Padma Multipurpose Bridge Project

Annex 4-2: Impact Assessment MatrixEnvironmental ComponentsProject Activities in Different PhasesConstruction yards1. Topography 2. Top Soil/Bed Material 3. River Flow 4. Drainage 5. Erosion/ScourInteractionWeightageDegree of ImpactShort TermLong TermPartly MitigableFully MitigableComposite Rating ValeImpact ValueInteractionWeightageDegree of ImpactShort TermLong TermPartly MitigableFully MitigableComposite Rating ValeImpact ValueInteractionWeightageDegree of ImpactShort TermLong TermPartly MitigableFully MitigableComposite Rating ValeImpact ValueInteractionWeightageDegree of ImpactShort TermLong TermPartly MitigableFully MitigableComposite Rating ValeImpact ValueInteractionWeightageDegree of ImpactShort TermLong TermPartly MitigableFully MitigableComposite Rating ValeImpact ValueDredging for development of Construction Yards √ 3 -3 √ √ -2 -6 √ 4 -1 √ √ -1 -4 √ 3 -1 √ √ -1 -3 √ 4 -1 √ √ -1 -4Mobilization of construction vehicles/materialsand and movement of barges/vehiclesClearing of sitesRemoving of top soils √ 3 -2 √ √ -1 -3 √ 4 -1 √ √ -1 -4Earth filling and compaction √ 2 -1 √ √ -1 -2 √ 3 1 √ 1 3 √ 4 -1 √ √ -1 -4Development of facilities for construction√ 4 -1 √ √ -1 -4activitiesStorage, batch mix and fabrication √ 4 -1 √ √ -1 -4Operation of Construction Yards √ 3 -3 √ √ -2 -6 √ 4 -3 √ √ -2 -8Public utility crossingsInstillation of high pressure gas pipeInstallation of high voltage lineInstallation of optical fibresOperation & Maintenance and regionaldevelopmentMain Bridge √ 4 -1 √ √ -1 -4 √ 4 -2 √ √ -2 -8River Training Works √ 4 3 √ 3 12Approach roads √ 3 -3 √ √ -2 -6Approach railsBridge end facilitiesPublic utility crossingsAssociated componentsWidening of National Highway (N8) √ 2 2 √ 2 4 √ 3 -1 √ √ -1 -3 √ 3 -2 √ √ -1 -3Railway connectivity √ 2 2 √ 2 4 √ 3 -2 √ √ -1 -3Construction of public utilitiesImpacts at regional scale (induced impacts)Road network development √ 2 2 √ 2 4 √ 3 1 √ 1 3 √ 3 -2 √ √ -1 -3Roadside development √ 2 2 √ 2 4 √ 3 1 √ 1 3 √ 3 -2 √ √ -1 -3Industrialization √ 2 2 √ 2 4 √ 3 1 √ 1 3 √ 3 -2 √ √ -1 -3Railway network development √ 2 2 √ 2 4 √ 3 1 √ 1 3 √ 3 -2 √ √ -1 -3Padma Multipurpose Bridge Design ProjectFinal Report (Environmental Action Plan)Environmental Impact Assessment ReportApril 30, 2010A4.2-3