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OIL AND NATURAL GAS CORPORATION LIMITED

EIA for the Development of Vashishta and S-1 Fields of KG Offshore,

Expansion of Odalarevu Onshore Terminal and Installation of Sub-Sea

Pipeline, East Godavari District, Andhra Pradesh

Executive Summary - Final

DECEMBER 2013

Asian Consulting Engineers Private Limited, New Delhi

EIA report for Development of Vashishta and S-1 fields, expansion of

Odalarevu onshore processing terminal and installation of dual 14” sub-sea pipeline

Asian Consulting Engineers Pvt. Ltd. 1

EXECUTIVE SUMMARY

1. INTRODUCTION

Project Highlights

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

major National Oil Company, 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 intends to drill and complete four wells in Vashishta and S-1 fields off the East Coast of

India. The approximate distance of Vashishta and S-1 fields from Amalapuram coast is 26 to 35

km. As the development of these fields entails the entire spectrum of activities from drilling to

production and setting up of facilities, various options were analyzed by internationally reputed

integrated consultant (M/s Pegasus International) for each of the major components of the

facilities i.e. Drilling & Completion, Subsea System & Controls, Well Fluid Pipelines (offshore

& onshore) up to Onshore Terminal at Odalarevu and Onshore Terminal Facilities and the

development scheme / field development plan was firmed up.

Based on the details of the CAPEX (accuracy +25%) indicated by the Integrated Consultant in its

report, the total capital cost of the project (including marine survey, consultancy, PMC, TPI,

service tax, etc.) for the development of Vashishta and S-1 fields works (including expansion of

onshore terminal and installation of dual sub-sea pipeline) out to be USD 724.93 million

(inclusive of survey and project management/consultancy services). Based on the aggregated

OPEX per annum estimated by Integrated Consultant, the operating expenditure including

service tax has been worked out as USD 18.03 million per annum.

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.

As TOR for expansion of existing Onshore Terminal, also includes studies to be conducted in

respect of offshore drilling and laying of Pipelines from Offshore to Onshore Terminal, the report

contains three volumes (Vol-I, Vol-II and Vol-III), each catering to expansion of onshore

terminal, offshore drilling and pipeline laying respectively.

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

terrestrial, marine 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-

No. J-11011/591/2012-IA II (I) dated 4th June, 2012.




2. PROJECT DESCRIPTION

ONGC intends to drill & complete two wells in Vashishta field and re-enter & complete two

wells in S-1 field off the East coast of India in water depths ranging between 250-700m. As part

of development of these fields, ONGC also plans to develop following facilities:

a) Sub-sea tieback of these 4 wells to shore with 14” dual pipeline through a daisy chain

architecture, with suitable sub-sea facilities including subsea control units and umbilical.

b) Expansion of onshore terminal at Odalarevu to handle VA & S-1 well fluids, along with

sharing some of the facilities of G-1 and GS-15 terminal which is under construction.

The salient features of the project have been summarized in the following table:

Name of the Project : Integrated Development of Vashishta & S1 fields - drilling

& completion of four wells in Vashishta & S-1 fields,

installation of dual sub-sea pipeline and expansion of

onshore terminal at Odalarevu

Location / site alternatives

under consideration : Vashishta and S-1 fields, KG Offshore, East Godavari

district, Andhra Pradesh

Number of Existing Wells Five wells (G1-9, G1-10, G1-11, G1-DA, G1-DB)

Total number of proposed

Production Wells : 4 wells - VA-DA, VA-DB, SI-A and S1-B

Type of hydrocarbon

expected : Gas

Expected hydrocarbon gain : Average daily gas rate of 5.75 MMSCMD (for a period of

five years) has been envisaged from Vashishta and S-1

Field. The cumulative gas production at the end of nine

years is expected to be close to 15.775 BCM.

Target Depth of the drilling

wells : 2200 m True Vertical Depth Subsea

Type of the rig to be used : Semi-submersible Drilling Rig/ Drillship

Proposed Drilling Fluid for

each well : Water-based drilling fluid system

Anticipated Volume of Drill

Cuttings for each well : 300 - 400 m

3

Existing Pipeline Facility Dual 10 inch sub-sea pipeline to evacuate production fluid

from G-1 and G-15 fields to existing onshore terminal.

Length: 25 km approx.

Proposed Pipeline Facility : Dual 14 inch sub-sea pipeline to evacuate production

fluid from Vashishta and S-1 Fields to Proposed

Onshore Terminal.

Length: 45 km approx.

Onshore section of pipeline is approx. 4km

Existing Terminal Capacity

(Under Construction) : 2.75 MMSCMD of gas & 1500 m³/d of crude

Proposed Capacity of the

Terminal after expansion : 7.25 MMSCMD of gas & 1500 m³/d of crude

Expected Cost of the Project : $724.93Million (INR 3407.17 crores @Rs. 47/$)




3. DESCRIPTION OF THE ENVIRONMENT

The study area comprises of both terrestrial and marine environment. The S-1 and Vashishta field

falls in the Bay of Bengal off the eastern coast and the onshore terminal at Odalarevu is proposed

to be expanded. The 14 inch dual subsea pipeline will evacuate the well fluids (mainly gas) from

wells to the onshore terminal. The existing/ baseline environmental set-up of the study area has

been studied during the months of September to November as described in following sub-

headings.

Geology & Topography

Geologically the area is characterized by major NE-SW trending fault within Mio-Pliocene

sequences. The northern boundary of the fault is same extension of Ponnamanda- Adavipalem

fault. The onshore area is mostly surrounded by agricultural fields with general elevation of the

study area about 10 to 15 m amsl.

Seismic Consideration

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

the seismic zones of India.

Climate and Meteorology

The climate is mainly governed by the presence of Bay of Bengal. The climate of the area is

moderate and humid and the temperature ranges from 21 to 38 °C. The study area receives

rainfall from the south-west as well as north-east monsoon. As per the agro-climatic zones of

Andhra Pradesh, the study area falls in Godavari Zone.

The average wind pattern shows predominant winds blowing from SW and NE. The calm wind

(wind speed < 3.39 m/s) conditions prevailed for 3.80 % of the total time.

Bathymetry and Sea-bed topography

The proposed wells in S-1 and Vashishta field have water depth varying in the range between

250-700m. The continental shelf has a regular bathymetry with isobaths running parallel to the

coast.

Waves & Tides

The maximum wave height (Hmax) in the area varied between 0.45 m to 4.40 m and the

significant wave height (Hs) varied between 0.3 to 2.8 m at 90 m of water depth. The tides in this

region are characterized as predominantly semi-diurnal.

Depressions & Cyclones

The study area due to its, physio-graphic and climatic conditions is one of the most disaster prone

areas as it is vulnerable to windstorms and frequent severe cyclonic storms, which originates in

the Bay of Bengal as low pressure zones.

Circulation

The dynamics of circulation near the study area is plain and even. During high tide the sea water

enters the coastal plain and thereby the salinity level increases on the adjacent area. Casurina

plantations are present for certain stretch of this coastline.




Land Use

The land use within the study area has been studied and it can be broadly classified into seven

major categories viz., plantation, mangrove, water, agriculture, aquaculture, fallow land and built

up land. The land use distribution of the study area is given below in Table 1.

Table 1: Land use distribution of the Study Area

S. No. Land use Area (sq km) Percentage

1 Plantation 59.68 31.11

2 Mangrove 1.03 0.54

3 Water 13.61 7.09

4 Agriculture 52.93 27.59

5 Aquaculture 56.65 29.53

6 Built Up 3.36 1.75

7 Fallow Land 4.57 2.38

Total 191.81 100

Land Subsidence

A writ petition filed by Krishna Godavari Delta Parirakshana Samithi, Bhimavaram, an NGO, on

the issue of land subsidence in the Krishna-Godavari region due to exploration activities. Based

on that writ petition, MoEF constitute Sub-Committee to study the subsidence issue in the region.

The findings of this committee and the survey results of ground level measurement conducted by

ONGC in the year of 2008 & 2009 revealed that the basin is not prone to land subsidence.

Marine Environment

Water Quality: Water Quality monitoring has been carried out at 13 sampling locations along the

proposed pipeline route and wells location in Vashishta and S-1 fields. The sampling and

analysis of water were carried out as per standards of IS: 3025 and APHA. It is observed that

from analyzed data that PAHs, oil & grease and heavy metals, namely mercury, chromium, lead,

cadmium, aluminum, copper and chromium were below the detectable limit in all the sampling

locations. Only Iron as heavy metals were detectable, which was in the range of 0.18 to 2.56

mg/l. As physico-chemical characteristic of water, turbidity of water were below detectable limit

in all the samples. The observed value of pH varied in the range of 6.83 to 7.92. The salinity in

the study area varies in the range of 35890 to 39510 mg/l. The alkalinity, BOD and COD varied

in the range of 281 to 392, 3.7 to 6.2 and 9.1 to 13.5 mg/l respectively. The total hardness of

water in all the sample is in the range of 5852 to 6672 mg/L. The concentrations of Chloride and

Fluoride in all the sample were in the range of 9547 to 19796 mg/L and 1.76 to 2.89 mg/L

respectively.

Sediment Quality: Sediments Quality monitoring has been carried out at 10 sampling locations

in water depth ranging between 9.9 to 243 meters. The sampling and analysis of water were

carried out as per standards of IS: 2720 and USEPA. It is observed that sediments are loam along

the sampling locations. The pH of the sediments varies in narrow range of 7.18 to 8.12. The

value of EC is in the range of 515 to 1121 µS/cm. The content of total phosphorous, potassium

and total khejdal nitrogen varied in the range of 6.08 to 8.29 mg/100g, 3.8 to 6.1 mg/100g and

0.1 to 0.92 % respectively. The concentrations of heavy metals namely, Cadmium, Chromium,

lead, Nickel and Aluminum are found to be below detectable limit in all sampling locations. The




content of Iron and Zinc were in the range of 7.6 to 12.87 and 5.9 to 9.33mg/100 gm of soil

respectively.

Biological Characteristics: In view of wide variations in biological production in a marine

ecosystem, the biological parameters considered for the present evaluation are phytoplankton

(pigments, population and dominant genera), zooplankton (biomass, population and faunal

groups), macro benthos (biomass, population and faunal groups), status of mangroves, seaweeds

and sea grasses, corals, fishery, marine reptiles, mammals and birds. The phyto-planktons &

zooplanktons samples were collected at 13 locations and benthos samples collected at 10

locations. The analysis of diversity of species is based on Shannon’s Diversity Index. The

observed diversity index of phytoplankton, zooplankton and benthos varied in the range of 3.1 to

4.7, 194 to 410, 1.74 to 4.6, 101 to 302 and 1.02 to 1.57, 95 to 253 respectively. The observed

density of phytoplankton, zooplankton and benthos varied in the range of 194 to 410, 101 to 302

and 95 to 253 individual/litre respectively. The observed chlorophyll content varies in the study

area from range of 0.310 to 5.146 mg/m3. The region is endowed with rich Marine inland and

Brackish Water Fishery Resources, the most important fish species found in the area

Elasmobrabches , clupeids , Peachis , Flat Fishes , Drift fishes , Pomfrets Carangids , Mackerals ,

Seerfishes , Neritic Tunas , Oceanic Tunas , Marlins , other Pealagic fishes , Deep sea fishes ,

Misc. fishes ,shrimp (littoral) , shrimp (deep sea) apart from these lobsters (littoral) , bivalves &

gastropods , cephalopods , marine mammals also found in the study area.

Terrestrial Environment

Soil Quality: Ten 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 is observed from

the analyzed data that the soil of the study area is sandy loam in nature. The pH varied in the

range of 6.94 to 8.24. Electrical conductivity was in the range of 495 to 1070 µS/cm. The organic

carbon and total khejdal nitrogen in the soil varies in the range of 0.64 to 1.14 % and 0.83 to 0.97

% respectively. The available phosphorous, potassium, magnesium, calcium and sodium in the

range of 5.22 to 8.02, 4.6 to 8.0, 27.8 to 52.3, 154 to 269.7 and 11.8 to 18.9 mg/100 gm

respectively. The cation exchanged ration (CEC) was in the range of 0.73 to 0.99 meq/100g.

Water Quality: The sampling and analysis of water carried out as per standards of IS: 3025.

Five surface water samples were collected from different places within the study area. From the

surface water quality data it is observed that all the parameters have been found within the

prescribed standards as per IS: 10500:1993.

Seven ground water samples were collected from different places within the study area. It is

observed from the analyzed data that TDS and hardness of water is higher than the desirable

limits of IS: 10500:1993. The other parameters have been found to be within the limits as per

standards.

Air Quality: Air quality was monitored at eight different locations within the study area.

Analysis was conducted for Particulate Matter (PM10 & PM2.5), Sulphur Dioxide (SO2) and

Oxides of Nitrogen (NOx) for the duration of five weeks. Besides these, Hydrocarbon (Methane

& Non-Methane) and Volatile Organic Compounds (VOCs) were also monitored at five

locations. The 24-hourly average of PM10 and PM2.5 levels varied station wise between 48.4

μg/m3 – 95.3 μg/m3

and 24.5 μg/m3 – 46.0 μg/m3 respectively. The 24-hourly average values of

SO2 varied between 2.8 µg/m3

and 3.9 µg/m3 while the 24-hourly average NOx level measured in

the study area ranged between 4.3 µg/m3 and 6.2 µg/m

3. The analytical result of value reveals




that the concentrations of PM10, PM2.5, SO2 and NOx were found within the prescribed standard

limits at all the monitoring locations. The concentration of methane and non-methane

hydrocarbons varied between 0.32 to 0.1.20 and 0.25 to 0.95 ppm; whereas VOCs were found to

be below detectable limit.

Noise Quality: Ambient noise intensity at 13 locations within the study area has been collected.

Eleven locations are under residential rural areas within the study area; whereas two location

near to proposed project site. 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 were found (from N1

to N10 station locations) ranging between 48.6-54.5 dB (A) at day time and 38.1-46.2 dB (A) at

night time . The value of noise at N1, N2 and N10 stations were found to be slightly above the

permissible limit due to cultural programmes taking place at night time. On the other hand, noise

level at proposed onshore terminal and pipeline route is found to be within the permissible limit

at day and night time. The noise level at existing facility entrance gate and pipeline route were

found 56.1 dB (A) and 43.6 dB (A) at day time respectively, whereas 48.5 dB (A) and 36.5 dB

(A) at night time.

Biological Characteristics: The study area supports varied habitats viz. agricultural fields,

aquaculture fields and human settlements. There are no eco-sensitive or forest areas or wildlife

sanctuaries within the study area.

A total of 272 flora species have been observed in the area. This includes 184 species of trees, 47

species of shrubs and 41 species of climbers. From all the species observed in the area,

Casuarina equisetifolia, Rhizophora mucronata and Grewia populifolia are very common.

The study area is dominated by domestic animals. The most common fauna species observed in

the study are house crow, crane, black headed cuckoo, rat snake and pigeon.

Socio-Economic Environment

The socio-economic profile of the study area is based on Census of India data (2001). 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 area includes five mandals namely,

Allavaram, Mamidikuduru, Malikipuram, Razole and Uppalaguptam. A total of 38 habitations

under 19 revenue villages falls within the study area, which are given in Table 2.

Table 2: Revenue villages and Habitations within the Study Area

Mandals Revenue Villages Habitations

Allavaram

Allavaram 1. Allavaram

Bendamurulanka

2. Rebbanapalli

3. Vodalarevu

4. Bendamurlanka

Devaguptam

5. D.Ravulapalem

6. Gundipudi

7. Devaguptam

Godi

8. Godipalem

9. Godithippa

10. Gopailanka

11. Godi




Mandals Revenue Villages Habitations

Godilanka 12. Godilanka

Komaragiripatnam

13. Lakshmaneswaram

14. Rameswaram

15. Thummalapalle

16. Komaragiripatnam

Mogallamuru

17. Rebabanapalli Peta

18. Sirigatlapalle

19. Mogallamuru

Rellugadda 20. Veluvalalanka

21. Rellugadda

Samanthakuru

22. Adiandhra Peta

23. Pallipalem

24. Samanthakuru

Thurupulanka 25. Thurupulanka

Mamidikuduru

Adurru 26. Adurru

27. Moripalem

Gogannamattam 28. Karavaka

Lutukurru 29. Lutukurru

Magatapalle 30. Magatapalle

Makanapalem 31. Makanapalem

Malikipuram Kesanapalle 32. Kesanapalli

33. Turpupalem

Razole

Mulikipalle 34. Mulikipalle

Ponnamanda

35. Giduguvaripalem

36. Merkapalem

37. Ponnamanda

Uppalaguptam T.Challapalle 38. T. Challapalle

The total population of 19 revenue villages was 1, 07,878 out of which males are 54,230 and

females are 53,648 (as per Census, 2001).

4. ANTICIPATED ENVIRONMENT IMPACTS AND MITIGATION MEASURES

The proposed project of drilling and completion of wells, expansion of onshore terminal and

installation of offshore & onshore pipeline includes the following activities during construction

and operation phase:

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

Drilling Operations (deployment of rigs, etc)

Atmospheric emissions (gas flaring, vehicular/vessels emissions, etc)

Operational discharges

Noise levels

Solid/Wastewater/Hazardous waste generation

Use of resources such as water requirement for construction activities & other operations

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

Transport of personnel and materials

Fuel storage and handling

Socio-economic Impacts




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 during construction as well as operation phase.

However, the impacts during the construction phase shall be temporary, restricted to the

construction site and adoption of suitable measures (such as routine maintenance of the

vehicles/vessels/machineries, etc); whereas impacts during the 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, installation of WHRU to reduce the

temperature of gas turbine generators, 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/vessels

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 construction phase and

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

use of noise attenuation devices, shall minimize the impacts in construction as well as in

operation phase.

Water Quality

The water quality of onshore and offshore area is likely to get affected due to installation of

pipeline, operational & domestic discharges, hydraulic testing of pipeline and accidental spillage

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

machineries. However, these impacts shall be minimize by adopting precautionary and suitable

measures such as installation of sewage and effluent treatment plant, utilization of produced

water, etc.

Sediments and Soil Quality

The quality of sediments and 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

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

plan.

CRZ

The pipeline route falls in Coastal regulation zone. Impacts on shoreline may occur during the

site preparation (laying of pipeline, etc), operational discharges and accidental spillage of

lubricants and other chemicals during construction and operation phase. However, these impacts

shall be mitigated by adopting suitable measures.




Biological and Marine Environment

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 construction 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).

Marine Environment: The marine species is likely to get affected due to movement of vessels,

noise generation from machineries & equipments, operation discharges, deployment of rigs &

other sub-sea infrastructure and accidental spillage of oil & other chemicals. However, these

impacts shall be minimize by adopting of suitable measures (such as waste management plan,

etc).

Socio-Economic Environment

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

installation of pipeline, movement of vehicles, operation of generators, compressors and other

machineries & equipments, gas flaring activities, etc) during construction and operation phase.

However, these impacts shall be mitigated by adopting suitable measures such as waste

management plan, special flare tip design for effective combustion, etc.

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 of drilling & completion of wells, expansion of onshore terminal and

installation of offshore & onshore pipeline. The Monitoring program is given in the following

sections.

Expansion of Onshore Terminal

Construction & Operational Phase

Ambient Air Quality: Monitoring of PM10, PM2.5, SO2 and NOx once in a week at project site and

three locations within the study area; whereas monitoring of hydrocarbons, VOC, PM10, PM2.5,

SO2 and NOx once in each season at project site and three locations.

Water Quality: Monthly analysis of pH, conductivity, TSS, TDS, heavy metals, BOD, COD, and

Oil & Grease etc, at surface and ground water sources at project location during construction

phase; whereas seasonal analysis at surface and ground water sources at project and five

locations within 10 km project site during the operation phase.

Noise levels: Noise monitoring on daily basis and maintenance of machineries shall be carried

out once in week during the construction phase. Seasonal monitoring carried out during the

operational phase at project site and other three locations around the project site.

Soil Quality: The analysis of pH, Electrical Conductivity, Moisture content, Texture, Organic

matter, nitrogen, phosphorous, potassium Oil & grease and Heavy metals on monthly basis in

construction phases and seasonal basis in operational phase at project site.




Effluent from treatment Plant: Monitor the pH, Oil and Grease and TSS before and after the

treatment on daily basis at the outlet and inlet of plant.

Flora and Fauna: Seasonal survey shall be carried out to monitor any visible changes in

biological environment near and around the project site during the operational phase.

Drilling & Completion of wells

Drilling Operation Phase and Post Drilling & Well Completion

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

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

Water Quality: The analysis of pH, conductivity, TSS, TDS, heavy metals, BOD, COD, Oil &

Grease etc are to be monitored where water up to 1Km radius from project site, once during

drilling operation phase.

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

during the well completion at project site.

Sediments Quality: The analysis of Texture, Organic matter, Nitrogen, Phosphorous, oil &

grease and Heavy Metal Concentration at the project site during the end of the drilling operation

& well completion.

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.

Installation of Offshore and Onshore Pipeline

Site Preparation & Installation of Pipeline

Water Quality: The analysis of pH, conductivity, TSS, TDS, heavy metals, BOD, COD, Oil &

Grease, etc on monthly basis at surface & ground water sources at and nearby project site and

marine watery quality at every 3 km stretch along the offshore pipeline and locations within 1km

radius of the pipeline.

Noise Quality: Hourly-based noise level monitoring and maintenance of machineries may be

done once in a week.

Soil Quality: Monthly based analysis of pH, Electrical Conductivity, moisture content, Texture,

oil & grease and Organic matter at onshore project site.

Sediments Quality: The analysis of Texture, Organic matter, Nitrogen, Phosphorous, oil &

grease and Heavy metal concentration on monthly basis during the construction phase and once

in a year during the operational phase carried out at offshore project site.

The post operational monitoring program will be under the supervision of the ONGC and the

monitoring shall get carried out by recognized laboratories/ institutions/by ONGC.

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 of drilling operations, expansion of onshore terminal and installation of pipeline:

Blowout

Oil Spills

H2S Emissions

Collision involving drill ships

Helicopter Crashes

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. Onshore and offshore facility 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:

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 gas 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, drilling & completion of wells in Vashishta & S-1 field,

expansion of onshore terminal and installation of offshore & onshore pipeline. The relevant

mitigation measures are proposed for the following environment issues.Site Acquisition




Rig Mobilization

Vessel mobilization for offshore

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)

Sediments and 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 rules and Factories Act 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. The primary responsibility for providing training to all project personnel

will be that of the HSE Officer, ONGC.

9. SUMMARY AND CONCLUSION

ONGC plans to develop Vashishta and S-1 fields off the east coast of India. As part of the

development of these fields, ONGC will carry out drilling and completion of 4 wells, expansion

of onshore processing facility and installation of offshore and onshore pipeline at Odalarevu,

East Godavari district of Andhra Pradesh.

Before starting these operations ONGC has carried out out EIA studies for identification of

impacts based on the analyzed data (collection from primary and secondary sources) and

suggested mitigation measures for minimizing any environmental impact due to the project

operations. Impacts due to operation of machineries and equipments, operational discharges,

accidental spillage of lubricants, oil and other chemicals, movement of vehicles/vessels, gas

flaring activities, etc during construction and operational phase may affect the terrestrial and

marine 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/EI/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.

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