1. Preparing a long term management plan for the future of the Slufter An analysis of the functional, spatial and geotechnical possibilities Roderik Heerema, MSc Wednesday October 24, 2012

2. Content Introduction The Port of Rotterdam Contaminated dredged material management in the Netherlands The Slufter Conclusions

3. Introduction

4. DEME Introduction

8. The Port of Rotterdam

10. Every year: – €500 Million Turnover – 430 million tons of goods throughput – 34,000 ocean going vessels and 100,000 inland vessels – Third largest port in the world Expanding…

11. The Port of Rotterdam Maasvlakte 2

12. Contaminated dredged material management in the Netherlands 3 to 5 million cubic meters of contaminated material dredged yearly Several facilities… Total remaining storage capacity 85 million cubic meters Enough for the next 32 years Hollandsch Diep Ijseloog The Slufter

13. The Slufter | CDF Large scale Confined Disposal Facility Built in 1987 Storage of contaminated dredged material

14. The Slufter | Location

16. The Slufter | Dimensions 6km 2km 260ha 3.7 miles 1.2 miles 642 acres

17. The Slufter | Dimensions NAP +24m NAP +6m NAP +2m NAP -28m Dredged material NAP 52m 30m Total capacity 150 million m 3 171 ft98 ft196 yd³

18. The Slufter | History Why it was built The “Rhine Research Project” The Slufter through the years…

19. The Slufter | History

20. The Slufter | Today The Slufter is increasingly losing its function Reduced supply of contaminated dredged material – Expected lifetime in 1987 was 15 years – More than 24 years later only 50% has been filled Overcapacity Surplus of space which is not ready for use

21. The Slufter | Functions

23. The Slufter Building on dredged material – Clay and silt particles – Very low bearing capacity Dredged material Retaining structure New land Remaining storage capacity A Geotechnical Challenge

24. The Slufter A Geotechnical Challenge

25. The Slufter 1:10 400m A Geotechnical Challenge

26. The Slufter A Geotechnical Challenge

27. The Slufter A Geotechnical Challenge

28. The Slufter The principle of dry storage 1.Remove water sheet and lower ground water level 2.Initiate a process of ripening dredged material 3.Obtain a layer with sufficient bearing capacity Ripened dredged material Dredged material A Geotechnical Challenge

29. The Slufter A Geotechnical Challenge

30. The Slufter | Solution A long term approach – Use the incoming supply of dredged material as elevation material – Elevate until the layer has sufficient bearing capacity and develop from thereon – Lower the ring-dike – Move towards a phased dismantlement of the Slufter

31. 30ha 2017 2022 2032 60ha 120ha

32. Conclusions Accept the current situation! Initiate dry storage! Use the space! Create value!

33. Questions?