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Executive Summary Of EXECUTIVE SUMMARY OF Environmental Impact Assessment Report for Proposed 1×660 MW Coal Based Super Critical Thermal Power Plant at Saleki NC & Lekhapani (V), Makum Mouza & Margherita Revenue Circle(T), Tinsukia (D), Assam. (for Public Hearing as per MoEF Notification S.O.1533 Dt. 14TH Sept 2006) Submitted To State Pollution Control Board, Assam Bamunimaidam, Guwahati-21 Submitted By Assam Power Generation Corporation Limited (APGCL) Bijulee Bhavan, 3rd Floor, Paltan Bazar,Guwahati-781001 Prepared By Ramky Enviro Engineers Limited, Ramky House, Somajiguda, Hyderabad-500082 (QCI/NABET Approved - Certificate No. NABET/EIA/1013/016) 1x660 MW Coal Based Thermal Power Plant at Margherita, Assam EXECUTIVE SUMMARY 1 INTRODUCTION Assam Power Generation Corporation Limited (APGCL), situated at Bijulee Bhawan, 3rd Floor, Paltan Bazar, Guwahati in the State of Assam proposes to set up a 1x660 MW Coal based Margherita Power Station project in the district Tinsukia of the state Assam. APGCL has conceived setting up a Thermal Power Station which consists of Coal Fired Boiler, Steam Turbine Generator Units and Balanced of Plant (BOP) Units. Based on the proposed capacity, the project is supposed to fall under category A of Project Activity 1(d), Thermal Power Plants (≥ 500 MW coal/ lignite/ naptha & gas based) under the schedule as per EIA notification issued on 14th September, 2006. In order to assess the likely impacts from current project on the surrounding environment and evaluating the means of alleviating the likely negative impacts, if any, from the proposed project, APGCL has retained Ramky Enviro Engineers Ltd. as their environmental consultant. The proposal was considered by the Expert Appraisal Committee (EAC) in during its 66th Meeting on 6th February, 2013 for determination of the Terms of Reference for undertaking detailed EIA Study in accordance with the provisions of the EIA notification dated 14th September, 2006. The EAC has issued Terms of Reference vide its Letter No. J-13012/1/2013 - IA. II (T) dated: 15th March 2013. The EAC has also issued an amendment to the proposal for its 24th EAC meeting revising the power plant capacity from 2x250 MW to 1x660 MW at the same location. The report has been prepared as per the recommendations of the revised Terms of References (TOR) for a capacity of 1x660 MW thermal plant. The proposed 1x660 MW thermal power plant is to be located in Saleki & Lekhapani villages, of Makum (Mouza) Margherita Revenue Circle Taluka of Tinsukia District. NH-3 is passing around 1.5 km away from the proposed site in North West direction. Ledo & Lekhapani railway stations are 8 km and 2 km distance away from the site. The total land required for the proposed power plant is around 575 acres and the land is basically covered with shrubs, plantation and used for grazing. The land break up comprises of 171 acres for main plant, coal handling systems, water reservoir switchyard with all BOP facilities including roads network. Greenbelt is proposed in 57 acre and ash disposal area is planned in 165 ac. of land. Township is also planned at the project location with an area of 100 ac. APGCL proposed to utilise an area of 575 acre of land setting up 1x660 MW power plant. As comparison to CEA guidelines the land required for similar capacity power plant is around 683 acre. Indicating present APGCL project is well within the limits in terms of area utilization. The inter-state boundary for the site is around 1.5 km and general conditions of the MoEF guidelines are applicable for this project. The raw coal is transported to site from Coal India Limited (CIL), Margherita and rail in rake loads of wagons/dumpers are used for reaching the site. The quality of coal required for 660 MW power plant is 1.83 Million TPA with an ash content of 6 to 15% and 2 to 3.5% of Sulphur. Prepared by M/s. RAMKY Enviro Engineers Ltd., Hyderabad Page ES 1 1x660 MW Coal Based Thermal Power Plant at Margherita, Assam The water requirement for 1x660 MW power plant proposed by APGCL is around 2100m3/hr, whereas the CEA guidelines reveals a water consumption of 4000m3/hr for a similar capacity power plant. Total water required for the project will be 2100 m3/hr and source of water is from Burhi Dirhing River which is 6.5 from the site. The site elevation varies between 150 to 236m above mean sea level and is situated in earthquake zone-v as per IS: 1893-2002. The study area of 10 km comprises of mixed forest in NE to SW direction. The Tipang reserved forest is around 7.5 km E of the site. Tamdang and Kotha reserved forests are around 9.0km from the site in SSW and NE directions respectively. The average mean maximum and minimum temperature in to study area is 31.4°c and 8.8° respectively, with a relative humidity of around 88%. The average rainfall in the region’s around 2800 mm and the maximum wind velocity observed in the region is around 2.8m/sec. The source of basic raw material of coal is supplied from Indigenous Margherita Coal from nearby North Eastern Coalfields (NECL) having an F grade with a calorific value ranging between 5500 Kcal/kg. The boiler fuel consumption is 209 TPH and at 80% PLF (plant load factor) the quantity of coal required is 1.83 Million tons/annum. The support fuel is Heavy furnace oil (HFO)/light diesel oil (LDO) and is supplied from nearby refinery at Digboi. The quantity of support fuel required is 3725 KL/annum. The percentage of ash in the coal is ranging between 6 to 15% and the expected total quantity of ash from boiler is around 768 TPD in which the fly ash generation is around 614 TPD and the bottom ash quantity is around 154 TPD. The process boiler used in the plant is pulverized Coal firing boiler (PC). The steam generator will be once through sliding pressure supercritical boiler, vertical wall evaporator with rifle tubing, conventional two-pass, radient reheat, balanced draft and drum less type unit designed for firing Indian Coal as prime fuel. The steam parameters per boiler indicates a flow of 2225 TPH with a pressure of 256 ata and temperature of 568±5°C and the boiler efficiency expected is around 88%. The steam turbine will be horizontally splits multi cylinder (HP. Two IP, Two LP) 300 rpm multistage, single reheat, condensing type unit uncontrolled extraction for regenerative fuel heating with suitable to generate the 660000 KW at 21 KV, hydrogen cooled alternator. The cooling tower type used is induced draft cooling tower. With a boiler stack of 275 m. Flue gas desulphurization of FGD is used for controlling sulphur dioxide emission from coal firing boiler. In this project 90% efficiency of FGD is adequate to take care of the requirement in World Bank emission norms. 2 BASELINE ENVIRONMENTAL STATUS Field investigations were undertaken for collecting the existing baseline environment for Air, Water, Noise, Soil, Ecological and Socio-economic Conditions. A study area of 10 Km radius from the project site is identified to establish the present environmental conditions for the above environmental components. The main aim of the EIA study is to identify the critical environmental attributes which will be affected and have adverse impacts on the surrounding environment due to the proposed 660 MW Super critical thermal power plant. The field data generation is undertaken during the summer season from April to June 2013. Prepared by M/s. RAMKY Enviro Engineers Ltd., Hyderabad Page ES 2 1x660 MW Coal Based Thermal Power Plant at Margherita, Assam The metrological data is collected from the nearest IMD station at Dibrugargh and also at site with the help of automatic weather station. The pre dominant wind direction recorded is from North East (NE) closely followed by East North East (ENE). Calm conditions prevailed for 11.5% of the total time. Average wind speed observed for the summer season is around 2.94 m/s. Ambient Air Quality Ambient Air quality was monitored at 10 locations within the study area of the project site. The locations were identified in downwind, cross wind and up wind directions. The air pollutants monitored are Particulate Matter, Sulphur dioxide, Oxides of nitrogen on hourly basis as per the standard MoEF guidelines and results were compared with CPCB Standards. The minimum and maximum levels of Particulate Matter < 2.5 microns are recorded in the range of 14.1 to 36.8µg/m3, whereas the particulate matter <10 Microns are in the range of 37.1 to 72.3µg/m3. The sulphur dioxide concentrations within the study are observed are in the range of 6.3 to 18.3µg/m3 and the oxides of nitrogen observed are in the range of 10.6 to 26.2µg/m3. The observed pollutant levels were compared with CPCB Standards for Particulate Matter (100µg/m3) and sulphur dioxide and nitrogen dioxide (80µg/m3) and found to be well within the limits indicating the baseline environmental status in terms of air pollution is better with all the pollutants are within the concentration levels. Ozone concentrations were also monitored in the study area and are found to be in the range of 7.6 to 22.4µg/m3, whereas the mercury levels monitored are found to be below detectable limits. Water Quality Monitoring Surface and Ground water samples were collected from different sources within the study area and analyzed for all important physico-chemical and biological parameters to establish the quality of water prevailing in the project surroundings. Around 10 ground water and 3 surface water samples were collected.
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