ENVIRONMENTAL ASSESSMENT of WORLD BANK Public Disclosure Authorized FINANCED 2 X 150 MW GAS TURBINE POWER PLANT at SIDDHIRGANJ
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POWER CELL, POWER DIVISION MINISTRY OF POWER, ENERGY AND MINERAL RESOURCES GOVERNMENT OF BANGLADESH ENVIRONMENTAL ASSESSMENT OF WORLD BANK Public Disclosure Authorized FINANCED 2 x 150 MW GAS TURBINE POWER PLANT AT SIDDHIRGANJ VOL. I REVISED Public Disclosure Authorized Public Disclosure Authorized FINAL REPORT VOLUME 1: MAIN REPORT Public Disclosure Authorized Bureau of Research, Testing and Consultation (BRTC) Bangladesh University of Engineering & Technology (BUET), Dhaka Dec -2fJO7 POWER CELL, POWER DIVISION MINISTRY OF POWER, ENERGY AND MINERAL RESOURCES GOVERNMENT OF BANGLADESH ENVIRONMENTAL ASSESSMENT OF WORLD BANK FINANCED 2 x 150 MW GAS TURBINE POWER PLANT AT SIDDHIRGANJ FINAL REPORT (Revised December 2007) VOLUME 1: MAIN REPORT Bureau of Research, Testing and Consultation (BRTC) Bangladesh University of Engineering & Technology (BUET), Dhaka December 2007 Executive Summary INTRODUCTION In order to increase the capacity of electricity production, the Ministry of Power, Energy and Mineral Resources, GOB has planned to establish a 2x1 50 MW Gas Turbine Peaking Power Plant at Siddhirga~ljwith the financial assistance of the World Bank. According to the Bangladesh Environment Conservation Rules 1997 (GOB, 1997), construction of a power plant project falls under the RED category. Initial Environmental Examination (IEE) followed by Environmental Impact Assessment (EIA) including Environmental Management Plan are required for these types of projects for getting environmental clearance from the Department of Environment (DOE). According to the World Bank (1999) operational policy OP 4.01, this project is classified as an Environmental Category A project, requiring an Environmental Assessment for the construction and operation of the project with recommendations for appropriate mitigation and management measures. Since a detailed environmental assessment of the proposed project is being carried out, the DOE has exempted the IEE of the project in response to the request by the Electricity Generation Company of Bangladesh Limited (EGCB). Thus, as a regulatory requirement set forth in the Environment Conservation Rules 1997 and as a requirement by the project financier, a detailed environmental impact assessment (EIA) has been carried out for the proposed 2x1 50 MW gas turbine peaking power plant project at Siddhirganj Power Station, Narayanganj. DESCRIPTION OF THE PROJECT Project Location The Siddhirganj power generation complex is located on the western bank of Sitalakhya river, just outside and to the east of metropolitan Dhaka, and north of Narayanganj. The co~nplexis located in Siddhirganj pourashava under Narayanganj Sadar upazila within Latitude 23'41'14" to 23O40'45" North and Longitude 90°30'50" to 90°31'47" East. The entire complex is completely enclosed, covers an area of about 88 acres and is owned by the Power Development Board (PDB). Surrounding localities of Siddhirganj Power Plant Complex include Siddhirganj, Adamjee Nagar and Sumil para. The location of the Siddhirganj power generation complex, including the location of the proposed 2x150 MW peaking plant is shown in Figure El. The major existing infrastructures within the Siddhirganj complex include: (i) A 210 MW steam turbine power plant; (ii) A 50 MW steam turbine power plant. The Government has already planned to replace it with 2x120 MW Gas Turbine Plant with ADB financing; (iii) Two 132 KV Sub-stations; (iv) Gas reducing main station; (v) A water treatment plant; (vi) Residential co~nplexfor almost 3000 people; (vii) A school located close to the site of the proposed 2x1 50 MW plant; (viii) A mosque; (ix) A hospital, and (x) Shops and sorne other colnmon facilities. Figure El: Satellite image showing location of proposed 2x 150MW plant within tlie Siddhirganj power plant complex Equipment and Processes General components of the proposed peaking power plant project include the following: (i) Plant facility comprising 2 gas turbines, generators and ancillary plant; (ii) Higli voltage switchyard comprising high voltage transformers and switchgear; (iii) Security fencing and gatehouse; (iv) Generator and Substation Control room, administration, amenities, and workshop facility if necessary; (v) Fire protection tank, water tank and septic tank; (vi) Sedimentation pond and associated earth bund and diversion drain; (vii) Air cornpressor plant; (viii) Switch room; (ix) Emergency generator and transformers; (x) Evaporation pond to accommodate waste water discharges from tlie evaporative air inlet cooler; (xi) Internal roads. 'The proposed peaking plant at Siddhirganj is a gas turbine based generator, wliich would evacuate power to the existing 132 KV transmission line already existing or to tlie under construction 230KV transmission line through the grid substation owned by tlie Power Grid Company Bangladesh. The gas supply to the proposed peaking power plants can be tapped at present from the existing gas line coming from the gas grid junction at Narsingdi, which is connected wit11 the Ashuganj-Monohardi line and also with the Demra-Ri~pga~ijline from Bakhrabad. If the gas availability from these grid lines are found to be inadequate, construction of the proposed gas lines from Ashuganj to Meglinagliat from Baklirabad and Ashugnaj to Aminbazar through Monohordi and Dhanua shoi~ldbe expedited and co~npleted before the completion and commissioning of these peaking plants at Siddliirga~ij.Tliis is also necessary for the Meghna Ghat Phase 2 power station and any fi~rtherexpansion of Haripur Power Station in the near fi~ture. DESCRIPTION OF EXISTING ENVIRONMENT Physical Environment Climate, Geology, Soil Tlie region has a tropical climate. There are two marked seasons: the rainy season from May to October, during which more than 85% of the total annual rainfall occurs and the dry season from November to April. The mean annual rainfall in the area is about 2200 mm, with peak rainfall occurring during June to August. Maximum annual average temperature is around 30°C and minimum annual average temperature is 21°C. Maximum relative humidity for the project area is found as 94.8% in the month of September, whereas minimum relative humidity is 68.4% in tlie month of February. From November to February, the wind direction is from north to northeast and from March to October it is from south to southeast. The maximum wind speed prevails during the month of Clctober, which is 1157 kmlday. Flooding of the existing power plant complex is not yet a major concern. The geology of tlie study area consists of Quaternary deltaic sediments, which have been strongly influenced by tectonic movements on deep-seated faults. The area lies on a tectonic block, which has been uplifted relative to tlie surrounding areas. The soil profile of tlie study area consists of about 12m thick clay deposit followed by sand, clay and progressively coarser sand as depth increases. With specific reference to the proposed power plant project site, the soil is light to medium gray, fine sandy to clayey silt. As part of the baseline study, soil samples were collected from three different locations within the site at shallow depth and analyzed for concentration of 7 heavy metals (Fe, Cd, Cr, Cu, Zn, Pb, Hg). The heavy metal concentrations of the soil samples were found well within the usual ranges for natural soils. A grab sample of the bed sediment from Sitalakhya river was collected and was analyzed for these 7 heavy metals. The heavy metal contents of the bed sediment were well below those of tlie same soil samples collected from the proposed site. Air quality Ambient co~ice~itratio~isof NO, and SO2 are significantly lower compared to the national air quality standard. Available air quality data of February 1998 and 2006 at Haripur, which is near the project site, also shows that except for particulate matter (SPM and PMlo), tlhe other air quality parameters (NO,, SO2 and CO) are within the national standard. Air quality measurement carried out in this study shows that the concentrations of SO,, NO, and CO in vicinity of tlie proposed site are relatively low and below the national ambient air quality standard, while concentrations of SPM and PMlo are higher than the national standards. Noise As a part of EIA, baseline noise level measurements were carried out at different locations within the Siddliirganj complex. Noise level measured near the school located close to the proposed site shows that noise level exceeded 80 dB(A) a number of times during working hours; the mean and median sound levels were 70.7 and 68.3 dB(A), respectively with standard deviation of 7.45 dB(A). The Equivalent Noise Level (Leq-1Hr)was estimated to be 77.44 dB(A) during school hours at current operating conditions. Water Quality Analysis of groundwater carried out in this study shows that the concentrations of the measured parameters satisfy the corresponding Bangladesh drinking water standards and the WHO guideline values. High concentrations of ammonia, BODs and COD in the water sa~nplefrom Sitalakhya river probably indicate that it receives organic pollutant from domestic and industrial sources. High concentration of sulfate and TDS is probabby due to discharge of ~uitreatedtextile dyeing waste. Ecological Environment The project site is located in a peri-urban area. During the EIA process, a baseline study of tlie aquatic ecosystem was undertaken. According to fishermen, there is virtually n~ofish in the river Sitalakhaya during the dry season. Most fishermen mentioned that discharge of toxic wastes from the industries into the river is responsible for decline of fishes. A small-scale macro-invertebrate sampling campaign was conducted near the intake and the outfadl of the Siddhirganj power plant to assess the ecological health of the stretch of the river under consideration. The study, which was conducted during monsoon, showed that the ecological health of the river with respect to macro-invertebrates is "fair". However, the situation may become worse during the dry season. Socio-economic Environment Household number and population in the study area within 5 km radius of the proposed plant location have been estimated and projected for 2006 taking census of 1991 and 2001 as base years.