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Sepetiba dredging and reclamation works CEDA dredging days Oct 200811 Session 5: Dredging in sensitve areas Date: 2 Oct 2008 Time: 10:50 – 11:10 Author:

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Presentation on theme: "Sepetiba dredging and reclamation works CEDA dredging days Oct 200811 Session 5: Dredging in sensitve areas Date: 2 Oct 2008 Time: 10:50 – 11:10 Author:"— Presentation transcript:

1 Sepetiba dredging and reclamation works CEDA dredging days Oct Session 5: Dredging in sensitve areas Date: 2 Oct 2008 Time: 10:50 – 11:10 Author: Jeroen Gheysens CEDA dredging days – October 2008

2 Sepetiba dredging and reclamation works CEDA dredging days Oct Overview Main project information Dredging in sensitive areas Environmental monitoring Dredging of contaminated materials Reclamation area layout

3 Sepetiba dredging and reclamation works CEDA dredging days Oct BRAZIL SEPETIBA BAY Reclamation Area Dredging Area Geographical Location SÃO PAULO RIO DE JANEIRO

4 Sepetiba dredging and reclamation works CEDA dredging days Oct General Info on Project CLIENT: ThyssenKrupp CSA Companhia Siderúrgica CONTRACTOR: Consorcium Dredging International nv – Boskalis International bv EXECUTION PERIOD September 2006 – April 2008

5 Sepetiba dredging and reclamation works CEDA dredging days Oct DREDGING AREA RECLAMATION AREA Access Channel –Length 4,3km –Bottom width 128m –Dredging depth -14,5m CD –Volume m³ Harbour Basin –Turning circle 250m –Dredging depth -14,5m CD –Volume m³

6 Sepetiba dredging and reclamation works CEDA dredging days Oct Large Cutter Suction Dredger (CSD) –Vlaanderen XIX: kW Boosters –Cosel: kW –DI 509: kW –Nieuwe Merwede: kW

7 Sepetiba dredging and reclamation works CEDA dredging days Oct Confined Disposal Facilities –CDF m³ –CDF m³ Contaminated Material –Volume m³ Capping Material –Volume m³

8 Sepetiba dredging and reclamation works CEDA dredging days Oct Environmental CSD Beaver St. Lawrence –Cutter Power: 171 kW –Pump Power: 839 kW

9 Sepetiba dredging and reclamation works CEDA dredging days Oct Overview Main project information Dredging in sensitive areas Environmental monitoring Dredging of contaminated materials Reclamation area layout

10 Sepetiba dredging and reclamation works CEDA dredging days Oct Dredging in sensitive areas Sepetiba Bay: historical contamination, mainly heavy metals – Mangroves - Fishery Environmental effects –Spreading and settlement of resuspended solids –Impact on soil organisms during operation –Alteration of bathymetry –Changing shoreline configuration MINIMISE THE ENVIRONMENTAL EFFECTS!

11 Sepetiba dredging and reclamation works CEDA dredging days Oct Dredging in sensitive areas Minimise the environmental effects –Understand the environmental situation and identify the most sensitive areas –Selection of dredging equipment –Identification of environmental impacts –Selecting the most appropriate working method –Well trained, experienced and environmental aware crew –Environmental management and monitoring plan

12 Sepetiba dredging and reclamation works CEDA dredging days Oct Overview Main project information Dredging in sensitive areas Environmental monitoring Dredging of contaminated materials Reclamation area layout

13 Sepetiba dredging and reclamation works CEDA dredging days Oct Environmental Monitoring Water quality monitoring –Suspended solids dewatering < 500mg/l Capping of CDF’s –Capping layer of 1m with ‘no contamination’ Noise level monitoring –< 65dB (background level)

14 Sepetiba dredging and reclamation works CEDA dredging days Oct Environmental Monitoring Baseline monitoring –Identification of the situation before the start of the works –Relationship turbidity – suspended solids Background monitoring –Weekly basis (background locations) –Identify turbidity from other sources River discharges Heavy rainfall Seasonal fluctuations

15 Sepetiba dredging and reclamation works CEDA dredging days Oct Environmental Monitoring Water quality monitoring –Daily measurements at fixed locations Turbidity (~ Suspended Solids) Water temperature Salinity Instrument Depth DREDGING AREA RECLAMATION AREA

16 Sepetiba dredging and reclamation works CEDA dredging days Oct Fixed points in the river São Francisco TSS (mg/l) = 1,14 NTU

17 Sepetiba dredging and reclamation works CEDA dredging days Oct Fixed points in the Sepetiba Bay TSS (mg/l) = 2,74 NTU

18 Sepetiba dredging and reclamation works CEDA dredging days Oct Points around the dredger TSS (mg/l) = 2,74 NTU

19 Sepetiba dredging and reclamation works CEDA dredging days Oct Overview Main project information Dredging in sensitive areas Environmental monitoring Dredging of contaminated materials Reclamation area layout

20 Sepetiba dredging and reclamation works CEDA dredging days Oct Confined Disposal Facilities –CDF m³ –CDF m³ Contaminated Material –Volume m³ Capping Material –Volume m³

21 Sepetiba dredging and reclamation works CEDA dredging days Oct Dredging of contaminated materials Minimise spillage, turbidity and turbulence Minimise storage by high concentration dredging Minimise noise and unpleasant smells Optimise precision for accurate and selective thin layer dredging

22 Sepetiba dredging and reclamation works CEDA dredging days Oct Dredging of contaminated materials Environmental Sweep Dredger vs Environmental Disc Cutter

23 Sepetiba dredging and reclamation works CEDA dredging days Oct Overview Main project information Dredging in sensitive areas Environmental monitoring Dredging of contaminated materials Reclamation area layout

24 Sepetiba dredging and reclamation works CEDA dredging days Oct Reclamation area layout Mangroves (high environmental sensitive area) –Protect from salt water of the dredging process –Risk of bund wall failures (Monitoring!) Reduce suspended solids dewatering –Maximise travel distance of water on the area –Weir boxes (managing water levels on the area) –Monitoring!

25 Sepetiba dredging and reclamation works CEDA dredging days Oct


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