DOI: 10.5281/zenodo.17729929
title: Table E- 0 - 8 in Saidabad Water Treatment Plant Project, Phase III

description: Table E-0-8: Environmental impact during operation phase and mitigation measures (Originally Table 5)
Activity/IssuesPotential ImpactsProposed Mitigation and Enhancement MeasuresResponsible PartiesPumping operation at the intakeScreening waste accumulation› Screening waste needs to be removed regularly from the coarse screens. Local labour may be employed for such operations.DWASA› Waste should be stored in a designated Waste Storage Area.› Proper disposal of screening wastes, floating debris (to be treated as a solid waste) by available Sonargaon Municipal Solid Waste Management System.Noise management (on ambient environment and flora and fauna)› Plant noise will be maintained following the National Noise Pollution (Control) Rules -2006.› Keep noise level at the raw water intake and pumping operations to a minimum level, as certain fauna (such as Ganges River Dolphins) is sensitive to loud noise.› Specific careAccidental Spillage of fuel (to run generators)› Embedded design features (such as automatic shut-off valves) to prevent discharge of fuel, lubricants, chemicals, and wastes into surface waters or on land.› Adopt proper disposal techniques for any hazardous waste› The intake does not house any rotary equipment or motorised drives which are all located onshore in the RWPS. Therefore, risks of water contamination due to fuel spillage or similar incidents is nil. The only effluent that is likely to be generated at the Intake is domestic sewage from the staff resident at the intake. This shall be provisioned through the Contract as part of Contractor's delivery.Presence of silt, oil and grease in raw water› Design feature for not collecting water from the surface to avoid oil and grease.› Avoid collecting water very close to the riverbed to prevent excess silt from entering.› Keeping a provision in the intake system to collect water from different depths depending on the water level of Meghna RiverPublic Health and Safety› Take measures to avoid or minimize transmission of communicable diseases that may be associated with the influx of temporary or permanent project labor.› Implement measures and actions to control the safety of deliveries of hazardous materials, and of storage, transportation and disposal of hazardous materials and wastes› Implement measures to avoid or control community exposure to the hazardous material› Emergency Response plan of DWASA will include the public evacuation procedures.Treatment plant operationAccidental Spills and leaks oil, toxic chemicals› Good house keepingDWASA› Proper handling of lubricating oil and fuel› Collection, proper treatment, and disposal of spills.› Arranging designated areas for storage facilities for all hazardous materials to prevent spillage into the environment› All hazardous materials storage facilities must be located on an impermeable surface and must be enclosed by a sealed bund wall. The bund wall must be capable of containing 110% of the maximum volumes stored to ensure that soil or watercourses are not polluted in the event of a spill in the storage areas. This is ensured by the design specification.Chlorine Gas Emission› Chlorine Gas Cylinder will be used to minimized the risk of Chloride handling.Generation of sludge dry cakes after sludge dewatering operation› Assessment of characteristics of sludge through TCLP test to confirm that the material is not hazardous.› Exploring beneficial options for dewatered sludge disposal (e.g., land application, co-disposal with sewage sludge)› If beneficial options are not available, consider landfilling in a suitable land/location.› If lands are not available, make arrangements with Dhaka City Corporation to dispose the sludge dry cakes in one of their designated landfills.Generation of liquid residuals after sludge dewatering operation› Direct disposal to nearby lowlands if the residuals meet the effluent discharge criteria as per ECR 2023 (see Annex-C)› If discharge criteria are not met, return to the head end of the plant for treatment. Must not be discharged to the head end as a pulse, rather metered in at a flow rate compatible with the hydraulic loading of the plant preferably during diurnal high flows.Operation of water transmission pipeline and water treatment plantAir Pollution› Ensure that all project vehicles are in good operating conditionContractor (Monitoring by DWASA)› Spray water on dry surfaces/ unpaved roads regularly reduce dust generation› Pave access roads› Maintain adequate moisture content of soil during transportation, compaction, and handling› Sprinkle and cover stockpiles of loose materials (e.g., fine aggregates).› Not using equipment such as stone crushers at site (if any during operation), which produce significant amount of particulate matterTraffic congestion, communication problems› Schedule deliveries of material/ equipment during non-school hours and after regular working hours› Arrangement of alternative communication routes during laying of pipeline across roadsNoise pollution› Use of noise suppressors and mufflers in heavy construction equipment.› Avoid using of construction equipment producing excessive noise during school hours and also at night› Avoid prolonged exposure to noise (produced by equipment) by workers.› Regulate use of horns and avoiding use of hydraulic horns in project vehicles.Disruption of local drainage› Provide adequate diversion channel, if required› Provide facilities for pumping of congested water, if needed› Ensure adequate monitoring of drainage effects, especially if construction works are carried out during the wet season.Operation of Treatment Plant and its ComponentsDisposal of additional volumes of wastewater to be generated due to increased water supply of Dhaka city after project completion› The project objective is to reduce (a) ground water abstraction and (b) replace polluted Sitalakhya River water with Meghna River. There will not be significant volume of additional wastewater generation from the current level of usage.Monitoring by DWASA in cooperation with the authority› Additional wastewater due to population growth within Saidabad Phase-I and II supply zones are currently being treated by Dasherkandi Sewage Treatment Plant and the proposed expansion of Saidabad Phase-III distribution network will be treated by upgrading Pagla Sewage Treatment Plant under Dhaka Sanitation Improvement Project (WB). Therefore, conventional wastewater treatment process will be in place to treat and dispose of water production from all three phases of Saidabad project.Site security› No special security personnel are envisaged during the operation phase; and has been addressed in design specifications. EIB’s International human rights standards and principles include (i) the UN Basic Principles on the Use of Force and Firearms by Law Enforcement Officials, (ii) the UN Code of Conduct for Law Enforcement Officials, (iii) the Voluntary Principles on Security and Human Rights and (iv) the International Code of Conduct on Private Security Providers will be followed if security personnel are employed.Contractor (Monitoring by DWASA)
description: Published as part of Macdonald, Mott, 2025, null, European Investment Bank (EIB), DOI: 10.5281/zenodo.17261043