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Annexure-I Annexure-II Annexure-III Annexure-IV Report on Proposed New Ash dyke at Masunihata Village for Talcher Super Thermal Power Station Stage-I (2x500 MW) Kaniha NTPC Limited (A Government of India Enterprise) September, 2019 TALCHER SUPER THERMAL POWER STATION 0 | P a g e CONTENTS Sl No. Page No. 1.0 Introduction 2 2.0 Existing ash handling & disposal system 2 3.0 Constraints in ash Utilization 2 4.0 Details of current Proposal 3 5.0 Assessment of additional land requirements for Proposed 5 Ash Pond 6.0 Space requirements for extended period of service of station 5 Stage # I (2x500 MW) 7.0 Land details and location advantage of Masunihata Village 5 8.0 Baseline environmental conditions 6 9.0 Hydrogeological condition of ash pond area 8 10.0 Ash water recirculation system & seepage water 9 recirculation system 11.0 Impact of construction of proposed new ash dyke and 9 mitigation measures 12.0 Conclusions 10 TALCHER SUPER THERMAL POWER STATION 1 | P a g e 1.0 Introduction Talcher Super Thermal Power Station (Talcher STPS) is a coal based pit head thermal power station located in the Kaniha block of Angul District of Odisha State with an installed capacity of 3000 MW. Talcher STPS has Stage-I (2x500 MW) and Stage-II (4x500 MW). The first 500 MW units has started commercial operation in the year 1997 and last Unit-6 in the year 2005. The source of water for the power plant is from Samal barrage reservoir of Brahmani River. The plant is getting coal supply from Lingaraj block of Talcher and from Kaniha Block of Mahanadi coal fields Ltd., transported through Merry-Go-Round (MGR) system, owned and operated by NTPC. Power is evacuated through 400 KV transmission lines to different state e.g. Bihar, Orissa, Jharkhand, West Bengal & North Eastern states from Stage-I and all Southern Region States through PGCIL HVDC link from Stage-II. The plant is located between co-ordinates 21o06'24'' N to 21o04'54'' N & 85o05'4'' E to 85o03'38'' E. The coordinates of ash ponds are located between 21o06'03'' N to 21o07'48'' N & 85o00'16'' E to 85o02'29'' E. The nearest railhead is Talcher Railway Station which is at a distance of 30 km from the power plant. NH-55 is passing nearby the plant connecting to Talcher. The nearest Airport is Bhubaneswar which is about 180 Km from the power plant and the nearest sea port Paradip is 226 Km from the power plant. The plant and colony area is located on the right bank of Tikira River and is surrounded by villages Rangabeda, Gadashila, Tolkobeda, Patharamunda and Bhimkand. 2.0 Existing Ash Handling & Disposal System Ash is generated from the combustion of the coal. The coal received for the station contains around 40 % ash. The ash is collected in two parts – Bottom Ash from the Boiler bottom ash hopper and Fly Ash from the ESP Hoppers. In the Ash disposal system, the ash collected from Bottom Ash hopper and ESP Hoppers, is discharged in the form of Ash slurry into the Ash dyke lagoons constructed in the disposal area, by constructing dykes. The ash slurry is allowed to stagnate and most of the ash particle settles to the bottom and almost clear water is collected at the top. The decanted water is drawn out through the weirs located around the water escape tower and through the draw off pipes to overflow lagoon. This water after settlement of fine ash particle is recalculated to plant for reuse. The area of existing ash ponds are 750 acres and 840 acres for Stage-I and Stage-II respectively. Due to constraints in ash utilization, a new ash pond of 148.85 acres is proposed to be constructed on land between existing ash ponds at village Masunihata. 3.0 Constraints in Ash Utilization MOEF&CC Gazette notification dated 03.11.2009 and its amendment, station has to achieve 100% ash utilization every year. Kaniha Station average ash utilization is TALCHER SUPER THERMAL POWER STATION 2 | P a g e about 41% during last 5 years could be achieved, out of which 39.6 % has been used for dyke construction and remaining 1.5% ash has been used in brick manufacturing/Asbestos/Cement industries. Ash utilization at Kaniha is very low because of its remote geographical location, cluster of power plants and less industrial requirement in the vicinity. Moreover, industrial/ constructional requirement of ash is mostly being met up by other power stations like NALCO, GMR etc. which are located close to NH-42. Even after MOEF&CC permission for mine void filling and accord of Forest clearance, there are other critical issues in laying of ash pipeline from existing power plant to Jagannath Mine voids like land acquisition, compensation, shifting of existing infrastructure, clearance of vegetation etc. and it will take some time to resolve them. 4.0 Details of Current Proposal Due to geographical and other constraints, ash utilization in Talcher STPS is very difficult. Existing ash pond of Stage-I is likely to be exhausted by next two years, i.e. by March, 2021. Therefore a new ash pond is proposed near existing ash ponds at village Masunihata. The total land required for new ash pond will be 148.85 acres (109.14 acres private land and 39.71 acres of NTPC existing land). The break-up of proposed land required for ash pond is as follows. Type of land Area in acres Status of land Government Land 28.94 Land acquired during existing project Forest Land 10.77 Forest Clearance taken during existing project Private land 109.14 Land acquisition under process Total Land 148.85 The total land proposed for new ash pond is about 148.85 acres and is surrounded by Derang Road, existing ash pipelines and Bankhuli Jhor Nalla. The coordinate of proposed ash pond is as below: Details of Points Latitude Longitude A (near Bankhuli Jhor Nalla at North 21o 06' 53'' N 85o 01' 01'' E Direction) B (crossing point of Bankhuli Jhor Nalla & 21o 06' 48'' N 85o 01' 19'' E ash pipeline) C (Crossing point of Derang road & Bankhuli 21o 06' 40'' N 85o 00' 46'' E Jhor Nala) D (Crossing point of Derang road & ash 21o 06' 22'' N 85o 01' 46'' E pipeline) The vicinity map of the proposed area is presented in Figure-1. TALCHER SUPER THERMAL POWER STATION 3 | P a g e 21 12‘ 30‘‘ 21 10‘ Ash Pond Stage-II 21 7‘ 30‘‘ Township Proposed New Ash Pond Ash Pond Stage-I 21 5‘ Talcher STPS 21 2‘ 30 ‘‘ 21 / 84 55' 84 57‘ 30'' 85 85 2‘ 30'' 85 5' 85 7‘ 30'' Figure-1: Vicinity Map of Study Area (10 Km radius) from Proposed Ash Pond TALCHER SUPER THERMAL POWER STATION 4 | P a g e 5.0 Assessment of Additional Land Requirements for Proposed Ash Pond According to the present condition and as per the rolling plan, existing ash pond can cater the requirement of Stage-I & II till March 2021 and March 2023 respectively. The Stage-I dyke was designed for 7th raising on its starter which has been completed in Feb’2017 and now its life span is being extended up to Mar’2021 by means of buttressing of the lagoons having raised by upstream method. However, there is no scope for buttressing in Stage-II, which is designed to raise up to 9th raising on centre line method in which dyke embankment extended outwards. During FR stage of the project it was envisaged that acquired land of 750 acres for ash dykes of Stage-I (2X500MW) would cater for 25 years from COD, i.e. up to 2020-21 and 850 Acre of Stage-II (4 X 500MW) would cater for 25 yrs from COD i.e. up to 2029-30. There is substantial difference between envisaged parameters and stations present parameters with respect to PLF, Ash Content/ Coal quantity etc. because of which faster filling has been going on in the dykes as compared to design. At present coal firing quantity is even going up to 420- 450 MT/Hr against designed rating of 350 MT per/Hr for Stage-I and 335 MT/Hr for Stage-II. The life of Stage-I ash dykes was estimated during FR was 25 years as actual life of 20 years (without buttressing). Similarly, life of Stage-II ash dykes was estimated during FR was 25 years against actual life of 17 years (without buttressing). However, after buttressing the life of these ash ponds can be increased for further 2-3 years. 6.0 Space Requirements for Extended Period of Service of Station STAGE # I (2x500 MW) i) COD was in 1997 ii) Designated life: 25 years i.e. upto 2022 iii) Expansion of service after designated life: 5 years i.e. upto 2027 iv) Availability of present ash dyke after buttressing: March, 2021 v) Ash to be generated from 2021 to 2027: 6 yrs @ 26.50 Lakh CuM for Stage # I = 159 Lakh CuM Say, 160 Lakh CuM. The proposed area of Masunihata is 148.85 acres. It is envisaged that approx. 25% of the area shall be utilized for pipeline corridor, service road around dyke, green belt, clear water pond with AWRS etc. The clear area left for construction of starter dyke is approx. 75.0 Acre, 1st raisng 64.0 Acre and 2nd raising 54.0 Acres considering the ‘Up Stream Method’ of raising. According preliminary assessment, the area of Masunihata may create space for 45 LM3 of ash which may cater approx.