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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 200811 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 200822 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 200833 BRAZIL SEPETIBA BAY Reclamation Area Dredging Area Geographical Location SÃO PAULO RIO DE JANEIRO

4 Sepetiba dredging and reclamation works CEDA dredging days Oct 200844 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 200855 DREDGING AREA RECLAMATION AREA Access Channel –Length 4,3km –Bottom width 128m –Dredging depth -14,5m CD –Volume 6.600.000 m³ Harbour Basin –Turning circle 250m –Dredging depth -14,5m CD –Volume 4.500.000 m³

6 Sepetiba dredging and reclamation works CEDA dredging days Oct 200866 Large Cutter Suction Dredger (CSD) –Vlaanderen XIX: 8.358 kW Boosters –Cosel: 5.500 kW –DI 509: 4.475 kW –Nieuwe Merwede: 2.984 kW

7 Sepetiba dredging and reclamation works CEDA dredging days Oct 200877 Confined Disposal Facilities –CDF 1 135.000 m³ –CDF 2 141.000 m³ Contaminated Material –Volume 131.000 m³ Capping Material –Volume 54.000 m³

8 Sepetiba dredging and reclamation works CEDA dredging days Oct 200888 Environmental CSD Beaver St. Lawrence –Cutter Power: 171 kW –Pump Power: 839 kW

9 Sepetiba dredging and reclamation works CEDA dredging days Oct 200899 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 200810 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 200811 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 200812 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 200813 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 200814 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 200815 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 200816 Fixed points in the river São Francisco TSS (mg/l) = 1,14 NTU

17 Sepetiba dredging and reclamation works CEDA dredging days Oct 200817 Fixed points in the Sepetiba Bay TSS (mg/l) = 2,74 NTU

18 Sepetiba dredging and reclamation works CEDA dredging days Oct 200818 Points around the dredger TSS (mg/l) = 2,74 NTU

19 Sepetiba dredging and reclamation works CEDA dredging days Oct 200819 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 200820 Confined Disposal Facilities –CDF 1 135.000 m³ –CDF 2 141.000 m³ Contaminated Material –Volume 131.000 m³ Capping Material –Volume 54.000 m³

21 Sepetiba dredging and reclamation works CEDA dredging days Oct 200821 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 200822 Dredging of contaminated materials Environmental Sweep Dredger vs Environmental Disc Cutter

23 Sepetiba dredging and reclamation works CEDA dredging days Oct 200823 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 200824 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 200825


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