Phone:-022 61148430 .... Implementation of Environment Management System (ISO 14000) ..... The project site and its vici
Final Environment Impact Assessment Report for
The Proposed Modernisation of Existing Unit #6 (500 MW) by change of fuel at
Trombay Thermal Power Station
Final Report for Environmental Clearance
Project Proponent Tata Power Company Limited Mahul, Chembur, Mumbai – 400 074 Prepared By
April 2013
Declaration by Experts contributing to the EIA for Proposed Modernisation of Existing Unit # 6 (500 MW) by change of fuel. I, hereby, certify that I was a part of the EIA team in the following capacity that developed the above EIA. EIA Coordinator: Thermal Power Plant Name: Mr. J.L. Thakker Signature & Date: Period of involvement: Throughout the EIA study Contact information:
[email protected] Phone:-022 61148430 Functional Area Experts: S. No.
Functional Areas
Name of the expert/s
1
Involvement (Period & Task**) Throughout the EIA study
AP*
Mr. J L Thakker & Dr Jyoti Prabha
2
1. Baseline study (marking of monitoring location) 2. Review baseline data 3. Impact assessment and Management plan Throughout the EIA study
WP*
3 SHW*
Mr. Ashish Deshpande & Mr. Atul Kumar Soni.
Dr. Alok Kumar & Mr. J. L. Thakker
4
1. Baseline study (marking of monitoring location) 2. Review baseline data 3. Review of existing and proposed water balance 4. Impact assessment and Management plan Throughout the EIA study 1. Baseline data collection 2. Impact assessment Throughout the EIA study
SE*
Mrs . Mamta Bavaskar.
1. Review of Demographic Characteristics, 2. CSR Activities, 3. Impact Assessment, 4. Management Plan
Signature & Date
S. No.
Functional Areas
Involvement
Name of the expert/s
5
(Period & Task**) Throughout the EIA study
EB*
Dr. Alok Kumar
Geo*
Mr. Sanjeev Gupta
6
7
1. Data collection 2. Impact assessment and report preparation During report compilation 1. Review of baseline data 2. Impact assessment Throughout the EIA study
Mr. Shrikant Patil. And AQ*
Dr Jyoti Prabha
8
1. Location of baseline data collection 2. Review of baseline monitoring report. Also supervision of monitoring work 3. Air quality modelling 4. Impact assessment During report preparation
Noise*
Mr. Avijit Sarkar
9
1. Review of noise section in baseline, Impact, EMP part of the report Throughout the EIA study
LU*
Mr. Shrikant Patil
10
1. Site visit and collection of baseline LU data 2. Procurement of satellite data 3. LU study and report Throughout the EIA study
RH*
Mr. J.L. Thakker
1. Collection of all data for RA study 2. Running of model (DNVPHAST) analysis of model result and report preparation
**Please attach additional sheet if required
Signature & Date
Declaration by the Head of the Accredited Consultant Organization I, Mr. J. L. Thakker, hereby, confirm that the above mentioned experts prepared the EIA Proposed Modernisation of Existing Unit # 6 (500 MW) by change of fuel. I also confirm that I shall be fully accountable for any mis-leading information mentioned in this statement.
Signature: Name: Mr. J L Thakker Designation: General Manager Name of the EIA Consultant Organization: TATA Consulting Engineers Limited. NABET Certificate No. & Issue Date: *See overleaf for the details EIA - FUNCTIONAL AREA CODE S. No.
Functional Area Code
Complete name of the Functional Areas
1.
AP
Air Pollution Prevention, Monitoring & Control
2.
WP
Water Pollution Prevention, Control & Prediction of Impacts
3.
SHW
Solid Waste and Hazardous Waste Management
4.
SE
Socio-Economics
5.
EB
Ecology and Biodiversity
6.
HG
Hydrology, Ground Water & Water Conservation
7.
Geo
Geology
8.
AQ
Meteorology, Air Quality Modeling & Prediction
9.
NV
Noise/ Vibration
10.
LU
Land Use
11.
RH
Risk Assessment & Hazard Management
TABLE OF CONTENTS CHAPTER
TITLE
Page No. 1
INO.
INTRODUCTION
1.1
Purpose of the Report
1
1.2
Identification of Project & Project Proponent
1
1.3
Brief Description of Project
3
1.4
Importance to the Country and Region
7
1.5
Scope of the Study
8
II
PROJECT DESCRIPTION
13
2.1
Type of the Project
13
2.2
Need for the Project
13
2.3
Location
16
2.4
Magnitude of Operation
16
2.5
Plant Layout and Land requirement
17
2.6
Proposed Schedule for Approval and Implementation
19
2.7
Technology and Process Description
19
2.8
Project Configuration
27
2.9
Description of Mitigation Measures
29
III
DESCRIPTION OF ENVIRONMENT
33
3.1
Introduction
33
3.2
Study Area
33
3.3
Period
33
3.4
Components
33
3.5
Methodology
34
3.6
Topography
34
3.7
Geology & Geomorphology
35
3.8
Climate and Meteorology
36
3.9
Air Environment
41
3.10
Noise Environment
49
3.11
Water Environment
52
3.12
Soil Environment
59
CHAPTER
TITLE
Page
NO. 3.13
Existing Industries
No. 63
3.14
Socio-Economic Environment
63
3.15
Land Use Studies
67
3.16
Biological Environment
74
3.17
Traffic & Transport
81
IV
ENVIRONMENTAL IMPACT ASSESSMENT
83
4.1
Impact Identification
83
4.2
Construction Phase
83
4.3
Operation Phase
85
4.4
Environment Management Plan During Construction Phase
111
4.5
Environment Management Plan During Operation Phase
114
V
ANALYSIS OF ALTERNATIVES
130
5.1
Site Selection
130
5.2
Selection of Type of Fuel
130
5.3
Selection of Technology
130
5.4
Selection of Pollution Control Technology
131
5.5
Role of Unit #6 in Meeting Power Requirement – Analysis of
132
Alternative VI
ENVIRONMENTAL MONITORING PROGRAMME
135
6.1
Need for Environment Monitoring
135
6.2
Environment Monitoring Plan
135
6.3
Laboratory
136
6.4
Workplace, Health, Safety & Security
136
6.5
Budgetary Allocation for Environment Protection
137
VII
ADDITIONAL STUDIES
139
7.1
Public Consultation
139
7.2
Risk Assessment
139
VIII
PROJECT BENEFITS
190
8.1
CSR activities
191
8.2
Budget allocation
192
CHAPTER
TITLE
Page No.
NO. IX
ADMINISTRATIVE ASPECTS
194
9.1
Environment Management Cell: Structure and Responsibilities
194
9.2
Implementation of Environment Management System (ISO 14000)
194
9.3
Legal Compliance Monitoring System at TATA Power
195
X
SUMMARY & CONCLUSION
197
10.1
Justification for Implementation of the Project
197
10.2
Measures for Environmental Protection
197
10.3
Conclusion
199
XI
DISCLOSURE OF CONSULTANT
200
LIST OF FIGURES FIGURE NO.
TITLE
Page No.
Figure I.1
Location of the TTPS
5
Figure I.2
Study Area Map of 10 Km Radius from TTPS
6
Figure II.1
Present Merit Order Dispatch Stack (MOD) for Maharashtra
15
Figure II.2
Location of Unit # 6 in the existing TTPS Site
16
Figure II.3
Photographs of existing Unit #6
18
Figure II.4
Typical Process Flow Diagram of the Coal Based Thermal Power Plant
19
Figure III.1
Study Area: 10 km radius from the project location
34
Figure III.2
Topography of the study area
35
Figure III.3
Wind-rose Diagram for summer
38
Figure III.4
Wind Rose Patterns
39
Figure III.5
Annual Wind Rose Based on 30 Years Data, IMD Colaba
41
Figure III.6
Map for Ambient Air Monitoring Locations
43
Figure III.7
RSPM trend in Mumbai since 1996 till 2011
48
Figure III.8
Percentage Contribution of RSPM from different sources in Mumbai
49
Figure III.9
Map for Noise and Traffic Monitoring Locations
51
Figure III.10
Map for Ground and Surface Water Sampling Locations
54
Figure III.11
Location for Soil sampling locations
61
Figure III.13
Land-use Classification of the study area
71
Figure III.14
Land Use Classification Based On Satellite Image within the Study Area (10 Km)
72
Figure.III.15
Satellite Image Study Area (10 Km)
73
Figure.III.16
Google Map Showing Different Ecosystems within the Study Area of 10 Km Radius
75
Figure.III.17a Traffic Trend on B.D. Patil Marg During Study Period (Weekday)
82
Figure.III.17b Traffic Trend on B.D. Patil Marg During Study Period (Weekend)
82
Figure IV.1
Isopleths of Maximum GLC’s for SO2 emission in mg/m3 (Existing Operations)
90
Figure IV.2
Isopleths of Maximum GLC’s for SO2 emission in mg/m3 (After Unit #6 Modernization)
91
Figure IV.3
Isopleths of Maximum GLC’s for NOx emission in mg/m3 (Existing Operations)
92
Figure IV.4
Isopleths of Maximum GLC’s for NOx emission in mg/m3 (After Unit #6 Modernization)
93
Figure IV.5
Isopleths of Maximum GLC’s for PM emission in mg/m3 (Existing Operations)
94
Figure IV.6
Isopleths of Maximum GLC’s for PM emission in mg/m3 (After Unit #6 Modernization)
95
FIGURE NO.
Page No.
TITLE
Figure IV.7
Organic Compost Machine at Trombay
105
Figure IV.8
Biogas Plant at TTPS
106
Figure V.1
Mumbai Demand and Supply Position
134
Figure VII.1
Failure Case Definition Tree
142
Figure VII.2
Toxic Gas Event Tree
142
Figure VII.3
Toxic Liquid Event Tree
143
Figure VII.4
Flammable Gas Event Tree
144
Figure VII.5
Flammable Liquid Event Tree
144
Figure VII.6
Pressure Wave Distance Radii Due to VCE
152
Figure VII.7
2
4 kW/m Intensity Radii Distances due to LSHS Tank Rupture
154 2
Figure VII.8
Hazard Zones on Map from Pool Fire for LSHS Tank Rupture (4 kW/m )
155
Figure VII.9
4 kW/m2 Intensity Radii Distances due to LSHS Tank Connection Leak
155
Figure VII.10
Hazard Zones on Map from Pool Fire for LSHS Tank Connection Leak (4 kW/m2)
156
Figure VII.11
4 kW/m2 Intensity Radii Distances due to LSHS Pipeline Rupture
156
Figure VII.12
Hazard Zones on Map from Pool Fire for LSHS Pipeline Rupture (4 kW/m2)
157
Figure VII.13
4 kW/m2 Intensity Radii Distances due to LSHS Pipeline Leak
157 2
Figure VII.14
Hazard Zones on Map from Pool Fire for LSHS Pipeline Leak (4 kW/m )
158
Figure VII.15
Distances at IDLH concentration of 10ppm due to Chorine Gas Dispersion
158
Figure VII.16
Individual Risk Contours on Map
160
Figure VII.17
FN Curve Illustrating the Societal Risk
161
Figure VII.18
Types of Disaster Management Plan
166
Figure IX.1
Organization structure of Environment & Sustainability Division
195
LIST OF TABLES TABLE No.
TITLE
Page No.
Table I.1
Salient Features of the Project
4
Table I.2.
Environmental Setting of TTPS
7
Table I.3
Environmental Attributes and Frequency of Monitoring for Summer Season (March 2012 to May 2012)
10
Table II.1
Fuel cost of generation for Unit #6 at 100% PLF and 50% PLF
14
Table II.2
Area Details of the Existing TTPS
17
Table II.3
Design Parameters of Steam Generator
20
Table II.4
Expected Boiler Parameters after Conversion
24
Table II.5
Typical Coal analysis
28
Table III.1
Summarised Meteorological Data at project site
37
Table III.2
Climatological Data-Station: IMD, Colaba
38
Table III.3
Summary of wind pattern IMD Colaba
39
Table III.4.
Details of AAQM stations
44
Table III.5
Analytical / Measurement Methods
44
Table III.6
Ambient Air Quality in the Study Area for March 2012 to May 2012
45
Table III.7
Details of Noise monitoring sampling locations
50
Table III.8
Equivalent Noise Levels of the Study Area for March 2012 to May 2012
51
Table III.9
Ambient Noise Standards
52
Table III.10(a)
Ground Water sampling locations
53
Table III.10(b)
Surface Water sample locations
53
Table III.11(a)
Summary of Ground Water Quality
54
Table III.11(b)
Summary of Surface Water Quality
56
Table III.12
Analytical Techniques for Soil Analysis
59
Table III.13
Details of Soil Sampling Locations
59
Table III.14
Soil Properties
61
Table III.15
List of Major Industries within Study Area
63
Table III.16(a)
Demographic Structure of The Study Area – 2001 Data
65
Table III.16(b)
Demographic Structure of the Study Area - 2011 Data
65
Table III.16(c)
Summary of Demographic Details of the Study Area
65
Table III.17
Village wise Infrastructure Facility in the Study Area
66
Table III.18
Employment given by Tata Power
67
Table III.19
Landuse/Land Cover Classification System
68
Table III.20
Landuse in the Study Area
69
Table III.21
List of Trees in the Project Site
75
Table III.22
Quantitative Estimation of Trees in Study Area
78
TABLE No.
TITLE
Page No.
Table III.23
Quantitative Estimation of Shrubs and Herbs
79
Table IV.1
Stack Details after Proposed Modernization
89
Table IV.2
Pollutant Emission Rates for Scenario 1 – Current Operations
89
Table IV.3
Pollutant Emission Rates for Scenario 2 – After Unit#6 Modernization
89
Table IV.4
Summary of Results of Air Quality Impact Assessment – Worst Case Scenario
96
Table IV.5
Effluent discharge quality standards applicable for TTPS
101
Table IV.6
Statistical data of ship movements and barge movements after Unit #6 modernization
107
Table IV.7
Increase in number of bulkers for Fly ash Movement
107
Table IV.8
Environmental Management Plan during Construction Phase
112
Table IV.9
Details of Green Cover in TTPS
116
Table IV.10
Action Plan of Green Belt Development
120
Table V.1
Available Coal Unloader Options
130
Table V.2
List of Available Pollution Control Technologies
131
Table V.3
Comparison of Different Emission Scenario using Heavy Oil
132
Table VI.1
Environmental Monitoring Programme during Construction Phase
135
Table VI.2
Environmental Monitoring Programme during Operation Phase
136
Table VI.3
Cost provision for Environmental Measures for the proposed Modernization Project
138
Table VII.1
Details of Hazardous Materials/ Chemical to be Stored at Proposed Power Plant
140
Table VII.2
Likely Incidents in case of Systems Failure
146
Table VII.3
Failure Cases Considered for Consequence Analysis
147
Table VII.4
Weather Data Used for Risk Analysis
148
Table VII.5
Radiation Effects
149
Table VII.6
Heat Radiation and Escape Time
149
Table VII.7
Damage Produced by Blast (Clancey, 1972)
150
Table VII.8
Distances of Occurrence of Various Thermal Radiation Intensities
153
Table VII.9
Distances for IDLH Concentration of 10ppm occurred due to Chlorine Tonner Valve Failure
154
Table VII.10
Event Frequency for Failure Scenarios
159
Table VII.11
Role of Key Personnel
167
Table VII.12
Duties and Responsibilities of Key Personnel
168
Table VII.13
Details of Fire Engines
177
Table VII.14
Fire Protection System at TTPS
177
Table VII.15
Agencies and Groups Required to Combat Disaster
182
Table VIII.1
CSR Activities plan of TTPS for next Five Years
193
LIST OF ANNEXURES ANNEXURE NO.
TITLE
Annexure-I
ToR issued by MoEF
Annexure-II
ToR Compliance
Annexure-III
Proposed layout of modernization of Unit #6
Annexure-IV
Copy of Coal Supply Agreement
Annexure-V
The radioactivity and heavy metal analysis of the coal and fly ash
Annexure-VI
Layout of proposed Captive Coal Berth facility
Annexure-VII
CRZ map for TTPS
Annexure-VIII
The results of ambient air quality monitoring
Annexure -IX
National Ambient Air Quality Standard
Annexure-X
List of Flora and fauna in the study area
Annexure-XI
Detailed Report from CMFRI for the Marine Ecology
Annexure-XII
The Mixing Height Data for Summer
Annexure-XIII
Incremental Temperature and pH at Surface of Sea during Low tide and High Tide
Annexure-XIV
Bottom Ash Analysis for Heavy Metals and Leachate Analysis
Annexure-XV
Mangrove Conservation plan
Annexure-XVI
The layout of the proposed green area and existing green area
Annexure-XVII
Corporate Social Responsibility Report
Annexure- XVIII
CEA Specification for Requirement of land
Annexure-XIX
Compliance Status of earlier Environmental Clearance
Annexure-XX
Corporate Environmental Policy
Annexure-XXI
Letter From Fly Ash Exporter
Annexure –XXII
Water Balance Diagram
Annexure –XXIII
Public Hearing Proceedings
Annexure –XXIV
Point- wise reply to issues raised during Public Hearing
Annexure –XXV
Dispersion Modeling File
Annexure –XXVI
Questionnaire
ABBREVIATIONS AAQMS ALARP APHA APM BA BARC BDL BH BHEL BLEVE BMCR BOD BPCL BSI CCPP CEA CEC CEP CESS CMFRI CO COD CPCB CRZ CSR CW CWPRS CWPRS DM DMP EAC ECC EIA EMP ESD ESP ETP FA FD FGD FO FSSS FY GCV
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Ambient Air Quality Monitoring Stations As Low As Reasonably Practicable American Public Health Association Administered Price Mechanism Bottom Ash Bhabha Atomic Research Centre Below Detectable Level Buffer Hoppers Bharat Heavy Electricals Limited Boiling Liquid Expanding Vapour Explosion Boiler Maximum Continuous Rating Biochemical Oxygen Demand Bharat Petroleum Corporation Limited Botanical Survey of India Combined Cycle Power Plant Central Electricity Authority Chief Emergency Co-coordinator Corporate Environment Policy Center for Earth Science Studies Central Marine Fisheries Research Institute Carbon Monoxide Chemical Oxygen Demand Central Pollution Control Board Coastal Zone Regulations Corporate Social Responsibilities Cooling Water Central Water and Power Research Station Central Water and Power Research Station De-mineralize Disaster Management Plan Expert Appraisal Committee Emergency Control Centre Environmental Impact Assessment Environment Management Plan Emergency Shutdown System Electrostatic Precipitation Effluent Treatment Plant Fly Ash Forced Draft Flue Gas Desulphurization Furnace Oil Furnace Supervisory and Safety System Financial Year Gross Calorific Value
GLC GOG GPS GR HAZID HPCL HSD HTL IAIA ICC ID IDLH IMD INR ISCST ISO JNPT LDO LFL LRSB LSFO LSHS LTL MARG MAS MCGM MCR MECR MMSCMD MoEF MPCB MRC MSEDCL MSETCL MSL NAAQS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NABL
.
NDIR NIOSH NOx ONGC OSEC PHAST PLF PM
. . . . . . . .
Ground Level Concentration Gas Oil Gas Global Positioning System Gas Circulation Hazard Identification Hindustan Petroleum Corporation Limited High Speed Diesel High Tide Line International Association for Impact Assessment Incident Command Centre Induced Draft Immediately Dangerous to Life & Health India Meteorological Department Indian rupee Industrial Source Complex Short Term International Organization for Standardization Jawaharlal Nehru Port Trust Light Diesel Oil Lower Flammable Limit Long Retractable Soot Blowers Low Sulphur Fuel Oil Low Sulphur Heavy Stock Low Tide Line Mutual Aid Response Group Mutual Aid Scheme Municipal Corporation of Greater Mumbai Maximum Continuous Rating Main Emergency Control Room Million Metric Standard Cubic Meter Per Day Ministry of Environment & Forests Maharashtra Pollution Control Board Mumbai Research Centre Maharashtra State Electricity Distribution Company Limited Maharashtra State Electricity Transmission Company Limited Mean Sea Level National Ambient Air Quality Standards National Accreditation Board for Testing and Calibration Laboratories Non Dispersive Infrared National Institute for Occupational Health and Safety Oxides of Nitrogen Oil and Natural Gas Corporation On-Site Emergency Control Process Hazard Analysis Software Tools Plant Load Factor Particulate Matter
PM PMF PPE PUC QRA R&R RAPH RCC RLNG RSPM SADC SC SCAPH SCR SEIAA
. . . . . . . . . . . . . . .
Particulate matter Progressive Massive Fibrosis Personal Protective Equipment Pollution Under Control Quantitative Risk Assessment Resettlement and Rehabilitation Regenerative Air Pre-heaters Reinforced Cement Concrete Re-gasified Liquefied Natural Gas Respirable Suspended Particulate Matter Secondary Air Damper Control Scheduled Castes Steam Coil Air Pre-heater Site Emergency Control Room State Environment Impact Assessment Authority
SO2
.
Sulphur Dioxide
SPM ST STP TCE TISS TLV TMCR ToR TPD TPH TPL TTPS TWA UFL US-EPA VCE
. . . . . . . . . . . . . . . .
Suspended Particulate Matter Scheduled Tribes Sewage Treatment Plant Tata Consulting Engineers Tata Institute of Social Sciences Threshold Limit Value Turbine Maximum Continuous Rating Terms of Reference Tonnes Per Day Tonnes Per Hour TATA Power Limited Trombay Thermal Power Station Time Weighted Average Upper Flammable Limit US-Environmental Protection Agency Vapor Cloud Explosion
EXECUTIVE SUMMARY 1. INTRODUCTION Tata Power’s Trombay Thermal Power Station (TTPS) has proposed modernization of its existing Unit # 6 (500 MW) by change of fuel from Low Sulphur Heavy Stock/ Low sulfur fuel oil (LSHS/LSFO) to low sulphur imported coal. 1.1 PROPOSED PROJECT DETAILS: In 1960’s the industrial growth demanded continuous uninterrupted power supply to the city of Mumbai. With this aim, the TTPS was established in 1956 for providing clean and uninterrupted power supply to the city of Mumbai and vital installations like Bhabha Atomic Research Centre (BARC), Refineries and Indian Railways. Presently the TTPS provides power to majority consumers (bulk & retail) in Mumbai and has an installed generation capacity of 1580 MW. TTPS consists of following thermal power generating units:
Unit No. 4 - 150 MW - (Presently Stand by)
Unit No. 5 - 500 MW - (Coal)
Unit No. 6 - 500 MW - (Oil)
Unit No. 7 - 180 MW - Gas Combined Cycle Power Plant (CCPP)
Unit No. 8 - 250 MW - (Coal) Table – 1: Salient Feature of the Project Sr. No.
Components
Details
1
Project Type
2
Capacity
Modernization of existing unit with change of Fuel from LSHS/ LSFO to coal 500 MW
3
Area
Area of TTPS is 430 Acres
4
Location
5 6 7
Technology Fuel Project cost
Trombay, Near Mahul Village, Chembur, Mumbai, Maharashtra Sub critical Boiler (Existing) Imported low sulphur low ash coal 1174 Crores
1.2 OBJECTIVE OF THE STUDY: This Environmental Impact Assessment (EIA) report is prepared for obtaining the Environmental Clearance (EC) from Ministry of Environment and Forests (MoEF), Government of India, New Delhi, for the proposed modernisation of existing Unit # 6 at TTPS. The Draft EIA report has been prepared in accordance with the Terms of References (ToR) issued by MoEF vide letter no. No.J-13012/114/2011-IA.II (T) dated 25th January 2012 and letter no. J13012/121/2011-IA.II (T) dated August 24, 2012. EIA for the proposed project has been carried out by TATA Consulting Engineers Ltd., which is accredited by Quality Conical of India (QCI) NABET
Executive Summary
1
Final EIA Report for Modernization of existing Unit #6
1.3 ENVIRONMENTAL SETTINGS: The Environmental settings of the proposed project is given in Table – 2 Table – 2: Environmental settings of the TTPS Sr. No
Particulars
1 2
Elevation above MSL Climatic conditions (Annual as per IMD-Colaba)
3
5
6 7 8 9 10 11 12 13 14
Details
0 - 6m Annual Mean Max Temp: 31.2 0C Annual Mean Min Temp : 23.7 0C Annual Rainfall : 2146 mm Climatic conditions Max Temp: 33.4 0C (Summer as per IMD- Min Temp: 22.7 0C Colaba) Rainfall: 4.4 mm Site specific climatological Maximum Temperature: 39.4 0C data (Summer season 2012) Minimum Temperature: 21.4 0C Rainfall: Nil Nearest Highway Sion Panvel Highway about 6 KM Nearest Railway station Kurla Railway Station about 7 km Nearest Air Port Chatrapati Shivaji International Airport about 12 km Reserve Forest Nil in 10 km Radius Ecologically sensitive zones Nil in 10 km Radius Archaeological monuments Elephanta caves about 5 km Water bodies (River/ Lake)) Ashish Lake at about 4km Defence Installations BARC, Naval Communication Centre within 1 km area from site Seismic Zone III
1.4 JUSTIFICATION FOR THE PROPOSED PROJECT: The peak power demand of Mumbai was 3391 MW (Including Maharashtra State Electrical Distribution Company Limited load fed by Mumbai) in June 2011, which is expected to increase to 4000 MW by the year 2014-15. The total generation availability in Mumbai is about 2277 MW resulting in a gap of about 1114 MW during Financial Year (FY) 2011-12 with all generating units generating at full capacity. This gap would further increase to 1723 MW by FY 2014-15 if no generation is added to Mumbai network. This has increased the importance of embedded generation within the city of Mumbai at affordable cost. With the increase in the cost of LSHS/ LSFO, the Unit #6 generation is becoming unaffordable to the consumers. Hence, Tata Power has proposed modernization of existing Unit #6 by change of fuel to use low sulphur imported coal instead of LSHS/ LSFO. Unit #6 (500 MW) is operational since 1990. It is currently being operated on LSHS/ LSFO and gas as and when available. LSHS/ LSFO of desired low sulphur is not available locally in adequate quantity to meet the environment norms. It has to be imported at very high cost resulting in uneconomical generation cost of power from Unit #6. The unit is currently operated at 50% capacity only. Natural gas is not available in sufficient quantity and is unlikely to be Executive Summary
2
Final EIA Report for Modernization of existing Unit #6
available in near future also. With the widening gap between demand and supply of power, it is necessary that existing Unit #6 should be operated at full capacity with the only alternative fuel available which is low sulphur imported coal. Thus proposed modernization of Unit # 6 with coal firing is essential to meet the demand of power at reasonable cost to consumers. 2.
DESCRIPTION OF PROJECT A coal based thermal power plant converts the thermal energy of the coal into electrical energy. This is achieved by raising the steam to high temperature and pressure in the boilers, expanding it through the turbines and coupling the turbines to the generators which converts mechanical energy into electrical energy. There will not be any change in the production process after proposed modernization as coal will be utilised as fuel instead of LSHS/ LSFO. The generation capacity of the unit after the proposed modernisation of Unit #6 will be same as it will continue to generate 500 MW. It is proposed that imported low sulphur low ash coal shall be used in Unit #6. With the use of imported coal, TTPS can remain within existing limits of emission and additional ash generated can be easily utilized by extending current facilities. Considering Gross Calorific Value (GCV) of 5000 Kcal/ kg of design coal, the coal requirement for Unit #6 at full load works out to 250 TPH i.e, 6000 TPD. Annual requirement at 90% PLF is estimated to be 2.0 Million MT. There will not be any change in the water requirement after the proposed modernization of Unit #6. Presently Unit #6 requires 66,000 m3/hr of sea water which is drawn from the Thane Creek. After the proposed modernization the quantity will remain same. The water balance diagram is attached as Annexure XXII for further details. TTPS has its own captive coal berth facility for handling and unloading of coal for other units at Trombay. The same is operational with installed capacity of 2.4 million Metric Tonne (MT) per year. This existing facility will be suitably augmented with additional equipment to unload coal for Unit #6. This will increase the coal unloading and handling capacity of the Captive Coal Berth from 2.4 Million MT/ year to 4.4 Million MT/ year. Additional coal storage facility will be created next to the coal berth for storing coal up to 2 Lakh MT. The said facility will be provided with the mechanized coal handling system to handle coal in an environment friendly manner. The existing coal berth will be optimally utilized with additional equipment without increase in the length of berth. Two coal conveyors are proposed from the captive coal berth to the Unit #6 for feeding the coal from the West side of the power Plant. The coal conveyor will be partially of belt type and partially pipe type with the proper covering arrangement to avoid dust emission. All existing system of captive coal berth will be utilized during the proposed modernization and there is no anticipation of any additional construction except installation of equipments for coal unloading such as additional coal unloader of 1500 TPH for enhancing coal unloading capacity, stacker reclaimer and conveying system. The ash content in the coal will be approximately 4.5% to 5.5%. Total Ash generation after proposed modernization of Unit #6 will be 270 MT/ day. Out of this, Fly Ash generation will be about 216 MT/ day and bottom ash generation will be about 54 MT/ day. Fly ash will be utilized in Ready Mix Concrete, Cement plant, construction area etc. Bottom ash will be stored in hydro bins and same will be utilized in brick making.
Executive Summary
3
Final EIA Report for Modernization of existing Unit #6
Layout of the TTPS has been optimized considering the space requirements for all the equipment, systems, buildings and structures required for the proposed 500 MW coal conversion of existing Unit # 6. Hence there will not be any additional land required for the proposed modernization project. 3. DESCRIPTION OF THE ENVIRONMENT Primary baseline environmental monitoring studies were conducted during summer season (March 2012 to May 2012), summary of same is as follows: 3.1 Meteorological Data Generated at Site: The meteorological parameters were recorded on hourly basis during the study period near proposed plant site. The parameter like wind speed, wind direction, temperature, relative humidity, atmospheric pressure, rainfall and cloud cover. The summary of meteorological data generated at site enlisted in below table Table – 3: Meteorological Detail of the project site Sr. No.
Parameters
Min. Value
Max. Value
Avg. Value
1
Wind speed (m/s)
0.3
14.6
2.3
2
Temperature (C)
21.4
39.4
26.9
3
Humidity (%)
19.5
86
54.7
4
Rainfall (mm)
Nil
Nil
Nil
3.2 Air Quality: The study area represents mostly urban and developed environment. Seven ambient air quality monitoring stations were selected in and around project site within 10 km radius of the study area. The parameters like Suspended Particulate Matter (SPM), Particulate Matter
