Padma Multipurpose Bridge Project

There must be adequate sanitary latrines for use by the construction labors and others as pernational standards. The sanitary latrines will be such designed that it does not contaminategroundwater during monsoon when water level rises up. This requirement is in addition tothose needed in the construction camps. As per national standards, the minimum water use is 50liters/person/day and one latrine for10person. All construction labors and others who will be working in the construction yards and othersites must wear health and safety dresses, shoes and other measures as appropriate.87. Loss of Aquatic Habitats: There are no permanent wetlands in the flood plain areas whereconstruction yards are proposed; however the areas are subject to seasonal inundation and arenourished by nutrients carried with seasonal floods and also are habitat of fish and aquatic fauna. Assuch construction yard development will have negative impact; the estimated loss of temporaryseasonal wetlands is 143ha (CY1: 100% and CY2: 79% agriculture land). Aquatic habitat will beaffected mainly during high flood; effects are expected to be very low during the low annual flood.88. Noise Quality: Development of proposed construction yards will deteriorate noise quality duringconstruction activities due to operation of construction equipments/machineries, unloading ofconstruction materials from barges, loading of bridge elements, rocks/boulders from use in RTW,frequent movement of transport vehicles. Noise quality in the construction yards will also deterioratedue to steel fabrication and the operation of generators at the time of load-shedding. The overallimpact of noise to the recipients will depend on the position of equipments and their cumulativeactions. As can be understood from Table 7-8, that noise level in the construction yards willdeteriorate and exceeds the government standards for construction work site. Therefore, thereceptors in the construction yards (labors and others) will be affected with the high noise level. Theywill be required to use ear-plugs to offset the effect as noise management at the source levels areexpected to be difficult except for the generators where use of muffler would reduce the noise level atsource.89. The surrounding communities will remain outside the construction places and these communitieshave extensive vegetation coverage, the noise impact from construction yards to these communitiesis expected insignificant.90. Air Quality: Both construction yards will accommodate various equipments/plants and materialstorages. The facilities would include a land backed sheet piled wharf for handling constructionmaterials and berthing of marine equipment. The sites would also have major concrete plants and aprecast yard for manufacture of bridge beams, barriers and all other precast items. Sites would haveprovision for water supply, waste treatment, power and lighting. Contractors will decide on thespecifications of equipments and materials those will be stored in both construction yards, a generallist of equipment and material storages are provided below: Aggregate crushing and screening plants, concrete batch mixing plants, steel fabricationfacilities (including formwork), barges, trucks, tugs, floating cranes, survey vessel, personnellaunches, rebar fabrication facilities, power supply (generators, transformers, weigh bridge,laboratory, and waste water treatment and disposal. Since both construction yards are veryclose to the residential areas, asphalt plants will not be sited in the construction yards. Both construction yards will be used for material storages and handling, storage of petrochemicals,storage of aggregates and preparation of 267,000m 3 of concrete, steel trusscomponents and assembling of steel trusses, strand for precasting, precast beams and deckunits.91. Deterioration of air quality due to handling of materials and operation of equipment is expected inboth CY. The contractors will be responsible for careful handling and storages of materials andoperation of the equipment in order to reduce the air pollution including dust. Special attention mustbe given in storage and handling of petrochemicals in order to avoid environmental hazard and risk.The generators will be the major source of air pollution in the construction yard, since, the exactspecification of the generators are unknown at this stage, an indicative assessment of air pollution isdone for a 500kw capacity and is provided in Table 7-19.Table 7-19: Indicative emission of 500kw diesel powered generator.Parameter Emission (kg)7-26