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Padma Multipurpose Bridge Project

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Annex 4-2: Impact Assessment MatrixEnvironmental Components<strong>Project</strong> Activities in Different Phases1. 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 ValuePre-constructionLand acquisitionResettlement site developmentMobilization of equipments, constructionmaterials/ vehiclesClearing of sitesRemoving of top soils √ 3 -3 √ √ -2 -6 √ 4 -1 √ √ -1 -4Earth filling and compaction √ 2 -1 √ √ -1 -2 √ 3 2 √ 2 6 √ 3 -2 √ √ -1 -3 √ 4 -1 √ √ -1 -4Construction of civil amenities and developmentPlantationEnvironmental Sanitation √ 3 3 √ 3 9ConstructionMain <strong>Bridge</strong>Mobilization of equipments, constructionmaterials/ vehiclesDredging of channels to bring barges √ 3 -2 √ √ -1 -3 √ 4 -2 √ √ -1 -4 √ 3 -1 √ √ -1 -3Movement of barges on the river and√ 4 -2 √ √ -1 -4associated dredgingConstruction o of sub-structure st uctu (pile driving, spoil √ 3 -3 √ √ -2 -6 √ 4 -2 √ √-1 -4disposal)Erection and CastingConstruction of superstructureDisposal of wastesRiver Training WorksMobilization of equipments, constructionmaterials/ vehiclesMovement of dredges √ 4 -2 √ √ -1 -4Dredging for slope preparation √ 3 -3 √ √ -2 -6 √ 4 -3 √ √ -2 -8 √ 4 -1 √ √ -1 -4Placing geo-textile & rocks on the slope √ 4 -1 √ √ -1 -4Construction of revetment/embankment √ 3 -2 √ √ -1 -3 √ 4 -1 √ √ -1 -4 √ 3 -2 √ √ -2 -6 √ 4 -1 √ √ -1 -4Disposal of dredge materials √ 2 -2 √ √ -2 -4 √ 3 -1 √ √ -1 -3 √ 3 -3 √ √ -2 -6 √ 4 -2 √ √ -2 -8<strong>Padma</strong> <strong>Multipurpose</strong> <strong>Bridge</strong> Design <strong>Project</strong>Final Report (Environmental Action Plan)Environmental Impact Assessment ReportApril 30, 2010A4.2-1

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