North Urimari OC
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Draft SCIENTIFIC STUDY OF SOIL EROSION AND PREVENTIVE MEASURES FOR URAMARI OPENCAST PROJECT (2.0 MTY) OF CENTRAL COALFIELDS LIMITED AUGUST, 2010 SLOPE STABILITY CELL ENVIRONMENT DIVISION CENTRAL MINE PLANNING & DESIGN INSTITUTE LTD. (A Subsidiary of Coal India Ltd.) GONDWANA PLACE RANCHI – 834008 Draft SCINTIFIC STUDY OF SOIL EROSION AND PREVENTIVE MEASURES FOR URIMARI OPENCAST PROJECT (2.0 MTY) OF CENTRAL COALFIELDS LIMITED AUGUST, 2010 SLOPE STABILITY CELL ENVIRONMENT DIVISION CENTRAL MINE PLANNING & DESIGN INSTITUTE LTD. (A Subsidiary of Coal India Ltd.) GONDWANA PLACE RANCHI – 834008 INDEX Chapter Name of Chapter Page No 1 Background 1 - 3 2 Project Profile 4 - 11 3 Soil Erosion 12 - 31 4 Control Measures 32- 43 5 Cost & conclusion 44- 47 CMPDI Prevention of soil erosion CHAPTER - I Background 1.0 Purpose CCL had submitted a proposal to concern department for the release of 91.04 Ha. of forest land for Urimari opencast project to MoEF, GoI through DFO, East Division, Hazaribagh. Stage – II clearance has been accorded by MoEF vide letters no.F.No.8 -68/2004 -FC- dated 17.07.08 of Sr. Assistant Inspector General of forest MoEF, Govt. of India with certain conditions. As per clause no. 3 Para I, II, III, IV & V and clause no. 10 of the said letter the user agency has to comply with;- Preparation of a scheme for the proper mitigation measures to minimize soil erosion and choking of stream and shall be implemented; Planting of adequate draught hardy plant species and sowing of seeds to arrest soil erosion; Construction of check dam, retention /toe wall to arrest down of the excavated material along the contour. The area shall be reclaimed keeping in view of the international practice or stablising the dump grading/benching so that the angle of repose (normally less than 280 at any given point) are maintained; Top soil management plan should be strictly adhered; Study on soil erosion/soil flow from the overburden area with help of GIS in consultation of forest department. So, CCL has requested CMPDI (HQ) to prepare the necessary scheme for fulfillment of the above condition vide their letter No. CGM (P&P) 09/815–18 dated 27.10.2009. Accordingly, CMPDI (HQ) has taken up job with job no. 090310041. URAMARI OCP 1 Job no. --090310041 CMPDI Prevention of soil erosion 1.1 Consultation with forest officials A formal meeting between CCL(CGM, E&F and his team) and PCCF cum Executive Director of forest department, Jharkhand was held on 7.12.09 in the office of later to discuss for the fulfillment of the compliance lay down by Sr. Assistance Inspector General of Forest vide their letter no. F.No.8 -68/2004 - FC- dated 17.07.08 regarding the release of 91.04 Ha. forest land for Urimari Opencast Project. The report has been prepared based on the suggestion and guidelines received in the said meeting for the fulfillment of the condition set by Assistance Inspector General of Forest (MoEF). 1.2 Scope of Work:- Study of soil erosion from the overburden area with the help of GIS and preparation of a detailed scheme with sketches and drawings along with cost estimate to minimize/prevent the soil erosion and water pollution, arises due to surface runoff, and prevention of choking of streams in and around the mine lease area of the Urimari OCP project. 1.3. Objective of the scheme- Prevention of Damodar River and their tributaries Potanga & Tilliya nala from being chocked and soiled along with protection of the surrounding land areas from being eroded due to high velocity of surface run-off, prevention of the fertility of the land due to soil erosion owing to the on going Urimari OCP project in the benefit of the local habitants, animals and plants to get good quality of land and clean water in sufficient quantity. It will also help to enhance the ecological balance and will take care of the natural ecosystem. 1.4 Project History :- Urimari Project is situated in South Karanpura Colafields and fall in Barka Sayal Area of Central Coalfields Limited. Presently opencast mining are in progress. The mine has already achieved the production of 86% of the rated capacity of URAMARI OCP 2 Job no. --090310041 CMPDI Prevention of soil erosion 1.30 Mty. Till now this mine has produced 14.39 Mtes of coal of “F” grade along with 15.08 Mm3 of OB at an average stripping ratio of 1.05 m3/te. The coal produced from this mine is being used in power plants. To meet the short fall of coal production, CCL has decided for the expansion of existing Project from 1.3 Mty to 2.0Mty. Total l minable reserve for Urimari Re- organisation up to the stripping ratio 2.2m3/te is 19.5 Mte. and OB volume is 42.93 Mcum. Accordingly, life of Urimari re-organisation opencast project @ 2.0 Mty is calculated as 10 years. Total land requirement is 240.10 Ha. URAMARI OCP 3 Job no. --090310041 CMPDI Prevention of soil erosion CHAPTER - II Project Profile 2.0 General The Urimari Geological Block is under Barka Sayal area in S.K. Coalfield of Central Coalfields Limited, which is situated in Ramgarh District of Jharkhand State. Due to anticipated demand of medium Coking coal grade, it is proposed to expand Urimari re-organisation OCP to produce coal at the rate of 2.0 Mty. per annum from 1.3 Mty. 2.1 Location:- The Project falls in Urimari & Potanga Villages of Barkagaon Block in Ramgarh district of Jharkhand state. a) Latitudes - 230 41’ 04” N to 230 42’ 24”N b) Longitudes - 850.15’07” E to 850 18’ 17” E. c) Topo sheet No.– 73 E/6 and on special DVC Topo sheet no. 47 (6”= 1 mile). d) Company – C.C.L e) District – Ramgarh f) State – Jharkhand. 2.1 Surface Communication: - 2.1.1 Road - The project is connected by Ramgarh–Patratu-Barkakana road, passing very near to the project. Ramgarh is about 20 km. while Ranchi is about 40 km. via Pithoria. The nearest town is Ramgarh. 2.1.2 Railways- Nearest railway stations is Patratu Railway Station, 7.0 km away. This railway station is situated on Gomoh – Barkakna loop line of Eastern Rly. 2.1.3 Airways- Nearest Air service is available from Ranchi that is about 52Km. away from the project. 2.1.4 Distance of important place a) G.M.office, Barka sayal 5.0 KM URIMARI OCP 4 Job no. --090310041 CMPDI Prevention of soil erosion b) Ranchi - -- 40 km.via. Patratu (Takes 1.5 hr. by road) c) Hazaribagh -- 65 km (2.5 hr. by road) 2.2 Topography : - The topography of the proposed expansion project is characterised by two topographic heights stretching two North-South and East-West between them is a shallow, almost flat triangular depression of Potanga/Gandhwani Nalla which gently slopes towards south into the river Damodar, flowing towards east , almost parallel to the property making the southern boundary of the block. 2.3 Drainage The drainage of the block is controlled by the Damodar River flowing along the southern block boundary. Potanga nala forms the eastern boundary of the project, separating it from the existing quarry. Tilaya nala flows across the property on the western side. It is proposed to divert the nalla further west of the property. Maximum elevation within the property is 386 m. The HFL at the road bridge on the river Damodar is 349.60 m. 2.4 Climate Tropical climate is prevailing in this region with three main seasons namely winter, summer and rainy season, which pass through extreme conditions. Each season spreads over three months. April to June is summer season, July to September is rainy season having generally 73 rainy days and average rainfall is 1200 mm and December to February is winter season. Summer days are very dry, scorching heat and dusty day, temperature soar to about 470C while winter nights are very chilly cold and temperature goes down to as below as 30C and rainy season have heavy rain fall. Some times total rain fall is around 2000 mm annually and creates havoc in the regions. Prominent wind direction in summer is from north-south, URIMARI OCP 5 Job no. --090310041 CMPDI Prevention of soil erosion 2.5 Boundaries of Mine Northern Boundary The northern boundary has been fixed along the fault F(I)1 which is the major upthrown fault. This fault has divided the block into two Opencast Projects : North Urimari (3.0 MTY) and Urimari (1.3 MTY) . The upthrown sid (southern side ) of the above fault is being worked in the name of Urimari OCP Which is envisaged for the expansion in this Expansion PR (2.0 MTY). Southern Boundary The southern floor boundary has been fixed along the Fault F(I)4 . Beyond this fault in the northern side , the seams have been downthrown by about 20-40 m. The area towards the south of this fault is not fully explored and the Geological information is not available. The extension of the quarry in the southern side is possible only after the detail exploration of the area. Eastern Boundary Eastern boundary of the quarry surface has been fixed leaving a surface barrier of 60 m against Potanga Nala. An embankment with an elevation not less than 3 m above the H.F.L. against the nalla shall be made to protect from any inundation. Western Boundary On the western side, the quarry would be restricted by faults F(II)5 and F(II)6 and also by Tilaiya Nala 2.6 Geology Urimari Block forms a part of northern limb of syncline of South Karanpura Coalfield.