ENVIRONMENTAL IMPACT ASSESSMENT STUDIESenvironmentclearance.nic.in/writereaddata/EIA/07122016OQXF94QFeia.pdf · 1.8 Environmental Setting of Well LKBB (1 Km Radius) C1-13 1.9 Environmental

142 IDA, Phase-II, Cherlapally, Hyderabad500 051

[email protected], www.vimta.com

(NABET - QCI Accredited, NABL Accredited & ISO 17025 Certified Laboratory,

Recognized by MoEF, New Delhi)

Prepared by :

November, 2016

Sponsor :

M/s. Oil and Natural Gas Corporation Ltd.Assam & Assam Arakan Basin,

Cinnamara, Jorhat 785 704

ENVIRONMENTAL IMPACT ASSESSMENT STUDIES FOR

THE PROPOSED DRILLING OF 8 EXPLORATORY WELLS IN PML AREAS

OF NAS BLOCK IN SIBSAGAR DISTRICT, ASSAM

FINAL REPORT

M/s. Oil and Natural Gas Corporation Ltd. Assam & Assam Arakan Basin,

Cinnamara, Jorhat - 785704


THE PROPOSED DRILLING OF 8 EXPLORATORY WELLS IN PML AREAS OF

NAS BLOCK IN SIBSAGAR DISTRICT, ASSAM

For and on behalf of VIMTA Labs Limited

Approved by : M. Janardhan

Signature :

Designation : Head & Vice President (Env)

Date : November , 2016

The report has been prepared inline with the prescribed TORs issued vide No.

F.No.J-11011/343/2014-IA II (I) dated 22nd June, 2015 of Ministry of Environment

and Forests, New Delhi.

This report has been prepared by Vimta Labs Limited with all reasonable skill,

care and diligence within the terms of the contract with the client,

incorporating our General Terms and Conditions of Business and taking

account of the resources devoted to it by agreement with the client.

PREFACE

Environmental Impact Assessment Report for Proposed Drilling of 8 Exploratory Wells in PML Areas of NAS Block in Sibsagar District, Assam

Table of Contents

VIMTA Labs Limited, Hyderabad TC-1

Table of Contents ________________________________________________________________ Chapter Title Page ________________________________________________________________

Table of Contents TC-1 List of Figures TC-4 List of Tables TC-5 1.0 Introduction 1.1 Purpose of the Report C1-1 1.2 Identification of Project & Project Proponent C1-1 1.3 Brief Description of the Project C1-2 1.4 Scope of the Study C1-16 2.0 Project Description 2.1 Introduction C2-1 2.2 Type of Project C2-1 2.3 Need for Exploratory Drilling C2-1 2.4 Project Location and Layout Details C2-1 2.5 Size or Magnitude of Operation C2-3 2.6 Proposed Schedule for Project Approval and

Implementation C2-8 2.7 Technology and Drilling Process Description C2-8 2.8 Details of Project Utilities C2-11 2.9 Post Drilling Operations Abandonment and Restoration C2-16 2.10 Sources of Pollution C2-17 2.11 Qualifications, Skills and Training Practice C2-21 3.0 Baseline Environmental Status

3.1 Introduction C3-1 3.2 Hydrogeology and Geomorphology C3-1 3.3 Land use Studies C3-10 3.4 Soil Characteristics C3-16 3.5 Meteorology C3-20 3.6 Ambient Air Quality C3-32 3.7 Water Quality C3-38 3.8 Noise Level Survey C3-46 3.9 Ecological Studies C3-50 3.10 Demographic and Socio-economic need based assessmentC3-64

4.0 Impact Assessment and Mitigation Measures 4.1 Impact Assessment C4-1 4.2 Anticipated Impacts from the Project C4-2 4.3 Environment Management Plan C4-23 4.4 Monitoring Environmental Performance C4-30 4.5 Emergency Response and Contingency Planning C4-31


Table of Contents


Table of Contents (Contd.) ________________________________________________________________ Chapter Title Page ________________________________________________________________

4.6 Waste Management Plan C4-37 4.7 Drilling Site Restoration Plan C4-38 5.0 Analysis of Alternatives 5.1 Alternative for Technology C5-1 5.2 Alternatives for Project site C5-1 6.0 Environmental Monitoring Programme 6.1 Introduction C6-1 6.2 Environmental Monitoring and Reporting Procedure C6-1 6.3 Reporting Schedule of the Monitoring Data C6-3 6.4 Infrastructure for Monitoring of Environmental Protection Measures C6-3 6.5 Environmental Costs C6-4 6.6 Audit and Review C6-4

7.0 Additional Studies 7.1 Public Consultation C7-1

7.2 Risk Assessment C7-1 7.3 Recommendations to Mitigate Risk/Hazards C7-11 7.4 Disaster Management Plan C7-12 7.5 Emergency Response Action C7-18 7.6 Emergency Response Procedures C7-19 7.7 End of Emergency C7-36 7.8 Communications C7-37

8.0 Project Benefits 8.1 Improvement in the Physical Infrastructure C8-1 8.2 Improvement in the Social Infrastructure C8-1 8.3 Employment Potential C8-2 9.0 Administrative Aspects

9.1 Operational Philosophy C9-1

9.2 Health Safety and Environment C9-2 9.3 Environmental Organization and Personnel C9-4


Table of Contents


Table of Contents (Contd.) ________________________________________________________________ Chapter Title Page ________________________________________________________________

10.0 Summary and Conclusion

10.1 Location Details of the Project C10-1 10.2 Importance of the Proposed Project C10-2 10.3 Details of Exploration Drilling Operations C10-2 10.4 Baseline Environmental Status C10-3 10.5 Impact Assessment C10-5 10.6 Environment Management Plan C10-7 10.7 Environmental Monitoring Program C10-9 10.8 Risk Assessment and Disaster Management Plan C10-9 10.9 Project Benefits C10-9 10.10 Administrative Aspects C10-10 10.11 Conclusions C10-10

11.0 Disclosure of Consultants

11.1 Introduction C11-1 11.2 Vimta Labs Limited C11-1

List of Annexures

Annexure-I Terms of Reference Letter and Compliance Annexure-II Applicable Environmental Standards Annexure-III Methodology for Sampling and Analysis Annexure-IV Forest Clearance Letter Annexure-V Land use Pattern Annexure-VI Ambient Air Quality Levels Annexure-VII Demographic Details Annexure-VIII Emission Calculations Annexure-IX Public hearing minutes of the meeting Annexure-X Pool Fire Calculations Annexure-XI Secondary Data for Risk Analysis Annexure-XII Existing CSR Budget Annexure-XIII Corporate Environment Policy


Table of Contents


List of Figures ________________________________________________________________ Figure Title Page ________________________________________________________________

1.1 Index Map C1-5 1.2 Topographic Map NAS Block in Sibsagar District C1-6

1.3 Google Map Showing Well Locations in NAS Block C1-7 2.1 Typical Layout of Well Site C2-5 2.2 Drilling Rig C2-10 2.3 Drilling Fluid Circulation System at Typical Rig C2-15 2.4 Typical Section View of Drilling Cut and Drill Mud

Collection Pit C2-20

3.2.1 Hydrogeology Map of Sibsagar District C3-5 3.2.2 Seismic Zone Map of India C3-8 3.2.3 Flood Hazard Map of Sibsagar District C3-9

3.3.1 Satellite Imagery of the Study Area C3-14 3.3.2 Landuse Imagery of Study Area C3-15 3.4.1 Soil Sampling Locations C3-17 3.4.2 Photographs of Soil Sampling C3-18 3.5.1 IMD Golaghat Pre Monsoon Season C3-25 3.5.2 IMD Golaghat Monsoon Season C3-26 3.5.3 IMD Golaghat Post Monsoon Season C3-27 3.5.4 IMD Golaghat Winter Season C3-28 3.5.5 IMD Golaghat- Annual Windrose C3-29 3.5.6 Site Specific Windrose Winter Season C3-31 3.6.1 Air Quality Sampling Locations C3-35 3.6.2 Photographs of Ambient Air Quality Sampling C3-36 3.7.1 Water Sampling Locations C3-40 3.7.2 Photographs of Surface & Ground water sampling C3-41 3.8.1 Noise Monitoring Locations C3-47 3.8.2 Noise Monitoring Photographs C3-48 3.9.1 Ecological Sampling Locations C3-54 4.1 Short Term 24 hourly GLCs of SO2 C4-10 4.2 Short Term 24 hourly GLCs of NOx C4-11 4.3 Noise Level Contours C4-19

7.1 Objectives of Risk Assessment C7-4 7.2 Methodology of MCA Analysis C7-5 7.3 Flow Chart for Evaluation of Consequences during the

Release of Flammable or Toxic Chemical C7-8 7.4 Emergency Classification C7-14 7.5 Contingency Plan for Onshore Blowout (Drilling Rig) C7-20 7.6 Typical Schematic of BOP Stack C7-23 9.1 Organizational Structure for Environmental Management C9-6


Table of Contents


List of Tables

Tables Title Page

1.1 Block Coordinates C1-3 1.2 Tentative Well Locations C1-4 1.3 Environmental Setting of Well GKBS (1 Km Radius) C1-8 1.4 Environmental Setting of Well GKBS (1-Km Radius) C1-9 1.5 Environmental Setting of Well MKAD (1 Km Radius) C1-10 1.6 Environmental Setting of Well NGAB (1-Km Radius) C1-11 1.7 Environmental Setting of Well DGAJ (1 Km Radius) C1-12 1.8 Environmental Setting of Well LKBB (1 Km Radius) C1-13 1.9 Environmental Setting of Well CHAQ (1 Km Radius) C1-14 1.10 Environmental Setting of Well CHAR (1 Km Radius) C1-15 1.11 Environmental Attributes and Frequency of Monitoring C1-18 2.1 Tentative Well Locations C2-2 2.2 Salient Features of the Proposed Exploratory Drilling wells in NAS Block of Assam C2-3 2.3 Typical Water Requirements per Well Site C2-4 2.4 Details of DG Sets C2-6 2.5 Constituents of Water Based Mud (WBM) C2-6 2.6 Special Additives and Their Functions in Water Based Mud C2-7 2.7 Composition and Parameters of Water Based Drilling Mud C2-7 2.8 Hole Size and Casing Details C2-9 3.2.1 The Dynamic Groundwater Resources of Sibsagar District As On 31.03.2011 C3-4 3.2.2 Significant Earthquakes in Assam C3-6 3.2.3 Flood History of Assam C3-7 3.3.1 Landuse Pattern in the Study Area C3-10 3.3.2 Landuse /Land Cover Classification System C3-12 3.3.3 Land Use Break Up of the Study Area C3-13 3.4.1 Details of Soil Sampling Locations C3-16 3.4.2 Soil Analysis Results C3-19 3.4.3 Standard Soil Classification C3-20 3.5.1 Sensitivity of Meteorology Monitoring Equipment C3-21 3.5.2 Climatological Data Station IMD, Golaghat (1951-1980) C3-22 3.5.3 Summary of the Meteorological Data Generated at Site C3-30 3.6.1 Details of Ambient Air Quality Monitoring C3-33 3.6.2 Summary of Ambient Air Quality Results C3-37 3.7.1 Details of Water Sampling Location C3-39 3.7.2 Surface Water Quality C3-43 3.7.3 Ground Water Quality C3-45 3.8.1 Details of Noise Monitoring Location C3-49 3.8.2 Noise Levels in the Study Area C3-49 3.8.3 Ambient Noise Standards C3-50 3.9.1 Forest Blocks within Study Area C3-51 3.9.2 Details of Proposed Oil Drilling Locations C3-52 3.9.3 Details of Terrestrial Ecological Sampling Locations C3-52 3.9.4 Plant Species Recorded in Block Area C3-55 3.9.5 List of Agricultural Crops C3-58 3.9.6 List of Fauna around the Project area C3-59 3.9.7 Details of Aquatic Sampling Locations C3-62


Table of Contents


List of Tables (Contd)

Tables Title Page

3.9.8 List of Phytoplankton Species Identified from Study Area C3-63 3.9.9 List of Zooplankton Species Identified from Study Area C3-63 3.9.10 List of Species of Fishes Found in the Study Area C3-63 3.10.1 Distribution of Population in the study area C3-65 3.10.2 Distribution of Population by Social Structure C3-66 3.10.3 Distribution of Literate and Literacy Rates C3-66 3.10.4 Occupational Structure C3-67 3.10.5 Educational Facilities in the Study Area C3-68 3.10.6 Health Facilities in the rural villages of the study area C3-69 3.10.7 Drinking water facility in the rural villages of the study area C3-70 3.10.8 Communication Infrastructure on the NAS block area C3-70 3.10.9 Availability of power supply in the NAS block area C3-71 4.1 Summary of Impact Assessment: Soil and Landuse C4-4 4.2 Details of DG Sets C4-7 4.3 Emission Characteristics Model Inputs C4-8 4.4 Predicted 24 Hourly Short Term Incremental Concentrations C4-8 4.5 Resultant Concentrations due to Incremental GLCs C4-9 4.6 Summary of Impact Assessment: Water Resources C4-15 4.7 Input Data for Noise Modeling C4-17 4.8 Predicted Noise Levels C4-18 4.9 Noise Exposure Levels & Its Effects C4-18 4.10 Summary of Impact Assessment: Flora and Fauna C4-21 4.11 Summary of Environmental Management Actions C4-32 6.1 Schedule of Environmental Monitoring C6-2 7.1 List of Major Hazards C7-3 7.2 Occupational Hazards C7-3 7.3 Damage due to Peak over Pressure C7-6 7.4 Damage due to Incident Radiation Intensities C7-6 7.5 Input Data for Consequence Analysis C7-7 7.6 Summary of Consequence Analysis for Jet Fire Scenario at Well C7-9 7.7 Probability of Ignition for Leaks of Flammable Fluids C7-10 7.8 The Adnoc Individual Risk Assessment Criteria C7-10 7.9 Recommendations to Mitigate Blow out Risk/Hazards C7-11

142 IDA, Phase-II, Cherlapally, Hyderabad500 051

[email protected], www.vimta.com

(NABET - QCI Accredited, NABL Accredited & ISO 17025 Certified Laboratory,

Recognized by MoEF, New Delhi)

Prepared by :

November, 2016

Sponsor :

M/s. Oil and Natural Gas Corporation Ltd.Assam & Assam Arakan Basin, Dhansiri Bhavan,

Cinnamara, Jorhat - 785704


THE PROPOSED DRILLING OF 8 EXPLORATORY WELLS IN

PML AREAS OF NAS BLOCK IN SIBSAGAR DISTRICT, ASSAM

EXECUTIVE SUMMARY

Environmental Impact Assessment Report for Proposed Drilling Of 8 Exploratory Wells in PML Areas of NAS Block in Shivasagar District, Assam

Executive Summary

VIMTA Labs Limited, Hyderabad ES-1

1.0 EXECUTIVE SUMMARY

Oil and Natural Gas Corporation Limited (ONGC) proposes to carryout

exploratory drilling in PML areas of North Assam Shelf (NAS) block in Sibsagar

district, Assam. Out of the proposed 8 exploratory drilling wells, 2 exploratory

drilling wells falls in Charali ML area, 4 exploratory drilling wells falls in Geleki, SE

Geleki & Mekeypore-Santak-Nazira ML area and 2 exploratory drilling wells in

Lakwa ML area of Sibsagar district, Assam.

As per the Environment Impact Assessment (EIA) Notification dated 14th

September, 2006, the proposed exploratory drilling project falls under Category

A of Activity Type 1(b). The EIA Report is prepared considering the TOR received

from MoEF vide letter reference F.No. J-11011/343/2014-IA II (I) dated 22nd

June, 2015.

This EIA Report is prepared inline with the ToR issued by MoEF&CC and addresses

the anticipated environmental impacts of the proposed project and proposes the

mitigation measures for the same for obtaining Environmental Clearance (EC)

from MoEF&CC, New Delhi. The report covers the primary data collected during

15th January 2016 to 8th April 2016 representing partly winter and pre monsoon

season.

1.1 Project Description

1.1.1 Location Details of the Project

Charali Mining Lease (ML) is one of the important oil producing fields of ONGC

situated in Sibsagar District of Assam. The area of this lease is 51.63 km2. This

ML area forms the part of North Assam shelf and had been producing

hydrocarbons for more than three decades from Barails and Tipams. A 20 years

ML was obtained with effect from 20.03.1999 (Ref: MOPNG, Govt. of India, Letter

No. O-12012/94/2002-ONG/D-IV, dated 29th April-2002) and is valid upto

19.03.2019. So far, 46 numbers of wells (including exploratory wells and

development wells) have been drilled in this field with depths ranging from 2400

m to as deep as 4000 m.

Geleki and its satellite fields Mekeypore, Santak & Nazira are some of the

important oil producing fields of ONGC situated in Sibsagar District of Assam.

These areas form the part of North Assam shelf and had been producing

hydrocarbons for more than three decades from Barails and Tipams.

ONGC has received Mining Lease of these areas from MOPNG, Govt of India for

exploring and producing hydrocarbons. The Mining Lease (ML) areas with their

respective validity are given below:

1. Geleki ML (Area: 27.94 sq.km, with effect from 16.08.1990 to 15.08.2030)

2. SE Geleki ML (Area: 20.5 sq.km, with effect from 30.01.2006 to 29.01.2026)

3. Mekeypore-Santak-Nazira ML (Area: 77.0 sq km, with effect from 30.01.2006

to 29.01.2026)

Lakwa Mining Lease (ML) contains important oil producing fields of ONGC situated

in Sibsagar District of Assam. The area of this lease is 172.49 square kilometers.


Executive Summary


This ML area forms the part of North Assam shelf and has been producing


ML has been obtained with effect from 29.09.2008 and is valid upto 28.09.2028.

So far, 681 numbers of wells (including exploratory and development wells) have

been drilled in this mining lease with depths ranging from 2259 m to as deep as

5113 m.

The area has undulating terrain with tea gardens. Elevation of the block varies

from 101 m to 104 m. The block coordinates are given in Table-1. Tentative well

coordinates are as given in Table-2.

TABLE-1

BLOCK COORDINATES

Sr. No ML Name Boundary Points Well Coordinates (WGS-84)

Latitude Longitude

1 Geleki ML (27.94 sq.km)

I 2604920.06 9404406.54

Z 2604911.88 9404143.98

Y 2604750.92 9404028.25

U 2604637.32 9404014.88

V 2604625.87 9404135.07

W 2604646.31 9404415.45

2 SE Geleki ML (20.5 sq.km)

A 2604614.8 940390.00 B 2604415.0 940390.00 C 2604400.0 940400.00 D 2604415 940410.00 E 2604515 940430.00 F 2604636.72 940430.00 G 2604631.59 9404219.62 H 2604543.24 9404056.71 I 2604537.5 9403930.71 J 2604628.68 9403942.21 A 2604614.8 940390.00

3 MK-SN-NZ-ML (77.00 Sq.Km)

Part-I (12.00 Sq.km)

A 2605713.88 9404316.45 B 2605713.84 9404430.0 C 2605330.00 9404330.0 D 2605327.46 9404041.61 E 2605647.00 9404326.45 A 2605713.88 9404316.45

Part-II

(57.00 Sq.km)

F 2605430.00 940470.00 G 2605230.00 940480.00 H 2604722.00 9404415 I 2604920.06 940446.54 J 2604911.88 9404143.98 K 260500.00 9404132.23 F 2605430.00 940470.00

4 Charali ML (51.63 Sq.Km)

A 2605619.90 9403935.68 B 2605622.50 94039.40.86 C 2605831.00 94039.38.86 D 2605903.57 9404322.83 E 2605647.00 9404326.45 F 2605327.46 9404041.61 G 2605310.28 9403808.36

5 Lakwa ML (172.49 Sq.Km)

A 2705957.75 9404317.57

B 2700016.00 9404541.00

C 2700112.75 9404601.29

D 270050.00 9405433.50

E 270050.00 9405638.00

F 2700001.25 9405559.86


Executive Summary


Sr. No ML Name Boundary Points Well Coordinates (WGS-84)

Latitude Longitude

G 2605908.00 9405411.86

H 2605904.00 9405242.71

I 2605836.75 9405209.50

J 2605836.50 9405050.00

K 2605750.50 9404701.71

L 2605713.75 9404701.00

M 2605713.88 9404316.50

TABLE-2

TENTATIVE WELL LOCATIONS

Sr. No Proposed

Location

Well Coordinates (WGS-84) Nearest Village District

Latitude Longitude

1 GKBS 26o4531.82N 94o4005.54E Existing Geleki Block

Sibsagar,

Assam

2 GKBT 26o4741.65N 94o4304.71E Moran Gaon, Mouza - Athkhel

Sibsagar, Assam

3 MKAD 26o5203.991N 94o4647.221E Village Sundar Pukhuri Hulal gaon, Mouza - Juktoli

Sibsagar, Assam

4 NGAB 26o4945.130N 94o4600.093E Village Harkina Mouza Athkhel

Sibsagar, Assam

5 DGAJ 26o5814.69N 94o4634.70E

Village -Jojoli Gaon, Mouza Silakuti/Mahmora

Sibsagar, Assam

6 LKBB 27o0141.296N 94o4953.111E Village Kotoky Papong Mouza - Khaloighugura

Sibsagar, Assam

7 CHAQ 26o5612.73N 94o4111.13E Mothiasiga, Mouza - Juktoli, Sibsagar.

Sibsagar, Assam

8 CHAR 26o5751.849N 94o4023.018E Village Kurulakatia Mouza Meteka, Bongaon ,Sibsagar, Assam

Sibsagar, Assam

The study area map showing the block location and exploratory drilling well

locations are shown in Figure-1.

The details of environmental setting of the project block area are given below.

There is a reserve forest block (Geleki RF) within the study area.

The major water bodies in the project block area are Deopani nadi & Jhansi river

The project block is connected through National Highways NH-61 and Tuli railway station, Nemtiah railway station, Santak railway station and Nazira

railway station to rest of the region;

No archaeologically important places are present within project block as per Archaeological Survey of India (ASI) records; and

The block area falls under Seismic ZoneV as per IS: 1893 (Part-1) 2002.


Executive Summary


FIGURE-1

TOPOGRAPHIC MAP NAS BLOCK IN SIBSAGAR DISTRICT


Executive Summary


1.1.2 Importance of the Proposed Project

India is not among the major producers of crude oil, as it doesnt have much oil

reserves. Therefore, India generally depends on imports of crude oil from other

countries. There is a heavy imbalance between oil production and consumption in

India. The Indian government is encouraging exploration and production of oil

and gas to a great extent. This would primarily allow India to tap its own

resources there by reducing its import bill.

Discovery of viable hydrocarbon reserves in the state can boost the states

economic development to a great extent. The proposed exploration project is thus

of immense significance for the state.

1.1.3 Details of Exploration Drilling Operation

It is proposed to drill eight exploratory wells in the delineated area selected

through seismic survey to identify and establish hydrocarbon potential. The

proposed project intends to identify the presence of hydrocarbon prospects

through exploratory drilling and to delineate and quantify hydrocarbon pools in

discovered fields through appraisal drilling. The wells will be drilled upto a target

depth of about 3500 m by using water-based drilling mud only.

1.1.4 Infrastructure Requirement

Project Cost: The estimated cost of the proposed exploration well drilling per each

well would be approximately Rs. 40 Crores and total of Rs. 320 crores for eight exploratory drilling wells

Land Requirement: Minimum land required at each well site during drilling will be

125 m x 125 m, i.e., 1.56 ha. On an average, the land requirement at each well

site, including site facilities and camp site is considered as 1.5-2.25 ha. The land will

be acquired on a temporary basis and adequate compensation as per the guidelines

of local administration will be provided.

Power Requirement: The total power requirement at the drilling site will be 2250

KVA. The power requirement in the drilling site will be catered through Diesel

Generator (DG) sets. The power requirement will be met by 3 Nos of 750 KVA DG

sets at drilling site. Stand by DG set arrangement of 750 KVA at drilling site will be

made.

Water Requirement: Water is basically required for preparing drilling mud and for

meeting domestic needs of the campsite. Typically, the water consumption for each

well ranges from 20-25 m3/day for a short period of 4-5 months. However, the

drilling and domestic water requirement would depend on the time required to

drill the well, which is primarily dependent on the proposed depth.

Man Power: The drill site construction would be done largely employing local

labour. At each drill site construction, local employment will be generated for

about 30 person/shift of 12 hrs. in two shifts.


Executive Summary


1.2 Description of the Environment

Environmental baseline data survey has been carried within the entire NAS block,

during 15th January 2016 to 8th April 2016 covering winter and partly pre-

monsoon season covering

1.2.1 Land Use Studies

The land use pattern of the NAS block has been studied by District Census Hand

Books and satellite images. It is observed that no forest land falls under the block

area and 3.56 % of the land falls under cultivable waste land. On the other hand,

59.44 % of land falls under unirrigated area. The area not available for cultivation

is about 7.75 % forms the bulk of the land use.

1.2.2 Soil Quality

The soil samples were tested at 11 locations during winter season covering

various land uses. It has been observed that the pH of the soil ranged from 7.18

8.01 indicating that is slightly alkaline to moderately alkaline in nature. The

electrical conductivity was recorded as 175 S/cm to 358 S/cm. The organic

carbon content in the study area observed as 0.25 % to 0.72 %, which the soil

falls under medium to on an average sufficient category. The phosphorus values

ranged between 19.5 58.7 kg/ha. The nitrogen values ranged between 24.5

59.6 kg/ha. The potassium values ranged between 85.1 168.7 kg/ha.

1.2.3 Meteorology

On-site monitoring was undertaken for various meteorological variables in order

to generate the site-specific data. The data generated is then compared with the

meteorological data generated by nearest India Meteorological Department (IMD)

stations located at Golaghat. The meteorological data generated at the monitoring

site when compared with the data recorded at nearest IMD station, it is observed

that the data generated at the site is broadly in comparison with regional

meteorology, except for minor variations.

1.2.4 Ambient Air Quality

To establish the baseline status of the ambient air quality in the study area, the

air quality was monitored at 11 locations during partly winter and partly pre-

monsoon season of 2016. Out of the eleven locations the minimum and maximum

concentration for PM10 were varied between 30.0 to 51.8 g/m3 during the study

period which are well within the NAAQ standard i.e 100 g/m3.

The minimum and maximum concentration for PM2.5 were varied between 12.6 to

17.2 g/m3 during the study period which are well within the NAAQ standard i.e

60 g/m3 .The concentration of SO2 were varied between 10 to 16.5 g/m3 during

the study period which are well within the NAAQ standard i.e 80 g/m3.The

concentrations of NOx were varied between 12.1 to 20.8 g/m3 during the study

period which are well within the NAAQ standard i.e 80 g/m3.


Executive Summary


The minimum and maximum concentration for CO were varied between 185-296

g/m3 during the study period which are well within the NAAQ standard i.e 2000

g/m3.

The minimum and maximum concentration for total hydrocarbons, methane

hydrocarbons and non-methane hydrocarbons during the study period were

observed as 195 to 300 g/m3, 99 to 164g/m3 and 70 to 137 g/m3 respectively.

The concentrations of VOCs were below the detectable limits in all the locations

during the study period. From the analysis of the monitored data, it infers that the

air quality levels in the study area are of fairly good quality and comply with the

National Ambient Air Quality Standards.

1.2.5 Water Quality

The baseline water quality status in the region is established by analyzing about 7

ground water samples and 6 surface water samples during study period.

The physico-chemical and biological analysis revealed that most of the parameters

in ground water samples are well within the permissible limits when there is no

alternative choice as per IS: 10500. The physico-chemical and biological analysis

revealed that all the parameters in surface water samples are well within the

prescribed limits of IS: 10500 limits.

1.2.6 Ambient Noise Levels

The noise monitoring has been conducted at 11 locations, covering residential,

commercial and silence zones in the study area. A review of this data indicates that

at all the locations, the noise level was found within the permissible limits of CPCB.

1.2.7 Ecological Environment

An ecological survey in the study area was conducted particularly with reference to

the listing of species and assessment of the existing baseline ecological (Terrestrial

and Aquatic ecosystem) conditions in the study area. There are no reserved forest

and national park present inside the block area.

Hoollongapar Wildlife Sanctuary is located at 23 Km in WSW direction from the

block boundary. The sanctuary has an area of 2098.62 ha. The sanctuary area is

endowed with medicinal herbs and wide variety of plants and characteristic fauna in

the sanctuary is the presence of Holoock gibbon and apart from the presence of

elephants and other reptilian species such as phyons.

Distance wise and direction from the cluster of the drilling wells from the

Hoolongapar Gibbon Wildlife Sanctuary. Gibbons are endangered species, as per

wildlife protection act 1972 listed in Schedule I species and are only apes found in

India.

During the floristic survey, a total of 128 plant species were recorded which

consists of 83 tree species, 23 shrub species, 17 herb species, 4 climbers and 1

parasites were recorded from the study area.


Executive Summary


1.2.8 Socio-Economic Environment

The configuration of male and female indicates that the males constitute about

51.09% and females to 48.91% of the total population as per 2011 census

records. The study area on an average has 957 females per 1000 males.

In the study area, as per 2011 census, 1.72 % of the population belongs to

Scheduled Castes (SC) and 1.68 % to Scheduled Tribes (ST).

The percentage of literates to total population is 81.97 %. As per census records

the total work participation in the project study area is 41.27% and the non-

workers constitute 58.73 % of the total population respectively. The distribution

of workers by occupation indicates that the non-workers are the predominant

population. The main workers to the total workers are 60.66% and the marginal

workers constitute to 39.34% to the total workers.

1.3 Anticipated Environmental Impacts

The identification and assessment of impacts over the various environmental

attributes in the region due to the proposed exploratory drilling activities in the

project block have been discussed followed by mitigative measures and

environmental management plan for the potential impacts due to the proposed

project activities.

The proposed exploratory drilling activities will last for 4 to 5 months and hence

the impact due to the project are temporary and reversible in nature and will be

localised.

1.3.1 Impact on Topography and Land Use

Considering the small foot print area required during the drilling, only marginal

impact due to change in land use is anticipated and there is no topographical

change is envisaged.

1.3.2 Impact on Climate

Impact on the climatic conditions from the drilling will not be significant.

Considering the quantum of exit gas and the short duration of flow, the impact on

the local or global climate will be insignificant.

1.3.3 Impact on Air Quality

The potential sources of air emissions at the well sites will be as follows:

Dust from earth works (during approach road and site preparation); Emissions from DG sets; Emissions from possible flaring during well testing; and Emissions from vehicles

During the short period of site preparation, mechanical shovels and earthmovers

will be used for vegetation clearance, cut and fill and other site leveling activities.


Executive Summary


However, these activities will be only temporary and the impact to ambient air

quality would be within the close proximity of well site.

The gaseous emissions from the DG set will be controlled by efficient combustion

of fuel in the DG set. The flaring of oil and gas during well testing is a short

duration activity (about 14-21 days). The dimensions of the typical flaring pit

would be approximately 25 m x 10 m x 2 m deep will be used. The setting out of

the flare pit will be done in a manner to direct the flame away from any pockets

of cultivation / existing green cover. Wherever required, special precautions will

be taken to minimize the impact on the local environment and habitat.

1.3.4 Impact on Surface Water and Groundwater Quality

Approximately 15-20 m3/day of wastewater and 8 m3/day of sewage would be

generated from each well site. Water based non-toxic biodegradable fluids with

inhibitive and encapsulative characteristics are proposed to be used as drilling

mud for minimizing any long term impact on groundwater quality.

Additionally, the drilling mud collection and recirculation pond is lined with

impervious layer to prevent seepage and loss of drilling fluid into the subsoil.

Further, proper casing installation and cementing of well will ensure least

groundwater contact. The clarified wastewater will be treated in packaged

treatment plant located at the well sites to meet norms specified by CPCB and

ASPCB. The sewage will be discharged into septic tanks and then to subsoil

through soak pits.

1.3.5 Impact on Noise Levels

The maximum predicted noise level at about 100 m from the boundary of the drill

site is about 52.0 dB (A). The ambient noise levels at most of the places in the

region are within the CPCB standards. Since, the drilling operations last for only

120-150 days at each location, impact of the noise due to the proposed

exploratory drilling will be insignificant on the community and will be minimized

after 100 m from drilling well site boundary.

1.3.6 Ecological Impacts

Impact on the ecology of the study area will vary with the proximity of the

habitats from the drilling locations. However, the impacts are of temporary

nature, which will last for few days at each drill location during the exploratory

drilling activities and will thus allow subsequent recovery after the activities

stops.

1.3.7 Demography and Socio-Economics

Although the level of existing communications and support services in the area

are considered adequate based on the population density, establishment of the

proposed project would further strengthen the road network and access to some

of the remote areas with all-weather roads would be of distinct beneficial impact.

The overall impact is considered to be positive.


Executive Summary


Impact on health due to emissions and noise from drilling activity has been

assessed to be minimal. In addition employees working at the drill site would be

provided protective devices like ear plugs/ear muffs for ensuring minimum impact

on human health.

For most potential drilling sites in the exploration area, it should be possible to

avoid impact on existing arable land. By following the compensation procedures

and by observing common courtesy, impacts on existing use and benefit rights

holders can be minimized.

1.4 Environment Management Plan

1.4.1 Removal of Equipment and Materials

After completion of the drilling activities, the well will be capped with a wellhead

in place, but all other equipment and materials will be removed from the site. The

site would be returned to its original form in most environment friendly manner.

All empty drums, wastes, used and unused drilling fluids, fuel and lubricants will

be removed from the drilling site. Water supply and effluent discharge hoses and

associated equipment will be removed. The access road(s) would be reinstated.

1.4.2 Decommissioning upon Abandonment

In the event that no economic quantities of hydrocarbons are found, a full

abandonment plan will be implemented for the drilling sites in accordance with

the applicable Indian petroleum regulations. The well will be capped and the land

would be handed over back to the owners in the original form.

1.4.3 Atmospheric Emissions

The combustion of diesel for power generation for the drilling and campsite

operation results in atmospheric emissions of SO2, NOx, CO, Particulates and

Hydrocarbons. Flaring during production testing is of 14 to 21 days duration and

atmospheric emissions are marginal.

There will be no sensitive receptors to the emissions of combustion products in

the vicinity of the proposed drilling operations apart from the crew of the drilling

rig. The impacts caused are therefore, considered to be negligible. Measures to

ensure minimal impacts include appropriate management of power generation

source to achieve fuel efficiency and therefore reduce emissions and use of low

sulphur diesel oil. Environmental monitoring is proposed during drilling and well

testing to ensure maximum combustion efficiency. Flaring towards any standing

vegetation will be avoided. In case if it is inevitable, a suitable barrier will be

erected to prevent any vegetation scorching due to direct heat radiation; and

prior to flaring, the critical equipment will be thoroughly tested.

1.4.4 Noise Environment

The modeling results show that the noise levels will attenuate to below

permissible levels within the drilling site boundary. The Generators will be

properly enclosed and the exhausts will be provided with silencers.


Executive Summary


1.4.5 Management of Drilling Wastes

The major waste product of a drilling operation is the generation of rock cuttings

with residual mud adhering to the drill cuttings and spent drilling fluid. About 500

m3 of drill cuttings per well and 15 m3 spent drilling fluid would need to be

disposed off.

ONGC proposes to use internationally followed methodologies while drilling with

Water Based Muds (WBM). The mud will be reused after its separation from the

cuttings. A mud mixing tank will be set up at the drilling site with a collection

system so that any spill of chemicals will be collected.

The spilled oil may be reused in the mud preparation. The residual drilling fluids

will be reused in the drilling campaign to the maximum extent and the drilling

fluid which can not be further used will be discarded as per procedure.

1.4.6 Management of the Solid Wastes

Small amounts of solid wastes will be generated during normal operation at the

drilling rig. The wastes will be disposed on compliance with local and national

legislations. Spent waste oil will be stored in a secure paved area and disposed to

MoEF/ CPCB approved waste oil recyclers. Drill cuttings and sludge from drilling

mud to be buried within the impervious lined pit and covered with soil as part of

the site abandonment plan. Biodegradable waste arising from kitchen and

canteen activities to be scientifically composted and the bio-manure so generated

to be used for green belt development.

1.4.7 Management of Waste Disposal sites within Drill Site

The project proponent is committed to dispose the drill cuttings, drill mud and

wastewater generated during the drilling operations into the lined pits of various

sizes and undertaking plantation within the drill site particularly on the reclaimed

pits will be undertaken.

1.5 Environmental Monitoring Program

A detailed post project monitoring in respect of air, water, soil, landuse,

occupational noise, etc. to assess the changes has been evolved covering various

phases of project advancement. A network of sampling locations around the drill

site will be established. The monitoring will include the compliances to legal and

statutory controls imposed on the operation as well as other corporate

commitment to responsible environment management. Systems for monitoring

resource inputs (energy, chemical use, water, raw materials), equipment and

waste generation will also be set up. A detailed wastes management plan with

monitoring programme will be in place during various phases of activity.

1.6 Risk Assessment and Disaster Management Plan

The hazard potential of oil and gas and estimation of consequences in case of

their accidental release during drilling has been identified and risk assessment

has been carried out to quantify the extent of damage and suggest

recommendations for safety improvement for the proposed facilities. Risk


Executive Summary


mitigation measures based on MCA analysis and engineering judgments are

incorporated in order to improve overall system safety and mitigate the effects of

major accidents.

An effective Disaster Management Plan (DMP) to mitigate the risks involved has

been prepared. This plan defines the responsibilities and resources available to

respond to the different types of emergencies envisaged. Training exercises will

be held to ensure that all personnel are familiar with their responsibilities and

that communication links are functioning effectively.

1.7 Project Benefits

The proposed exploration program will establish hydrocarbons in the block. The

development of the oil field will result in considerable growth of service sector and

will also generate new industrial and business opportunities in the area. Small

and medium scale industries may be developed as consequence.

The major benefits of the project include reduction of the oil import bill of the

nation as well as reduction of the imbalance in oil production and consumption.

The commercial development will also lead to investment in Assam, bringing oil

and gas revenues both to the State and to the Central Government. The presence

of ONGC in the region will substantially improves the socio-economic conditions of

the region.

The proposed exploration drilling programme is expected to generate local

employment for unskilled and semi- skilled people, for a period of approximately

4-5 months at each drilling site location. While this benefit is small by most

standards, it is a significant employment opportunity in the block.

1.8 Administrative Aspects

The basis of the operational philosophy is that the activities proposed in oil and

gas processing shall be operated in complete compliance with all applicable Laws,

Regulations, Standards and Permits, the Production Sharing Contract (PSC),

corporate policies, procedures, specifications, rules, standards and guidelines. In

order to achieve this, the proposed drilling sites will be maintained by technically

qualified and experienced people. Detailed procedures and plans will be

developed for each activity prior to operations start up. All persons on board the

drilling rig will be an experienced crew with valid qualifications.

The HSE department of ONGC is the nodal agency to coordinate and provide

necessary services on environmental issues during construction and operation of

the project.

1.9 Conclusions

The proposed exploratory drilling project has certain level of marginal impacts on

the local environment. However, the proposed project has significant beneficial

impact/effects in terms of providing the employment opportunities and various

CSR practices to be followed by ONGC. Growth and development, in harmony

with the environment, has always been the approach of ONGC.


Executive Summary


The conclusions of EIA are:

The proposed project will meet the compliance requirements of various environmental regulations;

Adoption of environmental friendly Best Management Practices results in minimising the impacts on environment;

Community impacts of the project will be beneficial, as the project will generate significant economic benefits for the region;

The post drilling, commercial developmental activities of ONGC can reduce the import burdens of crude oil on the nation; and

With the effective implementation of the Environment Management Plan (EMP) during the planning, design, construction and operation phases, the

development and production project can proceed without significant negative

impact on the environment.

AA-ONN-2009/3 NELP-VIII (EIA)

, Page 1

1.0 ( ) AA-ONN-2009/3 - , ,

-//- (Pt. II) --- AA-ONN-2009/3 NELP (% ) -- -- -

, ( ) Activity Type 1(b) Category A , J-11011/103/2012-IA II (I) MoEF TOR

AA-ONN-2009/3 - -

, -, -, - - , - , AA-ONN-2009/3

- 1.1 1.1.1 , - - (AMG-1, 2957-60 m AMG-5, 2890-93 & 2881-85 m), - (AMG-8A, 1906-16-TS-2, 1922.5-24m, 1790-96m-TS1) 2604400 2604900 9402030 9402600 :


, Page 2

-A 26o4748.27 N, 94o 23 39.97 E -B 26o4437.56 N, 94o 22 38.75 E -C 26o4902.35 N, 94o 21 08.04 E -D 26o4413.94N, 94o 22 11.54 E -F 26o4526.77 N, 94o 22 45.02 E -G 26o4748.50 N, 94o 25 40.09 E

: ()

,

; ( ) -

; : ( ) - V

1.1.2 , 1.1.3 -


, Page 3

- AA-ONN-2009/3


, Page 4

1.1.4 : : x , . - . . : : , 30 m3 , - , :

1.2

AA-ONN-2009/3 1.2.1 AA-ONN-2009/3 .% .% - .% 1.2.2 pH . . 135 S/cm 315 S/cm .% .% , 35 - 57 kg/ha


, Page 5

20 36 kg/ha 73 - 145 kg/ha 1.2.3 ( ) , - 1.2.4 - 2.1 g/m3 AAQ8 4.5 g/m3 AAQ12 (PM2.5) , (PM10) 10.7 g/m3 AAQ1 7.1 g/m3 AAQ7 SO2 NOx 4.7-8.6 g/m3 9.1-14.4 g/m3 221-308 g/m3 VOC BDL 1.2.5 - - IS:10500 - IS:10500 1.2.6 , 1.2.7


, Page 6

( ) NELP-VIII AA-ONN-2009/3 SSW . SSW . . -B -D , , , , , , , , , , - - , , , , , , , , , , , , , , ( , ), , - ( -), , - , , , , , - ( ) 1.6 2.5 1.2 1.8 -, (-) 1.2.8 -


, Page 7

- .% .% .% ( ) .% ( ) .% .% .% .% 1.3 - 1.3.1 1.3.2 1.3.3 :

( ) , -

- , , - -


, Page 8

( - ). - x x ' - 1.3.4 - - - / / - - - ,- , ( ) , - CPCB ASPCB- - 1.3.5 - . dB (A). - CPCB- , - , - 1.3.6 , , 1.3.7 - , - - , - , - /


, Page 9

1.4 1.4.1 , , , , , () 1.4.2 - - , 1.4.3 - SO2, NOx, CO, - - , - , - 1.4.4 - 1.4.5


, Page 10

- ONGC (WBM) 1.4.6 - - MoEF/ ASPCB - () - 1.4.7 , , , 1.5 , , , , -, - - , (, , , -), 1.6 - , - ,


, Page 11

MCA- , (DMP) 1.7 , ONGC- - - - - , - 1.8 , , , (PSC), , , , , HSE 1.9 , - ONGC- CSR


, Page 12

/ ONGC- (EIA)- :

;

;

,

;

ONGC- - ;

-, , (EMP) -


Chapter-1 Introduction

VIMTA Labs Limited, Hyderabad C1-1

1.0 INTRODUCTION

Oil and Natural Gas Corporation Limited (ONGC) proposes to carryout

exploratory drilling in PML areas of North Assam Shelf (NAS) block in Sibsagar

district, Assam. Out of the proposed 8 exploratory drilling wells, 2 exploratory

drilling wells falls in Charali ML area, 4 exploratory drilling wells falls in Geleki, SE

Geleki & Mekeypore-Santak-Nazira ML area and 2 exploratory drilling wells in

Lakwa ML area of Sibsagar district, Assam.

This chapter describes the purpose of the report, identification of project and

proponent, brief description of nature, size, location of the project and importance

to the region and country. The chapter also describes the scope of the study,

details of regulatory scoping carried out as per Terms of Reference (TOR) issued

by Ministry of Environment Forest and Climate Change (MoEF&CC), New Delhi.

1.1 Purpose of the Report

As per Environmental Impact Assessment EIA Notification dated 14th September,

2006, exploration of oil & gas falls under category A of project activity 1(b)

requires prior Environmental Clearance (EC) to be obtained from MoEF&CC before

the commencement of ground activity.

The application for prior EC (Form-1 and Pre-feasibility Report) for the proposed

project has been submitted to MoEF&CC on 29th December, 2014 and same was

reviewed by the Expert Appraisal Committee (Industry II) held during 16th 17th

March 2015 in New Delhi to prescribe Terms of Reference (TORs) for the

preparation of EIA/EMP report. TOR has been issued by MoEF vide letter reference

F.No. J-11011/343/2014-IA II (I) dated 22nd June, 2015. A copy of the ToR letter,

along with its compliance is enclosed as Annexure-I.

This EIA Report is prepared inline with the ToR issued by MoEF&CC and addresses

the anticipated environmental impacts of the proposed project and proposes the

mitigation measures for the same for obtaining Environmental Clearance (EC)

from MoEF&CC, New Delhi. The report covers the primary data collected during

15th January 2016 to 8th April 2016 representing partly winter and pre monsoon

seasons. Public Hearing for the proposed 8 exploratory drilling wells project has been

conducted on 04th October, 2016 and 6th October, 2016 by Assam State Pollution

Control (ASPCB) in accordance with TOR and the public hearing proceedings and

action plan have been included in this final EIA report.

1.2 Identification of Project and 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 company. 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.

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

valuable publicly-traded companies.

ONGC has been ranked 357th in the Fortune Global 500 list of the world's biggest

corporations for the year 2012. It is also among the Top 250 Global Energy




Company by PLATTS. ONGC was founded on 14 August 1956 by the Indian state,

which currently holds a 69.23% equity stake. It is involved in exploring

hydrocarbons in 26 sedimentary basins of India, and owns and operates over

11,000 kilometers of pipelines in the country. Its international subsidiary, ONGC

Videsh currently has projects in 15 countries.

1.3 Brief Description of the Project

1.3.1 Nature of the Project

As per the Environment Impact Assessment (EIA) Notification dated 14th

September, 2006, the proposed exploratory drilling project falls under Category

A of Activity Type 1(b).

The proposed project intends to identify the presence of hydrocarbon prospects

through exploratory drilling and to delineate and quantify hydrocarbon pools in

discovered fields through exploratory drilling. The proposed project will basically

involve drilling of eight exploratory wells in the block.

1.3.2 Size of the Project

ONGC has identified eight well locations GKBS, GKBT, MKAD, NGAB, DGAJ, LKBB,

CHAQ and CHAR are included in present EIA study. It is proposed to drill eight

exploratory wells for the fulfillment of Minimum Work Program (MWP) and also to

evaluate potential of the entire block.

1.3.3 Project Site Details

1.3.3.1 Location of the Block

Charali Mining Lease (ML) is one of the important oil producing fields of ONGC

situated in Sibsagar District of Assam. The area of this lease is 51.63 km2. This

ML area forms the part of North Assam shelf and had been producing


ML was obtained with effect from 20.03.1999 (Ref: MOPNG, Govt. of India, Letter

No. O-12012/94/2002-ONG/D-IV, dated 29th April-2002) and is valid upto

19.03.2019. So far, 46 numbers of wells (including exploratory wells and

development wells) have been drilled in this field with depths ranging from 2400

m to as deep as 4000 m.

Geleki and its satellite fields Mekeypore, Santak & Nazira are some of the

important oil producing fields of ONGC situated in Sibsagar District of Assam.

These areas form the part of North Assam shelf and had been producing

hydrocarbons for more than three decades from Barails and Tipams.

ONGC has received Mining Lease of these areas from MOPNG, Govt. of India for

exploring and producing hydrocarbons. The Mining Lease (ML) areas with their

respective validity are given below:

1. Geleki ML (Area: 27.94 sq.km, with effect from 16.08.2010 to 15.08.2030)

2. SE Geleki ML (Area: 20.5 sq.km, with effect from 30.01.2006 to 29.01.2026)

3. Mekeypore-Santak-Nazira ML (Area: 77.0 sq km, with effect from 30.01.2006

to 29.01.2026)




Lakwa Mining Lease (ML) contains important oil producing fields of ONGC situated

in Sibsagar District of Assam. The area of this lease is 172.49 square kilometers.

This ML area forms the part of North Assam shelf and has been producing


ML has been obtained with effect from 29.09.2008 and is valid upto 28.09.2028.

So far, 681 numbers of wells (including exploratory and development wells) have

been drilled in this mining lease with depths ranging from 2259 m to as deep as

5113 m.

The area has undulating terrain with tea gardens. Elevation of the block varies

from 101 m to 104 m. Index Map is shown in Figure-1.1. The block coordinates

are given in Table-1.1. Tentative well coordinates are as given in Table-1.2.

TABLE-1.1

BLOCK COORDINATES

Sr. No ML Name Boundary

Points

Well Coordinates (WGS-84)

Latitude Longitude

1 Geleki ML (27.94 sq.km)

I 2604920.06 9404406.54

Z 2604911.88 9404143.98

Y 2604750.92 9404028.25

U 2604637.32 9404014.88

V 2604625.87 9404135.07

W 2604646.31 9404415.45

2 SE Geleki ML (20.5 sq.km)

A 2604614.8 940390.00 B 2604415.0 940390.00 C 2604400.0 940400.00 D 2604415 940410.00 E 2604515 940430.00 F 2604636.72 940430.00 G 2604631.59 9404219.62 H 2604543.24 9404056.71 I 2604537.5 9403930.71 J 2604628.68 9403942.21 A 2604614.8 940390.00

3 MK-SN-NZ-ML (77.00 Sq.Km)

Part-I (12.00 Sq.km)

A 2605713.88 9404316.45 B 2605713.84 9404430.0 C 2605330.00 9404330.0 D 2605327.46 9404041.61 E 2605647.00 9404326.45 A 2605713.88 9404316.45

Part-II (57.00 Sq.km)

F 2605430.00 940470.00 G 2605230.00 940480.00 H 2604722.00 9404415 I 2604920.06 940446.54 J 2604911.88 9404143.98 K 260500.00 9404132.23 F 2605430.00 940470.00

4 Charali ML (51.63 Sq.Km)

A 2605619.90 9403935.68 B 2605622.50 94039.40.86 C 2605831.00 94039.38.86 D 2605903.57 9404322.83 E 2605647.00 9404326.45 F 2605327.46 9404041.61 G 2605310.28 9403808.36

5 Lakwa ML (172.49 Sq.Km)

A 2705957.75 9404317.57

B 2700016.00 9404541.00

C 2700112.75 9404601.29




Sr. No ML Name Boundary

Points

Well Coordinates (WGS-84)

Latitude Longitude

D 270050.00 9405433.50

E 270050.00 9405638.00

F 2700001.25 9405559.86

G 2605908.00 9405411.86

H 2605904.00 9405242.71

I 2605836.75 9405209.50

J 2605836.50 9405050.00

K 2605750.50 9404701.71

L 2605713.75 9404701.00

M 2605713.88 9404316.50

TABLE-1.2

TENTATIVE WELL LOCATIONS

Sr. No Proposed

Location

Well Coordinates (WGS-84) Nearest Village District

Latitude Longitude

1 GKBS 264544.95N 944007.07E Existing Geleki

Block

Sibsagar,

Assam

2 GKBT 264745.65N 9443 03.90E Moran Gaon, Mouza Athkhel

Sibsagar, Assam

3 MKAD 265202.73N 944626.898E Village Sundar Pukhuri Hulal gaon, Mouza - Juktoli

Sibsagar, Assam

4 NGAB 264946.03N 94440.75E Village Harkina Mouza Athkhel

Sibsagar, Assam

5 DGAJ 2658 14.69N 944634.70E

Village -Jojoli Gaon, Mouza Silakuti/Mahmora

Sibsagar, Assam

6 LKBB 270141.296N 9449 53.111E

Village Kotoky Papong Mouza - Khaloighugura

Sibsagar, Assam

7 CHAQ 265612.73N 9441 11.13E Mothiasiga, Mouza - Juktoli, Sibsagar.

Sibsagar, Assam

8 CHAR 2657 51.849N 9440 23.018E

Village Kurulakatia Mouza Meteka, Bongaon ,Sibsagar, Assam

Sibsagar, Assam

The study area map showing the block location and exploratory drilling well

locations are shown in Figure-1.2. Google map showing block area with well

locations is given in Figure-1.3. The environmental setting of the block area

falling in NAS Block area is given in Table-1.3 to Table-1.10.




FIGURE-1.1

INDEX MAP

CHAQ CHAR

DGAJ

LKBB

MKAD NGAB

NAS Block CHAQ CHAR

DGAJ

LKBB

MKAD

GKBT

GKBS

NGAB




FIGURE-1.2

TOPOGRAPHIC MAP NAS BLOCK IN SIBSAGAR DISTRICT




FIGURE-1.3

GOOGLE MAP SHOWING WELL LOCATIONS IN NAS BLOCK




TABLE-1.3

ENVIRONMENTAL SETTING OF WELL GKBS (1 KM RADIUS)

Sr. No. Particulars Details

1 Well GKBS Location Village Existing Geleki Block

Mouza Ahtkhel

District Sibsagar

State Assam

2 Well site Coordinates Latitude : 2604544.95N Longitude : 940407.07E

3 Well Site Elevation above MSL 140 m above MSL 4 Geographical location in toposheet 83 J/9 5 Nearest representative IMD station IMD Golaghat (75 km, SW)

6 India Meteorological Dept. (IMD), Data-Golaghat

Annual Mean Max Temp 32.7C

Annual Mean Min Temp 15.5C

Annual Average Rainfall 1898.8 mm

Predominant wind direction

North West

Study Period Site specific

Mean Max Temp 32.4C

Mean Min Temp 5.9C

Average Rainfall 13.6

Predominant wind direction SE

7 Present land use at the site Industrial use. Land is already under possession of ONGC. (Forest clearance obtained and letter is enclosed as Annexure-IV)

8 Nearest highway NH-61 (5.7 km, SW) 9 Nearest railway station Tuli Railway station (5.9 km, SE) 10 Nearest airport Jorhat (50 km, WSW) 11 Nearest river Deopani nadi & Jhansi river (7.1 km, SW) 12 Nearest town Sibsagar (25 km, NNW) 13 Nearest major town with 2,00,000

population

NIL

14 Villages within 1 km radius NIL 15 Hills/valleys NIL 16 Nearest tourist place NIL 17 Archaeologically important places NIL 18 Protected areas as per Wildlife

Protection Act,1972 (Tiger reserve, Elephant reserve, Biospheres, National parks, Wildlife sanctuaries, community reserves and conservation reserves)

NIL

19 Reserved / Protected Forests Geleki RF 20 Seismicity Zone-V as per IS 1983 (Part-1) 2002

Note: All distances mentioned above are aerial distances

Source: Topo sheet No: 83 J/9, Google image and field visits




TABLE-1.4

ENVIRONMENTAL SETTING OF WELL GKBT (1-KM RADIUS)


1 Well GKBT Location Village Moran Gaon

Mouza Athkhel

District Sibsagar

State Assam

2

Well site Coordinates Latitude : 26o4745.65N

longitude : 94o4303.90E 3 Well Site Elevation above MSL 100 m above MSL 4 Geographical location in

toposheet 83 J/9

5 Nearest representative IMD station

Golaghat (80.7 km, SW)

6 India Meteorological Dept. (IMD), Data- Golaghat





North West

Study Period - Site specific

Mean Max Temp 32.4C

Mean Min Temp 5.9C



SE

7 Present land use at the site Single crop agricultural land 8 Nearest highway NH-61 (12.1 km, SW) 9 Nearest railway station Nemtiah Railway Station (10.8, NW) 10 Nearest airport Jorhat (54.6, WSW) 11 Nearest rivers Jhanzi river (12.2 km, SW) 12 Nearest town Sibsagar (22.6, NNW) 13 Nearest major town with

2,00,000 population Sibsagar (22.6, NNW)

14 Villages within 1 km radius Marangaon (0.9 km, NE) 15 Hills/valleys NIL 16 Nearest tourist place NIL 17 Archaeologically important places NIL 18 Protected areas as per Wildlife

Protection Act,1972 (Tiger reserve, Elephant reserve,

Biospheres, National parks,

Wildlife sanctuaries, community reserves and conservation reserves)

19 Reserved / Protected Forests NIL 20 Seismicity Zone-V as per IS 1983 (Part-1) 2002






TABLE-1.5

ENVIRONMENTAL SETTING OF WELL MKAD (1 KM RADIUS)


1 Well MKAD Location Village Sundar Pukhuri Hulal gaon

Mouza Juktoli

District Sibsagar

State Assam

2 Well site Coordinates Latitude : 26o5202.73N Longitude : 94o4626.898E

3 Well Site Elevation above MSL 100 m above MSL 4 Geographical location in toposheet 83 J/13 5 Nearest representative IMD station Golaghat (90 km, SW)


Annual Mean Max Temp 32.7 C

Annual Mean Min Temp 15.5 C



North West


Mean Max Temp 32.4C

Mean Min Temp 5.9C



SE

7 Present land use at the site Single crop rain fed agricultural land 8 Nearest highway SH-1 (6.6 km, NW) 9 Nearest railway station Santak RS (1.5 km, ENE) 10 Nearest airport Jorhat (62 km, WSW) 11 Nearest river Dikhu river (Adjacent) 12 Nearest town Sibsagar (18.8, NW) 13 Nearest major town with 2,00,000

population Sibsagar (18.8, NW)

14 Villages within 1 km radius Sundar Pukhuri (0.6, W) 15 Hills/valleys NIL 16 Nearest tourist place NIL 17 Archaeologically important places NIL 18 Protected areas as per Wildlife

Protection Act,1972 (Tiger reserve, Elephant reserve, Biospheres, National parks, Wildlife sanctuaries, community reserves

and conservation reserves)

NIL







TABLE-1.6

ENVIRONMENTAL SETTING OF WELL NGAB (1-KM RADIUS)


1 Well NGAB Location Village Harkina Gaon

Mouza Athkhel

District Sibsagar

State Assam

2

Well site Coordinates Latitude : 26o4946.03N

Longitude : 94o440.75E

3 Well Site Elevation above MSL 105 m above MSL 4 Geographical location in

toposheet 83J/9




Annual Mean Max Temp 32.7 C




North West


Mean Max Temp 32.4C

Mean Min Temp 5.9C



SE

7 Present land use at the site Single crop agricultural land 8 Nearest highway SH-1 (7.4 km, NNW) 9 Nearest railway station Mezanga Railway station (7.5 km, NNW) 10 Nearest airport Jorhat (56.7 km, WSW) 11 Nearest rivers Namdang Nadi (1.3, W) 12 Nearest town Sibsagar (20 km, NNW) 13 Nearest city Sibsagar (20 km, NNW) 14 Nearest major town with

2,00,000 population Sibsagar (20 km, NNW)

15 Villages within 1 km radius Hari kinagaon (0.6 km, NW) 16 Hills/valleys NIL 17 Nearest tourist place NIL 18 Archaeologically important places NIL 19 Protected areas as per Wildlife

Protection Act,1972 (Tiger

reserve, Elephant reserve, Biospheres, National parks, Wildlife sanctuaries, community reserves and conservation reserves)

NIL


Note: All distances mentioned above are aerial distances Source: Topo sheet No: 83 J/9, Google image and field visits




TABLE-1.7

ENVIRONMENTAL SETTING OF WELL DGAJ (1 KM RADIUS)


1 Well DGAJ Location Village Jijoli Gaon

Mouza Silakuti/ Mahmora

District Sib sagar

State Assam

2

Well site Coordinates Latitude : 2658 14.69 N

Lognitude : 944634.70 E 3 Well Site Elevation above MSL 100 m above MSL 4 Geographical location in

toposheet 83 I/16







Predominant wind direction North West


Mean Max Temp 32.4C

Mean Min Temp 5.9C



7 Present land use at the site Single crop agricultural land 8 Nearest highway SH-1 (7.3 km, SSW) 9 Nearest railway station Mahutgaon railway station (2.2 km, ESE) 10 Nearest airport Jorhat 11 Nearest rivers Disang river (1.1 km, N) 12 Nearest town Sibsagar (12.5 km, W) 13 Nearest city Sibsagar (12.5 km, W) 14 Nearest major town with

2,00,000 population Sibsagar (12.5 km, W)

15 Villages within 1 km radius Dhitaj Pukhuri (0.5 km, E) 16 Hills/valleys NIL 17 Nearest tourist place NIL 18 Archaeologically important places NIL 19 Protected areas as per Wildlife

Protection Act,1972 (Tiger reserve, Elephant reserve, Biospheres, National parks,

Wildlife sanctuaries, community reserves and conservation reserves)

NIL







TABLE-1.8

ENVIRONMENTAL SETTING OF WELL LKBB (1 KM RADIUS)


1 Well LKBB Location Village Kotoky Papong

Mouza Khaloighugura

District Sibsagar

State Assam

2 Well site Coordinates Latitude : 270141.296N Lognitude : 9449 53.111E

3 Well Site Elevation above MSL 101 m above MSL 4 Geographical location in toposheet 83 I/16 5 Nearest representative IMD station Golaghat (103 km, SW)






North West


Mean Max Temp 32.4C

Mean Min Temp 5.9C



SE

7 Present land use at the site Plantation 8 Nearest highway NH-37 (14.2 km, NW) 9 Nearest railway station Lakwa railway station (2.8 km, SSE) 10 Nearest airport Jorhat (73.4 km, SW) 11 Nearest river Disang river (1.2 km, SE) 12 Nearest town Sibsagar (20 km, SW) 13 Nearest major town with 2,00,000

population Sibsagar (20 km, SW)

14 Villages within 1 km radius Bareogoan (0.7 Km, SW) 15 Hills/valleys NIL 16 Nearest tourist place NIL 17 Archaeologically important places NIL 18 Protected areas as per Wildlife

Protection Act,1972 (Tiger reserve, Elephant reserve, Biospheres, National parks, Wildlife sanctuaries, community reserves

and conservation reserves)

NIL







TABLE-1.9

ENVIRONMENTAL SETTING OF WELL CHAQ (1 KM RADIUS)


1 Well CHAQ Location Village Mothiasiga

Mouza Juktoli

District Sibsagar

State Assam

2

Well site Coordinates Latitude : 265612.73N

Longitude : 9441 11.13E


toposheet 83 J/9









Mean Max Temp 32.4C

Mean Min Temp 5.9C



7 Present land use at the site Single crop agricultural land 8 Nearest highway NH-37 (8.2 km, NNW)

SH-1 (4.8 km, SE)

9 Nearest railway station Nazira railway station (4.8 km, SE) 10 Nearest airport Jorhat (55.1 km, SW) 11 Nearest rivers Dikhu river (1.9 km, NE) 12 Nearest town Sibsagar (7.6 km, NNW) 13 Nearest city Sibsagar (7.6 km, NNW) 14 Nearest major town with

2,00,000 population

Sibsagar (7.6 km, NNW)

15 Villages within 1 km radius Mothiasiga Gahairgoan (0.5 km, NE) 16 Hills/valleys NIL 17 Nearest tourist place NIL 18 Archaeologically important places NIL 19 Protected areas as per Wildlife

Protection Act,1972 (Tiger reserve, Elephant reserve,

Biospheres, National parks, Wildlife sanctuaries, community reserves and conservation reserves)

NIL







TABLE-1.10

ENVIRONMENTAL SETTING OF WELL CHAR (1 KM RADIUS)


1 Well CHAR Location Village Kurulakatia

Mouza Meteka, Bongaon

District Sibsagar

State Assam

2

Well site Coordinates Latitude 2657 51.849N Lognitude - 9440 23.018E


toposheet 83 J/9









Mean Max Temp 32.4C

Mean Min Temp 5.9C



7 Present land use at the site Single crop agricultural land 8 Nearest highway NH-37 (4.6 km, NW)

SH-1 (8.3 km, SSE)

9 Nearest railway station Sibsagar railway station (4.2 km, NW) 10 Nearest airport Jorhat (55.6 km, SW) 11 Nearest rivers Dikhu river (0.4 km, E) 12 Nearest town Sibasagar (4.1 km, NW) 13 Nearest city Sibasagar (4.1 km, NW) 14 Nearest major town with

2,00,000 population Sibasagar (4.1 km, NW)

15 Villages within 1 km radius Maj Haloagaon (0.8 km, W) 16 Hills/valleys NIL 17 Nearest tourist place NIL 18 Archaeologically important places NIL 19 Protected areas as per Wildlife

Protection Act, 1972 (Tiger reserve, Elephant reserve,

Biospheres, National parks, Wildlife sanctuaries, community reserves and conservation

reserves)

NIL







1.3.4 Importance of the Project

Total crude oil import for FY 2014-15 was 189.43 MMT almost same as the

imports during FY 2013-14 (189.24 MMT; increase of 0.1%. However, import of

petroleum products (20.28 MMT) increased by 21 percent, mainly on account of

increase in import of LPG (26%), MS (58%), HSD (35%), Bitumen (80%), and

other products like - Aviation gas, Pet Coke (33%), etc.

Petroleum products export declined for the first time in last 15 years; registering

a decline of 6.2 percent mainly on account of decline in export of Naphtha, Fuel

oil, Bitumen, etc.

With total import (crude and petroleum products) combined with total products

export of 63.66 MMT translates to net import volume of 146 MMT for FY 2014-15.

Net import bill for crude oil during FY 2014-15 was 6,873.50 billion (US$ 112.75

billion) against 8,648.75 billion (US$ 142.96 billion) during FY 2013-14 a

decrease of 20.5 per cent in terms of the Indian Rupee and decrease of 21.13 per

cent in dollar value mainly on account of lower crude oil prices in the international

market.

Energy security has become one of the top three goals of the Indian

Government. The Indian Government is encouraging exploration and production

of oil and gas to a great extent. This would primarily allow India to tap its own

resources there by reducing its import bill.

Discovery of viable hydrocarbon reserves in the state can boost the states

economic development to a great extent. It would also catalyse influx of

industries in the stat

Documents

ENVIRONMENTAL IMPACT ASSESSMENT STUDIESenvironmentclearance.nic.in/writereaddata/EIA/07122016OQXF94QFeia.pdf · 1.8 Environmental Setting of Well LKBB (1 Km Radius) C1-13 1.9 Environmental