In the Unterems from km 0.0 to 40.7 and the Leda from km 22.9 to 24.8, approximately 2.35 million m³ of soil are expected to be dredged, conveyed and washed/dumped from June 2023 to October 2024.
Furthermore, temporary transshipment stations must be set up.
The construction works to be carried out are dredging work to maintain and restore the required depths and widths in the Unterems and Leda.
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In the course of the temporary adaptation of the Unterems for deep-going ships (depth of demand), dredging campaigns must be carried out in the dredging area from Papenburg to Emden in the years 2023 to 2024. For this purpose, it is necessary to dredge, extract (transport) soil from Ems-km 0.0 to Ems-km 40.7 including the existing berths along the route using the dredging method and to wash it into the deposit areas lying inland (section 3.2.5 of the building specification) (approx. 2.25 million m³) or to dump it onto the deposit areas in the Ems (river course and estuary) (approx. 0.10 million m³).
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The contractor (contractor) must set up a temporary transshipment station including a line to the shore at Ems-km 6.4 and connect it to the existing line of the client (AG). During the dredging campaigns, this transshipment station, including the connecting device, must be moved to Leda-km 22.9 (for flushing Breinermoor) and Ems-km 13.75 (for flushing to Kloster Muhde) and connected to an existing flushing pipe (float) line DN 500. It can be assumed that a total of 7 transfer operations will have to be carried out within the term of the contract.
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At Ems-km 42.2, the Contractor shall set up a temporary transshipment station including an approx. 75 m long floating pipeline (DN 600) to the shore and connect it to an existing pipeline (DN 600)
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At Ems-km 45.1, the Contractor must set up a temporary transshipment station including an approx. 200 m long culvert pipeline (DN 600) to the shore and connect it to an existing pipeline (DN 600). The culvert line must be secured in such a way that distribution is prevented by tidal currents, storms, ice, etc.
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The Contractor shall use the aforementioned temporary transshipment stations as well as the stationary transshipment stations provided by the Client at Ems-km 7.1 and Ems-km 22.1 and ensure flushing operation.
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The soil to be dredged in the Unterems and Leda currently consists of approx. 90% silt and approx. 10% sand. The consistency of the silt is predominantly "mushy" to "soft". However, due to changes in headwater discharges (inflow from the Oberems), soil types and quantities can change considerably. Especially in the area from Ems-km 0.0 to Ems-km 4.0 and Ems-km 20 to Ems-km 40.7, sandy soil or soil with increased sand content is to be expected in places (see also Chapter 2.6). This must be taken into account when designing the flushing operation.
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The dredging work to create the depth of demand in the Unterems and Leda is carried out in three campaigns. For more information, please refer to the building specification.