to sulphur dioxide and may form an explosive mixture with air

at concentrations from 4% to 46%.

The safe concentration for a normal working period without protection is 10 ppm (as per

the TWA limit set by OSHA).

It attacks the body through the respiratory organs. The best protection is breathing

apparatus, with mask covering the whole face and a bottle containing breathing air.

It dissolves in the blood and attacks through the nervous system.

It is very irritating for the eyes as it forms sulphurous acid together with water.

Coughing, eye burning and pain, throat irritation, and sleepiness are observed from

exposure to low concentrations of H2S.

Exposure to high concentrations of H2S produces systems such as panting, pallor, cramps,

paralysis of the pupil and loss of speech. This is generally followed by immediate loss of

consciousness. Death may occur quickly from respiratory and cardiac paralysis. Short

exposure of high tensile steel to as little as 1 ppm in aqueous solution can cause failures.

Concentrations greater than 15 ppm can cause failure to steel harder than Rockwell C-22.

High stress levels and corrosive environments accelerate failures.

When pH is above 9 and solubility is relatively high, it is readily soluble in mud and

especially in oil mud‟s. A 35% hydrogen peroxide solution will neutralize H2S gas in the mud

or 20 gallons of H2O2 per 100 barrels of mud. The effect of H2S concentration on Living

Being/Human Being & Animal is given in Table 6.1.

Table 6.1: Symptoms of H2S as per Concentrations

Concentrations Symptoms/ Effects

100 ppm Coughing, eye irritation, loss of smell after 2-15 minutes

(olfactory fatigue).

Altered breathing, drowsiness after 15-30 minutes.

Throat irritation after 1 hour.

Gradual increase in severity of symptoms over several

hours. Death may occur after 48 hours.

Greater than 100 ppm Loss of smell (olfactory fatigue or paralysis).

500-700 ppm Staggering, collapse in 5 minutes. Serious damage to the

eyes in 30 minutes. Death after 30-60 minutes.

700-1000 ppm Rapid unconsciousness, "knockdown" or immediate

collapse within 1 to 2 breaths, breathing stops, death

within minutes.

1000-2000 ppm Nearly Instant Death

6.2.2.5 Natural Disaster and Hazards

The proposed drilling locations are falls in very severe intensity seismic zone. It is highly

vulnerable to high intensity earthquakes. Dozens of earthquakes are recorded in this region

every year. Extreme weather, strong wind and other natural hazards will also pose risk to

proposed drilling operations.



6.2.3 Development Drilling in ML Area of Golaghat and Jorhat Districts

The blocks are located in the Borholla ML area of Jorhat district having an area of 32.116 sq.

km. and Nambar, East Lakhibari, Khoraghat and Khoraghat Extension ML areas of Golaghat

district covering an area of 120.5 sq. km. The geo-graphical co-ordinates of the ML blocks are

given in Table 6.2.

Table 6.2: Co-ordinates of ML Areas

Block/

ML areas

Boundary

Points

Latitude Longitude


Borholla

ML

A 26 29 27.29 94 12 59.72

F 26 23 4.56 94 10 50.52

L 26 22 31.85 94 8 3.01

K 26 23 51.99 94 8 3.01

M 26 24 8.35 94 9 45.48

N 26 27 49.15 94 9 12.51

Nambar

N1 26 5 47.57 93 53 12.37

N2 26 4 46.23 93 56 7.45

N3 26 4 9.43 93 55 19.34

N4 26 3 25.27 93 56 3.89

N5 26 2 31.29 93 55 37.16

N6 26 2 37.43 93 52 5.45

East

lakhibari

1A 26 22 50.45 94 2 55.5

2B 26 22 5.45 94 4 25.5

3C 26 21 4.09 94 3 31.5

4D 26 22 7.2 94 0 54

1A 26 22 50.45 94 2 55.5

1A 26 22 50.45 94 2 55.5

2B 26 22 5.45 94 4 25.5

Khoraghat

1A 26 4 9.43 93 55 19.34

2B 26 4 46.23 93 56 7.45

3C 26 4 5.34 93 56 52.89

4D 26 3 25.27 93 56 3.89

1A 26 4 9.43 93 55 19.34

Khoraghat

Ext.

1A 26 5 47.57 93 53 12.37

2B 26 9 23.07 93 56 6.58

3C 26 9 12.44 93 59 55.55

4D 26 2 25.57 93 58 17.54



Block/

ML areas

Boundary

Points

Latitude Longitude


5E 26 2 31.29 93 55 37.36

6F 26 3 25.27 93 56 3.89

7G 26 4 5.34 93 56 52.89

8H 26 4 46.23 93 56 7.45

1A 26 5 47.57 93 53 12.37

The fuel for the drilling rigs, DG sets, other machineries and vehicles will be Diesel (HSD

with low sulphur < 0.05%). Daily fuel requirement for diesel sets will be 6 klpd. The HSD

will be stored in storage tanks (2 nos.) of 40 kl capacity. The exhaust stacks of the DG sets are

likely to vent the emissions. The Bulk Hazardous Chemical Storage Facility at Drilling Site

(Tentative) is given in Table 6.3.

Table 6.3: Bulk Hazardous Chemical Storage facility at Drilling site (Tentative)

Compound Stored Quantity

HSD (low Sulphur) 40 kl

(2 nos. of Storage Tanks)

6.2.4 QRA Approach

Identification of hazards and likely scenarios (based on Level-1 and Level-2 activities) call

for detailed analysis of each scenario for assessment of Damage Potential, Impact Area (may

vary with Weather Conditions / Wind Direction) and Safety System in place. Subsequently

each incident is classified according to Relative Risk Classification provided in Table 6.4

below.

Table 6.4: Risk Classification

Probability Description

High

(> 1/100)

A failure which could reasonably be expected to occur within the

expected life time of the plant.

Examples of high failure likelihood are process leaks or single instrument

or valve failures or a human error which could result in releases of

hazardous materials.

Moderate

(1/100

to

1/1000)

A failure or sequence of failures which has a low probability of

occurrence within the expected lifetime of the plant.

Examples of moderate likelihood are dual instrument or valve failures,

combination of instrument failures and human errors, or single failures of

small process lines or fittings.

Low

(<1/1000)

A failure or series of failures which have a very low probability of

occurrence within the expected lifetime of plant.

Examples of „low‟ likelihood are multiple instruments or valve failures or



Probability Description

multiple human errors, or single spontaneous failures of tanks

Nature Description

Minor

Incidents

Impact limited to the local area of the event with potent for

„knock – on- events‟

Serious

Incident

One that could cause:

Any serious injury or fatality on/off site;

Property damage of $ 1 million offsite or $ 5 million onsite.

Extensive

Incident

One that is five or more times worse than a serious incident.

6.2.4.1 Damage due to Explosion

The explosion of oil or gas (either a deflagration or detonation) results in a reaction front

moving outwards from the ignition source preceded by a shock wave or pressure front. After

the combustible material is consumed the reaction front terminates but the pressure wave

continues its outward movement. In oil development the likely chances of explosion (due to

blow out and consequential release of NG) are very less. Blast damage is based on the

determination of the peak overpressure resulting from the pressure wave impacting on the

object or structure. Damage estimates based on overpressure are given in Table 6.5 below.

Table 6.5: Damage due to over pressure

Sl.

No.

Overpressure

(bar) Damage

1. 0.04 Loud Noise / sonic boom glass failure

2. 0.15 Typical pressure for glass failure

3. 0.5 - 1 Large and small windows usually shattered

4. 0.7 Minor damage to house structure

5. 1 Partial demolition of houses, made uninhabitable.

6. 2.3 Lower limit of serious structure damage

7. 5 – 7 Nearly complete destruction of houses

8. 9 Loaded train box wagons completely demolished

9. 10 Probable total destruction of houses

10. 200 Limits of crater lip

6.2.4.2 Thermal Incidents/ Fire in Storage Area

The diesel storage on the drilling site is limited to 40 kl of storage tanks (2 nos). Any fire in

the tank area if not controlled in time (less chances/ unlikely) may soon spread in the drilling

site. During blow out some Natural Gas coming out with some oil can also catch fire.

However its thermal radiation impact (1st degree burn) will be limited (as the fuels are stored

in remote place).



Minor spill can occur as various scenarios and may also catch fire. If fire is not controlled

these can lead to domino effect as major scenarios. During the drilling crude oil, some well

water may come out which can be treated and disposed off or pushed back in the non-

producing well. The likely impact due to major scenario considered as given below in Table

6.6.

Table 6.6: Possible Major Scenarios

S. No. Scenario Impact Zone Remarks

1. HSD Tank failure, spillage & Fire

(~ 5 m Pool fire)

~ 8.5 From edge of

pool

The impact due to the above scenarios will be within the rig area. It may have some impact on

the nearby vegetation but will not have any impact on local population.

6.2.5 Mitigation Measures

6.2.5.1 Control Measures for Major Hazards

Out of different hazards described in sections 6.2, occurrence of (a) Blowout and (b) Emission

of Sour Gas (H2S) are the two major hazards and (c) HSD spillage/ fire. The first two possible

incidents can have built in alarm and preventive measures (as more likely to occur if system

fails). The third incident has remote chances and more likely due to some domino effect

caused by other incident. Occurrence of H2S along with oil and gas, if detected in any new

well, is the major hazard during production testing of each well. Control measures for

occurrence of blowout and Emission or Leakage of H2S gas are discussed in following sub-

sections.

Blowout

The precautionary and control measures used for blowout prevention are discussed below:

A. Precaution against Blowout

(i) The following control equipments for Drilling Mud System shall be installed and kept in use

during Drilling Operations to prevent the Blowout:

A Tank Level Indicator registering increase or reduction in the Drilling Mud Volume and

shall include a visual and audio –warning device near the Driller Stand.

A device to accurately measure the volume of Mud required to keep the well filled at all

times.

A Gas Detector or Explosimeter at the Primary Shale Shaker and connected to audible or

visual alarm near the Driller Stand.

A device to ensure filling of well with Mud when the string is being pulled out.

A control device near driller stand to close the Mud Pump when well kicks.

(ii) BOP Drill shall be carried out as per OMR & OISD.

(iii) BOP Control Unit shall be kept available near the well which can be used in case of

Emergency to control the Well.

(iv) When Running In or Pulling Out tubing, Full Opening Safety Valve (FOSV) shall be kept



readily available at rig floor.

B. Precaution after Blowout

On appearance of any sign indicating the Blowout of well, all persons, other than those whose

presence is deemed necessary for Controlling Blowout, shall be withdrawn from the Well.

During the whole time while any work of Controlling a Blowout is in progress, the following

precautions shall be taken:

(i) A competent person shall be present on the spot throughout.

(ii) An area within the 500 meters of the well on the down wind direction shall be demarcated as

Danger Zone.

All Electrical Installations shall be de-energized.

Approved Safety Lamps or torches shall only be used within the Danger Zone.

No Naked Light or Vehicular Traffic shall be permitted within the Danger Zone.

(iii) A competent person shall ascertain the condition of ventilation and presence of gases with an

approved instrument as far as Safety of persons is concerned.

(iv) There shall be available at or near the place, two approved type of self containing Breathing

Apparatus or any other Breathing Apparatus of approved type for use in emergency.

(v) Adequate Firefighting Equipment shall be kept readily available for immediate use.

6.2.5.2 Control Measures for H2S Leakage/Emission during Drilling

The following control measures for H2S will become necessary if presence of H2S is detected

at any new well.

A. H2S Detection System Presence

A four channels H2S gas detection system should be provided. Sensors should be positioned

at optimum points for detection, actual locations being decided on site but likely to be:

Just above Riser/Flow Nipple

Shale shaker

The detection system should be connected to an Audio Visual (Siren and Lights) Alarm

system. This system should be set to be activated at a concentration of 15 ppm H2S.

The Mud Logging will have a completely independent Detection System which is connected

to an alarm in the cabin. This system will be adjusted to sound an Alarm at a concentration

level of 10 ppm H2S as suggested in the Drilling and Production Safety Code for Onshore

Operations issued by The Institute of Petroleum.

A stock of H2S scavenger will be kept at drilling site for emergency use.



B. Small Levels of H2S

Small levels of H2S (less than 10 ppm) will not activate the well site alarms. Such levels do

not create an immediate safety hazard but could be a first indication of high levels of H2S to

follow.

H2S will cause a sudden drop of mud pH. The Mud Engineer/Mud Services will therefore

organize and supervise continuous pH checks while drilling. Checks should be as frequent as

possible and always made following a formation change.

Following control measures will be taken in case of small level of detection:

Add H2S scavenger to mud.

Check H2S levels at regular intervals for possible increase.

Inform all personnel of the rig about the presence of H2S and current wind direction.

Commence operations in pairs.

Render sub base and cellar out-of-bounds without further checking levels in this area.

C. High Levels of H2S

Higher levels of H2S (greater than 10 ppm) do not necessarily cause an immediate safety

hazard. However some risk does exist and, therefore, any levels greater than 10 ppm should

be treated in the same manner. Occurrence of 10 ppm or more H2S concentration will sound

an alarm in the mud logging unit.

If higher levels of H2S (greater than 10 ppm) are found, following steps will be taken:

Driller to Shut Down Rotary, pick up Kelly, close BOP and Shut Down Pump.

One pre-assigned roughneck will go to doghouse and put on breathing apparatus. All

other Rig Personnel will evacuate the rig and move in Up-Wind direction to Designated

Muster Point.

Driller and roughneck will return to the rig floor and commence circulating H2S

scavenger slowly and reciprocating pipe.

The level of H2S will be checked in all work areas. H2S Scavenger will be added to the

Mud and circulated. If H2S levels drop, drilling will be continued with scavenger in the

mud. Approximately 30 % of hydrogen peroxide (H2O2) solution will neutralize H2S gas

in the mud at 20 gallon of H2O2 per 100 barrels of mud.

6.2.5.3 Natural Disaster and Hazards

Following measures will be adopted to minimize the risks of Natural Hazards:

Enactment of building codes and construction standards.

Adaption of earthquake resistant designing in the establishment of structures and

installation.

Adoption of Emergency Shut Down (ESD) mechanism.

Implementation of offsite and onsite DMP and ERP.

6.2.5.4 Fire Fighting Facility

Fixed Fire Fighting System as per Oil Industry Safety Directorate (OISD) Standard 189

should be in place.



Fire Water System

One water tank/pit of minimum capacity of 40m3 should be located at the Drilling Rig

Site.

For production testing, one additional tank of 40m3should be provided.

One diesel engine driven trailer fire pump of capacity 1800 lpm should be placed at the

approach area of drilling site.

One fire water distribution single line with minimum 4 “ size pipe/casing should be

installed at drilling site with a minimum distance of 15 m from the well.

First Aid Fire Fighting Equipments at Drilling Rig

Portable Fire Extinguisher will be installed as per IS: 2190 on the Drilling Rig. The minimum

quantities of fire extinguishers at various locations should be provides as per the following

(Table 6.7).

Table 6.7: Fire Extinguishers

Sl.

No. Type of Area Portable Fire Extinguishers

1. Drilling Rig floor 2 nos. 10 kg DCP type Extinguisher

2. Main Engine Area 1 no. 10 kg DCP type Extinguisher for each engine

3. Electrical motor/pumps

for water circulation for

mud pump

1 no. 10 kg DCP type Extinguisher

4. Mud Gunning Pump 1 no.10 kg DCP type Extinguisher

5. Electrical Control Room 1 no. 6.8 kg CO2 type Extinguisher for each unit

6. Mud mixing tank area 1 no. 10 kg DCP type Extinguisher

7. Diesel Storage Area 1 no. 50 lit mechanical foam

1 no. 50 kg DCP type Extinguisher

2 nos. 10 kg DCP type Extinguisher

2 nos. sand bucket or ½ sand drum with spade

8. Lube Storage Area 1 no. 10 kg DCP type Extinguisher

1 no. sand bucket

9. Air Compressor area 1 no. 10 kg DCP type Extinguisher

10. Fire Pump Area 1 no. 10 kg DCP type Extinguisher

11. Near Dilling In-charge

Office

One fire extinguisher/shed with 3 nos. 10 kg DCP

type extinguisher and 2 sand buckets

12. Fire bell near Bunk House 1 no. 10 kg DCP type Extinguisher

6.2.6 Occupational Health

Occupational hazards associated with onshore drilling include exposure to hazardous

substances, noise, vibrations, heavy manual handling activity at the site etc.



At Drill Site qualified doctor is available 24 hrs on the Drilling Rig for the Immediate

Treatment and First Aid. For serious injuries and diseases patient is evacuated by the

Emergency Vehicles exclusively meant for Emergencies to the Nearest Medical Center.

Health Hazard Control is done by adopting following measures:

Prioritize the health hazards based on their risk potential.

Identify specific work groups affected by each hazard.

Determine the controls required to manage these identified hazards. The cost of each

identified control versus benefits of its implementation may be evaluated.

Develop an action plan identifying work to be done.

The health and hygiene of the personnel working at the Drilling Rig for long period will be

monitored through periodic health checks of the persons. All employees undergo a periodic

medical examination. The record of the health check-up will be maintained centrally off site

in confidential file by the medical section. The medical officer at base recommends

appropriate treatment for the persons found to be having any Health Problems requiring

attention.

During the proposed Drilling Operations, inspections of cleanliness are carried out. First aid

boxes are provided at different strategic locations on the drilling rig. The medical officer on

board shall regularly inspect the First Aid Boxes and ensures that their contents are in order.

Majority of the employees on the drilling rig are trained in First Aid. Regular Drills and

Lectures on First Aid are carried out at the Rig. Occupational Health Surveillance Program is

summarized in Table 6.8.

Table 6.8: Occupational Health Hazards and Mitigating Measures

Cause of health hazard Risk Mitigation Measures

Noise (Generators, Cranes, Rig,

Movement of Vehicles, etc) Hearing loss

Use of PPEs in high

noise area and written

Standards Operating

Procedures (SOP) to be

followed.

Procedures to be

followed as per Material

Safety Data Sheet

(MSDS) of all hazardous

chemicals for safe

handling.

Handling of heavy equipment

and material (Manual handling

of material)

Back problem

Handling of chemicals

(Chemical stores, Chemical

dosing areas, Chemical labs, etc)

Eye problems and

chemical ingestion,

Dermal effect of

chemicals

6.2.7 Frequency of Occurrence of Accident Scenario

Frequency of Occurrence of incident is important in risk analysis. Standards Operating

Procedures (SOP), Proper Maintenance and Safety Precaution reduce the Frequency of

occurrence of such Incident. The data sources referred for failure frequency is E&P Forum

(Oil Industry International Exploration & Production Forum) frequency data base from TNO

(“Toegepast Natuurwetenschappelijk Onderzoek”, a Netherlands Organisation for Applied

Scientific Research) and Failure Frequency Data from the Rijmond Report (COVO Study,



“Risk analysis of six potentially hazardous industrial objects in the Rijnmond area, a pilot

study”, prepared and submitted by COVO (Dutch abbreviation for Commission for the Safety

of the Pollution at large) Commission report to the Rijnmond public authority, Netherlands).

The frequency occurrences for various scenarios are given below in Table 6.9.

Table 6.9: Frequency Occurrence for Various Accidents Scenarios

Sl. No. Scenarios Frequency of Occurrence

1. Catastrophic failure of largest

nozzle connection in HSD tank

1/1,000,000 per tank per year

Probability of Ignition

Immediate Ignition 65/1000

Delayed Ignition 65/1000

No Ignition 87/100

2. Catastrophic failure of Tank 67/1,00,00,000 per tank per year

Safety precaution, proper maintenance of equipment and risk mitigation measures adopted in

storage and handling of inflammable materials will reduce the probability of occurrence of

hazardous incident.

6.2.8 Conclusions

Hydrocarbon Vapour Concentration Detector should be installed at some critical. Lower

Flammability Limits (LFL) for some gaseous hydrocarbons are as under:

Compound LFL (% in air)

Methane 5.0

Ethane 3.0

Propane 2.1

Butane 1.6

6.3 DISASTER MANAGEMENT PLAN

For meeting the emergencies caused by major accidents, planning response strategies are

termed as Disaster Management Plans (DMPs). DMPs cannot be considered in isolation or act

as a substitute for maintaining good safety standards at a project site. The best way to protect

against major accidents occurrence is by maintaining very high levels of safety standards.

The Offsite & Onsite Disaster Management Plan (DMP) and Emergency Response Plan

(ERP) are available for existing facilities in the ML Blocks, which are also extended to

proposed activities. Details on existing facilities are given in Table 6.10. The scope of the

DMP On-site Emergency Preparedness Plan is to evaluate the various types of emergencies

that can occur at rig installations and processing/production facilities (Drilling and Production

activities) and to formulate emergency plans, procedures that can be implemented by ONGC

in house. In case the contingency exceed in dimension beyond ONGC‟s capability, the off-

site Emergency plan shall be activated concurrently with the help of District administration.



Table 6.10: Existing GGS Stations within the ML areas

Sl.No. ML Area Proposed

Wells

Collection

stations Transportation

1 Nambar ML

area

04 2 GGS already

functional in

Nambar area

through pipelines

At the GGS, the oil

and gas will be

separated, Oil will be

transported to Nambar

GGS-1 and gas will be

supplied to the

consumer

2 Khoraghat

and

Khoraghat

Ext. ML area

03 2 GGS already

functional in

Khoraghat area

through pipelines

At the GGS, the oil

and gas will be


transported to

Khoraghat GGS-1 and

gas will be supplied to

the consumer

3 East

Lakhibari

ML area

01 Well will be

produced through

Early Production

system, in which

separator and

tanks are used

Produced oil & gas

from the wells will be

transported to Borhalla

GGS through tankers

4 Borholla ML

area

04 2 GGS already

functional in

Borholla area

through pipelines

At the GGS, the oil

and gas will be


transported to Borholla

GGS and gas will be

supplied to the

consumer

6.3.1 Statutory Requirements

1. Oil Mines Regulation, 1984 of Mines Act 1952

Contingency plan for Fire shall be prepared for any oil installation – OMR 1984.

2. Environment Protection act and the rules:

In exercise of the provisions under the Environment Protection Act 1986, the „Manufacture,

Storage and Import of Hazardous Chemicals Rules‟ came into force in November 1989.

Under these rules, „Preparation of On-site Emergency Plan‟ is covered in Rule No.13 and

„Preparation of Off-site Emergency Plan‟ in Rule No.14,

6.3.2 Nature of Emergencies

In ONGC, have three tiers of Emergency Preparedness at Work centers:

1. A unit specific emergency (ERP): A unit specific emergency response plan is a plan

prepared by every unit considering the emergency scenarios envisaged in the risk register. In

case of emergency respective installation activates emergency response plan (ERP) and the

emergency is mitigated with the facilities available within the installation. The ERP is

activated by the Installation Manager.



2. On-site emergency (On-site DMP): The On-site Disaster Management plan is activated in

case the emergency requires mobilization of resources from the other units / Asset. This plan

is activated by the Chief Emergency Coordinator (CEC), Asset Manager and will exercise

control through the Asset Emergency Control Room (ECR).

3. Off-site emergency (off-site DMP): The off-site disaster management plan will be put into

action in the following situations:

i) In case of an Onsite emergency spreads beyond the boundary of installation and

causes damage to the life or property outside the boundary.

ii) In case an emergency originated from outside the premises of the installation/Drilling

Rig/Work over Rig which is likely to effect the operations of installation.

The off-site emergency requires mobilization of resources beyond ONGC capabilities such as

state emergency services.

6.3.3 Onsite Emergency Organization

The Asset Manager is head of the On-site emergency organization and is designated as the

Chief Emergency Coordinator (CEC) at Asset level. He will exercise control through the

Asset Emergency Control Room (ECR). The CEC is assisted by an expert team drawn from

various disciplines.

The Chief Emergency Coordinator (CEC) will assume control through the Assistant

Emergency Coordinator (AEC). The emergency coordinator (CEC) may appoint Surface

Manager / Head Drilling Services / Head Well Services as Assistant Emergency Coordinator

(AEC). The flow chart of onsite emergency organisation is shown in Figure 6.1.



Figure 6.1: Onsite-Emergency Organization

6.3.3.1 Functions & Responsibilities of Various Coordinators

The specified functions and responsibilities of the different coordinators are elaborated.

These are the emergency functions and therefore the normal time functions become void. All

the coordinators will assume their emergency roles immediately without any time lag.

Chief Emergency Coordinator (CEC): Asset Manager will be the Chief Emergency

Coordinator for all the Emergency Management activities at the Emergency Control Centre.

Establish a control centre and will be In-charge of the entire on-site emergency operation.

Passing on information to relevant persons and agencies and also warning and advising

people who are likely to be affected.

Convene an emergency meeting of all coordinators to discuss issues such as Rescue

operations, Evacuation, Mobilizing the foods and also plans to augment the manpower.

Get feedback from all coordinators on the latest developments, other information and

requirements at frequent intervals to decide on the future course of action.



Arrange to operate Mutual Aid Scheme through Head HSE. In case of Major Fire /

Explosion he has to get mobilized force and appliance from State / Municipal Fire

Service.

In case On-site emergency is escalating and speeding to an off-site emergency, the matter

to be informed to the District Collector to enable them trigger off-site emergency plan

activities to combat emergency.

Assistant Emergency Coordinator (AEC): In case of an emergency in production operations,

the Surface Manager will assume the responsibilities of AEC. He will work under the orders

of CEC. The responsibilities are:

Assessment of the gravity of the situation and to declare the state of emergency

Establishment of Site Control Room (SCR)

Mobilization of resources

Control of logistic support

Control of rescue operations

Supervision of Medical attention to injured

Oversees all situation reports

Organizes all Post emergency operations

On-Scene Coordinator (OSC): The senior most person or the Installation Manager will

assume the role of OSC, unless otherwise directed. In case of abandoning the installation in

distress, the In-charge of the nearest Installation will take over the role of OSC. CEC may

also appoint a person from base to take over the task of OSC at Site Control Room.

On-scene coordinator is the key person in emergency situation. After receiving the message,

shall reach the spot immediately.

He will take control of Fire Fighting operation / damage control measures till the arrival of

Incharge Fire.

In coordination with Incharge Fire, arrange to take all steps to control emergency situation.

Closely monitor the emergency situation and change action plan as per need.

In case of Major / Serious Emergency arrange to blow all clear siren when the emergency

situation is under control.

Key Personnel: Key personnel for respective services, depending upon the nature of the

emergency shall arrive at the site to take charge of their respective positions such as Logistics

Coordinator, Safety (HSE) Coordinator, Fire Coordinator, Finance Coordinator, Medical

Coordinator, Communication Coordinator etc.

6.3.3.2 Emergency Control Room (ECR) at Base office

An emergency control room (ECR) will be set up at base office in radio room under the

control of Chief Emergency coordinator (CEC). Management decisions and plans will be

conveyed from ECR to emergency site by AEC. From Site Control Room (SCR) all

developments at emergency site will be communicated to ECR at base.



6.3.3.3 Responding to an Emergency

The procedures for combating emergency situations viz. Blowout at a rig, release of toxic

gases in an uncontrolled manner, fire or explosion are defined as emergency procedures.

There are written laid out action sequences to be followed while fighting an emergency.

1. A person who detects say a fire, an explosion or a leak of hazardous gas should shout

“Fire, Fire, Fire” Help, Emergency as applicable” and communicate the event to the

people all around and to Shift I/C by using fire alarm / bell.

2. Should attempt to control or contain the emergency with the available resource if

possible.

3. The emergency actions are put into action immediately by the Shift In-charge / Tool

Pusher / Rig Manager, who then assumes the role of On Scene Coordinator (OSC). He

then accesses the nature of emergency and informs AEC regarding requirement of crisis

management team if any to mitigate the emergency.

4. The “Crisis Management Team” arrives at the scene and joins hands with the site crew,

other supporting team to further combat the crisis under the guidance of the OSC and

AEC.

5. A buddy team is created from the available manpower and kept as standby to the main

team.

Assembly point

At every drill site, assembly point is identified as Safe Assembling point during an

emergency. People working in the field and who do not have any direct role in Emergency

Situation will quickly assemble here and wait for any instructions from the OSC or AEC.

Emergency procedures in the event of blowout

A blow out situation is a consequence of uncontrolled flow of oil / gas and there is every

likelihood of fire being triggered off. To tackle such an emergency situation the flow of action

can be divided into following two steps.

Step - I : Action on the spot - On-site.

Step - II : Action of Asset in co-ordination with Basin.

The various functions with regard to these steps have been elaborated in the form of action

flow sequences and kick control procedures. With a view to avoid overlapping of functions,

the various actions required to be taken during a blowout have been identified and the

personnel responsible for taking actions have been specified.

The position of blowout well being different in different cases the exact action plan of work to

control the blowout spill / blowout fire and for capping of the well would be finalized by

competent authorities of the Asset / Basin / Headquarters.

Functions of On-Scene Coordinator (OSC)

Take charge of the situation at the rig and follow the standing instruction given below



Evacuate all personnel to safe site.

Switch off engines and generators.

Remove and secure all well records.

Avoid and extinguish all naked flames / sparks.

Pull out all inflammable materials i.e. HSD, Petrol, Gas Cylinders, Chemicals etc. from

well premises.

Pull out all possible equipments to safe distance.

Start spraying water on well mouth to keep it cool.

Cordon off the area and do not allow entry of any unauthorized person. Allow only the

persons directly involved in operations to go near blowout well and maintain record of

such persons.

Intimate Emergency Control Room (ECR) at base for deployment of additional

manpower, materials, logistics / transport arrangements and technical support if any.

Keep in touch with ECR through Site Control Room (SCR) for update, feedback and

instructions from base.

Assign responsibilities to the concerned persons to control the situation.

Evacuate all equipments and materials to safe location if required.

Make record of following information for forwarding to Emergency Control Room (ECR) at

base:

Well condition.

Position of drill string / Tubing string in the well.

Last tubing and annulus pressure recorded.

Number, Name and Designation of persons at site, measures initiated to meet the

situation, details of injury / casualty, if any.

Emergency procedure for Control of Kick

A kick during drilling or work over operations is an event preceding a blowout. A blowout

situation is never sudden and almost always follows after several indications or pointers. A

kick is sudden outflow or upsurge of the drilling mud or work over fluid due to unexpected

encountering of a gas zone or high pressure fluids, which throws out the fluids upwards out of

the well bore. The kick of the out flowing fluid needs immediate remedial attention lest it

assumes a more dangerous form of blowout. The remedial action by the crew and the kick

control procedures are elaborated below.

Duty guidelines for Rig operational crew

All operations will be carried out under the control and guidance of the Shift In-charge / Tool

Pusher, who then functions as the OSC.

When a kick is detected, the Shift In-charge will give a signal and all members of the crew

will take up their respective positions. The signals will be in the form of short sirens in a

continuous manner from the driller‟s console.



SHIFT IN-CHARGE

(SIC)

Stand on brake and control as necessary. Supervise all

activities to control the situation.

Ensure functioning of BOP and choke manifold lines.

Ensure help is provided to Chemist in order to maintain mud

parameters as directed by authorities.

Ensure safe removal of records, men and materials to safe

and secure place.

ASSISTANT SIC

Be available at control panel of BOP to operate as per

direction of RM / SIC / AE(D) / AEE(D) and the guidelines

issued to close BOP, install Kelly cock etc.

Keep watch on pressure on discharge line, stand pipe and

annulus pressure and increase in mud volume in the pit /

tanks.

Help Chemist in preparation of mud and maintaining mud

parameters as required.

Ensure operation of degassing unit, if any. Also keep watch

for rise in mud level in the suction tank.

Work on choke line / kill line of BOP.

- Keep watch on the float in the mud pit for loss or gain

of mud and inform SIC the status and request SIC to

alert site personnel of impending danger.

TOP MEN Both of them will work on choke-line and valves.

RIG MEN They will help the SIC in fitting NRV / Kelly etc. and will

be available at derrick floor.

RIG ENGINEER (M) To be near the engine waiting for directives from SIC.

FITTER

To be available near the pump and will give pump

connection as and when advised by SIC / Chemist.

RIG ENGINEER (E) To be available near BOP panel board and will attend

electrical work if any needed for charging the accumulators.

CHEMIST

To liaison with SIC and calculate kill mud weight as per

available data and take necessary steps to prepare mud as

per requirement. It must be ensured however, it should be

checked at the time of kick control and SIC should be

informed of condition.

GEOLOGIST

To keep contact with the SIC and keep him abreast of

possible reservoir condition and convey the data recorded at

Mud Logging Unit.

SECURITY GUARD

To see that no unauthorized person enter the site. He should

remain at the drill site and not allow the villagers to

assemble near the gate. He should ensure that there is no

open fire nearby.



OTHERS

To assemble near the bunk house or storehouse within full

view of SIC so that any of them is summoned by SIC at the

time of need. They should also ensure that there is no open

fire at the site and nearby area.

After above mentioned steps are completed, all lines, valves, closed position of BOP are to be

inspected by shift In-charge and certified.

Well Kick Shut in procedure for On Land and Jack up Rigs

A well kick shut in procedure for On-land and Jack up rigs as listed below is adopted from

OISD STD 174.

i) Shut in procedure while drilling

1. Stop rotary

2. Pick up Kelly to clear tool joint above rotary table.

3. Stop mud pump, check for self-flow. If yes, proceed further to close the well by any of

the following methods for shut in the well as shown in Table 6.11.

Table 6.11: Shut in Procedure while Drilling

Sl.

No. Soft Shut – in Hard Shut – in

1. Open hydraulic control valve

(HCR valve) / manual valve on

choke line.

Close Blow out Preventer.

(Preferably Annular Preventer)

2. Close Blowout Preventer. Open HCR/Manual valve on choke line

when choke is in fully closed position.

3. Gradually close adjustable

/remotely operated choke,

monitoring casing pressure.

Allow pressure to stabilize and record

SIDPP, SICP and Pit Gain.

4. Allow the pressure to stabilize and

record SIDPP, SICP and Pit gain. ----------

SIDPP – Shut In Drill Pipe Pressure

SICP – Shut In Casing Pressure

FOSV - Full Opening Safety Valve

ii) Shut in procedure while tripping

1. Position tool joint above rotary table and set pipe on slips.

2. Install Full Opening Safety Valve (FOSV) in open position on the drill pipe and close it.

Following methods are recommended for shut-in the well as shown in Table 6.12.



Table 6.12: Shut in Procedure while Tripping

Sl.

No. Soft Shut – in Hard Shut – in

1. Open hydraulic control valve (HCR

valve)/ manual valve on choke line.

Close Blow out Preventer.

(Preferably Annular Preventer)

2. Close Blowout Preventer. (Preferably

Annular Preventer) Make up Kelly and open FOSV.

3.

Gradually close adjustable/ remotely

operated choke, monitoring casing

pressure.

Open HCR/Manual valve on choke

line when choke is in fully closed

position.

4. Make up Kelly and open FOSV Allow pressure to stabilize and record

SIDPP, SICP and Pit Gain.

5. Allow the pressure to stabilize and

record SIDPP, SICP and Pit gain. ------

iii) Shut in procedure when string is out of hole

1. Close blind/shear ram.

2. Close adjustable/remotely operated choke and open HCR valve.

3. Record shut in pressure.

6.3.4 Offsite Emergency Plan

The OFF-SITE Emergency Plan for existing processing/production facilities of ML areas in

ONGC, Assam Asset is a compilation of various emergency scenarios. It also includes the

probable impact on „off the site‟ due to emergency and the action plan to combat / mitigate

the consequences of a disaster situation.

6.3.4.1 Assessment of Hazard leading to Off-Site Emergency

The hydrocarbon produced from the Borholla ML area of Jorhat district and Nambar, East

Lakhibari, Khoraghat and Khoraghat Extension ML areas of Golaghat district was transported

to existing processing/production facilities through trunk lines and tankers. No. of person

working in each of the installation may vary from 25-30 per shift. The equipments at the

installation mainly consist of bank of separators, storage tanks and oil dispatch pumps. Crude

oil is always stored in bulk.

Fire is the most common hazard in a Crude Oil and Natural Gas processing operations and

there are also possibilities of explosion and toxic gas dispersion which can arise due to the

severe operating and storage conditions. Any incident of the above nature is likely to cause

extensive damage to the plant property and personnel.

Disaster situation arising out of the hazards encountered in the above mentioned installations

is normally not expected to affect beyond 200m. An estimated maximum area within 1.0 - 1.5

Km radius can be considered for declaration as emergency or danger zone.



Outside the premises of the these installations, environmental hazards are likely to occur due

to the leakage / bursting of either trunk pipeline or flow lines from wells and flaring of natural

gas.

Hazard in Flow Lines: A pipeline connecting one installation to another installation is termed

as a trunk line while a pipeline connecting hydrocarbon well to the installation is called as a

flow line.

The trunk pipeline and almost all the well flow lines pass through the agricultural fields. The

trunk and flow lines are sub-surface pipelines and are laid 1.2 m below the ground level. Due

care has been taken during laying of trunk and flow lines. As far as possible laying of

pipeline is avoided in populated area. The main risk in transportation of oil / gas through

pipeline is leakage of oil / gas which may result in fire if source of ignition is present. Once,

detected, the emergency procedure will be activated and remedial action will be taken to

control the leak, spread of fire etc. Moreover, no major evacuation is required as pipelines are

passing through non populated areas.

Hazard in Transportation of Condensate by Tankers: The crude oil is transported through

road tankers from various isolated installations within the Asset to processing/production

installation. There is a chance of oil spill due to overturning or collision of tankers. In this

case, a small quantity of crude oil is likely to be spilled. When an emergency arises the

nearby police station may be contacted to cordon off the affected area and all sources of

ignition are removed to safe distance to avoid fire. Nearby public is instructed not to light any

source of ignition. Efforts should be made to stop the flow of oil into nearby water bodies to

avoid water contamination. For this purpose, improvised booms made of bamboo‟s plants

etc. can be rigged up to contain the oil and prevent its spreading.

6.3.4.2 Disaster due to Man-made causes (Terrorist attack)

Other than above technical and operational hazards ONGC units also poses disasters due to

man-made causes such as Terrorist attack, Bomb threats. The action plan for these scenarios

is as below:

i) IED Attack

Primary rule

If a suspected device is encountered, it should not be handled and the area should be secured.

Improvised explosive devices are very unstable. They are extremely sensitive to shock,

friction, impact, and heat, and may detonate without warning. Even the smallest devices can

cause serious injury or death.

Secondary rule

Always assume that there is more than one device present, whether any other bomb or a

device has been located.

Package-type IEDs: Institute security procedures in receipt and dispatch section and

instruct employees on how to recognize suspicious packages.



Luggage-type IEDs: Train security personnel and employees regarding

unattended packages of any type. Never pick up or open any suspicious package or

piece of luggage. If an IED is discovered, call the police and do not touch the device.

Vehicle-borne IEDs: Perform a vulnerability/threat assessment for the facility with

special attention to this type of explosive delivery mechanism. Consider the use of

enhanced security away from your key buildings (such as a vehicle checkpoint) or the use

of bullards or barriers to block vehicular access to building entrances.

ii) Chemical Attacks

A chemical emergency occurs when a hazardous chemical has been released and has the

possibility of harming people‟s health. Potentially lethal, chemical agents are difficult to

deliver in deadly amounts. If released outdoors, the agents often dissipate rapidly. As such,

the most lethal area for a chemical release is inside a confined space, such as a building,

public place, or subway system.

Industrial chemicals, while not as lethal, can be just as effective if released in sufficient

quantities. Chlorine, ammonia, benzene, and other toxic chemicals are routinely transported

through densely populated areas in rail tankers or truck tankers and could be the target of a

terrorist attack.

Chemical terrorist attacks will most likely be overt because the effects of most chemical

agents are immediate and obvious. Your response will have to be thought out and practiced in

advance to be effective.

Evacuation

Some types of chemical emergencies will require evacuation from the immediate area. If you

are up-wind and in the open, evacuate up-wind and away from the incident. Cover your

mouth and nose with a damp cloth. If you have been exposed, you will have to be

decontaminated by first responders.

Shelter in Place

If you are already in down-wind and/or in a multistory building, you may be instructed to

shelter in place or to make that decision on your own. Most likely you will only need to

shelter for a few hours. The procedure includes:

Go inside as quickly as possible shut and lock all windows and doors; turn off all

HVAC equipment and any fans.

If you have multiple floors, go as high as practical, three to five floors. (Most chemical

agents are heavier than air.)

If you have duct tape, tape over door and window

cracks, vents, electrical outlets, and any opening to the outside.

Wait for instructions from first responders before leaving.

iii) Biological Attacks

A bio-terrorist attack could happen in any workplace, yet most company personnel know little

about potential bio-toxins or bio-pathogens or how to recognize these agents and respond in

the event of an attack.



There are several ways a bio-terrorist event may manifest itself. The biological event may

result from a covert attack. A covert attack may be unleashed by the receipt of an object, such

as a package or piece of mail, accompanied by a warning or threat. For example, release of a

biological agent could occur through delivery of a package contaminated with anthrax spores

or another pathogen. Biological agent release also could occur via the ventilation system

(HVAC) in a building, where dispersal could take place within a matter of minutes. Because

the covert release is not witnessed, the effects of such an event can be widespread and

difficult to isolate or recognize.

While terror is intended to produce casualties, disruption, and fear, the use of biological

agents is particularly injurious. Biological attacks are delayed events. The sudden appearance

of generalized symptoms in victims who present themselves to medical providers may

initially disguise the true source of exposure. Only when a trickle of patients turns into a flood

or mysterious pathogens quickly make their presence felt does the magnitude of the event

reveal itself.

The goal of the medical care community (i.e., hospitals, physicians, and other health care

providers) is to recognize and diagnose the disease (which frequently may be unfamiliar to

most clinicians) and to provide treatment. The goal of public health authorities is to detect and

control the outbreak of the illness. Public health officials will focus on identifying and

treating exposed persons and preventing the spread of disease.

In response to a covert release, it is important for ONGC health officials to recognize the

signs and symptoms of an emerging disease among employees. If an overt release is

recognized, take immediate action to isolate the exposed employees and/or area of agent

dispersion and to remove others from the area of release. Notify local public health authorities

immediately and follow their directions. Decontamination may also be warranted in response

to an overt release.

iv) Radiological Attacks

A radiological weapon or “dirty bomb” is a crude device that combines a conventional

explosive with highly radioactive material. When detonated, the blast vaporizes the

radioactive material and propels it across a wide area.

The main danger from a dirty bomb is the initial blast, which could cause serious injury or

property damage. The radioactive materials will likely not be concentrated enough to cause

immediate serious illness, except to those very close to the blast site or those who inhale

smoke and dust. Dirty bombs are designed to cause tremendous psychological damage by

exploiting the public‟s fear of radiation. These are not weapons of mass destruction, but

weapons of mass disruption aimed at wreaking economic havoc by making target areas

uninhabitable for extended periods.

There are three basic ways to reduce your exposure:

1. Reduce the time near the source of radiation,

2. Increase the distance from the source of radiation,

3. Increase the shielding between person and the source of radiation. Shielding is anything

that puts distance and mass between person and the radiation source.



Evacuation

If a person is outside, evacuate up-wind from the blast site cover the nose and mouth with a

wet cloth to reduce the risk of inhaling radioactive smoke or dust. Once out of the immediate

area, seek shelter and wait for instructions from first responders. If individual has been

exposed to dust or smoke, follow the decontamination procedure.

Shelter in Place

If a person is close to the blast and inside a building, stay inside if the building is intact. Move

to the basement and turn off all HVAC equipment and fans bringing in outside air it is not

necessary to seal doors and windows, but it may be helpful. Wait for instructions from

first responders.

6.3.4.3 Action Plan - Reporting of an Off-Site Emergency

The off-site disaster management plan will be put into action in the following situations:

a) In case of an Onsite emergency spreads beyond the boundary of installation and causes

damage to the life or property outside the boundary.

b) In case an emergency originated from outside the premises of the installation/Drilling

Rig/Work over Rig which is likely to effect the operations of installation.

The off-site emergency requires mobilization of resources beyond ONGC capabilities

such as state emergency services.

In case of an off-site emergency, the On-site Chief emergency coordinator (Asset Manager)

will report the matter to the District Collector, who is Chairman of District emergency

committee. Further, the Chairman will mobilize other members of District Emergency

committee as per the organization Chart for an Off-site emergency management (Figure 6.2).

Communication to Corporate Disaster Management Group (CDMG)

The Chief Emergency coordinator shall immediately inform CMD, Director (HR),-CCEC,

Director-concerned and Director-I/C HSE on the situation and his assessment for intervention

of Corporate Disaster Management Group (CDMG).



Figure 6.2: Flowchart for Offsite Emergency Management

Functions and responsibilities of emergency Committee

When a call is received from On-site Emergency coordinator regarding emergency / disasters,

District Collector, who is also chairman of the District Emergency committee, will initiate the

district level action plan to combat the emergency.

Responsibilities of Chairman of District Emergency Committee

a) Take overall responsibility for combating the off-site emergency.

b) Declare an area of 500 m or up to 1.5 Kms as felt appropriate around the site as a

“Hazardous Zone”.

c) Inform the District Police, Fire Personnel to combat the emergency. Arrange if

necessary, for warning and evacuating the public from the villages by the Superintendent

of Police.

d) Inform the team of Doctors headed by District Health & Medical Officer; also help and

support from nearby hospitals may be called for.

e) Inform the Regional Transport Officer to arrange for transportation of victims and

evacuation of people trapped within the hazardous zone.



f) Inform the Executive Engineer of state electricity department to give uninterrupted power

supply or de-energize power supply, as required.

g) Inform the Revenue Divisional Officer (RDO) and District supply officer to provide safe

shelter, food and other life-sustaining requirements for the evacuees.

Responsibilities and duties of members of Service group

In the implementation of the Off-site emergency plan a service group will assist the Collector

of respective district. This group consists of the following members from the district area &

has responsibilities as indicated.

District Collector Press and Public Relations

Superintendent of Police Warning & Advice to the

public security measures, Rescue & Evacuation

District Revenue Officer Coordinates Transport, Civil

Supplies, Health, Medical and other services.

Revenue Divisional Officer Rallying post

Regional Transport Officer Provide transport

Deputy Director Health To take care of Public Health & Preventive medicines

District Medical Officer Treatment of affected persons

Divisional Fire Officer Help in firefighting operations & rescue.

District Environmental

Engineer

Advice for protection of environment and reduction in

environmental losses

Joint Director, Animal

Husbandry

Taking care of cattle in the affected area.

Joint Director, Agriculture Taking care of standing crops

Executive Engineer, State

Electricity Department

Ensuring uninterrupted powers supplies or de-energizes

power supply as required.

6.3.4.4 Mock Drill for Onsite and Off-Site Emergency Management

ONGC may conduct Mock Drill to check the efficacy of Onsite and Off-site Emergency plan

for review and updation in association with Government officials.

Once in every year this plan will be practiced on field mock exercise involving dramatized

scenarios to test the communication system, action plan and response of all Key agencies

within ONGC and Government officials. Such on field mock exercise will be selected from

high risk areas and near real approach of actual fire fighting / evacuation operations will be

undertaken. An emergency will be alerted through different types of Siren Sound Code

example fire, explosion, toxic release etc. Siren codes as per OISD STD 116 reproduced here

in Format-I will be followed.



Emergency Siren Codes

Scenario Siren Sound Code

Major Fire A wailing siren for two minutes. Siren should be sounded

three times for 30 seconds with an interval of 15 seconds.

Disaster Same type of siren as in case of Major fire, but the same will

be sounded for 3 times at the interval of 02 minutes.

Gas Leak A wailing sound for 2 min. 5 times for 20sec at 5 sec interval

Blow-out with Fire same as „Major Fire‟ Siren

Blow-out without

Fire

same as „Gas Leak‟ Siren

Air Raid As per guidelines of Air Defence Dept. of the area.

All Clear Straight run siren for 2 minutes

Test Run Straight run for 2 minutes

(Reference: OISD-STD 116, page 26)

Note: Sound for Gas situation and blow-out sirens have been devised internally, as it is not

mentioned in OISD-116.

During mock drill exercise observers would be appointed in key areas to take note of

individual responsibilities, response time and lapses. Every mock exercise will be followed

by “post – mock-drill meeting” to discuss the findings of observers and shortcomings. The

lessons learnt from such exercises will be summarized in the form of a report to improve upon

the overall preparedness and will also be used as inputs for updating the plan to the extent

necessary.

If in any case the exercise cannot be carried out due to operational reasons the same shall be

done as the table top exercise to test the communication system, action plan and response of

all Key agencies within ONGC and Government officials.

6.3.4.5 Review of the Plan

The off-site emergency plan will be reviewed by ONGC and District Emergency Committee

as per requirement and updated accordingly.

6.3.4.6 Blow Out Contingency Plan

The Contingency Plan for Blowout is shown in Figure 6.3.



Figure 6.3: Blowout Contingency Plan

F IRST AID

WELL IS OUT OF CONTROL- BLOW OUT DECLARED

RESTRICT THE ENTRY OF OUTSIDERS

ORGANISE HEAD COUNT

EVACUATE THE SITE

BLOW OUT

ORGANISE SEARCH AND

RESCUE

FOR MINOR INJURIES

MOBILISE THE PATIENT TO NEAREST HOSPITAL

BLOWOUT WITH FIRE BLOWOUT WITHOUT FIRE

EVACUATE SITE

WAIT FOR INSTRUCTIONS

GAS OIL

SPRAY WATER

WAIT FOR FURTHER

INSTRUCTIONS

TAKE POLLUTION CONTROL MEASURES

WAIT FOR INSTRUCTIONS

EVACUATE SURROUNDINGS IF H2S PRESENTS

TALLIED?

YesNo

PRIMARY RESPONSE INCIDENT REPORTING

BASE RADIO ROOM

ASSET MANAGER / BASIN MANAGER

HEAD DRILLING SERVICES

SURFACE MANAGER & HEAD WELL SERVICES

NEAREST POLICE STATION

M.R.O. OFFICE

STATE FIRE DEPT.

R.C.M.T.

S.E.M.

SECURITY

ASSESSMENT OF SITUATION ON SITE

ON SITE MEETING

NOMINATE PROJECT CO-ORDINATOR

CIVIL , ADMN., POLICE, STATE FIRE, MEDICAL

TASK FORCE

ENGINEERING

RELIEF WELL TEAM

SUPPORT SERVICES

FIELD INTERVENTION TEAMWORK OUT THE CONTROL STRATEGY

MOBILIZE THE RESOURCES

BLOW OUT CONTROL & FIRE FIGHTING EQUIPMENT

POLLUTION CONTROL EQUIPMENT

O.N.G.C.

OUT SIDE

EXPERTS

ESTABLISH INFRASTRUCTURE-- COMMUNICATION

-- FIRST AID-- ON SITE CAMP

-- OFF SITE OFFICEEXECUTE CONTROL PLAN

LOGISTICS, COMMUNICATION, WORK SHOP, S.E.M., FIRE, MEDICAL, P&A,

F&A, M.M, P.R., LEGAL

SECONDARY RESPONSE

O.N.G.C.

OUT SIDE

O.N.G.C.

OUT SIDE

77

PPRROOJJEECCTT BBEENNEEFFIITTSS



PROJECT BENEFITS

7.1 PROJECT BENEFITS

The proposed development drilling of twelve (12) onshore wells drilling in the Nambar, East

Lakhibari, Khoraghat and Khoraghat Extension Mining lease areas in the Golaghat district

and Borholla Mining lease area in the Jorhat district of Assam will lead to following benefits:

The Project will enhance hydrocarbon production, the hydrocarbon gain is expected to be

30m3/day (NRDJ & NRDK wells), 30m3/day (ELDA well) and 90m3/day (KHDD,

KHDE & KHDF wells) in Golaghat District and 60 m3/day (BRDO & BRDN wells) in

Jorhat District, which will in-turn contribute to country’s economy by enhancing energy

security and reducing foreign exchange outgo.

The proposed project will result in the direct and indirect employment opportunities to the

unskilled/skilled local/regional people as well as increase in business opportunities.

The proposed project will benefit the region by way of creation and improvement of

infrastructure facilities like roads, drainage, bridges etc.

Assistance from ONGC as part of Corporate Social Responsibility (CSR) schemes in the

fields of education, health, infrastructure etc. for the benefit of local people and region.

7

88


MMAANNAAGGEEMMEENNTT

PPLLAANN



8 ENVIRONMENTAL

MANAGEMENT PLAN

8.1 INTRODUCTION

This Environmental Management Plan and Monitoring Framework is a site specific document

for the development drilling of hydrocarbons that has been developed to ensure that ONGC

can implement the project in an environmentally conscious manner and where all contractors,

understand the potential environmental risks arising out of the proposed project and take

appropriate actions to properly manage such risk.

This EMP will be an overview document that will guide environmental management of all

aspects of ONGC’s activities i.e. construction and operation of exploration/development

wells, GGS and Pipelines within the Block. This EMP will be backed up by more specific

Environmental Action Plans, Procedures and Bridging Documents with the progress of the

well site preparation, development drilling, well testing and site decommissioning activities.

8.2 PURPOSE AND OBJECTIVES OF THE ENVIRONMENTAL MANAGEMENT

PLAN (EMP)

An Environmental Management Plan (EMP) provides a delivery mechanism to address the

adverse environmental impact of a project during its execution, to enhance project benefits,

and to introduce standards of good practice to be adopted for all project works.

The primary objectives of the EMP are to:

Facilitate the implementation of mitigation measures for identified Adverse Impacts;

Define the responsibilities of the Project Proponents and Contractors in order to

effectively implement the Environmental Management Plan;

Define a Monitoring Mechanism and identify Monitoring Parameters in order to:

o Ensure the complete implementation of all Mitigation Measures;

o Ensure the effectiveness of the Mitigation Measure;

o Provide a mechanism for taking timely action in the face of Unanticipated

Environmental Situations;

Identify training requirements at various levels.

8.2.1 HSE Policy of Block Operator

The use of fossil fuel will depend not only on Technical, Economic and Political decisions but

increasingly on environmental considerations and its impact.

Block Operator will continue to conduct its activities in a professional and responsible

manner. The company, not only will comply with the laid down legislation requirements

8



but when found inadequate will promote creative measures and internal standards for the

protection of Health, Safety & Environment of the highest order for all who may directly

or indirectly be affected by any of the activities.

Personal Safety and Employee Health is our greatest responsibility, followed by the

protection of the Environment and Company Property. The company will continue to take

a proactive approach towards creating safe work environment for all employees and will

be concerned for promoting continued safety education and training for all employees,

assigning responsibility for all aspects of the program, continuously reviewing the

program to identify potential areas of improvement, and ensuring a thorough evaluation

of all incidents.

The company will continue to address the Environmental and Health impact of the

operations by reducing Waste, Emissions, discharges and by using energy efficiently.

The company will maintain awareness of HSE matters, so as to be proactive in providing

a value-added service to the Clients. This awareness is achieved through Education,

Communication and definition of the goals and standards appropriate to operation and

those undertaken on the Client’s behalf.

8.2.2 Organizational Structure and Responsibilities

This section provides an organizational structure for Environmental Management during

the proposed drilling project and defines the roles and responsibilities of the various role

players for the duration of the project.

A) Management Approach

The organizational roles and responsibilities are summarized below:

Block Operator: The overall responsibility for compliance with the Environmental

Management Plan rests with the Project Proponent.

Contractors: The Contractors (Civil, Drilling and Others) will carry out field activities as

part of the Development Drilling project. The contractors will be subject to certain

liabilities under the environmental laws of the country, and under their contract with

Block Operator.

A certain degree of redundancy is inevitable across all management levels, but this is in

order to ensure that compliance with the environmental management plan is

crosschecked.

Other essential features of the EMP are:

Block Operator will appoint a Mine Manager to oversee HSE compliance throughout

the duration of the Drilling Program. HSE Officer/ Safety Officer as per DGMS will

assist him in implementation and monitoring;

Block Operator will ensure that all contracts comply with the requirements given in

the Environmental Management Plan;



Block Operator will cooperate with regulatory agencies (such as the State Pollution

Control Board, CPCB, DGMS, OISD, MoEF) who may want to send their own teams

to monitor the activities during the Drilling Program.

B) Organizational Responsibilities

The salient features of the organisational responsibilities are described below:

(i) Primary Responsibilities:

The primary responsibilities for the environmental performance of the Project

Proponent & the Contractors will be assumed by their senior level officers during the

project period.

Block Operator’s Mine Manager will be responsible for the company’s compliance

with the EMP throughout the project.

The contractor will assume the main responsibility for all environmental matters

pertaining to their work.

Block Operator will coordinate with relevant Government Departments.

(ii) Field Management and Quality Control:

Conducting Drilling Activities in an environmentally sound manner will be the

responsibility of the Drilling Contractor/Company.

Block Operator’s Safety Officer (Drilling) will be responsible for the overall

environmental soundness of all field operations.

(iii) On-the-job Supervision and Monitoring:

Block Operator has a Safety Officer, who is responsible for ensuring compliance with

the EMP during the drilling operation. He is also responsible for communicating with

and training the Drilling Crews in all aspects of the EMP.

Block Operator has an HSE Coordinator who will be responsible for all

environmental issues and for the implementation of the environmental management

plan in the field.

If any Monitoring Team from Government Departments or from NGOs visit the field

during the Drilling Operation, Block Operator’s HSE Coordinator will be responsible

for coordinating their visits.

8.3 MITIGATION PLAN

The Mitigation Plan is the key component of any EMP. It lists all the potential impacts of the

project and their associated mitigation measures identified in the EIA. For each

Impact/Hazard, the following information is presented in the plan:

A comprehensive listing of Mitigation Measures

Actions Required

The mitigation plan for proposed development drillings is presented Table 8.1 (prior to

drilling phase) and Table 8.2 (during drilling phase).



Table 8.1: Mitigation Management Matrix (Prior to Drilling Phase)

Hazard & Effect(s) Proposed Mitigation Required Actions

Land Acquisition

Obtain necessary approvals

from State Government for

construction & operations.

Ensure that all necessary protocols are followed and

legal requirements implemented.

Ensure that appropriate legal requirements (Land

Acquisition Act) have been met with regard to land

occupancy, land ownership or usage rights, notice &

compensation, etc.

Establish and clearly document all land agreements

with owners, users and state authorities & mark out

site boundaries.

Acquiring necessary approvals from State government

in a timely manner.

Block Operator to initiate interaction with the concerned

officials in the State Government, prior to release of actual

location to identify necessary permits and the approval

mechanism.

Apply for approval for Land acquisition with proper maps

and prescribed fees.

Preliminary site survey to be carried out by block

operator’s civil works consultants to mark the road & site

requirement on ground.

Block Operator’s Team to meet the State Pollution

Control Board Authorities to apprise them of the plan and

to identify and apply for necessary permissions prior to

drilling phase.

Soil Erosion Minimize the extent of site clearance area, by

choosing best layout with respect to existing

topography.

Minimize removal of trees at site.

Collect topsoil during site preparation and stockpile

the same to be used to the extent possible for site

restoration later.

Detailed contour maps of the site to be prepared with big

trees marked on it to work out the best layout to minimize

cut & fill & avoid cutting of trees.

Plan to minimize tree cutting prior to site construction and

ensure implementation on ground during site construction

phase.

To provide retaining walls to arrest flow of cut earth to

nearby areas and to see that arrangement is in place for

collection.



Table 8.2: EMP - Mitigation Management Matrix (During Drilling Phase)


Waste and Effluent Management

Poor planning and execution might

pose a threat to environment.

Block Operator to identify different type of waste

anticipated during operations, work out estimated

quantities, lay down procedures for collection, handling,

treatment and disposal of each type of waste.

Implementation of Waste Management Plan (as given

in Table 8.3)

Waste Management Plan to be implemented during

operations.

Waste Management Plan to be implemented during

drilling and be made available for inspection at site to

all Regulatory Bodies.

Contamination of rain/storm water

runoff with rig wash water & waste

mud

Detailed drainage design will be developed as a part of

the site design. It will be ensured that mud and

associated drainage system is isolated from the rain/

storm water drainage system.

Block Operator in association with Civil Works

Consultants/ contractors to develop detailed drainage

system addressing concerns outlined here.

Install and maintain effective run-off controls,

including silt traps, straw barriers etc.

Pits must have adequate capacity to prevent flooding

during high rains (maintain free board) and should be

fully bounded.

Block Operator to work out required pit volumes

based on maximum case scenario including rainwater.

Wastewater & cuttings may contain

trace amounts of drill fluid and

residual chemicals.

All wastewater, which will be generated from washings

& spent mud will be contained in HDPE lined (300

GSM) pits and will be solar evaporated, which is

permissible as per GSR 546.

Site design will include adequately sized pits to

contain wastewater for solar evaporation.

Cuttings will be dried to maximum extent possible using

suitable equipment and will be contained in separate pits

Block Operator will use drier system to treat the

cuttings coming from the shakers to achieve fairly Dry




before final disposal as per direction from Regulatory

Authority.

Cuttings.

The water generated during drilling operation is likely to

have very high turbidity and salt contents. This water

will be treated in ETP and the treated water after

conforming to MoEF standards will be discharged to

Effluent Injection Well.

Mobile ETP part of the drilling rig will be used for

treatment and if any excess water, it will be sent to

permanent ETP attached with GGS (nearby ML areas)

Fuels, Lubricants and Chemicals

Management pose threat of major,

moderate & minor spills

Prepare a comprehensive Oil Spill Contingency Plan

(OSCP) to handle all major, moderate & minor spills.

Implementation of OSCP will be ensured.

Keeping all fuels, lubricants and chemicals in well-

designed storage facility with regular inventory

checking.

Checklist of all drums and containers located within

footprint of the storage area will be prepared.

Ensure that OSCP is implemented during operations. Training and awareness program to be developed

among all workers associated along with mock

exercises.

Contamination by way of

oil/lubricant spills and leaching

Used and unused chemicals will be stored in a lined &

bunded area.

The lined & bunded area for the diesel tank will have

extra space to contain used and unused lubricants in

drums.

Executing delivery of fuel to drilling site under strict

supervision and carrying out refueling operations in an

area with impervious flooring and surface drainage with

oil interceptor.

Keeping an inventory of all fueling and refueling

operations.

Impervious liners in place for fuel, lubricants storage

area. Fuel/Lubricant Containment & Generator area to

have drains with Oil Entrapment Provision




Use of suitable delivery trucks. Check all delivery trucks for suitability & ensure that

they meet safety requirements.

Effective bunds capable of containing 110% of the

volume of the largest container within and enclosing all

potentially contaminating materials. To be used for

fuel/lubricants storage area

Site design to incorporate bund requirement for the

fuel/lubricant storage area.

Major Spills

Non-contaminated and contaminated runoff will be kept

separate. Non-contaminated runoff will be routed to off-

site area. Potentially contaminated runoff will be treated.

Ensure separate runoff routes during site design.

Major Spills: OSCP could be in place and associated

equipment and tools should be available.

These spills will be handled and controlled with

special care and the soil contaminated with oil will be

sent to Bioremediation site.

All spills/leaks contained, reported and cleaned up

immediately.

Noise and Vibration

Noise and Vibration Checklist of all machineries with record of date of

procurement, installation and age.

Maintain data records.

Regular maintenance of all equipments. Maintenance Log Book for all machineries to be

prepared.

Implement good working practices to minimize noise. No machinery will be operated when not required.

Selection and use of low noise generating equipment

equipped with engineering controls viz. mufflers,




silencers etc

Setup effective noise barrier at the fence-line of the

site;

Wearing of ear protector when appropriate. Block Operator to distribute noise protection

equipment and ensure utilization by the work force.

Air Emissions

Air Emissions Operate all equipment within specified design

parameters.

Ensure proper Equipment maintenance.

Minimize emissions during well testing (flaring). Effective separation of Oil & Gas to be achieved and

the separated oil will be transported to nearest ONGC

installation and only dry clean gas to be flared.

Flaring will be undertaken in accordance with the Sl

No.72. B CPCB Guidelines for Discharge of Gaseous

Emissions for Oil & Gas Extraction Industry.

Duration of flaring will be minimized by careful

planning and High combustion efficiency; smokeless

flare/burner will be used.

Exhausts of engines on the drilling rig diesel generators

will be positioned at a sufficient height to ensure

dispersal of exhaust emissions; engines will not be left

running unnecessarily

Preventive maintenance of DG sets will be undertaken

as per manufacturers schedule to ensure compliance

with Sl No 94 GSR 371(E) dated 17.5.2002.

Watering of unpaved roads if required to control dust Ensure absence of stockpiles or open containers of




generation. dusty materials.

Covering of vehicles used for delivery of soil,

aggregates for construction is required.

All vehicles will used for transportation will be PUC

certified.

Solid Wastes

Wastes will include organic wastes,

scrap metal, waste oil & chemicals,

sacks, medical wastes, etc.

Ensure proper documentation of all wastes generated. Pre-operation inspections to ensure waste disposal

facilities are in place.

Litter and debris not to be discarded at site and to be

segregated at segregation pit on the well site.

A segregation pit to have waste types segregated into

separate drums at the well site.

Non-Toxic Biodegradable Waste to be buried during

operations and de-commissioning, ensuring that local

water resources are not contaminated in any way.

Block Operator to arrange for proper disposal and

waste recycling contractors.

Bulk supply of materials to be preferred for

minimization of packaging wastes. Unused materials to

be returned to Supplier.

Material such as scrap metal, waste oil will be disposed

of in a controlled manner through authorized waste

contractors.

Non-routine/ accidental events

Non –routine events Draw up Emergency Response Plan (ERP), Well Block Operator to monitor strict compliance with the




Control Plan, OSCP plan and keep them updated.

Maintain state of readiness for quick response including

plan awareness, training and regular mock exercises.

provisions of OSCP and ERP & Well Control Plan.

Records of interaction between the management and

the work force. Records of training and drills.

Ensure all available offset data is examined for proper

design parameters and ERP (Emergency response

plan) to be in place

Loss of well control Proper well design, which will ensure that the

hydrostatic weight of mud will overcome formation

pressure.

Well monitoring equipment to detect influx from

reservoir. Pressure detection service provided through

Mud-logging.

Proper drilling program design to ensure selection of

properly rated BOP equipment.

Blowout preventers tested on installation and

routinely.

Ensure that the Block Operator’s supervision team &

Rig Contractor’s relevant operating personnel are

trained to handle well control situations and hold

relevant Well Control Training Certificates.

To ensure key personnel to have International Well

Control Forum (IWCF) certificates.

Well kicks, blow out etc.

To detect well kicks immediately to prevent blowouts.

Ensure advanced detection system is in place and BOP

equipment is well maintained.

Advance instrumentation system and Mud Logging

unit should be available.

Gas Detector or Explosion meter will be provided at

Primary Shale Shaker and connected to audible or

visual alarm near the Driller Stand.

Socio-Economic Impacts

Socio-Economic Impacts Ensure no water (surface or ground) contamination Implement proposed Waste Management Plan and

undertake water quality monitoring before, during and




occurs from drilling operations.

Undertake social welfare projects for the local

communities through CSR strategy.

Few unskilled manual labours may be engaged

temporarily from local communities.

after the operations.

Implement social welfare schemes as per Company’s

CSR policy.



8.4 ENVIRONMENTAL TRAINING

HSE training will help to ensure that the requirements of the EIA and EMP are clearly

understood and followed by all project personnel throughout the project period. The primary

responsibility for providing training to all project personnel will be that of ONGC.

ONGC will train the site staff, the drilling contractor, and other staff engaged by Block

Operator for the project. Training will cover all staff levels, ranging from the management

and supervisory to the skilled and unskilled categories. The scope of the training will cover

the requirements of the EIA and the EMP, with special emphasis on sensitizing the project

staff to environmental, social, ethnic, and tribal context of the area.

The Drilling In-charge will conduct Pit Level Meeting, Job Safety Analysis and Tool Box

Meeting for the Block Operator Staff and the Contractor Staff to better appreciate

environmental risks and their mitigation measures. This will be undertaken after conducting

audits on the operations. SOP and provisions of the Mines Act and relevant OISD standards

should be discussed with Rig Operator.

8.5 WASTE MANAGEMENT PLAN

For the proposed drilling, it is expected that the drill cuttings will be free from oil and may

not be rendered as hazardous, provided it is out of the purview of concentration criteria laid

down under the Rules.

The sludge from the proposed drilling operations may be rendered as free from oil by

providing suitable pre-treatment measures. However, as per the Rules, any chemical sludge

generated from wastewater treatment is considered as hazardous. Therefore, the chemical

sludge from the wastewater treatment at the proposed Developmental Drilling can be rendered

as hazardous.

The Drilling Mud and Other Drilling Wastes also considered as hazardous. However, based

on sampling and analysis carried out through a recognized laboratory after the end of the

drilling phase, if it is proved that the drilling mud and other drilling wastes do not contain any

of the constituents mentioned in HWM Rules to the extent of concentration limits specified

therein, the wastes may not be treated as hazardous.

Block Operator would require prior authorization from the State Pollution Control Board for

treatment, storage, transportation and disposal of any hazardous waste generated at site during

drilling operations. Management of drill cuttings, waste drilling mud, waste oil and domestic

waste will be made in accordance with S No. 72 C.1.a Schedule I Standards for Emission or

Discharge of Environmental Pollutants from Oil Drilling and Gas Extraction Industry of

CPCB as modified in 2005.

To facilitate field level implementation, a Waste Management Plan is proposed, which will be

subject to fine tuning before the start of the operations. This Waste Management plan is

presented below in Table 8.3.



Table 8.3: Waste Management Plan

Category Waste Type Proposed Action

Who is

Responsible for

action?

What needs to be

Reported? Monitoring

Drilling

Wastes

Drill Cuttings To be stored in 300 GSM HDPE lined pits on the well

site. The pits will be bunded and kept covered with

Tarpaulin sheets during monsoons.

At the close of operations, if leachate analysis performed

on properly washed and reasonably dried drill cuttings

show that it is non-hazardous in nature, then it can be

disposed of as inert material either into a cuttings pit

onsite or offsite or taken for beneficial use in construction

of roads or spreading on land in the local area or land

filling. For disposal on site, the waste pit after it is filled

up will be covered with impervious liner over which a

thick layer of native top soil with proper top slope will be

provided.

If found hazardous, disposal can be done onsite or offsite

as per the approval of the State Pollution Control Board

or to dispose it in some existing secured landfill operating

in the region.

HSE Officer

cum

coordinator

Verify that volume of pit is

adequate for storage of

cuttings from the drilling

site.

Leachate analysis to be

done on completion of the

well from a recognized

Lab.

ONGC

Un-used

Drilling Mud

As per GSR 546, the un-used drilling mud will be stored

in 300 GSM HDPE lined bunded pit on site and solar

evaporated.

HSE Officer

cum

coordinator

Check integrity of the

HDPE lined pit.

ONGC

Drilling & All wastewater, which will be generated from washings & HSE Officer Check integrity of the ONGC




Who is

Responsible for

action?

What needs to be


Wash

Wastewater

spent mud will be contained in HDPE lined (300 GSM)

pits and will be solar evaporated, which is permissible as

per GSR 546.

cum

coordinator

HDPE lined pit. Volume

(cum) of wash wastewater

generated.

Chemical

Sludge

(generated as a

result of

wastewater

treatment)

The treatment of the sludge so generated can be for pH

correction, if any, followed by dewatering either in

centrifuge and or solar evaporation. The treatment is to be

ensured in a pit properly lined with impervious HDPE

liner of 1.0 mm.

Disposal is dependent on establishing non-hazardous or

hazardous nature after the end of operations.

HSE Officer

cum

coordinator

Check integrity of the

HDPE lined pit. Volume

(cum) of the sludge

generated.

Testing for stipulated

standards from recognized

Labs before deciding final

disposal.

ONGC

Oily Waste Used Oil Oil changing activity is allowed only at the rig site. Oil to

be collected in designated containers at the Rig site.

Ensure that the used oil drums are safely transported to

the approved recycling contractor.

HSE Officer

cum

coordinator

Collection and storage of

oil. Used oil drums safely

transported and sent to

approved recyclers.

ONGC

Domestic

Waste

Sewage

(Black Water)

Domestic wastewater (sewage and sullage) will be

generated from each drilling site. The treatment proposed

for the domestic water includes allowing domestic

wastewater to pass into a septic tank to be provided at a

drilling site. The septic tank will be constructed as per the

Bureau of Indian Standard IS: 2470 (Part-1): 1985.

HSE Officer

cum

coordinator

Dimensions of pits,

Integrity & maintenance of

the pits, level of sewage in

the pits.

ONGC




Who is

Responsible for

action?

What needs to be


All Sewage to be channelized into septic tanks and soak

pits. The disposal of the overflow from the septic tank

will be done into a soak pit provided at the drilling site.

The secondary treatment (soak pit) can be constructed as

per the Bureau of Indian Standard IS: 2470 (Part-2):

1985.

Wastewater

from Kitchen

and Laundry

(Grey Water)

All gray water to be channelized into soak pits. Excess

waste water will be sprinkled on the project access road.

HSE Officer

cum

coordinator

Dimensions of pits,

Integrity & maintenance of

the pits, Level of gray

water in the Pits. Check

availability of grease

collection pit and frequent

collection of grease,

regular checking of

wastewater level in the pit.

ONGC

Food Waste To be properly segregated (no plastics, metal, glass in it)

and brought to the segregation pit. Dig two small humus

pits (each of 2m x 2m x 1.5 m) within the camp site area

away from common use by rig crewmembers. The humus

pits are to be covered with soil on daily basis to avoid any

odour nuisance and flies or insects nuisance due to

composting

HSE Officer

cum

coordinator

Construction of pits, daily

disposal of organic waste

and covering it with soil

ONGC

Combustible

Waste (Paper.

To be properly segregated (no plastics, metal, glass in it)

and brought to the segregation pit. Sent to recycling

HSE Officer

cum

Ensure daily bringing of

the waste to the pit.




Who is

Responsible for

action?

What needs to be


Rags, Packing

material)

contractor. coordinator Periodic sending of waste

to Recycling Contractor.

ONGC

Recyclable

Waste

Tin packs,

plastic and

glass bottles

and other

metallic

materials

To be properly segregated and temporarily stored in

segregation pit at well site. Deliver to Approved

Recycling Contractor.

HSE Officer

cum

coordinator

Ensure daily collection of

waste to the pit.

Segregation and storing of

waste at the site.

Sending of waste to

Recycling Contractor.

Bio-Medical

Waste

Medical waste

(waste

generated from

First Aid

Centre)

To ensure the availability of specified boxes, use of

syringe cutters. Waste to be properly separated and stored

temporarily at site separately from other wastes. Medical

waste to be transported to the hospital capable of handling

waste.

Medical

Doctor

Segregation and

Transportation of waste as

per Bio-Medical Waste

(Management & Handling)

Rules, 2011.

ONGC



8.6 RESTORATION AND REHABILITATION

The Restoration and Rehabilitation plan will identify all the activities which would be

performed during the restoration of a particular site in case the well is not

economically/commercially viable and no further use of that particular well bore is envisaged

or even during well suspension.

a. Well Abandonment

After well testing and evaluation, a decision on whether to abandon or develop the well will

be taken. If no indications of a commercial quantity of oil are encountered either before or

after testing, the well will be declared dry, accordingly plugged and abandoned, and the site

restored in line with local regulations and good industry practice.

The abandon drill sites will be restore and rehabilitate as per the below Standard Operating

Procedure (SOP). Following SOP are based on the guidelines of DGMS, MoEF, SPCB,

CPCB tec.



b. Well Suspension

After well testing and evaluation, if it is decided that the block is to be developed, the well

site and the approach road will be maintained. The site will not be restored to its original

condition until a decision is taken on the environmental assessment of the field development.

Until then, the fencing will be left intact and the site sealed and protected. The road will be

maintained but barriers installed at suitable locations will control access to it. Block Operator

will provide a yearly environmental monitoring report for this period to the Regulatory

Bodies for their information. The Report will consist of records of any activity, environmental

issues, and the activities planned concerning the Block.

8.7 OCCUPATIONAL HEALTH AND SAFETY MANAGEMENT PLAN

The Occupation Health & Safety Management Plan (OHSMP) has been formulated to address

the occupational health and safety related impacts that may arise from proposed project

activities viz. Development drilling and testing operation of construction

machinery/equipments, storage and handling of fuel and chemicals, operation of drilling rig

and associated equipment, decommissioning/site closure. Following measures will be adopted

for safe operations of the Drilling site:

All machines to be used in the construction will conform to the relevant Indian Standards

(IS) codes, will be kept in good working order, will be regularly inspected and properly

maintained as per IS provisions and to the satisfaction of the site Engineer.

Contractor workers involved in the handling of construction materials viz. borrow

material, cement etc. will be provided with proper PPEs viz. safety boots, nose masks etc.

Provision of ear plugs, ear muffs etc. and rotation of workers operating near high noise

generating areas.

Hazardous and risky areas, installations, materials, safety measures, emergency exits, etc.

shall be appropriately marked.

All chemicals and hazardous materials storage container will be properly labeled and

marked according to national and internationally recognized requirements and standards.



Materials Safety Data Sheets (MSDS) or equivalent data/information in an easily

understood language must be readily available to exposed workers and first-aid personnel.

The workplace must be equipped with fire detectors, alarm systems and fire-fighting

equipments. Equipments shall be periodically inspected and maintained to keep good

working condition.

Health problems of the workers will be taken care of by providing basic health care

facilities through health centre in the vicinity.

The sewage system for the DSA/Drill site must be properly designed, built and operated

so that no health hazard occurs. Adequate sanitation facilities will be provided onsite for

the operational workforce both during construction and operational phase of the project.

Garbage bins will be provided in the DSA and regularly emptied and the garbage

disposed off in a hygienic manner.

Training programs will be organized for the operational workforce regarding proper usage

of PPEs, handling and storage of fuels and chemicals etc.

Records will be maintained for all the above activities.

8.8 CAPITAL AND RECURRING COST FOR POLLUTION CONTROL MEASURES

The existing facilities at Nambar ML area, Khoraghat and Khoraghat Ext. ML area, East

Lakhibari ML area and Borholla ML area i.e. ETP, sewerage system, septic tanks, storage

tanks etc will also be utilized for proposed project activities.

In view of this, the capital and recurring cost towards pollution control measures for

proposed project is more of related to monitoring and maintenance of

machineries/equipments.

The capital and recurring cost for each Drilling Location is given in Table 8.4. The

capital cost is about INR 17, 62, 000 and the recurring cost is INR 28, 31, 000 for

Pollution Control Measures.

Table 8.4: Capital and Recurring Cost for Pollution Control Measures

S. No. Pollution Control Measures Total

Capital Cost

Recurring

Cost

1 Wastewater and effluent Management

Septic Tank

Water Quality Monitoring

37,000

15,000

40,000

2 Fuel, Lubricant and Chemical Management 15,00,000 65,000

3 Noise and Vibration Mitigation

Acoustic Enclosure and Personal Protective

Equipments

Noise Monitoring

Maintenance cost of equipments

1,75,000

35,000

58,000

4 Solid Waste Management 50,000 -

5 Air emission mitigation

Maintenance of D.G. sets

Air monitoring -

21,50,000

1,25,000



S. No. Pollution Control Measures Total

Capital Cost

Recurring

Cost

6 Soil Quality - 43,000

7 Training to Staff - 1,25,000

8 General Awareness in Local Public - 1,75,000

Total 17,62,000 28,31,000

The costs are calculated based on the current charges of an accredited laboratory/consultant/

contractor to perform the above said work.

99

SSUUMMMMAARRYY AANNDD

CCOONNCCLLUUSSIIOONN



SUMMARY AND

CONCLUSION

9.1 SUMMARY AND CONCLUSION

ONGC had proposed On-shore Developmental Drilling of Eight (08) wells in Nambar, East

Lakhibari, Khoraghat and Khoraghat Extension Mining lease areas in the Golaghat district

and Four (04) wells in Borholla Mining lease area in the Jorhat district of Assam State.

The environment status of the drill site and the Borholla ML area of 32.116 sq. km. and

Nambar, East Lakhibari, Khoraghat and Khoraghat Extension ML areas of 120.5 sq. km., is

delineated with respect to air, noise, soil, water, biological and socio-economic environment.

The different project activities are identified and evaluated on the basis of primary and

secondary data collection through field investigations, environment monitoring and from

secondary sources viz. maps, reports, scientific literatures etc. A summary of the identified

impacts are given in the following paragraphs.

In the pre drilling phase, different construction activities (land clearance, earth work, site

grading etc.), movement of vehicles (for transportation of raw materials), operation of

generators and other associated project activities will have impact on air, water, soil, flora,

fauna and surrounding communities. On the other hand, during operation phase, operation of

generators, gas compressors etc; flaring, discharge of wastewater and movement of vehicles

will affect the air, noise, soil, ecology and social environment.

With respect to occupational health, impacts are anticipated on the health of the employees

during operation phase. Personnel working near the noise generating machines, DG sets, flare

and hazardous waste storage area are more susceptible to health hazards.

However, all these impacts can be overcome with the proposed mitigation measures proposed

in Chapter 4 and Chapter 8. Overall; this project will bring economic benefits, increase energy

security of the country and generate employment opportunities.

9

1100

DDIISSCCLLOOSSUURREE OOFF

CCOONNSSUULLTTAANNTTSS

EENNGGAAGGEEDD



DISCLOSURE OF

CONSULTANTS ENGAGED

10.1 INTRODUCTION

Asian Consulting Engineers Pvt. Ltd. (ACE) is an independent consulting company in the

field of Water and Environment Engineering with its headquarters located in New Delhi,

India. ACE provides Consulting Services and Sustainable Solutions for Infrastructure Projects

(Roads, Railways, Ports, Hydropower, Water Resources and Other Urban Infrastructural Plan

Outs), Industrial Projects (Refineries, Petrochemicals, Gas Pipelines, Offshore and Onshore

Oil & Gas Exploration, Fertilizers, Steel Plants, Power Plants, Textiles, Hotels, Distilleries

and Tanneries) And Social Development Projects.

ACE is committed to provide consultancy services of International Quality at local costs to

suit its client’s requirements. ACE believes that the key to success is the ability to work

effectively with clients to understand, define, and resolve their environmental concerns. ACE

offers technical talent, specialized expertise, physical resources, and requisite facilities that

are important in responding to water and environmental issues, the world faces today. The

quality of work and timely completion of project are of paramount importance in each

assignment that ACE undertakes.

We, at ACE, know what makes for a successful project. Clients turn to ACE because

We understand the issue at hand

Have the required experience and expertise to develop unique solutions

Complete work on time and within budget

Work towards client satisfaction

ACE offers this combination of quality and performance through its professionals, managers

and Support Personnel. Our People are equipped with state-of-the-art technologies and they

are motivated to implement the project to the satisfaction of the Client.

10.2 QUALITY OF SERVICES

ACE is committed to providing a high quality consultancy service. As a recognition of same,

ACE has been awarded ISO 9001: 2008 certified (Certificate no: 22340/10/S) by RINA, to

provide consultancy services for Water Supply, Waste Water Treatment, Municipal Solid

Waste Management, Environment And Social Impact Assessment, Environment Impact And

Audit, Remote Sensing And Geographical Information Systems. In addition to this, ACE is

also accredited with Quality Council of India (QCI) (Certificate No.: NABET/EIA/1013/012)

for preparation of EIA of Onshore and Offshore Oil and Gas Exploration and Development

and Transportation of Oil and Gas through Pipelines (Category A).

10.3 AREA OF SPECIALIZATION

Water Resources Engineering

Water Supply

Wastewater Management

10



Urban Environment Improvement

Environmental Management

Social Development

GIS and Remote Sensing

10.4 RESOURCES

Panel of Experts

ACE has Experts in the following specialized areas:

Water supply engineering

Water resources engineering

Wastewater engineering

Solid waste management

Public Health and Sanitation

Environmental Management

Forestry and Wildlife

Environmental modeling

Fisheries

Aquaculture

Social development

Infrastructural Resources

Following facilities are available with ACE:

Air quality models

Noise quality models

Water quality models

Water distribution analysis software

Sewer network analysis software

Software Availability

AERMOD

CALINE4

Erdas Imagine

Arc GIS

AutoCAD

Map Info

AANNNNEEXXUURREE -- II

CCOOPPYY OOFF AAPPPPRROOVVEEDD TTOORR,, FFOORRMM--11 AANNDD PPFFRR

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FORM 1

Developmental Drilling at Golaghat District by ONGC Ltd

I Basic Information:

Sl Item Detail

1. Name of the project/s Development drilling of 8 wells in

Nambar , East Lakhibari and Khoraghat

Oil and Gas Field in Golaghat District,

Assam

2. S. No in the Schedule 1(b)

3. Proposed Capacity/ area/length/ tonnage to be

handled/ command area/ lease area/ number of wells

to be drilled

1. Nambar ML Area 26 Sq km (Approx)

2. East Lakhibari ML Area 8.5 Sq km

(Approx)

3. Khoraghat ML Area 3 Sq km

(Approx)

4. Khoraghat Extension ML Area 83 Sq

km (Approx)

4. New/Expansion/ Modernization Expansion

5. Existing capacity/Area etc. NA

6. Category of Project i.e. ‘A’ or ‘B’ A

7. Does it attract the general condition? If yes, please

specify.

No

8. Does it attract the specific condition? If yes, please

specify.

No

9. Location Golaghat District

Plot/Survey/Khasra No

Village

Tehsil

District Golaghat

State Assam

10. Nearest railway station/airport along with distance in

kms.

Furkating Railway station / Jorhat

airport

11. Nearest Town, city, District Headquarters along with

distance in kms.

Golaghat Town

12. Village Panchayats, Zilla Parishad, Municipal

Corporation, Local body (Complete postal addresses

with telephone nos. to be given

Chief Executive Officer

Golaghat Zila Parishad

Golaghat, Assam

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Sl Item Detail

13. Name of the applicant Sub-Surface Manager, Assam Asset

14. Registered Address ONGC Ltd, 124 Indira Chowk Connaught

Place, New Delhi 110001

15. Address for correspondence

Name B.K.Baruah

Designation Asset Manager

Address ONGC Nazira, Sivasagar

Pin Code 785685

E-mail [email protected]

Telephone No. 03772-252300

Fax No 03772-252243

16. Details of Alternative Sites Examined, if any location of

these sites should be shown on topo sheet.

No

17. Interlinked Project No

18. Whether separate application for interlinked project

has been submitted?

N/A

19. If yes, date of submission N/A

20. If no, reason N/A

21. Whether the proposal involves approval/ clearance

under: if yes, details of same and their status to be

given.

(a) The Forest(Conservation) Act, 1980

(b) The Wildlife (Protection) Act,1972

(c) The C.R.Z Notification

Yes

The Forest (conservation) Act. 1980

The Wildlife (protection) Act, 1972

Approval/ Clearance to be obtained

22. Whether there is any Government Order/Policy

relevant/relating to the site

No

23. Forest land involved Yes

24. Whether there is any litigation pending against the

project and/or land in which the project is proposed to

set up?

(a) Name of the Court

(b) Case No

(c) Orders/ directions of the Court, if any and its

relevance with the project

N/A

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II Activity

1. Construction, operation or decommissioning of the Project involving actions, which

will cause physical changes in the locality (topography, land use, changes in water

bodies, etc.)

S.

No.

Information/Checklist confirmation Yes/No Details thereof (with approximate

quantities / rates, wherever possible)

with source of information data

1.1 Permanent or temporary change in land use, land

cover or topography including increase in

intensity of land use (with respect to local land

use plan)

Yes There will be a permanent change in

land use. However land will be restored

after drilling.

1.2 Clearance of existing land, vegetation and

buildings?

Yes Approximately 2 Ha land will have to be

cleared for each drilling locations and its

associated activities.

1.3 Creation of new land uses? Yes Same as Sl. No. 1.1 above

1.4 Pre-construction investigations e.g. bore houses,

soil testing?

No Hard field area. Normally soil testing

not essential for shallow / temporary

foundation for deployment of rig.

1.5 Construction works? Yes Construction of plinth area, foundation

for rig & its accessories, temporary

sheds, cellar pit and cutting retainer pits

as per standard lay-out drawing of the

drilling rig.

1.6 Demolition works? No

1.7 Temporary sites used for construction works or

housing of construction workers?

Yes Construction workers will stay in

temporary camps.

1.8 Above ground buildings, structures or earthworks

including linear structures, cut and fill or

excavations

Yes Earth filling is required to prepare

plinth.

1.9 Underground works including mining or

tunneling?

Yes The well bore hole will be drilled up to a

maximum depth of 3500m each.

1.10 Reclamation works? No

1.11 Dredging? No

1.12 Offshore structures? No

1.13 Production and manufacturing processes? Yes Oil Gas produced will be processed in

existing GGS Production testing of each

well will require at least about15 days

1.14 Facilities for storage of goods or materials? Yes Mechanical and drilling spares and

drilling chemicals in temporary sheds.

1.15 Facilities for treatment or disposal of solid waste Yes Solid waste / drilled rock cuttings will be

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or liquid effluents? confined within the waste pit.

1.16 Facilities for long term housing of operational

workers?

No Rig workers are operating on 14 days

on/off pattern from their respective

hometowns.

1.17 New road, rail or sea traffic during construction or

operation?

Yes Approach roads will have to be

constructed for al the drilling locations

for movement of men and materials to

the sites.

1.18 New road, rail, air waterborne or other transport

infrastructure including new or altered routes and

stations, ports, airports etc?

No

1.19 Closure or diversion of existing transport routes or

infrastructure leading to changes in traffic

movements?

No Partial closure of existing routes may be

required for very short periods on

account of improvement of road

condition. However, it will not lead to

any major change of the existing route

or traffic system.

1.20 New or diverted transmission lines or pipelines? No

1.21 Impoundment, damming, culverting, realignment

or other changes to the hydrology of

watercourses or aquifers?

No

1.22 Stream crossings? Yes Stream crossing if any, will be done by

building suitable culverts or bailey

bridge.

1.23 Abstraction or transfers of water form ground or

surface waters?

Yes Surface water / Bore wells as per

requirement/availability.

1.24 Changes in water bodies or the land surface

affecting drainage or run-off?

No

1.25 Transport of personnel or materials for

construction, operation or decommissioning?

Yes Rig personal operate from the drill site

accommodation (bunk houses)

1.26 Long-term dismantling or decommissioning or

restoration works?

No

1.27 Ongoing activity during decommissioning which

could have an impact on the environment?

No

1.28 Influx of people to an area in either temporarily or

permanently?

Yes Temporary. Movement of Field

personnel during drilling operations.

1.29 Introduction of alien species? No

1.30 Loss of native species or genetic diversity? No

1.31 Any other actions? Nil

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2. Use of Natural resources for construction or operation of the Project (such as land,

water, materials or energy, especially any resources which are non-renewable or in short

supply):

S. No. Information / checklist confirmation Yes / No Details thereof (with approximate

quantities /rates, wherever possible)


2.1 Land especially undeveloped or agricultural land

(ha)

yes Nearly 2.2 Ha of land for each drilling

location will be required.

2.2 Water (expected source & competing users)

unit: KLD

Yes 20-25 m3 / day for Drilling

2.3 Minerals (MT) Nil

2.4 Construction material – stone, aggregates, and /

soil (expected source – MT)

Yes Sand / Stone / Cement 100 Tonnes from

nearby dealers

2.5 Forests and timber (source – MT) No

2.6 Energy including electricity and fuels (source,

competing users) Unit: fuel (MT), energy (MW)

Yes 6 KL./day (Diesel for running captive

Gensets) - Drilling rigs

2.7 Any other natural resources (use appropriate

standard units)

No

3. Use, storage, transport, handling or production of substances or materials, which

could be harmful to human health or the environment or raise concerns about actual

or perceived risks to human health.

S. No. Information/Checklist confirmation Yes / No Details thereof (with approximate

quantities/rates, wherever possible)


3.1 Use of substances or materials, which are

hazardous (as per MSIHC rules) to human health

or the environment (flora, fauna, and water

supplies)

No

3.2 Changes in occurrence of disease or affect

disease vectors (e.g. insect or water borne

diseases)

No

3.3 Affect the welfare of people e.g. by changing

living conditions?

No

3.4 Vulnerable groups of people who could be

affected by the project e.g. hospital patients,

children, the elderly etc.,

No

3.5 Any other causes Nil

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4. Production of solid wastes during construction or operation or decommissioning

(MT/month)

S. No. Information/Checklist confirmation Yes/

No

Details thereof (with approximate

quantities/rates, wherever possible) with source

of information data

4.1 Spoil, overburden or mine wastes Yes Drilled cuttings generated will be about 212 m3

during the drilling over a period of 40-45 days

4.2 Municipal waste (domestic and or

commercial wastes)

No Septic tank will be provided for toilets in the drill

site (Sewage about 10 m3/day

4.3 Hazardous wastes (as per Hazardous Waste

Management Rules)

Yes 1. Spent oil

2. Waste Drilling mud

4.4 Other industrial process wastes Nil

4.5 Surplus product Nil

4.6 Sewage sludge or other sludge from effluent

treatment

Yes Oily sludge will be collected and disposed by

bioremediation

4.7 Construction or demolition wastes Will be disposed of for in surface hardening within

drill site area.

4.8 Redundant machinery or equipment Nil

4.9 Contaminated soils or other materials Nil Will be confined in impermeable waste pit within

the drill site area.

4.10 Agricultural wastes Nil

4.11 Other solid wastes Nil

5. Release of pollutants or any hazardous, toxic or noxious substances to air (Kg/hr)


No



of information data

5.1 Emissions from combustion of fossil fuels

from stationary or mobile sources

Yes Emissions from Captive Gensets (Rating: 6 x 750

KW) Only 3 units will be normally operated for

drilling rig.

5.2 Emissions from production processes

Yes If the well is hydrocarbon bearing during

production testing flaring of well fluids for a short

period of time.

5.3 Emissions from materials handling including

storage or transport

No

5.4 Emissions from construction activities

including plant and equipment

Nil

5.5 Dust or odors from handling of materials

including construction materials, sewage and

waste

Nil

5.6 Emissions from incineration of waste Nil

5.7 Emissions from burning of waste in open air

(e.g. slash materials, construction debris)

Nil

5.8 Emissions from any other sources Nil

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6. Generation of Noise and Vibration, and Emissions of Light and Heat:

S. No. Information/Checklist confirmation

Yes/No



with source of information data with

source of information data

6.1 From operation of equipment e.g. engines,

ventilation plant, crushers

Yes Within 75 dB

Noise levels within permissible limits

(Personal Protective Equipment will be

provided if required)

6.2 From industrial or similar processes Yes Within 75 dB

6.3 From construction or demolition Nil

6.4 From blasting or piling Nil

6.5 From construction or operational traffic Nil

6.6 From lighting or cooling systems Nil

6.7 From any other sources Nil

7. Risks of contamination of land or water from releases of pollutants into the ground or

into sewers, surface waters, groundwater, coastal waters or the sea:

S. No. Information/Checklist confirmation Yes/No Details thereof (with approximate



7.1 From handling, storage, use or spillage of

hazardous materials

No All effluents will be confined within

impermeable waste pits

7.2 From discharge of sewage or other effluents to

water or the land (expected mode and place of

discharge)

No -do-

7.3 By deposition of pollutants emitted to air into the

land or into water

No

7.4 From any other sources No

7.5 Is there a risk of long term build up of pollutants

in the environment from these sources?

No Development drilling is a temporary

activity lasting 2 to 3 months.

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8. Risk of accidents during construction or operation of the Project, which could affect

human health or the environment

S. No. Information/Checklist confirmation Yes/No




8.1 From explosions, spillages, fires etc from storage,

handling, use or production of hazardous

substances

Nil

8.2 From any other causes Yes Development drilling has the potential

risk of blow outs which will be handled as

per existing contingency plan.

8.3 Could the project be affected by natural disasters

causing environmental damage (e.g. floods,

earthquakes, landslides, cloudburst etc)?

Yes

9. Factors which should be considered (such as consequential development) which could

lead to environmental effects or the potential for cumulative impacts with other existing or

planned activities in the locality





9.1 Lead to development of supporting facilities,

ancillary development or development stimulated

by the project which could have impact on the

environment e.g.:

• Supporting infrastructure (roads, power supply,

waste or waste water treatment, etc.)

• housing development

• extractive industries

• supply industries

• other

Yes

If the Development drilling is successful

supporting infrastructure road, power

supply will be developed.

9.2 Lead to after-use of the site, which could have an

impact on the environment

No

9.3 Set a precedent for later developments Nil

9.4 Have cumulative effects due to proximity to other

existing or planned projects with similar effects

Nil No industries is nearby

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III. Environmental Sensitivity:

S. No.

Areas

Name/

Identity

Aerial distance (within 15 km.) Proposed

project location boundary

1 Areas protected under international conventions,

national or local legislation for their ecological,

landscape, cultural or other related value

None

2 Areas which are important or sensitive for

ecological reasons -Wetlands, watercourses or

other water bodies, coastal zone, biospheres,

mountains, forests

None

3 Areas used by protected, important or sensitive

species of flora or fauna for breeding, nesting,

foraging, resting, over wintering, migration

Nil

4 Inland, coastal, marine or underground waters Nil

5 State, National boundaries No

6 Routes or facilities used by the public for access

to recreation or other tourist, pilgrim areas

None

7 Defence installations Nil

8 Densely populated or built-up area No

9 Areas occupied by sensitive man-made land uses

(hospitals, schools, places of worship, community

facilities)

No

10 Areas containing important, high quality or scarce

resources (ground water resources, surface

resources, forestry, agriculture, fisheries, tourism,

minerals)

Nil

11 Areas already subjected to pollution or

environmental damage. (those where existing

legal environmental standards are exceeded)

N/A

12 Areas susceptible to natural hazard which could

cause the project to present environmental

problems (earthquakes, subsidence, landslides,

erosion, flooding or extreme or adverse climatic

conditions)

Nil

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IV Proposed Terms of Reference for EIA studies

1. Project techno-economic feasibility

2. Justification for locations considered for development drilling

3. Baseline studies for Air / water quality in the proposed development drilling

locations.

4. Site specific data collection for air / water quality within the vicinity of the drill site

5. Socio-economic impact of development drilling activity.

6. Identification of environmental impacts and mitigation measures

7. Environment management plan for the proposed drilling.

I hereby give undertaking that the data and information given in the application and enclosures

are true to the best of my knowledge and belief and I am aware that if any part of the data and

information submitted is found to be misleading at any stage the project will be rejected and

clearance give , if any to the project will be revoked at our risk and cost

Date:

Place:

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Prefeasibility Report

Development Drilling for 8 wells in Golaghat District by ONGC Ltd

Introduction

ONGC owns and operates in 3 main oil fields (ML areas) viz., Nambar, Lakhibari & Khoraghat

located in Golaghat district of Assam state. Though these oil fields have been established, they

need to be developed through drilling at various locations.

The Nambar ML area covers 26 Sq. Km of South Assam Shelf Block in South Namabar reserve

forest area of Golaghat district, Assam. For development of Nambar oil field 4 drilling locations

are proposed to be drilled in the said ML area. Two locations NRDJ and NRDK have already been

released by ONGC. The East Lakhibari ML area covers 8.5 Sq. Km of South Assam Shelf Block of

Golaghat district, Assam. For development of this field, 1 developmental drilling location

namely ELDA is required to be drilled. The Khoraghat ML and Khoraghat Extension ML area

covers 3 & 83 Sq. Km respectively of South Assam Shelf Block in Khoraghat area of Golaghat

district, Assam. For the development of these fields, 3 developmental wells are proposed to be

drilled in the area.

The proposed drilling activities will lead to enhanced production of hydrocarbons which will

cater to the growing demand of oil and gas in the country.

1.1 Description of Area

ML Block Area (Km2) Wells Latitude Longitude Depth

Nambar 26

NRDJ 26o 2' 51.233” 93

o 53' 09.576 2009

NRDK 260 03’40.051” 93

o 54’ 18.433 2129

2 unnamed - - -

East Lakhibari 8.5 ELDA 26o22'02.917” 94

o02'45.670 1980

Khoraghat 3 3 unnamed - - -

Khoraghat Extension 83

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1.2 Proposed Project

Nambar field, discovered in 1999, is a multi-reservoir field situated south-west of Khoraghat in

South Assam Shelf. The field has five pay sands (named from top: N-10, N-20, N-30, N-40 and N-

50) which belong to Lower Bokabil Formation of Miocene age. Nambar, an important

hydrocarbon-producing field of South Assam shelf was discovered in the year 1999 and came

into commercial production since March, 1999. Oil was struck at the first well Khoraghat#11

(later renamed as Nambar#1(NR-01) drilled on the structure. Free gas was tested only in 1 well

(NR-02). Nambar Field is characterized by the presence of multi-layered hydrocarbon reservoirs

belonging to Lower Bokabil Formation. For development of the field 2 Development locations

are currently available which namely NRDJ & NRDK. In addition to that 2 more locations are

also proposed to be drilled.

The East Lakhibari ML area covers 8.5 Sq. Km of South Assam Shelf Block of Golaghat district,

Assam. For development of the field, it is proposed to drill 1 well namely ELDA. The proposed

location is for augmentation of production of oil and gas from established East Lakhibari field in

Golaghat district of Assam. The expected oil is 30 m3/d.

The Khoraghat field lie in the southern fringe of Upper Assam in Dhansiri Valley. Khoraghat field

was discovered in 1989 through exploratory well KH#1(KGP#1). Proved Oil in Place (OIIP)

reserves has been estimated as 9.6 MT and ultimate recoverable reserves has been estimated

to be as 1.96 MMT with a recovery factor of 20%. For development of this field, it is proposed

to drill 3 wells in the area to augment production of oil and gas from established Khoraghat

field in Golaghat district of Assam.

1.3 Project Justification

It is expected that the proposed drilling activities lead to further development of Khoraghat

field which will augment the production of hydrocarbons, in the present scenario of growing

demand of oil and gas in the country.

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1.4 Drilling Operations

ONGC owned electrical type rigs are proposed to be deployed for undertaking drilling in the

block. The technical details of the proposed drilling activity are given below:

No. of additional wells to be drilled 8

Duration of Drilling 2-3 months for each well

Qty. of drilling fluid. About 700 M³ for each well

Qty. of cuttings, cu.m. 225 M³for each well

Qty. of drlg. Waste water, cu.m. 1000 M³ for each well

Cp-3

Test flaring, duration 2 to 3 days

Flare Details: Confined to the oil pit

Details of the drilling rig proposed to be deployed

Type of rig Electrical Rig

Drilling mud composition Water based Drilling Fluid

Power generator type & nos. AC – SCR Type. (06 Nos.)

Diesel consumption 6 M3 / Day for each well

Qty. of fresh water requirement &

source

1000 M3. Transported from nearby source through

contractor

Manpower on rig 25 per shift of 12 Hrs. Two shifts / day

Material requirement & Mobilization From ONGC base in Jorhat / Sivasagar/Nazira

Details of solids handling system on rig

Shale Shakers - 1200 GPM Capacity

Desander – 1200 GPM Capacity

Desilter – 1200 GPM Capacity

Waste Pit availability & Size

30’ x 33’ x 5’ - 2 Nos.

38’ x 33’ x 5’ – 1 No.

23’ x 20’ x 5’ – 1 No.

Oil Pit availability & Size 3’ x 3’ x 4’ – 1 No.

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Only water based drilling mud will be used. The quantity of drill cuttings generated will be

around 212 m3

. The quantity of wastewater produced will be about 15 m3/day. The rig will be

provided with solids handling system comprising Shale shakers (1200 GPM), Desander (1200

GPM) and Desilter (1200 GPM) and Degasser with vacuum pump.

Drilling operations will be carried out using an electrical type. Drilling unit for drilling of oil and

gas wells consists of a derrick at the top of which is mounted a crown block and a hoisting block

with a hook. From the swivel is suspended a Kelly stem passes through a square or hexagonal

Kelly bush which fits into the rotary table. The rotary table receives the power to drive it from

an electric motor. The electric motor rotates the rotary table which passes through the Kelly

bush and the rotations are transmitted to the bit as the drilling progresses, the drill pipe in

singles are added to continue the drilling process. At the end of the bit life, the drill pipes are

pulled out in stands and stacked on the derrick platform. A stand normally has 3 single drill

pipes. After changing the bit, the drill string is run back into the hole and further drilling is

continued. This process continues till the target depth is reached.

During the course of drilling, cuttings are generated due to crushing action of the bit. These

cuttings are removed by flushing the well with duplex/triplex mud pumps. The mud from the

pump discharge through the rotary hose connected to stationary part of the swivel, the drill

string and bit nozzles. The mud coming out of the bit nozzles pushes the cuttings up hole and

transports them to the surface through the annular space between the drill string and the hole.

The mud not only carries away crushed rock from the bottom of the hole but it also cools the

bit as it gets heated due to friction with formation while rotating. The mud also helps in

balancing subsurface formation pressures and by forming a cake on the walls of the well

diminishes the possibility of crumbling or caving of the well bore.

At the surface, the mud coming out from well along with the cuttings falls in a trough, passes

through the solids control equipments i.e. shale shaker, de-sander and de-silter. These

equipments remove the solids of different sizes which get mixed with the mud during the

course of drilling. The cleaned mud flows back to the suction tanks to be again pumped into the

well. The drilling mud/fluid circulation is thus a continuous cyclic operation. The most suitable

clay for mud preparation is bentonite which is capable of forming highly dispersed colloidal

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solutions. Various other chemicals are also used in mud preparation as per requirements

dictated by the temperature/pressure conditions of the wells. The mud is continuously tested

for its density, viscosity, yield point, water loss, pH value etc. to ensure that the drilling

operations can be sustained without any down hole complications.

1.5 Drilling Facilities

Drilling is a temporary activity which will continue for about 45 days for each well in the block.

The rigs are self-contained for all routine jobs. Once the drilling operations are completed, and

if sufficient indications of hydrocarbons are noticed while drilling, the well is tested by

perforation in the production casing. This normally takes 2-3 days. If the well is found to be a

successful hydrocarbon bearing structure, it is sealed off for future development, if any.

1.6 General Requirements of Drilling

Exploratory drilling programme requires the following common facilities:

a. Drilling muds

Drilling of wells requires specially formulated muds which basically comprise inert earth

materials like bentonite, barite in water with several additives to give mud weight, fluidity

and filter cake characteristics while drilling. The drilling muds have several functions like

lubrication and cooling of the drill bit, balancing subsurface formation, bringing out the

drill cuttings from the well bore, thixotropic property to hold cuttings during non-

operations, formation of thin cake to prevent liquid loss along well bore etc. Several

additives are mixed into the mud system to give the required properties. Water based mud

will be used to the possible extent in exploratory drilling but use of synthetic based mud

may require due to complexities associated with the geological formations and associated

hole stability problems. The constituents of water based mud (WBM) are given in Table

1.2. The special additives and their functions in WBM are shown in Table 1.3.

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b. Power Generation

The drilling process requires movement of drill bit through the draw works which require

power. The power requirement of the drilling rig will be met by using the six Diesel

Generator sets with a diesel consumption of about 06 Kl/day. The exhaust stacks of the DG

sets are likely to vent the emissions.

c. Water requirements

The water requirement in a drilling rig is mainly meant for preparation of drilling mud apart

from washings and domestic use. While the former consumes the majority of water

requirement, the water requirement for domestic and wash use is very less. The daily

water consumption will be 25 m3/d of which 15 m

3/d will be used for mud preparation and

10 m3/d will be used for domestic purposes including drinking.

d. Domestic wastewater

The operating personnel in the drilling rigs will operate from drill site accommodation

(DSA) in the vicinity of the location. Suitable soak pits will be available at the DSA.

e. Solids removal

The rock cuttings and fragments of shale, sand and silt associated with the return drilling

fluid during well drilling will be separated using shale shakers and other solids removal

equipment like desanders and desilters. The recovered mud will be reused while the

rejected solids will be collected and discharged into the waste pit.

f. Drill cuttings and waste residual muds

During drilling operations, approx 212 m3 per well of wet drill cuttings are expected to be

generated from each well depending on the type of formation and depth of drilling. In

addition to the cuttings 15-20 m3/day of wastewater is likely to be generated during well

drilling. The waste residual muds and drill cuttings which contain clay, sand etc. will be

disposed into the waste pit.

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g. Testing

Testing facilities will be available at drilling rig for separation of liquid phase and burning of

all hydrocarbons during testing. The test flare boom will be located at a distance from the

drilling rig.

h. Chemical storage

The drilling rig will have normal storage facilities for fuel oil, required chemicals and the

necessary tubulars and equipment. The storage places will be clearly marked with safe

operating facilities and practices.

i. Manpower

The drilling rig will be operated by approx. 30 persons on the rig at anytime. The

manpower will operate in two shifts with continuous operations on the rig.

j. Logistics

Crew transfers to and from the drilling rig, materials, diesel and chemicals will be through

light vehicles, trucks and trailers.

1.7 Production

After successful drilling of the wells, the produced oil & gas will be transported to Nambar GGS,

Khoraghat GGS through flowlines for further treatment and dispatch.

In Lakhibari Field, the produced oil & gas from the wells will be transported to Borhalla GGS

through tankers.

1.8 Project Investment

The total cost of drilling of 8 wells including daily drilling rates, consumables, well accessories

etc. will approximately be about Rs. 160 Crores.

of 11

Table 1.1 Coordinates of ML Blocks

Sl Name of the ML

Block

Area

(Sq Km)

Co-ordinates

Boundary

points

Latitude Longitude

Deg. Min. Sec. Deg. Min. Sec.

1 Nambar 26 N 1 26 05 47.57 93 53 12.37

N 2 26 04 46.23 93 56 07.45

N 3 26 04 09.43 93 55 19.34

N 4 26 03 25.27 93 56 03.89

N 5 26 02 31.29 93 55 37.16

N 6 26 02 37.43 93 52 05.45

2 East Lakhibari 8.5 1 A 26 22 50.45 94 02 55.50

2 B 26 22 05.45 94 04 25.50

3 C 26 21 04.09 94 03 31.50

4 D 26 22 07.20 94 00 54.00

1 A 26 22 50.45 94 02 55.50

1 A 26 22 50.45 94 02 55.50

2 B 26 22 05.45 94 04 25.50

3 Khoraghat ML 3 1 A 26 04 09.43 93 55 19.34

2 B 26 04 46.23 93 56 07.45

3 C 26 04 05.34 93 56 52.89

4 D 26 03 25.27 93 56 03.89

1 A 26 04 09.43 93 55 19.34

4 Khoraghat Extn. ML 83 1 A 26 05 47.57 93 53 12.37

2 B 26 09 23.07 93 56 06.58

3 C 26 09 12.44 93 59 55.55

4 D 26 02 25.57 93 58 17.54

5 E 26 02 31.29 93 55 37.36

6 F 26 03 25.27 93 56 03.89

7 G 26 04 05.34 93 56 52.89

8 H 26 04 46.23 93 56 07.45

1 A 26 05 47.57 93 53 12.37

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Table 1.2 Ingredients of Water Based Drilling Fluid

S. No Chemicals

1 Barite

2 Bentonite

3 Carboxy Methyl Cellulose

4 Mud Thinner / Conditioner

5 Resinated Lignite

6 Non-Weighted Spotting Fluid

7 Weighted Spotting Fluid

8 EP Lube

9 Drilling Detergent

10 Caustic Soda

11 Potassium Chloride

12 Soda Ash

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Table 1.3 Special Additives and their Functions in Water-based Drilling Fluids

Sr.

No

Discharge Category Exploration

1 Sodium bicarbonate Eliminate excess calcium ions due to

cement contamination

2 Sodium chloride Minimize borehole washout in salt zone

3 Groundnut shells, mica of cellophane Minimise loss of drilling mud to formation

4 Cellulose polymers or starch Counter thick, sticky filter cake, decrease

filter loss to formation

5 Aluminium stearate Minimize foaming

6 Vegetable oil lubricant Reduce torque and drag on drill string

7 Pill of oil-based mud spotting fluid Counter differential pressure sticking of

drilling string; Pill is placed down hole

opposite contact zone to free pipe

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FORM 1

Developmental Drilling at Borholla by ONGC Ltd

I Basic Information:

Sl Item Detail

1. Name of the project/s Development drilling of 4 wells in

Borholla Oil and Gas Field in Jorhat

District, Assam

2. S. No in the Schedule 1(b)

3. Proposed Capacity/ area/length/ tonnage to be

handled/ command area/ lease area/ number of wells

to be drilled

Area - Borholla ML area (32.116 Sq km)

Total Number of Wells – 4

(BRDN, BRDO + 2 additional wells)

4. New/Expansion/ Modernization Expansion

5. Existing capacity/Area etc. NA

6. Category of Project i.e. ‘A’ or ‘B’ A

7. Does it attract the general condition? If yes, please

specify.

No

8. Does it attract the specific condition? If yes, please

specify.

No

9. Location Jorhat District

Plot/Survey/Khasra No

Village

Tehsil

District Jorhat

State Assam

10. Nearest railway station/airport along with distance in

kms.

Mariani Railway station / Jorhat airport

11. Nearest Town, city, District Headquarters along with

distance in kms.

Jorhat Town

12. Village Panchayats, Zilla Parishad, Municipal

Corporation, Local body (Complete postal addresses

with telephone nos. to be given

Chief Executive Officer

Jorhat Zila Parishad

Jorhat, Assam

13. Name of the applicant Sub-Surface Manager, Assam Asset

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Sl Item Detail

14. Registered Address ONGC Ltd, 124 Indira Chowk Connaught

Place, New Delhi 110001

15. Address for correspondence

Name B.K. Baruah

Designation Asset Manager

Address ONGC Nazira, Sivasagar

Pin Code 785685

E-mail [email protected]

Telephone No. 03772-252300

Fax No 03772-252243

16. Details of Alternative Sites Examined, if any location of

these sites should be shown on topo sheet.

No

17. Interlinked Project No

18. Whether separate application for interlinked project

has been submitted?

N/A

19. If yes, date of submission N/A

20. If no, reason N/A

21. Whether the proposal involves approval/ clearance

under: if yes, details of same and their status to be

given.

(a) The Forest(Conservation) Act, 1980

(b) The Wildlife (Protection) Act,1972

(c) The C.R.Z Notification

N/A

22. Whether there is any Government Order/Policy

relevant/relating to the site

No

23. Forest land involved Yes

24. Whether there is any litigation pending against the

project and/or land in which the project is proposed to

set up?

(a) Name of the Court

(b) Case No

(c) Orders/ directions of the Court, if any and its

relevance with the project

N/A

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II Activity

1. Construction, operation or decommissioning of the Project involving actions, which

will cause physical changes in the locality (topography, land use, changes in water

bodies, etc.)

S.

No.

Information/Checklist confirmation Yes/No Details thereof (with approximate

quantities / rates, wherever possible)


1.1 Permanent or temporary change in land use, land

cover or topography including increase in

intensity of land use (with respect to local land

use plan)

Yes There will be a permanent change in

land use. However land will be restored

after drilling.

1.2 Clearance of existing land, vegetation and

buildings?

Yes Approximately 2 Ha land will have to be

cleared for each drilling locations and its

associated activities.

1.3 Creation of new land uses? Yes Same as Sl. No. 1.1 above

1.4 Pre-construction investigations e.g. bore houses,

soil testing?

No Hard field area. Normally soil testing

not essential for shallow / temporary

foundation for deployment of rig.

1.5 Construction works? Yes Construction of plinth area, foundation

for rig & its accessories, temporary

sheds, cellar pit and

cutting retainer pits as per standard lay-

out drawing of the drilling rig.

1.6 Demolition works? No

1.7 Temporary sites used for construction works or

housing of construction workers?

Yes Construction workers will stay in

temporary camps.

1.8 Above ground buildings, structures or earthworks

including linear structures, cut and fill or

excavations

Yes Earth filling is required to prepare

plinth.

1.9 Underground works including mining or

tunneling?

Yes The well bore hole will be drilled up to a

maximum depth of 3500m each.

1.10 Reclamation works? No

1.11 Dredging? No

1.12 Offshore structures? No

1.13 Production and manufacturing processes? Yes Oil Gas produced will be processed in

existing GGS Production testing of each

well will require at least about15 days

1.14 Facilities for storage of goods or materials? Yes Mechanical and drilling spares and

drilling chemicals in temporary sheds.

1.15 Facilities for treatment or disposal of solid waste Yes Solid waste / drilled rock cuttings will be

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or liquid effluents? confined within the waste pit.

1.16 Facilities for long term housing of operational

workers?

No

Rig workers are operating on 14 days

on/off pattern from their respective

hometowns.

1.17 New road, rail or sea traffic during construction or

operation?

Yes Approach roads will have to be

constructed for al the drilling locations

for movement of men and

materials to the sites.

1.18 New road, rail, air waterborne or other transport

infrastructure including new or altered routes and

stations, ports, airports etc?

No

1.19 Closure or diversion of existing transport routes or

infrastructure leading to changes in traffic

movements?

No

Partial closure of existing routes may be

required for very short periods on

account of improvement of road

condition. However, it will not lead to

any major change of the existing route

or traffic system.

1.20 New or diverted transmission lines or pipelines?

No

1.21 Impoundment, damming, culverting, realignment

or other changes to the hydrology of

watercourses or aquifers?

No

1.22 Stream crossings?

Yes

Stream crossing if any, will be done by

building suitable culverts or bailey

bridge.

1.23 Abstraction or transfers of water form ground or

surface waters?

Yes

Surface water / Bore wells as per

requirement/availability.

1.24 Changes in water bodies or the land surface

affecting drainage or run-off?

No

1.25 Transport of personnel or materials for

construction, operation or decommissioning?

Yes

Rig personal operate from the drill site

accommodation (bunk houses)

1.26 Long-term dismantling or decommissioning or

restoration works?

No

1.27 Ongoing activity during decommissioning which

could have an impact on the environment?

No

1.28 Influx of people to an area in either temporarily or

permanently?

Yes Temporary. Movement of Field

personnel during drilling operations.

1.29 Introduction of alien species? No

1.30 Loss of native species or genetic diversity? No

1.31 Any other actions? Nil

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2. Use of Natural resources for construction or operation of the Project (such as land,

water, materials or energy, especially any resources which are non-renewable or in short

supply):

S. No. Information / checklist confirmation Yes / No Details thereof (with approximate

quantities /rates, wherever possible)


2.1 Land especially undeveloped or agricultural land

(ha)

yes Nearly 2.2 Ha of land for each drilling

location will be required.

2.2 Water (expected source & competing users)

unit: KLD

Yes 20-25 m3 / day for Drilling

2.3 Minerals (MT) Nil

2.4 Construction material – stone, aggregates, and /

soil (expected source – MT)

Yes Sand / Stone / Cement 100 Tonnes from

nearby dealers

2.5 Forests and timber (source – MT) No

2.6 Energy including electricity and fuels (source,

competing users) Unit: fuel (MT), energy (MW)

Yes 6 KL./day (Diesel for running captive

Gensets) - Drilling rigs

2.7 Any other natural resources (use appropriate

standard units)

No

3. Use, storage, transport, handling or production of substances or materials, which

could be harmful to human health or the environment or raise concerns about actual

or perceived risks to human health.

S. No. Information/Checklist confirmation Yes / No Details thereof (with approximate



3.1 Use of substances or materials, which are

hazardous (as per MSIHC rules) to human health

or the environment (flora, fauna, and water

supplies)

No

3.2 Changes in occurrence of disease or affect

disease vectors (e.g. insect or water borne

diseases)

No

3.3 Affect the welfare of people e.g. by changing

living conditions?

No

3.4 Vulnerable groups of people who could be

affected by the project e.g. hospital patients,

children, the elderly etc.,

No

3.5 Any other causes Nil

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4. Production of solid wastes during construction or operation or decommissioning

(MT/month)


No



of information data

4.1 Spoil, overburden or mine wastes Yes Drilled cuttings generated will be about 212 m3

during the drilling over a period of 40-45 days

4.2 Municipal waste (domestic and or

commercial wastes)

No Septic tank will be provided for toilets in the drill

site (Sewage about 10 m3/day

4.3 Hazardous wastes (as per Hazardous Waste

Management Rules)

Yes 1. Spent oil

2. Waste Drilling mud

4.4 Other industrial process wastes Nil

4.5 Surplus product Nil

4.6 Sewage sludge or other sludge from effluent

treatment

Yes Oily sludge will be collected and disposed by

bioremediation

4.7 Construction or demolition wastes Will be disposed of for in surface hardening within

drill site area.

4.8 Redundant machinery or equipment Nil

4.9 Contaminated soils or other materials Nil Will be confined in impermeable waste pit within

the drill site area.

4.10 Agricultural wastes Nil

4.11 Other solid wastes Nil

5. Release of pollutants or any hazardous, toxic or noxious substances to air (Kg/hr)


No



of information data

5.1 Emissions from combustion of fossil fuels

from stationary or mobile sources

Yes Emissions from Captive Gensets (Rating: 6 x 750

KW) Only 3 units will be normally operated for

drilling rig.

5.2 Emissions from production processes

Yes If the well is hydrocarbon bearing during

production testing flaring of well fluids for a short

period of time.

5.3 Emissions from materials handling including

storage or transport

No

5.4 Emissions from construction activities

including plant and equipment

Nil

5.5 Dust or odors from handling of materials

including construction materials, sewage and

waste

Nil

5.6 Emissions from incineration of waste Nil

5.7 Emissions from burning of waste in open air

(e.g. slash materials, construction debris)

Nil

5.8 Emissions from any other sources Nil

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6. Generation of Noise and Vibration, and Emissions of Light and Heat:

S. No. Information/Checklist confirmation

Yes/No



with source of information data with

source of information data

6.1 From operation of equipment e.g. engines,

ventilation plant, crushers

Yes Within 75 dB

Noise levels within permissible limits

(Personal Protective Equipment will be

provided if required)

6.2 From industrial or similar processes Yes Within 75 dB

6.3 From construction or demolition Nil

6.4 From blasting or piling Nil

6.5 From construction or operational traffic Nil

6.6 From lighting or cooling systems Nil

6.7 From any other sources Nil

7. Risks of contamination of land or water from releases of pollutants into the ground or

into sewers, surface waters, groundwater, coastal waters or the sea:

S. No. Information/Checklist confirmation Yes/No Details thereof (with approximate



7.1 From handling, storage, use or spillage of

hazardous materials

No All effluents will be confined within

impermeable waste pits

7.2 From discharge of sewage or other effluents to

water or the land (expected mode and place of

discharge)

No -do-

7.3 By deposition of pollutants emitted to air into the

land or into water

No

7.4 From any other sources No

7.5 Is there a risk of long term build up of pollutants

in the environment from these sources?

No Development drilling is a temporary

activity lasting 2 to 3 months.

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8. Risk of accidents during construction or operation of the Project, which could affect

human health or the environment





8.1 From explosions, spillages, fires etc from storage,

handling, use or production of hazardous

substances

Nil

8.2 From any other causes Yes Development drilling has the potential

risk of blow outs which will be handled as

per existing contingency plan.

8.3 Could the project be affected by natural disasters

causing environmental damage (e.g. floods,

earthquakes, landslides, cloudburst etc)?

Yes

9. Factors which should be considered (such as consequential development) which could

lead to environmental effects or the potential for cumulative impacts with other existing or

planned activities in the locality





9.1 Lead to development of supporting facilities,

ancillary development or development stimulated

by the project which could have impact on the

environment e.g.:

• Supporting infrastructure (roads, power supply,

waste or waste water treatment, etc.)

• housing development

• extractive industries

• supply industries

• other

Yes

If the Development drilling is successful

supporting infrastructure road, power

supply will be developed.

9.2 Lead to after-use of the site, which could have an

impact on the environment

No

9.3 Set a precedent for later developments Nil

9.4 Have cumulative effects due to proximity to other

existing or planned projects with similar effects

Nil No industries is nearby

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III. Environmental Sensitivity:

S. No.

Areas

Name/

Identity

Aerial distance (within 15 km.) Proposed

project location boundary

1 Areas protected under international conventions,

national or local legislation for their ecological,

landscape, cultural or other related value

None

2 Areas which are important or sensitive for

ecological reasons -Wetlands, watercourses or

other water bodies, coastal zone, biospheres,

mountains, forests

None

3 Areas used by protected, important or sensitive

species of flora or fauna for breeding, nesting,

foraging, resting, over wintering, migration

Nil

4 Inland, coastal, marine or underground waters Nil

5 State, National boundaries No

6 Routes or facilities used by the public for access

to recreation or other tourist, pilgrim areas

None

7 Defence installations Nil

8 Densely populated or built-up area No

9 Areas occupied by sensitive man-made land uses

(hospitals, schools, places of worship, community

facilities)

No

10 Areas containing important, high quality or scarce

resources (ground water resources, surface

resources, forestry, agriculture, fisheries, tourism,

minerals)

Nil

11 Areas already subjected to pollution or

environmental damage. (those where existing

legal environmental standards are exceeded)

N/A

12 Areas susceptible to natural hazard which could

cause the project to present environmental

problems (earthquakes, subsidence, landslides,

erosion, flooding or extreme or adverse climatic

conditions)

Nil

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IV Proposed Terms of Reference for EIA studies

1. Project techno-economic feasibility

2. Justification for locations considered for development drilling

3. Baseline studies for Air / water quality in the proposed development drilling

locations.

4. Site specific data collection for air / water quality within the vicinity of the drill site

5. Socio-economic impact of development drilling activity.

6. Identification of environmental impacts and mitigation measures

7. Environment management plan for the proposed drilling

I hereby give undertaking that the data and information given in the application and enclosures

are true to the best of my knowledge and belief and I am aware that if any part of the data and

information submitted is found to be misleading at any stage the project will be rejected and

clearance give, if any to the project will be revoked at our risk and cost

Date:

Place:

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Pre-feasibility Report

Development Drilling for 4 wells in Borholla ML area by ONGC Ltd

Introduction

The Borholla ML. area covers 32.116 Sq. Km of South Assam Shelf Block in Golaghat district,

Assam. During the year 2013-15, 4 development locations are planned to be taken up for drilling

which falls in the ML area. It is expected that the proposed drilling activities will lead to augment

the production of hydrocarbons in the present scenario of growing demand of oil and gas in the

country.

1.1 Description of Contract Area

ML Block Area, km2 Wells Latitude Longitude Depth, m

Borholla 32.116 BRDO 26o

27' 13.25” 94o

10' 26.17” 2722

BRDN 26o

26' 01.20” 94o 10' 9.39” 2700

2 unnamed - - -

1.2 Proposed Project

Based on the Studies carried out by Institute of Reservoir Studies, two development locations

BRDN & BRDO are proposed to be drilled alongwith 2 more locations whose locations are yet to

be finalised.

1.2.1 Geological setting of the area falling in Borholla ML Block.

The Borholla filed is located about 35kms SSE of Jorhat, along the Naga hills. There are four oil

bearing formations i.e. Basement, Basal Sandstone, Sylhet, Kopili, and two gas bearing formations

i.e. Tipam and Girujan (from Bottom to top). Structurally, Borholla is a faulted anticline located on

an E-W trending ridge, bounded to the North and South by deep grabens. Faults divide Borholla

filed in to many faults blocks. The oil was discovered in basal sandstone in year 1970 through

BR#04 and commercially production started in year 1981

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1.3 Project Justification

It is expected that the proposed drilling activities lead to the accretion of the hydrocarbon reserves

which will augment the production of hydrocarbons, in the present scenario of growing demand of

oil and gas in the country.

1.4 Drilling Operations

ONGC owned electrical type rigs are proposed to be deployed for undertaking drilling in the block.

The technical details of the proposed drilling activity are given below:

Well location Borholla

No. of wells to be drilled 4

Duration of Drilling 2-3 months for each well

Qty. of drilling fluid. About 700 M³ for each well

Qty. of cuttings, cu.m. 225 M³for each well

Qty. of drlg. Waste water, cu.m. 1000 M³ for each well

Development plan in case of strike To take production from the well through existing

flowlines

HC reserve (initial in place) 2.17 MMt

Formation pressure 157.47 KSc

Test flaring, duration 2 to 3 days

Flare Details: Confined to the oil pit

Details of the drilling rig proposed to be deployed

Type of rig Electrical Rig

Drilling mud composition Water based Drilling Fluid

Power generator type & nos. AC – SCR Type. (06 Nos.)

Diesel consumption 6 M3 / Day for each well

Qty. of fresh water requirement &

source

1000 M3. Transported from nearby source through

contractor

Manpower on rig 25 per shift of 12 Hrs. Two shifts / day

Material requirement & Mobilization From ONGC base in Jorhat / Sivasagar/Nazira

Details of solids handling system on rig

Shale Shakers - 1200 GPM Capacity

Desander – 1200 GPM Capacity

Desilter – 1200 GPM Capacity

Waste Pit availability & Size

30’ x 33’ x 5’ - 2 Nos.

38’ x 33’ x 5’ – 1 No.

23’ x 20’ x 5’ – 1 No.

Oil Pit availability & Size 3’ x 3’ x 4’ – 1 No.

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Only water based drilling mud will be used. The quantity of drill cuttings generated will be around

225 m3

. The quantity of wastewater produced will be about 15 m3/day. The rig will be provided

with solids handling system comprising Shale shakers (1200 GPM), Desander (1200 GPM) and

Desilter (1200 GPM) and Degasser with vacuum pump.

Drilling operations will be carried out using an electrical type. Drilling unit for drilling of oil and gas

wells consists of a derrick at the top of which is mounted a crown block and a hoisting block with a

hook. From the swivel is suspended a Kelly stem passes through a square or hexagonal Kelly bush

which fits into the rotary table. The rotary table receives the power to drive it from an electric

motor. The electric motor rotates the rotary table which passes through the Kelly bush and the

rotations are transmitted to the bit as the drilling progresses, the drill pipe in singles are added to

continue the drilling process. At the end of the bit life, the drill pipes are pulled out in stands and

stacked on the derrick platform. A stand normally has 3 single drill pipes. After changing the bit,

the drill string is run back into the hole and further drilling is continued. This process continues till

the target depth is reached.

During the course of drilling, cuttings are generated due to crushing action of the bit. These

cuttings are removed by flushing the well with duplex/triplex mud pumps. The mud from the

pump discharge through the rotary hose connected to stationary part of the swivel, the drill string

and bit nozzles. The mud coming out of the bit nozzles pushes the cuttings up hole and transports

them to the surface through the annular space between the drill string and the hole. The mud not

only carries away crushed rock from the bottom of the hole but it also cools the bit as it gets

heated due to friction with formation while rotating. The mud also helps in balancing subsurface

formation pressures and by forming a cake on the walls of the well diminishes the possibility of

crumbling or caving of the well bore.

At the surface, the mud coming out from well along with the cuttings falls in a trough, passes

through the solids control equipments i.e. shale shaker, de-sander and de-silter. These equipments

remove the solids of different sizes which get mixed with the mud during the course of drilling.

The cleaned mud flows back to the suction tanks to be again pumped into the well. The drilling

mud/fluid circulation is thus a continuous cyclic operation. The most suitable clay for mud

preparation is bentonite which is capable of forming highly dispersed colloidal solutions. Various

other chemicals are also used in mud preparation as per requirements dictated by the

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temperature/pressure conditions of the wells. The mud is continuously tested for its density,

viscosity, yield point, water loss, pH value etc. to ensure that the drilling operations can be

sustained without any down hole complications.

1.5 Drilling Facilities

Drilling is a temporary activity which will continue for about 2-3 months for each well in the block.

The rigs are self-contained for all routine jobs. Once the drilling operations are completed, and if

sufficient indications of hydrocarbons are noticed while drilling, the well is tested by perforation in

the production casing. This normally takes 2-3 days. If the well is found to be a successful

hydrocarbon bearing structure, it is sealed off for future development, if any.

1.6 General Requirements of Drilling

Exploratory drilling programme requires the following common facilities:

a. Drilling muds

Drilling of wells requires specially formulated muds which basically comprise inert earth

materials like bentonite, barite in water with several additives to give mud weight, fluidity and

filter cake characteristics while drilling. The drilling muds have several functions like

lubrication and cooling of the drill bit, balancing subsurface formation, bringing out the drill

cuttings from the well bore, thixotropic property to hold cuttings during non-operations,

formation of thin cake to prevent liquid loss along well bore etc. Several additives are mixed

into the mud system to give the required properties. Water based mud will be used to the

possible extent in exploratory drilling but use of synthetic based mud may require due to

complexities associated with the geological formations and associated hole stability problems.

The constituents of water based mud (WBM) are given in Table 1.2. The special additives and

their functions in WBM are shown in Table 1.3.

b. Power Generation

The drilling process requires movement of drill bit through the draw works which require

power. The power requirement of the drilling rig will be met by using the six Diesel Generator

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sets with a diesel consumption of about 06 Kl/day. The exhaust stacks of the DG sets are likely

to vent the emissions.

c. Water requirements

The water requirement in a drilling rig is mainly meant for preparation of drilling mud apart

from washings and domestic use. While the former consumes the majority of water

requirement, the water requirement for domestic and wash use is very less. The daily water

consumption will be 25 m3/d of which 15 m

3/d will be used for mud preparation and 10 m

3/d

will be used for domestic purposes including drinking.

d. Domestic wastewater

The operating personnel in the drilling rigs will operate from drill site accommodation (DSA) in

the vicinity of the location. Suitable soak pits will be available at the DSA.

e. Solids removal

The rock cuttings and fragments of shale, sand and silt associated with the return drilling fluid

during well drilling will be separated using shale shakers and other solids removal equipment

like desanders and desilters. The recovered mud will be reused while the rejected solids will

be collected and discharged into the waste pit.

f. Drill cuttings and waste residual muds

During drilling operations, approx. 225 m3 per well of wet drill cuttings are expected to be

generated from each well depending on the type of formation and depth of drilling. In

addition to the cuttings 15-20 m3/day of wastewater is likely to be generated during well

drilling. The waste residual muds and drill cuttings which contain clay, sand etc. will be

disposed into the waste pit.

g. Testing

Testing facilities will be available at drilling rig for separation of liquid phase and burning of all

hydrocarbons during testing. The test flare boom will be located at a distance from the drilling

rig.

h. Chemical storage

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The drilling rig will have normal storage facilities for fuel oil, required chemicals and the

necessary tubulars and equipment. The storage places will be clearly marked with safe

operating facilities and practices.

i. Manpower

The drilling rig will be operated by approx. 30 persons on the rig at anytime. The manpower

will operate in two shifts with continuous operations on the rig.

j. Logistics

Crew transfers to and from the drilling rig, materials, diesel and chemicals will be through

light vehicles, trucks and trailers.

1.7 Production

After successful drilling of the wells, the produced oil & gas will be transported to Borholla GGS

through flowlines for further treatment and dispatch.

1.8 Project Investment

The total cost of drilling of 4 wells including daily drilling rates, consumables, well accessories etc.

will approximately be about Rs. 80 Crores.

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Table 1.1 showing the coordinates of Borholla PML Blocks

Sl.

No.

Name of the

Block Area

Co-ordinates

Latitude Longitude

Boun-

dary

points

Deg. Min. Sec. Deg. Min. Sec.

BORHOLLA

1

Borholla ML

32.116

SKM

A 26 29 27.29 94 12 59.72

F 26 23 04.56 94 10 50.52

L 26 22 31.85 94 08 03.01

K 26 23 51.99 94 08 03.01

M 26 24 08.35 94 09 45.48

N 26 27 49.15 94 09 12.51

Table 1.2 Ingredients of Water Based Drilling Fluid

S. No Chemicals

1. Barite

2. Bentonite

3. Carboxy Methyl Cellulose

4. Mud Thinner / Conditioner

5. Resinated Lignite

6. Non-Weighted Spotting Fluid

7. Weighted Spotting Fluid

8. EP Lube

9. Drilling Detergent

10. Caustic Soda

11. Potassium Chloride

12. Soda Ash

of 9

Table 1.3 Special Additives and their Functions in Water-based Drilling Fluids

Sr. No. Discharge Category Exploration

1. Sodium bicarbonate Eliminate excess calcium ions due to cement

contamination

2. Sodium chloride Minimize borehole washout in salt zone

3. Groundnut shells, mica of

cellophane

Minimise loss of drilling mud to formation

4. Cellulose polymers or starch Counter thick, sticky filter cake, decrease filter

loss to formation

5. Aluminium stearate Minimize foaming

6. Vegetable oil lubricant Reduce torque and drag on drill string

7. Pill of oil-based mud spotting

fluid

Counter differential pressure sticking of drilling

string; Pill is placed down hole opposite contact

zone to free pipe

AANNNNEEXXUURREE –– IIII

CCOOPPYY OOFF EEXXIISSTTIINNGG EECC,, CCTTOO AANNDD CCOOMMPPLLIIAANNCCEE

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Speed post

Government of India Ministry of Environment & Forests

(IA Division) Paryavaran Bhawan

CGO Complex, Lodhi Road New Delhi – 110 003

E-mail: [email protected] Telephone: 011: 2436 7076

F. No. J-11011/147/2008-IA-II(I) Dated : June 24, 2009 To

The Block Manager, M/s ONGC Limited South Assam Shelf Block, 1st Floor, LuitBhawan, Chinnamara Complex, Jorhat – 785704, Assam

Sub: Exploratory drilling of 30 wells in PEL/ML Blocks of South Assam Shelf Block (Golaghat, Jorhat, Nagaon, Morigaon, North Cachar, Darrang and Sonitpur Districts) at District Jorhat Assam By M/s ONGC Limited – Environmental Clearance reg.

Sir, This has reference to your application No. CHSE/CHSE/ENV/2007-08 dated 7th

February, 2008 alongwith Form-1 and prefeasibility report seeking environmental clearance under EIA Notification 2006 subsequent submission the hydrocarbon content of methane and non-methane monitoring report to the Ministry vide letter dated 17.01.2009 and circulated to Expert Appraisal Committee (Industry) during 93rd meeting of the Expert Appraisal Committee (Industry) held on 14th –16th April, 2009. 2. The Ministry of Environment and Forests has examined the application. It is noted that the proposal is for environmental clearance for Onshore Exploratory drilling of 30 wells in PEL/ML Blocks of South Assam Shelf Block (Golaghat, Jorhat, Nagaon, Morigaon, North Cachar, Darrang and Sonitpur Districts) at District Jorhat Assam By M/s ONGC Limited. The South Assam Shelf Block a part of Assam and AssamArakanBasin, consists broadly of the Titabar, Borholla , Mekrang , Merapani, Kalyanpur, Kasomarigaon, East Lakhibari, Khoraghat and Nambar, areas within the State of Assam. This proposal is for environmental clearance for exploratory drilling of 30 wells in various PEL’s and ML’swithin Golaghat District and Jorhat districts except KarbiAnglong PEL area which falls in the KarbiAnglong district and Kopili Valley PEL area which extends across the KarbiAnglong, Nagaon, Morigaon, North Cachar, Darrang and Sonitpur districts of Assam. Out of 30 new locations, 4 locations KHG, TBAA, CJAA and BRAI are released and remaining 26 new locations will be added on the basis of ongoing R & D studies. The areas lie between 25° 38’ and 26°32’ North latitude and between 92°15’ and 94° 16` East longitude and have an average elevation of around 100 metres above mean sea level. Total area of PEL/ML block is about 727 sq km, but area of each drill site would be approx. 1.80 hectare and will be acquired on lease. The oil and gas reservoirs in the above said hydrocarbon prospective area occur at depths ranging from 2000 to 3000 m below surface except a few

mailto:[email protected]

shallow gas reservoirs in the depth range of 400 to 1500 mts. Total cost of project for drilling of the 30 wells will be approx. Rs. 400 Crores.The area-wise distribution of proposed locations for Environmental Clearance is as under:- Areas PEL / MLs Name Districts Total Area

(Sq Km) Locations proposed

Titabar, BorhollaMekrang

Titabar PEL, Borholla ML, Mekrang ML

Jorhat 149 10

Merapani ,Kalyanpur Kasomarigaon, East Lakhibari

Merapani PEL, East Lakhibari ML, Golaghat Extn IIA PEL (North)

Golaghat 252 10

Khoraghat, Nambar Golaghat Extn IIA PEL (South), Golaghat Dist PEL, Khoraghat Extn ML, Khoraghat ML, Nambar ML

Golaghat 327 10

Total 727 30 3. It is noted that only water based drilling fluid will be used. The water requirement will be approx. 25 m3/day and will be met from deep tube wells. The quantity of waste water produced will be approx. 15 m3/day in a well. About 150 to 250 m3/well of drill cuttings will be generated and the cuttings including wash water shall be collected in HDPE lined disposal pit. The effluent/ waste water will be treated by a Mobile ETP and the water will be reused / recycled as technical water. The Drilled cuttings about 150-250 m3/well will be generated as solid waste. The cuttings will be disposed off as per MOEF guideline. Two DG sets are used at a time. Exhaust height attached to DG sets shall be as per EPA and rules. For captive Gen-sets 4 KL/day of diesel per well will be required.

4. All the onshore and offshore oil and gas exploration, development and production activities are listed at 1(b) under ‘A’ category in the Schedule of EIA Notification, 2006. The proposal appraised in 83rd meeting of the Expert appraisal Committee (Industry) held during 14th -16th July 2008 and reconsidered during 93rd meeting held on 14th –16th April, 2009 at central level. Public hearing/public consultation was exempted as per para 7(ii) of the EIA Notification, 2006. 4. The Ministry of Environment and Forests hereby accords environmental clearance to the above project under the provisions of EIA Notification, 2006 subject to compliance of the following Specific and General Conditions. A. SPECIFIC CONDITIONS: i. Compensation for the land acquisition to the land oustees (if any) and for standing crop shall be

paid as per the National Resettlement and Rehabilitation Policy (NRRP) 2007/State Government norms. It may be ensure that compensation provided shall not be less than the norms of the NRRP 2007.

ii. The company shall obtain forest clearance under Forests Conservation Act 1980 for the sites

located within the forest areas.

iii. The company shall obtain permission to establish under Air and water acts from State Pollution Control Board for each well and copy submitted to Ministry’s Regional Office at Shillong.

iv. The company shall inform the details of the each drill site to Ministry’s Regional Office at

Shillong. v. The company shall make the arrangement for control of noise from the drilling activity and from

DG sets. vi. The company shall comply with the guidelines for disposal of solid waste, drill cutting and

drilling fluids for onshore drilling operation notified vide GSR.546(E) dated 30th August, 2005. vii. The surface facilities shall be installed as per applicable codes and standards, international

practices and applicable local regulations. viii. The top soil removed shall be stacked separately for reuse during restoration process. ix. Drilling waste water including drill cuttings wash water shall be collected in disposal pit lined

with HDPE lining evaporated or treated and shall comply with the notified standards for on-shore disposal. The membership of common TSDF shall be obtained for the disposal of drill cuttings and hazardous waste. Otherwise secured land fill shall be created at the site as per the design of the secured shall be approved by the CPCB and obtain the authorization of the SPCB. Copy of authorization or membership of TSDF shall be submitted to Ministry’s Regional Office.

x. The company shall construct the garland drain all around the drilling site to prevent runoff of any

oil containing waste in to the nearby water bodies. xi. The recyclable waste (oily sludge) and spent oil shall be disposed of to the authorized recyclers. xii. Only water based drilling mud shall be used. The drilling mud shall be recycled. In case of use of

synthetic oil based mud due to any problem due to geological formation for drilling, low toxicity, Oil Based Mud (OBM) having aromatic content < 1 % shall be used. If it is intended to use such OBM/SBM to mitigate specific hole problem, it should be intimated to Ministry of Environment and Forests/ SPCB.

xiii. Quantities of storage and chemicals and additives required for drilling mud preparation shall be

below the specified threshold for specified storage permitted under the MSIHC Rules. xiv. Pre hire rig inspection, safety meetings, tool box meeting, job safety analysis and audits shall be

carried out to identify hidden /potential hazardous. xv. The Company shall take necessary measures to prevent fire hazards, containing oil spill and soil

remediation as needed. At place of ground flaring, the overhead flaring stack with knockout drums shall be installed to minimize gaseous emissions during flaring.

xvi. The Company shall take necessary measures to reduce noise levels at the drill site by providing

mitigation measures such as proper acoustic enclosures to the DG set and meet the norms notified by the MoEF. Height of all the stacks/vents shall be provided as per the CPCB guidelines.

xvii. To prevent fire and explosion at Oil and Gas facility, potential ignition sources should be kept to a minimum and adequate separation distance between potential ignition sources and flammable material should be in place.

xviii. The company shall develop a contingency plan for H2S release including all necessary aspects

from evacuation to resumption of normal operations. The workers should be provided with personal H2S detectors in locations of high risk of exposure along with self containing breathing apparatus.

xix. To prevent well blowouts during drilling operations, Blow OutPreventor (BOP) system shall be

installed. Blow Out Prevention measures during drilling shall focus on maintaining well bore hydrostatic pressure by proper pre-well planning and drilling fluid logging etc.

xx. The company shall take measures after completion of drilling process by well plugging and

secured enclosures, decommissioning of rig upon abandonment of the well and drilling site shall be restored the are in original condition. In the event that no economic quantity of hydrocarbon is found a full abandonment plan shall be implemented for the drilling site in accordance with the applicable Indian Petroleum Regulations.

xxi. Occupational health surveillance of the workers shall be carried out as per the prevailing Acts and

Rules.

xxii. In case the commercial viability of the project is established, the Company shall prepare a detailed plan for development of oil and gas fields and obtain fresh clearance from the Ministry.

xxiii. The company shall provide housing for construction labour within the site with all necessary infrastructure and facilities such as fuel for cooking, mobile toilets, mobile STP, safe drinking water, medical health care, crèche etc. The housing may be in the form of temporary structures to be removed after the completion of the project.

B. GENERAL CONDITIONS: i. The project authorities must strictly adhere to the stipulations made by the State Pollution Control

Board, the State Government and any other statutory. ii. No further expansion or modification in the project shall be carried out without prior approval of

the Ministry of Environment & Forests. In case of deviations or alterations in the project proposal from those submitted to this Ministry for clearance, a fresh reference shall be made to the Ministry to assess the adequacy of conditions imposed and to add additional environmental protection measures required, if any.

iii. The emissions of (RSPM, SPM, SO2, NOx, HC& VOC) from DG Set and from flare stack shall

conform to the standards prescribed by the SPCB. Regular monitoring of Ambient Air for HC and VOC shall be carried out as per CPCB guidelines. Stack height attached to DG sets shall be in-conformance with the environment protection acts and rules.

iv. The project authorities must strictly comply with the rules and regulations under Manufacture,

Storage and Import of Hazardous chemicals Rules, 1989 as amended subsequently. Prior approvals from Chief Inspectorate of Factories, Chief Controller of Explosives, Fire Safety Inspectorate etc. must be obtained, wherever applicable.

v. The project authorities must strictly comply with the rules and regulation with regard to handling and disposal of Hazardous Wastes (Management and Handling) Rules, 1989/ 2003 wherever applicable. Authorization form the State Pollution Control Board must be obtained for collections/treatment/storage/disposal of hazardous wastes.

vi. The overall noise levels in and around the plant area shall be kept well within the standards by

providing noise control measures including acoustic hoods, silencers, enclosures etc. on all sources of noise generation. The ambient noise levels shall conform to the standards prescribed under EPA Rules, 1989 viz. 75 dBA (daytime) and 70 dBA (nighttime).

vii. A separate Environmental Management Cell equipped with full fledged laboratory facilities must

be set up to carry out the environmental management and monitoring functions. viii. The project authorities will provide adequate funds both recurring and non-recurring to

implement the conditions stipulated by the Ministry of Environment and Forests as well as the State Government along with the implementation schedule for all the conditions stipulated herein. The funds so provided shall not be diverted for any other purposes.

ix. The Regional Office of this Ministry/Central Pollution Control Board/State Pollution Control

Board will monitor the stipulated conditions. A six monthly compliance report and the monitored data along with statistical interpretation shall be submitted to them regularly.

x. The Project Proponent shall inform the public that the project has been accorded environmental

clearance by the Ministry and copies of the clearance letter are available with the State Pollution Control Board and may also be seen at Website of the Ministry and Forests at http://www.envfor.nic.in This shall be advertised within seven days of the issue of this letter in at least two local newspapers that are widely circulated in the region of which one shall be in the vernacular language of the locality concerned.

xi. The Project Authorities shall inform the Regional Office as well as the Ministry, the date of

financial closure and final approval of the project by the concerned authorities and the date of commencing the land development work.

5. The Ministry may revoke or suspend the clearance, if implementation of any of the above conditions is not satisfactory. 6. The Ministry reserves the right to stipulate additional conditions if found necessary. The Company in a time bound manner will implement these conditions. 7. Any appeal against this environmental clearance shall lie with the National Environment Appellate Authority, if preferred within a period of 30 days as prescribed under Section 11 of the National Environment Appellate Authority Act, 1997. 8. The above conditions will be enforced, inter-alia under the provisions of the Water (Prevention & Control of Pollution) Act, 1974, the Air (Prevention & Control of Pollution) Act, 1981, the Environment (Protection) Act, 1986, Hazardous Wastes (Management & Handling) Rules, 1989, 2003 and the Public Liability Insurance Act, 1991 along with their amendments and rules.

(H.S. Malviya) Joint Director

http://www.envfor.nic.in/

Copy to : 1. The Secretary, Department of Environment, Science & Technology, Assam Secretariat, Government of

Assam, Guwahati- 781 006. 2. Chief Conservator of Forests, Ministry of Environment & Forests, Regional Office (NEZ),Upland

Road, Laitumkhrah, Shillong : 793 003, Meghalaya. 3. The Chairman, Central Pollution Control Board PariveshBhavan, CBD-cum-Office Complex, East

Arjun Nagar, New Delhi - 110 032. 4. The Chairman, Assam State Pollution Control Board, Bamunimaidan, Guwahati- 781 021, Assam. 5. Monitoring Cell, Ministry of Environment and Forests, ParyavaranBhavan, CGO Complex, New Delhi. 6. Guard File. 7. Monitoring File. 8. Record File.

(H.S. Malviya) Joint Director

OIL & NATURAL GAS CORPORATION LTD.

HSE Division, Assam & Assam Arakan BasinCinnamara Complex Jorhat-785704

Phone: 0376-2360033/ DID : 2707 57 6

No. ONGC/A&AAB/HSE/NoC/KHBc(RKH-20H)/201s-16 / l5 7 €To,

The Regional Officer ln charge,Regional Office-GolaghatPollution Control Board, AssamCollege Tiniali, Near Circuit HouseGolaghat-785621

Madam,

Date: 3110812015

Please find enclosed herewith application form, Schedule-l duly filled-in along with fees for obtainingNOC/CTO for exploratory well-KHBC (RKH-2OH) planned for exploration activity in the months ofNovember, 2015. The details are as under'-

Total = Rs. 70,1OO/-(Rupees Seventy Thousand and One Hundred Only)

The NOC and Consent to operate fee of Rs. 70,100/- (Rupees Seventy Thousand & One Hundredonly) is also enclosed herewith vide DD No.633751 dated 18.08.2015 drawn on SBl, in favorofPotlution Contro! Board, Assam payable at Golaghat.Thanking you,

Yours faithfully,

K_J; \.e!>af(Dr. Atul Kumar Samant)DGM (Chem.)

l/c HSE

A&AA Basin, Jorhat.Copy for kind information to:-

1. The Member Secretary, Pollution Control Board Assam, Bamunimaidam, Guwahati- 7810212. EA tO ED-Basin Manager, A&M Basin, ONGC, Jorhat.

Regd. Office: Jeevan Bharti Tower-II, Indira Chowk, Connaught Place, New Delhi- 110 001PABX No. 0l l-23310156,23310157, 23300158 Fax No.0l l-23316413

! ,J'

t_

-L &

st.No

WellName.

Application No. {OC FeeRs)

Consentfee(water)

Consentfee (Air)(Rs)

Applicationfee (Rs)

Total(Rs)

1. KHBC(RKH-

20H)

ONGC/A&AAB/HSE/NOc/KHBC(RKH-2OH)t2015-16

50,000/ 10,000/ 10,000/ 100/ 70,100t

Annexure-2B 1

SCHEDULE-I

Common Application for Consent under Water (Prevention and Control of Pollution) Act, 1974,

Air (Prevention and Control of Pollution) Act, 1981) and authorization under Hazardous Wastes (Management and Handling) Rules, 1989, as amended

No. ONGC/AAAB/HSE/NOC/ KHBC (RWK#20H)/2015-16 Date 28.08.2015 Accompanying form in triplicate to be submitted by the applicant. One copy may be retained by the applicant.

Explanatory note for filling in application form for

Consent / Authorization

(1) Any applicant knowingly giving incorrect information or suppressing any information pertaining to any of the items of the application shall be liable for punishment as per provisions under the relevant Act.

(2) The application form shall be submitted at the head-quarter office of the Board at the address given on the first page of the application form or to the respective Zonal or Regional or Sub-Regional office or District Office of the Board / Pollution Control Committee under whose jurisdiction the applicants’ activity falls.

(3) The application shall be accompanied by the consent fee in the form of Demand Draft No633751 dated 18.08.2015 in favor of Pollution Control Board, Assam State Pollution Control Board / Pollution Control Committee. Fee paid is not refundable.

(4) For the items marked * strike out which is not relevant.

(5) If any of the items is not relevant to the activity of the applicant, please state 'Not Applicable'.

(6) If the space for reply provided for any item is inadequate, use additional sheets, duly referenced.

(7) Item 1: Give the name of the person who is authorized by the applicant to transact their business.

(8) Item 2: Also state the concerned institutions under whose administrative area the unit falls.

(9) The form shall be accompanied by the relevant documents specified on the last page of the application form.

(10) Capital Investment - Consent fee is to be paid based on gross fixed capital investment of the unit without depreciation till the date of application. The gross capital investment shall include cost of "land, building, plant and machinery without depreciation.

Annexure-2B 2

Application form for Consent / Authorisation

No. ONGC/AAAB/HSE/NOC/ KHBC (RWK#20H)/2015-16 Date: 28.08.2015

From

Head HSE Nambar – I Building

ONGC, A & AA Basin, Cinnamara, Jorhat-785704 (Assam)

To

The Member Secretary State Pollution Control Board GUWAHATI, ASSAM Sir,

I / We hereby apply for * (No Objection Certificate)

(i) Consent to Establish/Operate / Renewal of consent under section 25 and 26 of the Water (Prevention and Control of Pollution) Act, 1974, as amended.

(ii) Consent to Establish/Operate / renewal of consent under Section 21 of the

Air (Prevention and Control of Pollution) Act, 1981, as amended.

(iii) Authorization / renewal of authorization under rule 5 of the Hazardous Wastes (Management and Handling) Rules, 1989, as amended in connection with my / our existing / proposed / altered / additional manufacturing processing activity from the premises as per the details given below.

Part A: General

1. Name, designation, office address with telephone, fax numbers, e-mail of the

Applicant/occupier/industry/instituti

on / Local Body

: Dr. Atul Kr. Samant, Dy. General Manager (Chem.) Nambar – I Building ONGC, A & AA Basin, Cinnamara, Jorhat-785704 (Assam) - 0376-2360033,Fax – 0376 –2360014 Mobile-+919435718283

2. (a) Name and location of the industrial Unit / premises for which the application is made. (Give revenue Survey Number/ plot number, name of

: An exploratory well KHBC Khoraghat Extn. ML, Khoraghat. Distt. Golaghat (location map enclosed)

Annexure-2B 3

Taluka and District, also telephone and Fax number)

(b) Details of the planning permission obtained from the local body / Town and Country Planning authority /metropolitan development authority/ designated authority

: Environmental Clearance obtained from MoEF vide letter No J-11011/147/

2008-IA- II(I) dated 24.06.2009.

(c) Name of the local body under whose jurisdiction the unit is located and name of the license issuing authority

:

Divisional Forest Officer, Golaghat Division, Golaghat

3. Names, Addresses with telephone and fax number of Managing Director/ Managing Partner and officer responsible for matters connected with pollution control and / or hazardous waste disposal.

: Head Drilling Services, Drilling In-Charge, Dhansiri Bhavan, A&AA Basin, ONGC, Cinnamara, Jorhat – 785704, - 0376-2361521,Fax – 0376 –2360014

4. (a) Are you registered as a small-scale industrial unit?

: No

(b) If yes, give the number and date of registration.

: N/A

5. Gross capital investment of the unit without depreciation till the date of application (Cost of building, land, plant and machinery). (To be supported by an affidavit, Annual Report or certificate from a Chartered Accountant. For proposed unit(s), give estimated figure)

: Land cost: Nil, The well KHBC to be drilled from drill site KH-4 (KGA) /NR -10 (NRAE).

Site preparation cost: Rs. 93.91 Lakhs (Approx)

6. If the site is located near sea bank / other water bodies; indicate the distance and name of the water body, if any.

: No

Annexure-2B 4

7. Does the location satisfy the requirements under relevant Central / State Govt. notifications such as Coastal Regulation Zone? Notification on Ecologically Fragile Area, Industrial location policy, etc. If so, give details.

: N/A

8. If the site is situated in notified industrial estate,

No

(i) Whether effluent collection, treatment and disposal system has been provided by the authority.

N/A

(ii) Will the applicant utilize the system, if provided

N/A

(iii) If not provided , details of proposed arrangement

N/A

9. Total plot area, built-up area and area available for the use of treated sewage /trade effluent

: Plot area- 130X130 m2 Built-up/ Hardening area -410 m2 Effluent area-2610 m2

10 Month and year of proposed commissioning of the unit

: OCT-NOV, 2015

11 Number of workers and office staff : 81

12. (a) Do you have a residential colony within the premises in respect of which the present application is made?

: No

(b) If yes, please state population staying

: N/A

(c) Indicate its location and distance with reference to plant site

: N/A

13. List of products and by-products manufactures in tons/month, kl/month or numbers/month (Give figure corresponding to maximum installed production capacity)

: N/A (The proposal is to drill well for exploration/exploitation of oil & gas, and not for establishment of any plant for manufacturing products)

Annexure-2B 5

14. List of raw materials and process chemicals with annual consumption corresponding to above stated production figures, in tons/month, kl/month or numbers/month.

: N/A Since, it is not a manufacturing unit, no raw material is used.

15. Description of process of manufacture for each of the products showing input, output, quality and quantity of solid, liquid and gaseous waste if any from each unit process. (To be supported by flow sheet and / or material balance sheet and water balance sheet)

: N/A

Part B Waste Water Aspects 16. Water consumption for different uses

(m3/day)

: Approx. 44.53 m3/day

(i) Industrial cooling, spraying- in mine pits or boiler feeds.

: N/A

(ii) Domestic purpose

: Approx. 1.50 m³/day

(iii) Processing whereby water gets polluted and the pollutants are easily bio-degradable

:

Approx.25.08 m³/day

iv) Processing whereby water gets polluted and the pollutants are not easily bio-degradable and are toxic

: Nil

(v) Others such as agriculture, gardening etc (specify)

: N/A

17. Source of water supply. Name of

authority granting permission if applicable and quantity permitted

: Bore well/or through water tankers

18. Quantity of waste water (effluent) generated (cu.m/day)


(i) Domestic

: 0.250 m³/day

Annexure-2B 6

(ii) Industrial :

N/A

(iii)

Process

:

35.25 m³/day

(iv)

Washings

:

0.60 m³/day

(v)

Boiler Blow down

:

Nil

vi) Cooling water blowdown

: Nil

vii) DM Plant/Softening Plant washings : Nil 19. Water budget calculations accounting

for difference between water consumption and effluent generated


20. Present treatment of sewage/canteen effluent (Give sizes/capacities of treatment unit)

: Septic Tanks are constructed at site.

21. Present treatment of trade effluent (Give sizes / capacities of treatment units) (A schematic diagram of the treatment scheme with inlet / outlet characteristics of each unit operation /process is to be provided. Include details of residue management system (ETP sledges).

: Waste water is collected in impervious lined waste pit and treated by a Mobile ETP. The treated water is recycled and re-used. Size:- 13’7”(L)x 7’(W) x 8’3”(H) Capacity of ETP:-125 m3/day

22 (a) Are sewage and trade effluents

mixed together?

: No

(b) If yes. State which stage – whether before, intermittently or after treatment.

: N/A

23. Capacity of treated effluent sump. Guard pond, if any.

: The treated effluent will be reused for preparation of mud & technical

purpose. 24. Mode of disposal of treated effluent,

with respective quantity, cum/day.

: Recycled and reused. Remaining disposed of by evaporation

(i) Into stream/river (name of river) : Nil

Annexure-2B 7

(ii) Into creek/estuary

(name of creek/estuary)

: Nil

(iii) Into sea

: Nil

(iv) Into drain / sewer (owner of sewer)

: Nil

(v) On land for irrigation on owned land / lease land. Specify cropped area. (To be supported by relevant documents)

: Nil

(vi) Quantity of treated effluent reused/recycled cu.m/day. Provide a location map of disposal arrangement indicating the outlet(s) for sampling.

: Mobile ETP is located at site. The treated water is recycled and reused for all technical purposes. Out let for sampling is provided.

(vii) Provide a location map of disposal arrangement indicating the outlet(s) for sampling.

: N/A

25. (a) Quality of untreated/ treated effluents (Specify pH and concentration of SS, BOD, COD and specific pollutants relevant to the industry. TDS to be reported for disposal on land or into stream / river).

: Effluent quality (treated) PH – 7.10 SS – 25.00 mg/L BOD-26.00 mg/L COD-85.44 mg/L TDS – 300.00 mg/L

(b) Enclose a copy of the latest report of analysis from the laboratory approved by State Board / Committee / Central Board / Central Government in the Ministry of Environment and Forests. For proposed unit furnish expected characteristics of the untreated / treated effluent.

:

Enclosed the latest Analysis Report from the Regional laboratory of Pollution Control Board, Assam, Bamunimaidam, Guwahati-21.

Annexure-2B 8

Part – C: Air emission aspects 26. Fuel consumption: Coal LSHS Furnace

Oil Natural Gas

Others (HSD)

a. Fuel consumption (TPD/KLD)

Nil Nil Nil Nil 5.0 KLD

b. Calorific value - - - - - c. Ash content % - - - - - d. Sulphur content % - - - - - e. Other (specify) - - - - - 27. (A) Details of stack (process & fuel stacks):

: 1 2 3 4 a. Engine Numbers/ Stack

number (s) 25344959

25325976 25344957 25344958

(stand by)

b. Attached to Engine for power generation

c. Capacity : Full load power 1180 HP @1500 RPM d. Fuel Type : HSD e. Fuel quantity (TPD/KLD) : Fuel consumption at 80% load 216 lits/hr,(approx)

Specific fuel consumption 152gms/BHP-Hr f. Material of construction : Cylinder Block-Cast alloyed gray iron Fly wheel-C.I

Crank-Shaft-Forged Steel g. Shape (round/ rectangle) : All are Rectangle.

V Type Engine with circular exhaust outlet h. Height, m (above ground

level) : ENGINE HEIGHT 2000MM

i. Diameter / size, in meters

: Engine Dimensions (2875X1505X2000) MM

j. Gas quantity, Nm3 / hr. : k. Gas temperature, °C : Exhaust Gas Temperature, 400 to 750 Deg. C l. Exit Gas velocity, m/sec : Pr of burning gas – 14 T/Sq in Equivalent to 70

Bar/Sq in.@ 60-70% peak Pr. m. Control equipment

preceding the stack : Muffler

(Attach specifications including residue management systems of each of the control equipment indicating inlet/outlet concentrations of relevant pollutants)

: Metal sheet–Standard size–6.0 MM (Thick) – 4 Nos Metal Sheet – 10.0 MM (Thick) – 1 No Elbow – 8” – 2 Nos Nuts Bolts with washer – 24 Nos Eye Bolts: 3” ID with nut & Washer – 24 Nos

mailto:power1010h.p@1000

Annexure-2B 9

27

(B) Whether any release of odoriferous compounds such as Mercaptans, Phorate etc. are coming out

:

No

28. Do you have adequate facility for collection of samples of emissions in the form of port poles, platform, ladder etc. as per Central Board Publication “Emission Regulations Part-III” December 1985.

: Yes / Ambient air quality is monitored. The emission is to be analyzed for standard parameters and HC.

29. Quality of treated flue gas emissions and process emissions. (Specify concentration of criteria pollutants and industry / process- specific pollutants stack-wise. Enclose a copy of the latest report of analysis from the approved laboratory by State Board / Central Board / Central Government in the Ministry of Environment and Forests. For proposed units furnish the expected characteristics of the emission.

: Not any emission of any flue gases in the drilling process.

Part-D: Hazardous waste aspects: At source, any hazardous or Toxic Chemicals are not used. 30 (a)Whether the unit is generating

hazardous waste as defined in the Hazardous Waste (Management and handling) Rules, 1989, as amended.

: No (But, used/spent oil is taken out from the Engines at the time of servicing only, about 100-200 L)

(b) If so, the category No.

: 5.1

31. Authorization required for*

N/A

(i) Collection

: No

(ii)

Reception : No

Annexure-2B 10

(iii) Treatment

: No

(iv) Transport

: No

(v) Storage

: No

(vi) Disposal of the hazardous waste : Reused & Recycled. 32. Quantity of hazardous waste

generated (kg/day) or (mt/month) : 100 to 150 (approx.) litre/month

33. Characteristics of the hazardous

waste(s). Specific concentration of relevant pollutants. Enclose a copy of the latest report of analysis from the laboratory approved by State Board / Central Board / Central Government in the Ministry of Environment and Forests. For proposed units furnish expected characteristics.

: Used oil

34. Mode of storage (intermediate or final) (describe area, location and methodology)

: Drums

35. Present treatment of hazardous waste, if any (give type and capacity of treatment units)

: Nil

36. Quantity of hazardous waste disposed.

Nil

(i) Within the factory

: N/A

(ii) Outside the factory (specify location and enclose copies of agreement)

: N/A

(iii) Through sale (Enclose documentary proof and copies of agreement)

: N/A N/A N/A

(iv) Outside state / Union territory, if yes particulars of (i) & (ii) above

: N/A

(v) Other (specify) : N/A

Annexure-2B 11

Part-E: Additional Information 37. (a) Do you have any proposals to

upgrade the present system for treatment and disposal of effluent/emission and /or hazardous waste.

: No

(b) If yes, give the details with time schedule for the implementation and approximate expenditure to be incurred on it.

: N/A

38. Capital and recurring (O & M) expenditure on various aspects of environment protection such as effluent, emission, hazardous waste, solid waste, tree plantation, monitoring, date acquisition etc. (give figures separately for items implemented / to be implemented).

: i) Expenditure on Environmental protection, restoration of land and tree plantation etc. is more than 25 lakhs / well.

ii) Liquid waste and solid waste management and Air quality monitoring as per APCB guideline. Testing of drilled cuttings & mud at every well is planned. (Approx. Rs. 4 to 5 lakhs/well for testing only).

39. To which of the pollution control equipment, separate meters for recording consumption of electric energy are installed?

: None

40. Which of the pollution control items are connected to D.G set (captive power source) to ensue their running in the event of normal power failure?

: N/A

41. Nature, quantity and method of disposal of non-hazardous solid waste generated separately from the process of manufacture and waste treatment. (Give details of area/ capacity available in applicants land).

: Solid waste (Inert rock cuttings) generated during drilling are washed, collected in a lined impervious waste pit on site. No hazardous chemicals are being

used in water base mud. Waste pit shall be covered again with HDPE liner prior to leave the location. Restoration of land as per MOEF guideline. Quantity – 250 to 300 MT/ well (approx)

42. Hazardous chemicals – give details of chemicals and quantities handled and stored.

: Nil

Annexure-2B 12

i. Is the unit a major accident hazard unit as per MSIHC rules?

: N/A

ii. Is the unit an isolated storage as defined under the MSIHC rules?

: N/A

iii. Indicate status of compliance of rules 5, 7, 10, 11, 12, 13 and 18 of the MSIHC rules.

: N/A

iv. Has approval of site has been obtained from the concerned authority?

: N/A

v. Has the unit prepared an offsite emergency plan? Is it updated?

: N/A

vi.

Has information on imports of chemicals been provided to the concerned authority?

:

N/A

vii. Does the unit posses a policy under the PLI act?

: yes

43. Brief details of tree plantation/green belt development within applicant’s premises (in hectares).

: Trees are planted in available open space and around site.

44 Information of schemes for waste minimization, resource recovery and recycling-implemented and to be implemented, separately.

: Mobile ETP will be used to treat drilling waste water for reuse/recycle as technical water.

45 (a) The applicant shall indicate whether industry comes under Public Hearing, if so, the relevant documents such as EIA, EMP, Risk Analysis etc. shall be enclosed shall be indicated accordingly.

(b)Any other additional information that the applicant desires to give.

: As per EIA Notification 2006, environmental clearance is obtained from MoEF vide letter No J-11011/147/

2008-IA- II(I) dated 24.06.2009.

Nil

Annexure-2B 13

46. I/We further declare that the information furnished above is correct to the best of my/our knowledge. 47. I / We hereby submit that in case of any change from what is stated in this application in respect of raw materials, products, process of manufacture and treatment and /or disposal of effluent, emissions, hazardous wastes etc. in quality and quantity; a fresh application for Consent / Authorization shall be made and until the grant to fresh Consent/ Authorization no change shall be made 48. I / We undertake to furnish any other information within one month of its being called by the Board/committee. 49. I / We agree to submit to the Board an application for renewal of consent /authorization in two months in advance before the date of expiry of the consent / authorization validity period. 50. I / We enclose herewith a Demand draft of Rs.70,100/- (Rupees Seventy thousand one hundred only) bearing No.633751 dated 18.08.2015 drawn on SBI, Golaghat main Branch & payable in favour of Pollution Control Board, Assam , as the fee for consents & authorization for a period up to completion of said oil well.

Yours faithfully,

(Dr.Atul Kumar Samant)

DGM (Chem.)-Head HSE Nambar-1 Building

ONGC, A & AA Basin Cinnamara, Jorhat-785704 Documents enclosed:-

1. Environmental clearance obtained from MOEF vide letter No J-11011/147/ 2008-IA II (I) dated 24.06.2009.

2. Location Map 3. Demand Draft No.633751 dated 18.08.2015, drawn on SBI, Main Br., Golaghat in favor of Pollution Control Board, Assam, & payable at Golaghat. 4. Effluent Analysis Report by regional laboratory of PCB: Assam, Bamunimaidam, Guwahati-21.

Annexure-1

SIX MONTHLY COMPLIANCE REPORT FOR ENVIRONMENT CLEARANCE

(As on 1stJune 2014)

1 Name of the project:-

Exploratory Drilling for Oil & Gas at South Assam Shelf Block Areas, District: - Golaghat. Well No: KHAY

2 Location of project/ address:-

Dist:Golaghat

3 Letter No. & date of Environment Clearance granted by MOEF:-

F.NO. J-11011/147/2008-IA-II(I), Dated:24.06.2009

4 Present Status of project:-

Oil indication in well , Rig released on 25.04.14 well closed

A. SPECIFIC CONDITIONS

SN

Specific Condition Remarks

i. Compensation for the land acquisition to the land

oustees and for standing crop shall be paid as per the

prevailing rules.

The action has been taken as

per norms of State

Government

ii. The company shall obtain forest clearance under

Forest Conservation Act 1980 for the sites located

within the forest area.

Forest clearance is taken

wherever necessary.

iii. The company shall obtain permission to establish

under Air and Water Acts from the SPCB for each

well and copy submitted to Ministry’s Regional Office

at Shillong.

Complied

iv. The company shall inform the details of the each drill

sites to Ministry’s Regional Office at shillong.

Complied

v. The company shall make the arrangements for control

of noise from the drilling activity and from DG sets.

DG sets are provided acoustic

enclosures. More over ear

muffs and ear plugs are

provided for the employees

working near the DG sets

SN


vi. The company shall comply with the guidelines of

Disposal of solid waste, drill cutting and drilling fluids

for onshore drilling operation vide GSR.546 (E) dated

30 August 2005.


per norms of MoEF.

vii. The surface facilities shall be installed as per

applicable codes and standards, international practice

and applicable local regulations

All the surface facilities

installed were as per API

standards international safety

and environment practices are

being followed. In addition to

that OMR, DGMS, MoEF,

CPCB, and PCBA regulations

and guidelines are being

followed.

viii. The top soil removed shall be stacked separately for

reuse during restoration process.

The top soil stacked and kept

for future restoration process.

ix. Drilling waste water including drill cuttings wash water

shall be collected in disposal pit lined with HDPE

lining evaporated or treated and shall comply with the

notified standards for onshore disposal. The

membership of common TSDF shall be obtained for

the disposal of drill cuttings and hazardous waste.

Otherwise secured landfill shall be created at the site

with authorization of the SPCB. The design of the

secured landfill shall be approved by SPCB.

Complied with.

x. The company shall construct the garland drain all

around the drilling site to prevent runoff any oil

containing waste in to the nearby water bodies.

Complied.

xi. The recyclable waste (oily sludge) and spent oil shall

be disposed to authorized recyclers.

No oily sludge is generated,

but spent oil is collected,

transported to DTY for

disposal as per HWMH

RULES 1989.

xii. Only water based mud drilling mud shall be used. The

drilling mud shall be recycled. In case of use of

synthetic mud due to any problem geological

formation for drilling, low toxicity, oil Based mud

(OBM) having aromatic content<1% shall be used. If it

is intended to use such OBM/SBM to mitigate specific

hole problem, it should be intimated to Ministry of

Environment and Forest/SPCB.

Yes only water based mud

used during drilling the well.

The drilling mud is recycled.

SN


xiii. Quantities of storage of chemicals and additives

required for drilling mud preparation shall be below

the specified threshold permitted under MSIHC Rules.

Yes condition being followed.

The storage of chemical /

additives used for drilling mud

preparation is well below the

threshold storage limit.

xiv. Pre hire inspection, safety meetings, tool box meeting

and audits to identify hidden/potential hazardous.

OMR, OISD and RCP

guidelines are followed for

safety of equipment’s and

employees. The safety audits

and safety meetings are

carried out regularly for

avoiding hazards.

xv. The company shall take Necessary measures to

prevent fire hazards, containing oil spill and soil

remediation as needed. At place of ground flaring, the

overhead flaring stack with knockout drums shall be

installed to minimize gaseous emissions during

flaring.

Yes conditions werecompiled

with. All necessary measures

to prevent fire are being taken.

xvi. The company shall take necessary measures to

reduce noise level s at D/S by providing mitigation

measures such as proper acoustic enclosures to DG

set and meet norms notified by MOEF. Height of all

stacks/ vents shall be as per CPCB guidelines.

Safety necessary measures

being taken as per MoEF

guidelines.

xvii. To prevent fire and explosion, potential ignition source

should be kept to a minimum and adequate distance

between potential ignition sources and flammable

material should be in place.

For implementing safe

distances to prevent fire and

explosion from potential

ignition source OMR, OISD

and RCP guidelines are strictly

followed.

xviii. The company shall develop contingency plan for H2S

release, all necessary aspects from evacuation to

resumption of normal operations. The workers should

be provided with personal H2S detectors in locations

of high risk of exposure along with self-containing

breathing apparatus.

The location is not H2S prone

area, however contingency plan

for H2S is available at site.

SN


xix. To prevent well blowout during operation Blow out

Preventer (BOP) system shall be installed. Focus on

maintaining well bore hydrostatic pressure by proper

pre well planning, drilling fluid, logging etc.

BOP installed and maintained

as per OMR, OISD guidelines.

Hydrostatic head was

maintained as per GTO.

xx. The company shall take measure after completion of

drilling process by well plugging and secured

enclosures, decommissioning of rig upon

abandonment of well, the D/S shall be restored to

near original condition. In the event that no economic

quantity of HC is found a full abandonment plan shall

be implemented for site as per Indian Petroleum

Regulations.

Yes, being followed as per the

instructions.

xxi. Occupational health surveillance of the workers shall

be carried out as per prevailing the prevailing Acts

and Rules.

PME being done at regular

interval.

xxii. In case the commercial viability of the project is

established, the company shall prepare detailed plan

for development of oil & gas fields and obtain fresh

clearance from Ministry.

Drilling under process.

xxiii. The company shall provide housing for construction

labour within the site with all necessary infrastructures

and facilities such as fuel for cooking , mobile toilets,

mobile STP, safe drinking water , medical health care

, crèche etc. the housing may be in the form of

temporary structures to be removed after the

completion of the project.

DSA with all infrastructures and facilities such as fuel for cooking, mobile toilets, mobile STP, safe drinking water, medical health care, is available which is near to drill site.

B. GENERAL CONDITIONS

S. No.

General Conditions Remarks

i The project authorities must strictly

adhere to stipulations made by State

Pollution Control Board and the State

Government.

Followed as per the Guidelines provided

by State Pollution Control Board and the

State Government.

ii No further expansion or modification of

project shall be carried without prior

approval of MOEF. In case of deviation

or alteration in the project proposal from

those submitted to this ministry for

clearance, a fresh reference shall be

made to Ministry to access the

adequacy of conditions imposed and to

add additional environmental protection

measures required if any.

Shall be complied if any

iii The emissions of (RSPM, SPM, SO2,

NOx, HC& HOC) from DG set and flare

stack shall conform the standards of

SPCB. Regular monitoring of ambient

air for HC and VOC as per CPCB

guidelines. Stack height attached to DG

sets shall be as per EPA and rules.

Is strictly followed as per EPA and rules.

iv The project authorities must strictly

Comply with rules and regulations

under Manufacture, Storage and Import

of Hazardous Chemicals Rules

1989.Prior approval from Chief

Inspectorate of Factories, Chief

Controller of Explosive, Fire Safety

Inspectorate etc must be obtained,

wherever applicable.

Is strictly followed

No hazardous chemicals (as listed) are

being used however APCB will be

approached with list for authorisation as

per MoEF guidelines.

S. No.


v The project authorities must strictly

Comply with rules and regulations with

regard to handling and disposal of

Hazardous Wastes (Management and

handling) rules 1989/2003 wherever

applicable. Authorisation from SPCB

must be obtained for collections/

treatment/storage/ disposal of

hazardous wastes.

Complied.

Authorisation from SPCB obtained.

vi The overall noise levels in and around

the plant shall be kept within the

standards by providing noise control

measure including acoustic hoods,

silencers, enclosures etc. on all sources

of noise generation. The ambient noise

levels shall conform to EPA rules, 1989

viz 75 dBA (daytime) and 70 dBA (night

time).

Is strictly followed and conform to EPA

rules, 1989.

vii. A separate Environmental Management

Cell equipped with full fledge laboratory

facilities to carry out environment

management and monitoring functions.

A separate HSE section exists that

monitor the environmental performance

of the project. Our regional laboratory is

well equipped with most of such facilities.

viii The project authorities shall provide

adequate funds both recurring and non-

recurring to implement the conditions

stipulated by MOEF and State Govt.

along with implementation schedule for

all the conditions stipulated herein. The

funds so provided shall not be diverted

for any other purpose.

Adequate Budgetary Provision exists.

The allocated budget shall not be

diverted for any other purpose.

ix The Regional Office of this

Ministry/Central Pollution Control Board

will monitor the stipulated condition.

A six monthly compliance and the

monitored data along with statistical

interpretation to be submitted to them

regularly.

Complied.

S. No.


x The project proponent shall inform the

public that the project has accorded

environmental clearances and copies of

clearances letters are available with the

State Pollution Control Board and also

be seen at Web site of the Ministry of

Forests at http://www.envfor.nic.in.This

shall be advertise within seven days of

the issue of this letter in at least two

local newspapers that are widely

circulated in the region of which one

shall be in the vernacular language of

the locality concerned..

Complied.

xi. The project authority shall inform the

RO as well as the Ministry, the date of

financial closure and final approval of

project by the concerned authorities

and date of commencing of land

development work.

Shall be informed.

xii The above conditions will be enforced,

inter-alia under provision of Water

(Prevention & Control of Pollution) Act

1974, Air(Prevention & Control of

Pollution) Act 1981, Environment

(Protection) Act 1986, Hazardous

Waste Rules 1989, 2003 and Public

Liability Insurance Act 1991 along with

their amendments and rules.

Being followed.

Annexure-2

SIX MONTHLY COMPLIANCE REPORT FOR ENVIRONMENT CLEARANCE

(As on 1stJune 2014)

1 Name of the project:-

Exploratory Drilling for Oil & Gas at South Assam Shelf Block Areas, District: - Golaghat. Well No: KHAS


Dist: Golaghat


F.NO. J-11011/147/2008-IA-II(I), Dated:24.06.2009


Well Spudded on 11thApril 2014 Drilling in progress


SN


i. Compensation for the land acquisition to the land

oustees and for standing crop shall be paid as per the

prevailing rules.


per norms of State

Government

ii. The company shall obtain forest clearance under

Forest Conservation Act 1980 for the sites located

within the forest area.

Forest clearance is taken

wherever necessary.

iii. The company shall obtain permission to establish

under Air and Water Acts from the SPCB for each

well and copy submitted to Ministry’s Regional Office

at Shillong.

Complied

iv. The company shall inform the details of the each drill

sites to Ministry’s Regional Office at shillong.

Complied

v. The company shall make the arrangements for control

of noise from the drilling activity and from DG sets.

DG sets are provided acoustic

enclosures. More over ear

muffs and ear plugs are

provided for the employees

working near the DG sets

SN


vi. The company shall comply with the guidelines of

Disposal of solid waste, drill cutting and drilling fluids

for onshore drilling operation vide GSR.546 (E) dated

30 August 2005.


per norms of MoEF.

vii. The surface facilities shall be installed as per

applicable codes and standards, international practice

and applicable local regulations

All the surface facilities

installed were as per API

standards international safety

and environment practices are

being followed. In addition to

that OMR, DGMS, MoEF,

CPCB, and PCBA regulations

and guidelines are being

followed.

viii. The top soil removed shall be stacked separately for

reuse during restoration process.

The top soil stacked and kept

for future restoration process.

ix. Drilling waste water including drill cuttings wash water

shall be collected in disposal pit lined with HDPE

lining evaporated or treated and shall comply with the

notified standards for onshore disposal. The

membership of common TSDF shall be obtained for

the disposal of drill cuttings and hazardous waste.

Otherwise secured landfill shall be created at the site

with authorization of the SPCB. The design of the

secured landfill shall be approved by SPCB.

Complied with.

x. The company shall construct the garland drain all

around the drilling site to prevent runoff any oil

containing waste in to the nearby water bodies.

Complied.

xi. The recyclable waste (oily sludge) and spent oil shall

be disposed to authorized recyclers.

No oily sludge is generated,

but spent oil is collected,

transported to DTY for

disposal as per HWMH

RULES 1989.

xii. Only water based mud drilling mud shall be used. The

drilling mud shall be recycled. In case of use of

synthetic mud due to any problem geological

formation for drilling, low toxicity, oil Based mud

(OBM) having aromatic content<1% shall be used. If it

is intended to use such OBM/SBM to mitigate specific

hole problem, it should be intimated to Ministry of

Environment and Forest/SPCB.

Yes only water based mud

used during drilling the well.

The drilling mud is recycled.

SN


xiii. Quantities of storage of chemicals and additives

required for drilling mud preparation shall be below

the specified threshold permitted under MSIHC Rules.

Yes condition being followed.

The storage of chemical /

additives used for drilling mud

preparation is well below the

threshold storage limit.

xiv. Pre hire inspection, safety meetings, tool box meeting

and audits to identify hidden/potential hazardous.

OMR, OISD and RCP

guidelines are followed for

safety of equipment’s and

employees. The safety audits

and safety meetings are

carried out regularly for

avoiding hazards.

xv. The company shall take Necessary measures to

prevent fire hazards, containing oil spill and soil

remediation as needed. At place of ground flaring, the

overhead flaring stack with knockout drums shall be

installed to minimize gaseous emissions during

flaring.

Yes conditions werecompiled

with. All necessary measures

to prevent fire are being taken.

xvi. The company shall take necessary measures to

reduce noise level s at D/S by providing mitigation

measures such as proper acoustic enclosures to DG

set and meet norms notified by MOEF. Height of all

stacks/ vents shall be as per CPCB guidelines.

Safety necessary measures

being taken as per MoEF

guidelines.

xvii. To prevent fire and explosion, potential ignition source

should be kept to a minimum and adequate distance

between potential ignition sources and flammable

material should be in place.

For implementing safe

distances to prevent fire and

explosion from potential

ignition source OMR, OISD

and RCP guidelines are strictly

followed.

xviii. The company shall develop contingency plan for H2S

release, all necessary aspects from evacuation to

resumption of normal operations. The workers should

be provided with personal H2S detectors in locations

of high risk of exposure along with self-containing

breathing apparatus.

The location is not H2S prone

area, however contingency

plan for H2S is available at

site.

SN


xix. To prevent well blowout during operation Blow out

Preventer (BOP) system shall be installed. Focus on

maintaining well bore hydrostatic pressure by proper

pre well planning, drilling fluid, logging etc.

BOP installed and maintained

as per OMR, OISD guidelines.

Hydrostatic head was


xx. The company shall take measure after completion of

drilling process by well plugging and secured

enclosures, decommissioning of rig upon

abandonment of well, the D/S shall be restored to

near original condition. In the event that no economic

quantity of HC is found a full abandonment plan shall

be implemented for site as per Indian Petroleum

Regulations.

Yes, being followed as per the

instructions.

xxi. Occupational health surveillance of the workers shall

be carried out as per prevailing the prevailing Acts

and Rules.

PME being done at regular

interval.

xxii. In case the commercial viability of the project is

established, the company shall prepare detailed plan

for development of oil & gas fields and obtain fresh

clearance from Ministry.

Drilling under progress.

xxiii. The company shall provide housing for construction

labour within the site with all necessary infrastructures

and facilities such as fuel for cooking , mobile toilets,

mobile STP, safe drinking water , medical health care

, crèche etc. the housing may be in the form of

temporary structures to be removed after the

completion of the project.

DSA with all infrastructures and facilities such as fuel for cooking, mobile toilets, mobile STP, safe drinking water, medical health care, is available which is near to drill site.

B. GENERAL CONDITIONS

S. No.


i The project authorities must strictly

adhere to stipulations made by State

Pollution Control Board and the State

Government.

Followed as per the Guidelines provided

by State Pollution Control Board and the

State Government.

ii No further expansion or modification of

project shall be carried without prior

approval of MOEF. In case of deviation

or alteration in the project proposal from

those submitted to this ministry for

clearance, a fresh reference shall be

made to Ministry to access the

adequacy of conditions imposed and to

add additional environmental protection

measures required if any.

Shall be complied if any

iii The emissions of (RSPM, SPM, SO2,

NOx, HC& HOC) from DG set and flare

stack shall conform the standards of

SPCB. Regular monitoring of ambient

air for HC and VOC as per CPCB

guidelines. Stack height attached to DG

sets shall be as per EPA and rules.

Is strictly followed as per EPA and rules.

iv The project authorities must strictly

Comply with rules and regulations

under Manufacture, Storage and Import

of Hazardous Chemicals Rules

1989.Prior approval from Chief

Inspectorate of Factories, Chief

Controller of Explosive, Fire Safety

Inspectorate etc must be obtained,

wherever applicable.

Is strictly followed

No hazardous chemicals (as listed) are

being used however APCB will be

approached with list for authorisation as

per MoEF guidelines.

S. No.


v The project authorities must strictly

Comply with rules and regulations with

regard to handling and disposal of

Hazardous Wastes (Management and

handling) rules 1989/2003 wherever

applicable. Authorisation from SPCB

must be obtained for collections/

treatment/storage/ disposal of

hazardous wastes.

Complied.

Authorisation from SPCB obtained.

vi The overall noise levels in and around

the plant shall be kept within the

standards by providing noise control

measure including acoustic hoods,

silencers, enclosures etc. on all sources

of noise generation. The ambient noise

levels shall conform to EPA rules, 1989

viz 75 dBA (daytime) and 70 dBA (night

time).

Is strictly followed and conform to EPA

rules, 1989.

vii. A separate Environmental Management

Cell equipped with full fledge laboratory

facilities to carry out environment

management and monitoring functions.

A separate HSE section exists that

monitor the environmental performance

of the project. Our regional laboratory is

well equipped with most of such facilities.

viii The project authorities shall provide

adequate funds both recurring and non-

recurring to implement the conditions

stipulated by MOEF and State Govt.

along with implementation schedule for

all the conditions stipulated herein. The

funds so provided shall not be diverted

for any other purpose.

Adequate Budgetary Provision exists.

The allocated budget shall not be

diverted for any other purpose.

ix The Regional Office of this

Ministry/Central Pollution Control Board

will monitor the stipulated condition.

A six monthly compliance and the

monitored data along with statistical

interpretation to be submitted to them

regularly.

Complied.

S. No.


x The project proponent shall inform the

public that the project has accorded

environmental clearances and copies of

clearances letters are available with the

State Pollution Control Board and also

be seen at Web site of the Ministry of

Forests at http://www.envfor.nic.in.This

shall be advertise within seven days of

the issue of this letter in at least two

local newspapers that are widely

circulated in the region of which one

shall be in the vernacular language of

the locality concerned..

Complied.

xi. The project authority shall inform the

RO as well as the Ministry, the date of

financial closure and final approval of

project by the concerned authorities

and date of commencing of land

development work.

Shall be informed.

xii The above conditions will be enforced,

inter-alia under provision of Water

(Prevention & Control of Pollution) Act

1974, Air(Prevention & Control of

Pollution) Act 1981, Environment

(Protection) Act 1986, Hazardous

Waste Rules 1989, 2003 and Public

Liability Insurance Act 1991 along with

their amendments and rules.

Being followed.

,!

OIL & NATURAL GAS CORPORATION LTD.Assam & Assam Arakan Basin, HSE Section

Cinnamara Complex Jorhat-785704Fax:0376-2360014 Phone: 0376-2360033 .

No. A&AAB/HSE/ Six Mon. Comp. ReporU2015-16 I q4V Date:12.06.2015

To:

1. The Director, (lA)MoEF&CC,lndira Paryavaran Bhavan,Jorbagh RoadNew Delhi-110003

2. Chief Conservator of Forests,Kind attention: Dr H.TYNSONG (Scientist-C)Ministry of Environment and Forest, NE Regional office, LAW-U-SIB, LUMBATINGEN,NEAR MTC workshop, Shillong -7 9302t

Sub: Six Monthly Compliance Reporton Exploratory Drilling (as on 1"t of June,2015) in respectof A & AA Basin, ONGC, Jorhat.

Sir,

Please find enclosd herepith "Six Monthly Compliance Report" on environmental clearance stipulationsfor projects on Exploratory Drilling in South Assam Shelf Block, A&AA Basin, ONGC, . Jorhat, Assam. Thereports cover the compliance status as on 1"t June,20'15.

- Thanking You,U

(*^l*+6rt,;Yours faithfully,Pradeep Kumar

DGM (D),Head-HSE

Copy to: For kind information pl.

1. ED- Basin Manager, ONGC, A & AA Basin, Cinnamara Qomplex, Jorhat.2. GM- Block Manager, SAS Block, ONGC, A & AA Basin, Cinnambra Complex3. Office Copy

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SIX MONTHLY COMPLIANCE REPORT FOR ENVIRONMENT CLEARANCE (As on 1st JUNE’ 2015)

1

Name of the project:-

Exploratory Drilling for Oil & Gas at South Assam Shelf in Nambar & Khoraghat Areas, District: - Golaghat. Well: KHBA, KHAS, KHAZ &MGAA


Golaghat Revenue Circle, District: - Golaghat.


J-11011/147/2008-IA-II(I) dated 24.06.2009


KHBA- Competed as gas well. Closed. No production KHAS- Temporarily Abandoned KHAZ-Temporarily Abandoned MGAA-Under drilling.


Sl. No.


i. Compensation for the land acquisition to the land oustees (if any) and for standing crop shall be paid as per the National Resettlement and Rehabilitation Policy (NRRP) 2007/State Government norms. It may be ensure that compensation provided shall not be less than the norms of the NRRP 2007.

The action has been taken as per norms of

State Government

ii. The company shall obtain forest clearance under Forests Conservation Act 1980 for the sites located within the forest area.

Will obtain forest clearance wherever

applicable.

iii. The company shall obtain permission to establish under Air and water acts from State \pollution Control \board for each well and copy submitted to Ministry’s Regional Office at Shillong.

Complied

iv. The company shall inform the details of the each drill site to Ministry’s Regional Office at Shillong.

KHBA-Spud: 27.10.2014, HT: 17.12.2014 Competed as gas well. Closed. No production KHAS- Spud:11.04.2014, HT: 09.07.2014 Temporarily Abandoned. KHAZ-Spud: 14.07.2014, HT: 07.11.2014 Hermetically tested. Marked for testing. MGAA-Spud: 05.05.2015,Under drilling.

v. The company shall make the arrangement for control of noise from the drilling activity and from DG sets.

All DG sets are provided with acoustic

enclosures. Moreover ear muffs and ear plugs

are provided for the employees working near

the DG sets.

Sl. No.


vi. The company shall comply with the guidelines of disposal of solid waste; drill cutting and drilling fluids for onshore drilling operation vide GSR.546 (E) dated 30 August 2005

Provisions for disposal pits with impervious

lining for drill cuttings and waste water under

applicable norms of MoEF made at drill sites.

vii. The surface facilities shall be installed as per applicable codes and standards, international practice and applicable local regulations.

All the surface facilities installed were as per

API standards stipulated for safety and

environment practices are being followed. In

addition to that OMR, DGMS, MoEF, CPCB,

and PCBA regulations and guidelines are

being followed.

viii. The top soil removed shall be stacked separately for reuse during restoration process.

The top soil stacked will be used for the

restoration process.

ix. Drilling waste water including drill cuttings wash water shall be collected in disposal pit lined with HDPE lining evaporated or treated and shall comply with the notified standards for onshore disposal. The membership of common TSDF shall be obtained for the disposal of drill cuttings and hazardous waste. Otherwise secured landfill shall be created at the site as per the design of the secured shall be approved by the CPCB and obtain the authorization of the SPCB. The design of the secured landfill shall be approved by SPCB.

Waste water and drill cuttings are collected in

the impervious lined pit.

Mobile ETP deployed for recycling of waste

water.

Secured landfill will be carried out when

required.

x. The company shall construct the garland drain all around the drilling site to prevent runoff of any oil containing waste in to the nearby water bodies.

Complied with.

xi. The recyclable waste (oily sludge) and spent oil shall be disposed of to authorized recyclers

No oily sludge is generated, but spent oil is

collected, transported to DTY for disposal as

per HWMH RULES 1989.

xii. Only water based drilling mud shall be used. The drilling mud shall be recycled. In case of use of synthetic mud due to any problem geological formation for drilling, low toxicity, oil Based mud (OBM) having aromatic content <1% shall be used. If it is intended to use such OBM/SBM to mitigate specific hole problem, it should be intimated to Ministry of Environment and Forest/SPCB.

Yes, only water based mud is being used

during drilling the well. The drilling mud is

recycled.

Complied.

Sl. No.


xiii. Quantities of storage of chemicals and additives used for preparation of mud below the specified threshold permitted under MSIHC Rules.

The chemicals used for mud are not covered

under MSIHC Rules as non hazardous&non

toxic chemicals are used in water base mud

xiv. Pre hire inspection, safety meetings, tool box meeting and audits to identify hidden/potential hazardous.

OMR, OISD and SOPs are followed for safety

of equipment’s and employees. Inspections,

safety audits and safety meetings are carried

out regularly for avoiding hazards.

xv. The company shall take necessary measures to prevent fire hazards, containing oil spill and soil remediation as needed. At place of ground flaring, the overhead flaring stack with knockout drums shall be installed to minimize gaseous emissions during flaring.

Compiled.

All necessary measures are taken to prevent

fire, oil spill and to keep gaseous emissions to

minimum. Soil Bioremediation is done as and

when required.

xvi. The company shall take necessary measures to reduce noise levels at D/S by providing mitigation measures such as proper acoustic enclosures to DG set and meet norms notified by MOEF. Height of all stacks/ vents shall be as per CPCB guidelines.

Required Safety measures are being followed

as per MoEF& CPCB guidelines.

xvii. To prevent fire and explosion at Oil & Gas facility, potential ignition source should be kept to a minimum and adequate distance between potential ignition sources and flammable material should be in place.

For implementing safe distances to prevent

fire and explosion from potential ignition

source OMR, OISD and RCP guidelines were

strictly followed.

xviii. The company shall develop contingency plan for H2S release, all necessary aspects from evacuation to resumption of normal operations. The workers should be provided with personal H2S detectors in locations of high risk of exposure along with self containing breathing apparatus.

This is not a H2S prone area. However,

Contingency plan for H2S is available at site.

xix. To prevent well blowout during operation Blow out Preventor (BOP) system shall be installed. Focus on maintaining well bore hydrostatic pressure by proper pre well planning, drilling fluid, logging etc.

BOP installed and maintained as per OMR,

OISD guidelines. Hydrostatic head is


Sl. No.


xx. The company shall take measure after completion of drilling process, well plugging and secured enclosures, decommissioning of rig upon abandonment of well, the D/S shall be restored to near original condition. In the event that no economic quantity of HC is found a full abandonment plan shall be implemented for site as per Indian Petroleum Regulations.

Yes, being followed as per the standard

guideline.

xxi. Occupational health surveillance of the workers shall be carried out as per prevailing Acts and Rules.

Complied with. PME being carried out as per

company guidelines.

xxii. In case the commercial viability of the project is established, the company shall prepare detailed plan for development of oil & gas fields and obtain fresh clearance from Ministry.

This will be complied as per statutory guidelines.

xxiii. The company shall provide housing for construction labour within the site with all necessary infrastructure and facilities such as fuel for cooking, mobile toilets, mobile STP, safe drinking water, medical health care, crèche etc. The housing may be in the form of temporary structures to be removed after the completion of the project.

Yes, it is being followed as per the guidelines and requirements.

B.GENERAL CONDITIONS

S. No. General Conditions Remarks i The project authorities must strictly adhere to

stipulations made by Assam State Pollution Control Board, the State Government and any other satututory.

The stipulations made by the PCBA and State Govt. are followed.

ii No further expansion or modification of project shall be carried without prior approval of MOEF. In case of deviation or alteration in the project proposal from those submitted to this ministry for clearance, a fresh reference shall be made to Ministry to access the adequacy of conditions imposed and to add additional environmental protection measures required if any.

Being complied.

iii The emissions of (RSPM, SPM, SO2, NOx, HC& HOC) from DG set and flare stack shall conform the standards of SPCB. Regular monitoring of ambient air for HC and VOC as per CPCB guidelines. Stack height attached to DG sets shall be as per EPA and rules.

Ambient air & stack monitoring analysis is carried out by an Outside Agency. The values of Ambient air and emission of DG set in the areas (indicated) are within permissible limit.

S. No. General Conditions Remarks iv The project authorities must strictly Comply with

rules and regulations under Manufacture, Storage and Import of Hazardous Chemicals Rules 1989.Prior approval from Chief Inspectorate of Factories, Chief Controller of Explosive, Fire Safety Inspectorate etc must be obtained, wherever applicable.

No hazardous chemicals (as listed) are being used. However, PCBA will be approached with list for authorization as per MOEF guidelineif required.

v The project authorities must strictly Comply with rules and regulations with regard to handling and disposal of Hazardous Wastes (Management and handling) rules 1989/2003 wherever applicable. Authorization from SPCB must be obtained for collections/ treatment / storage / disposal of hazardous wastes.

No hazardous chemicals (as listed) are being used. However, PCBA will be approached fornecessary authorization as per MOEF guidelines, if required.

vi The overall noise levels in and around the plant shall be kept within the standards by providing noise control measure including acoustic hoods, silencers, enclosures etc. on all sources of noise generation. The ambient noise levels shall conform to EPA rules, 1989 viz. 75 dBA (daytime) and 70 dBA (night time).

All DG sets are fitted with Acoustic Enclosures. The ambient noise values are well within stipulated guideline.

vii. A separate Environmental Management Cell equipped with full fledge laboratory facilities to carry out environment management and monitoring functions.

Fully equipped Regional Geoscience

Laboratory is located at Sivasagar.

PCBA approved laboratories also

engaged for the purpose.

viii The project authorities shall provide adequate funds both recurring and non-recurring to implement the conditions stipulated by MOEF and State Govt. along with implementation schedule for all the conditions stipulated herein. The funds so provided shall not be diverted for any other purpose.

Complied.

ix The Regional Office of this Ministry/Central Pollution Control Board will monitor the stipulated condition. A six monthly compliance and the monitored data along with statistical interpretation to be submitted to them regularly.

Six monthly compliance reports being submitted regularly by Basin HSE

x The project proponent shall inform the public that the project has accorded environmental clearances and copies of clearances letters are available with the State Pollution Control Board and also be seen at Web site of the Ministry of Forests at http://www.envfor.nic.in.This shall be advertise with in seven days of the issue of this letter in at least two local newspapers that are widely circulated in the region of which one shall be in the vernacular language of the locality concerned..

Complied with.

S. No. General Conditions Remarks xi. The project authorities shall inform the RO as well

as the Ministry, the date of financial closure and final approval of project by the concerned authorities and date of commencing of land development work.

Noted for compliance.

xii The above conditions will be enforced, inter-alia under provision of Water (Prevention & Control of Pollution) Act 1974, Air(Prevention & Control of Pollution) Act 1981, Environment (Protection) Act 1986, Hazardous Waste Rules 1989, 2003 and Public Liability Insurance Act 1991 along with their amendments and rules.

All statutory requirements are obtained by HSE Basin from PCBA under Water Act 1974, Air Act 1981, and Hazardous Waste Rules 1989. Consent to establish application submitted in advance.

(Pradeep Kumar) DGM(D), I/C HSE

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